~evanj/cms

37b75b6fd4e482657f38cb98668b78df49c66971 — Evan M Jones 6 months ago 4aa45cc cache-test
TEST(cache): Attempting to cache at controller level.
48 files changed, 7211 insertions(+), 124 deletions(-)

M cms.go
M go.mod
M go.sum
M internal/c/c.go
M internal/c/content/content.go
M internal/c/contenttype/contenttype.go
M internal/c/ping/ping.go
M internal/c/space/space.go
M internal/c/user/user.go
M internal/m/content/content.go
M internal/m/contenttype/contenttype.go
M internal/m/space/space.go
M internal/m/user/user.go
A internal/s/cache/cache.go
A internal/s/cache/cache_test.go
M internal/s/db/content.go
M internal/s/db/contenttype.go
M internal/s/db/space.go
M internal/s/db/user.go
A vendor/github.com/go-sql-driver/mysql/.gitignore
A vendor/github.com/go-sql-driver/mysql/.travis.yml
A vendor/github.com/go-sql-driver/mysql/AUTHORS
A vendor/github.com/go-sql-driver/mysql/CHANGELOG.md
A vendor/github.com/go-sql-driver/mysql/LICENSE
A vendor/github.com/go-sql-driver/mysql/README.md
A vendor/github.com/go-sql-driver/mysql/auth.go
A vendor/github.com/go-sql-driver/mysql/buffer.go
A vendor/github.com/go-sql-driver/mysql/collations.go
A vendor/github.com/go-sql-driver/mysql/conncheck.go
A vendor/github.com/go-sql-driver/mysql/conncheck_dummy.go
A vendor/github.com/go-sql-driver/mysql/connection.go
A vendor/github.com/go-sql-driver/mysql/connector.go
A vendor/github.com/go-sql-driver/mysql/const.go
A vendor/github.com/go-sql-driver/mysql/driver.go
A vendor/github.com/go-sql-driver/mysql/dsn.go
A vendor/github.com/go-sql-driver/mysql/errors.go
A vendor/github.com/go-sql-driver/mysql/fields.go
A vendor/github.com/go-sql-driver/mysql/go.mod
A vendor/github.com/go-sql-driver/mysql/infile.go
A vendor/github.com/go-sql-driver/mysql/nulltime.go
A vendor/github.com/go-sql-driver/mysql/nulltime_go113.go
A vendor/github.com/go-sql-driver/mysql/nulltime_legacy.go
A vendor/github.com/go-sql-driver/mysql/packets.go
A vendor/github.com/go-sql-driver/mysql/result.go
A vendor/github.com/go-sql-driver/mysql/rows.go
A vendor/github.com/go-sql-driver/mysql/statement.go
A vendor/github.com/go-sql-driver/mysql/transaction.go
A vendor/github.com/go-sql-driver/mysql/utils.go
M cms.go => cms.go +22 -0
@@ 7,11 7,13 @@ import (
	"os"
	"strings"

	"git.sr.ht/~evanj/cms/internal/c"
	"git.sr.ht/~evanj/cms/internal/c/content"
	"git.sr.ht/~evanj/cms/internal/c/contenttype"
	"git.sr.ht/~evanj/cms/internal/c/ping"
	"git.sr.ht/~evanj/cms/internal/c/space"
	"git.sr.ht/~evanj/cms/internal/c/user"
	"git.sr.ht/~evanj/cms/internal/s/cache"
	"git.sr.ht/~evanj/cms/internal/s/db"
	"git.sr.ht/~evanj/cms/pkg/e3"
	"git.sr.ht/~evanj/security"


@@ 83,33 85,53 @@ func init() {
		applogger.Fatal(err)
	}

	cacher, err := cache.New(
		log.New(w, "[cms:cache] ", 0),
		os.Getenv("MEMCACHE_KEY"),
		os.Getenv("MEMCACHE_SERVER"),
	)
	if err != nil {
		applogger.Fatal(err)
	}

	fs := e3.New(
		os.Getenv("E3_USER"),
		os.Getenv("E3_PASS"),
		os.Getenv("E3_URL"),
	)

	captain := c.New(
		log.New(w, "[cms:captain] ", 0),
		db,
		cacher,
	)

	app = &App{
		log: applogger,
		content: content.New(
			captain,
			log.New(w, "[cms:content] ", 0),
			db,
			fs,
		),
		contenttype: contenttype.New(
			captain,
			log.New(w, "[cms:contenttype] ", 0),
			db,
		),
		space: space.New(
			captain,
			log.New(w, "[cms:space] ", 0),
			db,
		),
		user: user.New(
			captain,
			log.New(w, "[cms:user] ", 0),
			db,
			os.Getenv("SIGNUP_ENABLE") == "true",
		),
		ping: ping.New(
			captain,
			log.New(w, "[cms:ping] ", 0),
			db,
		),

M go.mod => go.mod +1 -0
@@ 4,6 4,7 @@ go 1.12

require (
	git.sr.ht/~evanj/security v0.0.0-20200228044358-9b9bc6682997
	github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b
	github.com/go-playground/assert/v2 v2.0.1
	github.com/go-sql-driver/mysql v1.5.0
)

M go.sum => go.sum +2 -0
@@ 2,6 2,8 @@ git.sr.ht/~evanj/security v0.0.0-20200228044358-9b9bc6682997 h1:fdAj8fR4mpS/OAve
git.sr.ht/~evanj/security v0.0.0-20200228044358-9b9bc6682997/go.mod h1:40791KVgThT97CT6mTsF4NUNPeX2BAVlsuH1RiiSrAs=
github.com/Pallinder/go-randomdata v1.2.0 h1:DZ41wBchNRb/0GfsePLiSwb0PHZmT67XY00lCDlaYPg=
github.com/Pallinder/go-randomdata v1.2.0/go.mod h1:yHmJgulpD2Nfrm0cR9tI/+oAgRqCQQixsA8HyRZfV9Y=
github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b h1:L/QXpzIa3pOvUGt1D1lA5KjYhPBAN/3iWdP7xeFS9F0=
github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b/go.mod h1:H0wQNHz2YrLsuXOZozoeDmnHXkNCRmMW0gwFWDfEZDA=
github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
github.com/go-playground/assert/v2 v2.0.1 h1:MsBgLAaY856+nPRTKrp3/OZK38U/wa0CcBYNjji3q3A=

M internal/c/c.go => internal/c/c.go +89 -19
@@ 5,7 5,6 @@ import (
	"encoding/json"
	"fmt"
	"html/template"
	"io"
	"log"
	"net/http"
	"strings"


@@ 18,8 17,9 @@ type KeyCookie = string
var KeyUserLogin KeyCookie = "KeyUserLogin"

type Controller struct {
	log *log.Logger
	db  dber
	log   *log.Logger
	db    dber
	cache cacher
}

type dber interface {


@@ 27,10 27,11 @@ type dber interface {
	UserGetFromToken(token string) (user.User, error)
}

func New(log *log.Logger, db dber) *Controller {
func New(log *log.Logger, db dber, cache cacher) *Controller {
	return &Controller{
		log,
		db,
		cache,
	}
}



@@ 96,9 97,11 @@ func (c *Controller) Error(w http.ResponseWriter, r *http.Request, code int, str
}

// TODO: You know why this is bad, change it.
func (c *Controller) HTML(w http.ResponseWriter, r *http.Request, tmpl *template.Template, data interface{}) {
	// HTML response.
func (c *Controller) HTML(w http.ResponseWriter, r *http.Request, tmpl *template.Template, data interface{}, cacheKeys ...string) {
	var cache cacheItem

	if strings.Contains(r.Header.Get("Accept"), "text/html") {
		// HTML response.
		buf := bytes.Buffer{}
		if err := tmpl.Execute(&buf, data); err != nil {
			c.log.Println(err)


@@ 106,21 109,88 @@ func (c *Controller) HTML(w http.ResponseWriter, r *http.Request, tmpl *template
			return
		}

		w.WriteHeader(http.StatusOK)
		w.Header().Add("Content-Type", "text/html")
		io.Copy(w, &buf)
		return
		cache = cacheItem{
			http.StatusOK,
			"text/html",
			buf.Bytes(),
		}

		// w.WriteHeader(http.StatusOK)
		// w.Header().Add("Content-Type", "text/html")
		// io.Copy(w, &buf)
	} else {
		// JSON response.
		bytes, err := json.Marshal(data)
		if err != nil {
			c.log.Println(err)
			c.Error(w, r, http.StatusInternalServerError, "failed to build json response")
			return
		}

		cache = cacheItem{
			http.StatusOK,
			"application/json",
			bytes,
		}

		// w.WriteHeader(http.StatusOK)
		// w.Header().Add("Content-Type", "application/json")
		// w.Write(bytes)
	}

	// JSON response.
	bytes, err := json.Marshal(data)
	if err != nil {
		c.log.Println(err)
		c.Error(w, r, http.StatusInternalServerError, "failed to build json response")
		return
	w.WriteHeader(cache.StatusCode)
	w.Header().Add("Content-Type", cache.ContentType)
	w.Write(cache.Body)

	if len(cacheKeys) > 0 {
		cacheKeys = append(cacheKeys, cache.ContentType)
		key := c.cache.Key(cacheKeys...)
		if err := c.cache.Set(key, cache); err != nil {
			c.log.Println("failed to save cache", err)
		}
	}
}

	w.WriteHeader(http.StatusOK)
	w.Header().Add("Content-Type", "application/json")
	w.Write(bytes)
// Cache things.

type cacher interface {
	Key(...string) string
	Get(string, interface{}) error
	Set(string, interface{}) error
	Del(string) error
}

type cacheItem struct {
	StatusCode  int
	ContentType string
	Body        []byte
}

func (c *Controller) CacheTry(w http.ResponseWriter, r *http.Request, things ...string) (successful bool) {
	contentType := "application/json"
	if strings.Contains(r.Header.Get("Accept"), "text/html") {
		contentType = "text/html"
	}

	things = append(things, contentType)
	key := c.cache.Key(things...)

	var item cacheItem
	if err := c.cache.Get(key, &item); err != nil {
		return false
	}

	w.WriteHeader(item.StatusCode)
	w.Header().Add("Content-Type", item.ContentType)
	w.Write(item.Body)

	return true
}

func (c *Controller) CacheBreak(w http.ResponseWriter, r *http.Request, things ...string) {
	key := c.cache.Key(things...)
	err := c.cache.Del(key)
	if err != nil {
		c.log.Println("failed to remove cache for", key)
	}
}

M internal/c/content/content.go => internal/c/content/content.go +11 -4
@@ 45,9 45,9 @@ type e3er interface {
	Upload(ctx context.Context, public bool, filename string, file io.Reader) (string, error)
}

func New(log *log.Logger, db dber, e3 e3er) *Content {
func New(captain *c.Controller, log *log.Logger, db dber, e3 e3er) *Content {
	return &Content{
		c.New(log, db),
		captain,
		log,
		db,
		e3,


@@ 175,6 175,11 @@ func (c *Content) serve(w http.ResponseWriter, r *http.Request, spaceID, content
		return
	}

	if c.CacheTry(w, r, user.ID(), spaceID, contenttypeID, contentID) {
		c.log.Println("content serve cache successful")
		return
	}

	space, err := c.db.SpaceGet(user, spaceID)
	if err != nil {
		c.Error(w, r, http.StatusInternalServerError, "failed to find required space")


@@ 194,12 199,14 @@ func (c *Content) serve(w http.ResponseWriter, r *http.Request, spaceID, content
		return
	}

	c.HTML(w, r, contentHTML, map[string]interface{}{
	data := map[string]interface{}{
		"User":        user,
		"Space":       space,
		"ContentType": ct,
		"Content":     content,
	})
	}

	c.HTML(w, r, contentHTML, data, user.ID(), spaceID, contenttypeID, contentID)
}

func (c *Content) update(w http.ResponseWriter, r *http.Request) {

M internal/c/contenttype/contenttype.go => internal/c/contenttype/contenttype.go +2 -2
@@ 35,9 35,9 @@ type dber interface {
	ContentPerContentType(space space.Space, ct contenttype.ContentType, page int) ([]content.Content, error)
}

func New(log *log.Logger, db dber) *ContentType {
func New(captain *c.Controller, log *log.Logger, db dber) *ContentType {
	return &ContentType{
		c.New(log, db),
		captain,
		log,
		db,
	}

M internal/c/ping/ping.go => internal/c/ping/ping.go +2 -2
@@ 18,9 18,9 @@ type dber interface {
	UserGetFromToken(token string) (user.User, error)
}

func New(log *log.Logger, db dber) *Ping {
func New(captain *c.Controller, log *log.Logger, db dber) *Ping {
	return &Ping{
		c.New(log, db),
		captain,
		log,
	}
}

M internal/c/space/space.go => internal/c/space/space.go +2 -2
@@ 32,9 32,9 @@ type dber interface {
	ContentTypesPerSpace(space space.Space, page int) ([]contenttype.ContentType, error)
}

func New(log *log.Logger, db dber) *Space {
func New(captain *c.Controller, log *log.Logger, db dber) *Space {
	return &Space{
		c.New(log, db),
		captain,
		log,
		db,
	}

M internal/c/user/user.go => internal/c/user/user.go +2 -2
@@ 29,9 29,9 @@ type dber interface {
	SpacesPerUser(user user.User, page int) ([]space.Space, error)
}

func New(log *log.Logger, db dber, signupEnabled bool) *User {
func New(captain *c.Controller, log *log.Logger, db dber, signupEnabled bool) *User {
	return &User{
		c.New(log, db),
		captain,
		log,
		db,
		signupEnabled,

M internal/m/content/content.go => internal/m/content/content.go +0 -3
@@ 1,14 1,11 @@
package content

import (
	"encoding/json"

	"git.sr.ht/~evanj/cms/internal/m/contenttype"
	"git.sr.ht/~evanj/cms/internal/m/value"
)

type Content interface {
	json.Marshaler
	ID() string
	Type() contenttype.ContentType
	Values() []value.Value

M internal/m/contenttype/contenttype.go => internal/m/contenttype/contenttype.go +0 -3
@@ 1,13 1,10 @@
package contenttype

import (
	"encoding/json"

	"git.sr.ht/~evanj/cms/internal/m/valuetype"
)

type ContentType interface {
	json.Marshaler
	ID() string
	Name() string
	Fields() []valuetype.ValueType

M internal/m/space/space.go => internal/m/space/space.go +0 -3
@@ 1,9 1,6 @@
package space

import "encoding/json"

type Space interface {
	json.Marshaler
	ID() string
	Name() string
	Desc() string

M internal/m/user/user.go => internal/m/user/user.go +0 -3
@@ 1,9 1,6 @@
package user

import "encoding/json"

type User interface {
	json.Marshaler
	ID() string
	Name() string
	Token() string

A internal/s/cache/cache.go => internal/s/cache/cache.go +48 -0
@@ 0,0 1,48 @@
package cache

import (
	"encoding/json"
	"fmt"
	"log"

	"github.com/bradfitz/gomemcache/memcache"
)

type Cache struct {
	log     *log.Logger
	baseKey string
	mc      *memcache.Client
}

func New(log *log.Logger, key string, memcacheServer string) (*Cache, error) {
	c := &Cache{log, key, memcache.New(memcacheServer)}
	return c, c.mc.Ping()
}

func (c *Cache) Key(things ...string) string {
	key := fmt.Sprintf("%s", c.baseKey)
	for _, thing := range things {
		key = fmt.Sprintf("%s::%s", key, thing)
	}
	return key
}

func (c *Cache) Get(key string, item interface{}) error {
	thing, err := c.mc.Get(key)
	if err != nil {
		return err
	}
	return json.Unmarshal(thing.Value, item)
}

func (c *Cache) Set(key string, thing interface{}) error {
	bytes, err := json.Marshal(thing)
	if err != nil {
		return err
	}
	return c.mc.Set(&memcache.Item{Key: key, Value: bytes})
}

func (c *Cache) Del(key string) error {
	return c.mc.Delete(key)
}

A internal/s/cache/cache_test.go => internal/s/cache/cache_test.go +1 -0
@@ 0,0 1,1 @@
package cache_test

M internal/s/db/content.go => internal/s/db/content.go +46 -50
@@ 1,7 1,6 @@
package db

import (
	"encoding/json"
	"fmt"

	"git.sr.ht/~evanj/cms/internal/m/content"


@@ 11,10 10,17 @@ import (
	"git.sr.ht/~evanj/cms/internal/m/valuetype"
)

// TODO: impl. transactions:
// https://stackoverflow.com/questions/27741185/idiomatic-way-to-do-multiple-queries-in-golang-in-one-transaction

// Fields are prefixed with `The` to match interfaces + for JSON
// input/output.

type Content struct {
	// In DB
	id            string
	contenttypeID string

	contenttypeid string
	// Assigned
	contenttype contenttype.ContentType
	values      []ContentValue
}


@@ 26,27 32,19 @@ type ContentValue struct {
	value string // "My First Blog Post!"
}

const (
var (
	queryContentNew = `
		INSERT INTO cms_content (CONTENTTYPE_ID) 
		VALUES (?);
	`

	queryContentDelete = `
		-- Delete joined values.
		DELETE FROM cms_value_string_small 
		WHERE ID IN ( SELECT ID FROM cms_value WHERE CONTENT_ID = ? );
		DELETE FROM cms_value_string_big
		WHERE ID IN ( SELECT ID FROM cms_value WHERE CONTENT_ID = ? );
		DELETE FROM cms_value_date
		WHERE ID IN ( SELECT ID FROM cms_value WHERE CONTENT_ID = ? );
		-- Delete attached values.
		DELETE FROM cms_value
		WHERE CONTENT_ID = ?;
		-- Delete content itself.
		DELETE FROM cms_content 
		WHERE ID = ?;
	`
	queryContentDelete = []string{
		"DELETE FROM cms_value_string_small WHERE ID IN ( SELECT VALUE_ID FROM cms_value WHERE CONTENT_ID = ? );",
		"DELETE FROM cms_value_string_big WHERE ID IN ( SELECT VALUE_ID FROM cms_value WHERE CONTENT_ID = ? );",
		"DELETE FROM cms_value_date WHERE ID IN ( SELECT VALUE_ID FROM cms_value WHERE CONTENT_ID = ? );",
		"DELETE FROM cms_value WHERE CONTENT_ID = ?;",
		"DELETE FROM cms_content WHERE ID = ?;",
	}

	queryContentGetByID = `
		SELECT ID, CONTENTTYPE_ID 


@@ 83,23 81,23 @@ const (
	queryValueUpdateStringSmall = `
		UPDATE cms_value_string_small
		SET value = ?
		WHERE cms_value_string_small.ID IN ( SELECT VALUE_ID FROM cms_value WHERE cms_value.ID = ? );
		WHERE cms_value_string_small.ID IN ( SELECT VALUE_ID FROM cms_value WHERE cms_value.id = ? );
	`

	queryValueUpdateStringBig = `
		UPDATE cms_value_string_big
		SET value = ?
		WHERE cms_value_string_big.ID IN ( SELECT VALUE_ID FROM cms_value WHERE cms_value.ID = ? );
		WHERE cms_value_string_big.ID IN ( SELECT VALUE_ID FROM cms_value WHERE cms_value.id = ? );
	`

	queryValueUpdateDate = `
		UPDATE cms_value_date
		SET value = ?
		WHERE cms_value_date.ID IN ( SELECT VALUE_ID FROM cms_value WHERE cms_value.ID = ? );
		WHERE cms_value_date.ID IN ( SELECT VALUE_ID FROM cms_value WHERE cms_value.id = ? );
	`

	queryValueGetStringSmallByID = `
		SELECT cms_value.ID as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_string_small.VALUE
		SELECT cms_value.id as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_string_small.VALUE
		FROM cms_value
		JOIN cms_contenttype_to_valuetype
		ON cms_contenttype_to_valuetype.ID = cms_value.CONTENTTYPE_TO_VALUETYPE_ID


@@ 107,11 105,11 @@ const (
		ON cms_valuetype.ID = cms_contenttype_to_valuetype.VALUETYPE_ID
		JOIN cms_value_string_small
		ON cms_value_string_small.ID = cms_value.VALUE_ID
		WHERE cms_value.ID = ?;
		WHERE cms_value.id = ?;
	`

	queryValueGetStringBigByID = `
		SELECT cms_value.ID as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_string_big.VALUE
		SELECT cms_value.id as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_string_big.VALUE
		FROM cms_value
		JOIN cms_contenttype_to_valuetype
		ON cms_contenttype_to_valuetype.ID = cms_value.CONTENTTYPE_TO_VALUETYPE_ID


@@ 119,11 117,11 @@ const (
		ON cms_valuetype.ID = cms_contenttype_to_valuetype.VALUETYPE_ID
		JOIN cms_value_string_big
		ON cms_value_string_big.ID = cms_value.VALUE_ID
		WHERE cms_value.ID = ?;
		WHERE cms_value.id = ?;
	`

	queryValueGetDateByID = `
		SELECT cms_value.ID as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_date.VALUE
		SELECT cms_value.id as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_date.VALUE
		FROM cms_value
		JOIN cms_contenttype_to_valuetype
		ON cms_contenttype_to_valuetype.ID = cms_value.CONTENTTYPE_TO_VALUETYPE_ID


@@ 131,13 129,13 @@ const (
		ON cms_valuetype.ID = cms_contenttype_to_valuetype.VALUETYPE_ID
		JOIN cms_value_date
		ON cms_value_date.ID = cms_value.VALUE_ID
		WHERE cms_value.ID = ?;
		WHERE cms_value.id = ?;
	`

	queryValueListByContent = `
		SELECT ID, TYPE, NAME, VALUE FROM (

			SELECT cms_value.ID as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_string_small.VALUE, cms_contenttype_to_valuetype.ID as ORDER_ID
			SELECT cms_value.id as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_string_small.VALUE, cms_contenttype_to_valuetype.ID as ORDER_ID
			FROM cms_value
			JOIN cms_contenttype_to_valuetype
			ON cms_contenttype_to_valuetype.ID = cms_value.CONTENTTYPE_TO_VALUETYPE_ID


@@ 153,7 151,7 @@ const (

			UNION

			SELECT cms_value.ID as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_date.VALUE, cms_contenttype_to_valuetype.ID as ORDER_ID
			SELECT cms_value.id as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_date.VALUE, cms_contenttype_to_valuetype.ID as ORDER_ID
			FROM cms_value
			JOIN cms_contenttype_to_valuetype
			ON cms_contenttype_to_valuetype.ID = cms_value.CONTENTTYPE_TO_VALUETYPE_ID


@@ 168,7 166,7 @@ const (
			
			UNION

			SELECT cms_value.ID as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_string_big.VALUE, cms_contenttype_to_valuetype.ID as ORDER_ID
			SELECT cms_value.id as ID, cms_valuetype.VALUE as TYPE, cms_contenttype_to_valuetype.NAME, cms_value_string_big.VALUE, cms_contenttype_to_valuetype.ID as ORDER_ID
			FROM cms_value
			JOIN cms_contenttype_to_valuetype
			ON cms_contenttype_to_valuetype.ID = cms_value.CONTENTTYPE_TO_VALUETYPE_ID


@@ 209,7 207,7 @@ func (db *DB) ContentNew(space space.Space, ct contenttype.ContentType, params [
	}

	var content Content
	if err := db.QueryRow(queryContentGetByID, contentID).Scan(&content.id, &content.contenttypeID); err != nil {
	if err := db.QueryRow(queryContentGetByID, contentID).Scan(&content.id, &content.contenttypeid); err != nil {
		db.log.Println("db.QueryRow", err)
		return nil, fmt.Errorf("failed to find content created")
	}


@@ 283,9 281,20 @@ func (db *DB) ContentUpdate(space space.Space, ct contenttype.ContentType, conte
}

func (db *DB) ContentDelete(space space.Space, ct contenttype.ContentType, content content.Content) error {
	id := content.ID()
	_, err := db.Exec(queryContentDelete, id, id, id, id, id)
	return err
	t, err := db.Begin()
	if err != nil {
		return err
	}
	defer t.Rollback()

	for _, del := range queryContentDelete {
		_, err := db.Exec(del, content.ID())
		if err != nil {
			return err
		}
	}

	return t.Commit()
}

func (db *DB) ContentPerContentType(space space.Space, ct contenttype.ContentType, page int) ([]content.Content, error) {


@@ 298,7 307,7 @@ func (db *DB) ContentPerContentType(space space.Space, ct contenttype.ContentTyp

	for rows.Next() {
		var content Content
		if err := rows.Scan(&content.id, &content.contenttypeID); err != nil {
		if err := rows.Scan(&content.id, &content.contenttypeid); err != nil {
			return nil, err
		}



@@ 324,7 333,7 @@ func (db *DB) ContentPerContentType(space space.Space, ct contenttype.ContentTyp

func (db *DB) ContentGet(space space.Space, ct contenttype.ContentType, contentID string) (content.Content, error) {
	var content Content
	if err := db.QueryRow(queryContentGetByID, contentID).Scan(&content.id, &content.contenttypeID); err != nil {
	if err := db.QueryRow(queryContentGetByID, contentID).Scan(&content.id, &content.contenttypeid); err != nil {
		db.log.Println("db.QueryRow", err)
		return nil, fmt.Errorf("failed to find space")
	}


@@ 408,19 417,6 @@ func (c *Content) MustValueByName(name string) (ret value.Value) {
	return
}

func (c *Content) MarshalJSON() ([]byte, error) {
	fields := make(map[string]string)
	for _, item := range c.Values() {
		fields[item.Name()] = item.Value()
	}

	values := make(map[string]interface{})
	values["id"] = c.ID()
	values["fields"] = fields

	return json.Marshal(values)
}

func (c *ContentValue) ID() string {
	return c.id
}

M internal/s/db/contenttype.go => internal/s/db/contenttype.go +0 -14
@@ 1,7 1,6 @@
package db

import (
	"encoding/json"
	"fmt"

	"git.sr.ht/~evanj/cms/internal/m/contenttype"


@@ 160,19 159,6 @@ func (ct *ContentType) Fields() []valuetype.ValueType {
	return ret
}

func (c *ContentType) MarshalJSON() ([]byte, error) {
	fields := make(map[string]string)
	for _, item := range c.Fields() {
		fields[item.Name()] = item.Type()
	}

	values := make(map[string]interface{})
	values["id"] = c.ID()
	values["fields"] = fields

	return json.Marshal(values)
}

func (f *ContentTypeField) ID() string {
	return f.id
}

M internal/s/db/space.go => internal/s/db/space.go +0 -9
@@ 1,7 1,6 @@
package db

import (
	"encoding/json"
	"fmt"

	"git.sr.ht/~evanj/cms/internal/m/space"


@@ 101,11 100,3 @@ func (s *Space) Name() string {
func (s *Space) Desc() string {
	return s.desc
}

func (c *Space) MarshalJSON() ([]byte, error) {
	values := make(map[string]string)
	values["id"] = c.ID()
	values["name"] = c.Name()
	values["desc"] = c.Desc()
	return json.Marshal(values)
}

M internal/s/db/user.go => internal/s/db/user.go +0 -8
@@ 1,7 1,6 @@
package db

import (
	"encoding/json"
	"fmt"

	"git.sr.ht/~evanj/cms/internal/m/user"


@@ 124,10 123,3 @@ func (u *User) Name() string {
func (u *User) Token() string {
	return u.token
}

func (u *User) MarshalJSON() ([]byte, error) {
	values := make(map[string]string)
	values["id"] = u.ID()
	values["name"] = u.Name()
	return json.Marshal(values)
}

A vendor/github.com/go-sql-driver/mysql/.gitignore => vendor/github.com/go-sql-driver/mysql/.gitignore +9 -0
@@ 0,0 1,9 @@
.DS_Store
.DS_Store?
._*
.Spotlight-V100
.Trashes
Icon?
ehthumbs.db
Thumbs.db
.idea

A vendor/github.com/go-sql-driver/mysql/.travis.yml => vendor/github.com/go-sql-driver/mysql/.travis.yml +129 -0
@@ 0,0 1,129 @@
sudo: false
language: go
go:
  - 1.10.x
  - 1.11.x
  - 1.12.x
  - 1.13.x
  - master

before_install:
  - go get golang.org/x/tools/cmd/cover
  - go get github.com/mattn/goveralls

before_script:
  - echo -e "[server]\ninnodb_log_file_size=256MB\ninnodb_buffer_pool_size=512MB\nmax_allowed_packet=16MB" | sudo tee -a /etc/mysql/my.cnf
  - sudo service mysql restart
  - .travis/wait_mysql.sh
  - mysql -e 'create database gotest;'

matrix:
  include:
    - env: DB=MYSQL8
      sudo: required
      dist: trusty
      go: 1.10.x
      services:
        - docker
      before_install:
        - go get golang.org/x/tools/cmd/cover
        - go get github.com/mattn/goveralls
        - docker pull mysql:8.0
        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
          mysql:8.0 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
        - cp .travis/docker.cnf ~/.my.cnf
        - .travis/wait_mysql.sh
      before_script:
        - export MYSQL_TEST_USER=gotest
        - export MYSQL_TEST_PASS=secret
        - export MYSQL_TEST_ADDR=127.0.0.1:3307
        - export MYSQL_TEST_CONCURRENT=1

    - env: DB=MYSQL57
      sudo: required
      dist: trusty
      go: 1.10.x
      services:
        - docker
      before_install:
        - go get golang.org/x/tools/cmd/cover
        - go get github.com/mattn/goveralls
        - docker pull mysql:5.7
        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
          mysql:5.7 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
        - cp .travis/docker.cnf ~/.my.cnf
        - .travis/wait_mysql.sh
      before_script:
        - export MYSQL_TEST_USER=gotest
        - export MYSQL_TEST_PASS=secret
        - export MYSQL_TEST_ADDR=127.0.0.1:3307
        - export MYSQL_TEST_CONCURRENT=1

    - env: DB=MARIA55
      sudo: required
      dist: trusty
      go: 1.10.x
      services:
        - docker
      before_install:
        - go get golang.org/x/tools/cmd/cover
        - go get github.com/mattn/goveralls
        - docker pull mariadb:5.5
        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
          mariadb:5.5 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
        - cp .travis/docker.cnf ~/.my.cnf
        - .travis/wait_mysql.sh
      before_script:
        - export MYSQL_TEST_USER=gotest
        - export MYSQL_TEST_PASS=secret
        - export MYSQL_TEST_ADDR=127.0.0.1:3307
        - export MYSQL_TEST_CONCURRENT=1

    - env: DB=MARIA10_1
      sudo: required
      dist: trusty
      go: 1.10.x
      services:
        - docker
      before_install:
        - go get golang.org/x/tools/cmd/cover
        - go get github.com/mattn/goveralls
        - docker pull mariadb:10.1
        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
          mariadb:10.1 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
        - cp .travis/docker.cnf ~/.my.cnf
        - .travis/wait_mysql.sh
      before_script:
        - export MYSQL_TEST_USER=gotest
        - export MYSQL_TEST_PASS=secret
        - export MYSQL_TEST_ADDR=127.0.0.1:3307
        - export MYSQL_TEST_CONCURRENT=1

    - os: osx
      osx_image: xcode10.1
      addons:
        homebrew:
          packages:
            - mysql
          update: true
      go: 1.12.x
      before_install:
        - go get golang.org/x/tools/cmd/cover
        - go get github.com/mattn/goveralls
      before_script:
        - echo -e "[server]\ninnodb_log_file_size=256MB\ninnodb_buffer_pool_size=512MB\nmax_allowed_packet=16MB\nlocal_infile=1" >> /usr/local/etc/my.cnf
        - mysql.server start
        - mysql -uroot -e 'CREATE USER gotest IDENTIFIED BY "secret"'
        - mysql -uroot -e 'GRANT ALL ON *.* TO gotest'
        - mysql -uroot -e 'create database gotest;'
        - export MYSQL_TEST_USER=gotest
        - export MYSQL_TEST_PASS=secret
        - export MYSQL_TEST_ADDR=127.0.0.1:3306
        - export MYSQL_TEST_CONCURRENT=1

script:
  - go test -v -covermode=count -coverprofile=coverage.out
  - go vet ./...
  - .travis/gofmt.sh
after_script:
  - $HOME/gopath/bin/goveralls -coverprofile=coverage.out -service=travis-ci

A vendor/github.com/go-sql-driver/mysql/AUTHORS => vendor/github.com/go-sql-driver/mysql/AUTHORS +105 -0
@@ 0,0 1,105 @@
# This is the official list of Go-MySQL-Driver authors for copyright purposes.

# If you are submitting a patch, please add your name or the name of the
# organization which holds the copyright to this list in alphabetical order.

# Names should be added to this file as
#	Name <email address>
# The email address is not required for organizations.
# Please keep the list sorted.


# Individual Persons

Aaron Hopkins <go-sql-driver at die.net>
Achille Roussel <achille.roussel at gmail.com>
Alexey Palazhchenko <alexey.palazhchenko at gmail.com>
Andrew Reid <andrew.reid at tixtrack.com>
Arne Hormann <arnehormann at gmail.com>
Asta Xie <xiemengjun at gmail.com>
Bulat Gaifullin <gaifullinbf at gmail.com>
Carlos Nieto <jose.carlos at menteslibres.net>
Chris Moos <chris at tech9computers.com>
Craig Wilson <craiggwilson at gmail.com>
Daniel Montoya <dsmontoyam at gmail.com>
Daniel Nichter <nil at codenode.com>
Daniël van Eeden <git at myname.nl>
Dave Protasowski <dprotaso at gmail.com>
DisposaBoy <disposaboy at dby.me>
Egor Smolyakov <egorsmkv at gmail.com>
Erwan Martin <hello at erwan.io>
Evan Shaw <evan at vendhq.com>
Frederick Mayle <frederickmayle at gmail.com>
Gustavo Kristic <gkristic at gmail.com>
Hajime Nakagami <nakagami at gmail.com>
Hanno Braun <mail at hannobraun.com>
Henri Yandell <flamefew at gmail.com>
Hirotaka Yamamoto <ymmt2005 at gmail.com>
Huyiguang <hyg at webterren.com>
ICHINOSE Shogo <shogo82148 at gmail.com>
Ilia Cimpoes <ichimpoesh at gmail.com>
INADA Naoki <songofacandy at gmail.com>
Jacek Szwec <szwec.jacek at gmail.com>
James Harr <james.harr at gmail.com>
Jeff Hodges <jeff at somethingsimilar.com>
Jeffrey Charles <jeffreycharles at gmail.com>
Jerome Meyer <jxmeyer at gmail.com>
Jiajia Zhong <zhong2plus at gmail.com>
Jian Zhen <zhenjl at gmail.com>
Joshua Prunier <joshua.prunier at gmail.com>
Julien Lefevre <julien.lefevr at gmail.com>
Julien Schmidt <go-sql-driver at julienschmidt.com>
Justin Li <jli at j-li.net>
Justin Nuß <nuss.justin at gmail.com>
Kamil Dziedzic <kamil at klecza.pl>
Kevin Malachowski <kevin at chowski.com>
Kieron Woodhouse <kieron.woodhouse at infosum.com>
Lennart Rudolph <lrudolph at hmc.edu>
Leonardo YongUk Kim <dalinaum at gmail.com>
Linh Tran Tuan <linhduonggnu at gmail.com>
Lion Yang <lion at aosc.xyz>
Luca Looz <luca.looz92 at gmail.com>
Lucas Liu <extrafliu at gmail.com>
Luke Scott <luke at webconnex.com>
Maciej Zimnoch <maciej.zimnoch at codilime.com>
Michael Woolnough <michael.woolnough at gmail.com>
Nathanial Murphy <nathanial.murphy at gmail.com>
Nicola Peduzzi <thenikso at gmail.com>
Olivier Mengué <dolmen at cpan.org>
oscarzhao <oscarzhaosl at gmail.com>
Paul Bonser <misterpib at gmail.com>
Peter Schultz <peter.schultz at classmarkets.com>
Rebecca Chin <rchin at pivotal.io>
Reed Allman <rdallman10 at gmail.com>
Richard Wilkes <wilkes at me.com>
Robert Russell <robert at rrbrussell.com>
Runrioter Wung <runrioter at gmail.com>
Shuode Li <elemount at qq.com>
Simon J Mudd <sjmudd at pobox.com>
Soroush Pour <me at soroushjp.com>
Stan Putrya <root.vagner at gmail.com>
Stanley Gunawan <gunawan.stanley at gmail.com>
Steven Hartland <steven.hartland at multiplay.co.uk>
Thomas Wodarek <wodarekwebpage at gmail.com>
Tim Ruffles <timruffles at gmail.com>
Tom Jenkinson <tom at tjenkinson.me>
Vladimir Kovpak <cn007b at gmail.com>
Xiangyu Hu <xiangyu.hu at outlook.com>
Xiaobing Jiang <s7v7nislands at gmail.com>
Xiuming Chen <cc at cxm.cc>
Zhenye Xie <xiezhenye at gmail.com>

# Organizations

Barracuda Networks, Inc.
Counting Ltd.
DigitalOcean Inc.
Facebook Inc.
GitHub Inc.
Google Inc.
InfoSum Ltd.
Keybase Inc.
Multiplay Ltd.
Percona LLC
Pivotal Inc.
Stripe Inc.

A vendor/github.com/go-sql-driver/mysql/CHANGELOG.md => vendor/github.com/go-sql-driver/mysql/CHANGELOG.md +206 -0
@@ 0,0 1,206 @@
## Version 1.5 (2020-01-07)

Changes:

  - Dropped support Go 1.9 and lower (#823, #829, #886, #1016, #1017)
  - Improve buffer handling (#890)
  - Document potentially insecure TLS configs (#901)
  - Use a double-buffering scheme to prevent data races (#943)
  - Pass uint64 values without converting them to string (#838, #955)
  - Update collations and make utf8mb4 default (#877, #1054)
  - Make NullTime compatible with sql.NullTime in Go 1.13+ (#995)
  - Removed CloudSQL support (#993, #1007)
  - Add Go Module support (#1003)

New Features:

  - Implement support of optional TLS (#900)
  - Check connection liveness (#934, #964, #997, #1048, #1051, #1052)
  - Implement Connector Interface (#941, #958, #1020, #1035)

Bugfixes:

  - Mark connections as bad on error during ping (#875)
  - Mark connections as bad on error during dial (#867)
  - Fix connection leak caused by rapid context cancellation (#1024)
  - Mark connections as bad on error during Conn.Prepare (#1030)


## Version 1.4.1 (2018-11-14)

Bugfixes:

 - Fix TIME format for binary columns (#818)
 - Fix handling of empty auth plugin names (#835)
 - Fix caching_sha2_password with empty password (#826)
 - Fix canceled context broke mysqlConn (#862)
 - Fix OldAuthSwitchRequest support (#870)
 - Fix Auth Response packet for cleartext password (#887)

## Version 1.4 (2018-06-03)

Changes:

 - Documentation fixes (#530, #535, #567)
 - Refactoring (#575, #579, #580, #581, #603, #615, #704)
 - Cache column names (#444)
 - Sort the DSN parameters in DSNs generated from a config (#637)
 - Allow native password authentication by default (#644)
 - Use the default port if it is missing in the DSN (#668)
 - Removed the `strict` mode (#676)
 - Do not query `max_allowed_packet` by default (#680)
 - Dropped support Go 1.6 and lower (#696)
 - Updated `ConvertValue()` to match the database/sql/driver implementation (#760)
 - Document the usage of `0000-00-00T00:00:00` as the time.Time zero value (#783)
 - Improved the compatibility of the authentication system (#807)

New Features:

 - Multi-Results support (#537)
 - `rejectReadOnly` DSN option (#604)
 - `context.Context` support (#608, #612, #627, #761)
 - Transaction isolation level support (#619, #744)
 - Read-Only transactions support (#618, #634)
 - `NewConfig` function which initializes a config with default values (#679)
 - Implemented the `ColumnType` interfaces (#667, #724)
 - Support for custom string types in `ConvertValue` (#623)
 - Implemented `NamedValueChecker`, improving support for uint64 with high bit set (#690, #709, #710)
 - `caching_sha2_password` authentication plugin support (#794, #800, #801, #802)
 - Implemented `driver.SessionResetter` (#779)
 - `sha256_password` authentication plugin support (#808)

Bugfixes:

 - Use the DSN hostname as TLS default ServerName if `tls=true` (#564, #718)
 - Fixed LOAD LOCAL DATA INFILE for empty files (#590)
 - Removed columns definition cache since it sometimes cached invalid data (#592)
 - Don't mutate registered TLS configs (#600)
 - Make RegisterTLSConfig concurrency-safe (#613)
 - Handle missing auth data in the handshake packet correctly (#646)
 - Do not retry queries when data was written to avoid data corruption (#302, #736)
 - Cache the connection pointer for error handling before invalidating it (#678)
 - Fixed imports for appengine/cloudsql (#700)
 - Fix sending STMT_LONG_DATA for 0 byte data (#734)
 - Set correct capacity for []bytes read from length-encoded strings (#766)
 - Make RegisterDial concurrency-safe (#773)


## Version 1.3 (2016-12-01)

Changes:

 - Go 1.1 is no longer supported
 - Use decimals fields in MySQL to format time types (#249)
 - Buffer optimizations (#269)
 - TLS ServerName defaults to the host (#283)
 - Refactoring (#400, #410, #437)
 - Adjusted documentation for second generation CloudSQL (#485)
 - Documented DSN system var quoting rules (#502)
 - Made statement.Close() calls idempotent to avoid errors in Go 1.6+ (#512)

New Features:

 - Enable microsecond resolution on TIME, DATETIME and TIMESTAMP (#249)
 - Support for returning table alias on Columns() (#289, #359, #382)
 - Placeholder interpolation, can be actived with the DSN parameter `interpolateParams=true` (#309, #318, #490)
 - Support for uint64 parameters with high bit set (#332, #345)
 - Cleartext authentication plugin support (#327)
 - Exported ParseDSN function and the Config struct (#403, #419, #429)
 - Read / Write timeouts (#401)
 - Support for JSON field type (#414)
 - Support for multi-statements and multi-results (#411, #431)
 - DSN parameter to set the driver-side max_allowed_packet value manually (#489)
 - Native password authentication plugin support (#494, #524)

Bugfixes:

 - Fixed handling of queries without columns and rows (#255)
 - Fixed a panic when SetKeepAlive() failed (#298)
 - Handle ERR packets while reading rows (#321)
 - Fixed reading NULL length-encoded integers in MySQL 5.6+ (#349)
 - Fixed absolute paths support in LOAD LOCAL DATA INFILE (#356)
 - Actually zero out bytes in handshake response (#378)
 - Fixed race condition in registering LOAD DATA INFILE handler (#383)
 - Fixed tests with MySQL 5.7.9+ (#380)
 - QueryUnescape TLS config names (#397)
 - Fixed "broken pipe" error by writing to closed socket (#390)
 - Fixed LOAD LOCAL DATA INFILE buffering (#424)
 - Fixed parsing of floats into float64 when placeholders are used (#434)
 - Fixed DSN tests with Go 1.7+ (#459)
 - Handle ERR packets while waiting for EOF (#473)
 - Invalidate connection on error while discarding additional results (#513)
 - Allow terminating packets of length 0 (#516)


## Version 1.2 (2014-06-03)

Changes:

 - We switched back to a "rolling release". `go get` installs the current master branch again
 - Version v1 of the driver will not be maintained anymore. Go 1.0 is no longer supported by this driver
 - Exported errors to allow easy checking from application code
 - Enabled TCP Keepalives on TCP connections
 - Optimized INFILE handling (better buffer size calculation, lazy init, ...)
 - The DSN parser also checks for a missing separating slash
 - Faster binary date / datetime to string formatting
 - Also exported the MySQLWarning type
 - mysqlConn.Close returns the first error encountered instead of ignoring all errors
 - writePacket() automatically writes the packet size to the header
 - readPacket() uses an iterative approach instead of the recursive approach to merge splitted packets

New Features:

 - `RegisterDial` allows the usage of a custom dial function to establish the network connection
 - Setting the connection collation is possible with the `collation` DSN parameter. This parameter should be preferred over the `charset` parameter
 - Logging of critical errors is configurable with `SetLogger`
 - Google CloudSQL support

Bugfixes:

 - Allow more than 32 parameters in prepared statements
 - Various old_password fixes
 - Fixed TestConcurrent test to pass Go's race detection
 - Fixed appendLengthEncodedInteger for large numbers
 - Renamed readLengthEnodedString to readLengthEncodedString and skipLengthEnodedString to skipLengthEncodedString (fixed typo)


## Version 1.1 (2013-11-02)

Changes:

  - Go-MySQL-Driver now requires Go 1.1
  - Connections now use the collation `utf8_general_ci` by default. Adding `&charset=UTF8` to the DSN should not be necessary anymore
  - Made closing rows and connections error tolerant. This allows for example deferring rows.Close() without checking for errors
  - `[]byte(nil)` is now treated as a NULL value. Before, it was treated like an empty string / `[]byte("")`
  - DSN parameter values must now be url.QueryEscape'ed. This allows text values to contain special characters, such as '&'.
  - Use the IO buffer also for writing. This results in zero allocations (by the driver) for most queries
  - Optimized the buffer for reading
  - stmt.Query now caches column metadata
  - New Logo
  - Changed the copyright header to include all contributors
  - Improved the LOAD INFILE documentation
  - The driver struct is now exported to make the driver directly accessible
  - Refactored the driver tests
  - Added more benchmarks and moved all to a separate file
  - Other small refactoring

New Features:

  - Added *old_passwords* support: Required in some cases, but must be enabled by adding `allowOldPasswords=true` to the DSN since it is insecure
  - Added a `clientFoundRows` parameter: Return the number of matching rows instead of the number of rows changed on UPDATEs
  - Added TLS/SSL support: Use a TLS/SSL encrypted connection to the server. Custom TLS configs can be registered and used

Bugfixes:

  - Fixed MySQL 4.1 support: MySQL 4.1 sends packets with lengths which differ from the specification
  - Convert to DB timezone when inserting `time.Time`
  - Splitted packets (more than 16MB) are now merged correctly
  - Fixed false positive `io.EOF` errors when the data was fully read
  - Avoid panics on reuse of closed connections
  - Fixed empty string producing false nil values
  - Fixed sign byte for positive TIME fields


## Version 1.0 (2013-05-14)

Initial Release

A vendor/github.com/go-sql-driver/mysql/LICENSE => vendor/github.com/go-sql-driver/mysql/LICENSE +373 -0
@@ 0,0 1,373 @@
Mozilla Public License Version 2.0
==================================

1. Definitions
--------------

1.1. "Contributor"
    means each individual or legal entity that creates, contributes to
    the creation of, or owns Covered Software.

1.2. "Contributor Version"
    means the combination of the Contributions of others (if any) used
    by a Contributor and that particular Contributor's Contribution.

1.3. "Contribution"
    means Covered Software of a particular Contributor.

1.4. "Covered Software"
    means Source Code Form to which the initial Contributor has attached
    the notice in Exhibit A, the Executable Form of such Source Code
    Form, and Modifications of such Source Code Form, in each case
    including portions thereof.

1.5. "Incompatible With Secondary Licenses"
    means

    (a) that the initial Contributor has attached the notice described
        in Exhibit B to the Covered Software; or

    (b) that the Covered Software was made available under the terms of
        version 1.1 or earlier of the License, but not also under the
        terms of a Secondary License.

1.6. "Executable Form"
    means any form of the work other than Source Code Form.

1.7. "Larger Work"
    means a work that combines Covered Software with other material, in 
    a separate file or files, that is not Covered Software.

1.8. "License"
    means this document.

1.9. "Licensable"
    means having the right to grant, to the maximum extent possible,
    whether at the time of the initial grant or subsequently, any and
    all of the rights conveyed by this License.

1.10. "Modifications"
    means any of the following:

    (a) any file in Source Code Form that results from an addition to,
        deletion from, or modification of the contents of Covered
        Software; or

    (b) any new file in Source Code Form that contains any Covered
        Software.

1.11. "Patent Claims" of a Contributor
    means any patent claim(s), including without limitation, method,
    process, and apparatus claims, in any patent Licensable by such
    Contributor that would be infringed, but for the grant of the
    License, by the making, using, selling, offering for sale, having
    made, import, or transfer of either its Contributions or its
    Contributor Version.

1.12. "Secondary License"
    means either the GNU General Public License, Version 2.0, the GNU
    Lesser General Public License, Version 2.1, the GNU Affero General
    Public License, Version 3.0, or any later versions of those
    licenses.

1.13. "Source Code Form"
    means the form of the work preferred for making modifications.

1.14. "You" (or "Your")
    means an individual or a legal entity exercising rights under this
    License. For legal entities, "You" includes any entity that
    controls, is controlled by, or is under common control with You. For
    purposes of this definition, "control" means (a) the power, direct
    or indirect, to cause the direction or management of such entity,
    whether by contract or otherwise, or (b) ownership of more than
    fifty percent (50%) of the outstanding shares or beneficial
    ownership of such entity.

2. License Grants and Conditions
--------------------------------

2.1. Grants

Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:

(a) under intellectual property rights (other than patent or trademark)
    Licensable by such Contributor to use, reproduce, make available,
    modify, display, perform, distribute, and otherwise exploit its
    Contributions, either on an unmodified basis, with Modifications, or
    as part of a Larger Work; and

(b) under Patent Claims of such Contributor to make, use, sell, offer
    for sale, have made, import, and otherwise transfer either its
    Contributions or its Contributor Version.

2.2. Effective Date

The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.

2.3. Limitations on Grant Scope

The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:

(a) for any code that a Contributor has removed from Covered Software;
    or

(b) for infringements caused by: (i) Your and any other third party's
    modifications of Covered Software, or (ii) the combination of its
    Contributions with other software (except as part of its Contributor
    Version); or

(c) under Patent Claims infringed by Covered Software in the absence of
    its Contributions.

This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).

2.4. Subsequent Licenses

No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).

2.5. Representation

Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights
to grant the rights to its Contributions conveyed by this License.

2.6. Fair Use

This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.

2.7. Conditions

Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
in Section 2.1.

3. Responsibilities
-------------------

3.1. Distribution of Source Form

All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.

3.2. Distribution of Executable Form

If You distribute Covered Software in Executable Form then:

(a) such Covered Software must also be made available in Source Code
    Form, as described in Section 3.1, and You must inform recipients of
    the Executable Form how they can obtain a copy of such Source Code
    Form by reasonable means in a timely manner, at a charge no more
    than the cost of distribution to the recipient; and

(b) You may distribute such Executable Form under the terms of this
    License, or sublicense it under different terms, provided that the
    license for the Executable Form does not attempt to limit or alter
    the recipients' rights in the Source Code Form under this License.

3.3. Distribution of a Larger Work

You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).

3.4. Notices

You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty,
or limitations of liability) contained within the Source Code Form of
the Covered Software, except that You may alter any license notices to
the extent required to remedy known factual inaccuracies.

3.5. Application of Additional Terms

You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.

4. Inability to Comply Due to Statute or Regulation
---------------------------------------------------

If it is impossible for You to comply with any of the terms of this
License with respect to some or all of the Covered Software due to
statute, judicial order, or regulation then You must: (a) comply with
the terms of this License to the maximum extent possible; and (b)
describe the limitations and the code they affect. Such description must
be placed in a text file included with all distributions of the Covered
Software under this License. Except to the extent prohibited by statute
or regulation, such description must be sufficiently detailed for a
recipient of ordinary skill to be able to understand it.

5. Termination
--------------

5.1. The rights granted under this License will terminate automatically
if You fail to comply with any of its terms. However, if You become
compliant, then the rights granted under this License from a particular
Contributor are reinstated (a) provisionally, unless and until such
Contributor explicitly and finally terminates Your grants, and (b) on an
ongoing basis, if such Contributor fails to notify You of the
non-compliance by some reasonable means prior to 60 days after You have
come back into compliance. Moreover, Your grants from a particular
Contributor are reinstated on an ongoing basis if such Contributor
notifies You of the non-compliance by some reasonable means, this is the
first time You have received notice of non-compliance with this License
from such Contributor, and You become compliant prior to 30 days after
Your receipt of the notice.

5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.

5.3. In the event of termination under Sections 5.1 or 5.2 above, all
end user license agreements (excluding distributors and resellers) which
have been validly granted by You or Your distributors under this License
prior to termination shall survive termination.

************************************************************************
*                                                                      *
*  6. Disclaimer of Warranty                                           *
*  -------------------------                                           *
*                                                                      *
*  Covered Software is provided under this License on an "as is"       *
*  basis, without warranty of any kind, either expressed, implied, or  *
*  statutory, including, without limitation, warranties that the       *
*  Covered Software is free of defects, merchantable, fit for a        *
*  particular purpose or non-infringing. The entire risk as to the     *
*  quality and performance of the Covered Software is with You.        *
*  Should any Covered Software prove defective in any respect, You     *
*  (not any Contributor) assume the cost of any necessary servicing,   *
*  repair, or correction. This disclaimer of warranty constitutes an   *
*  essential part of this License. No use of any Covered Software is   *
*  authorized under this License except under this disclaimer.         *
*                                                                      *
************************************************************************

************************************************************************
*                                                                      *
*  7. Limitation of Liability                                          *
*  --------------------------                                          *
*                                                                      *
*  Under no circumstances and under no legal theory, whether tort      *
*  (including negligence), contract, or otherwise, shall any           *
*  Contributor, or anyone who distributes Covered Software as          *
*  permitted above, be liable to You for any direct, indirect,         *
*  special, incidental, or consequential damages of any character      *
*  including, without limitation, damages for lost profits, loss of    *
*  goodwill, work stoppage, computer failure or malfunction, or any    *
*  and all other commercial damages or losses, even if such party      *
*  shall have been informed of the possibility of such damages. This   *
*  limitation of liability shall not apply to liability for death or   *
*  personal injury resulting from such party's negligence to the       *
*  extent applicable law prohibits such limitation. Some               *
*  jurisdictions do not allow the exclusion or limitation of           *
*  incidental or consequential damages, so this exclusion and          *
*  limitation may not apply to You.                                    *
*                                                                      *
************************************************************************

8. Litigation
-------------

Any litigation relating to this License may be brought only in the
courts of a jurisdiction where the defendant maintains its principal
place of business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions.
Nothing in this Section shall prevent a party's ability to bring
cross-claims or counter-claims.

9. Miscellaneous
----------------

This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides
that the language of a contract shall be construed against the drafter
shall not be used to construe this License against a Contributor.

10. Versions of the License
---------------------------

10.1. New Versions

Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.

10.2. Effect of New Versions

You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.

10.3. Modified Versions

If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).

10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses

If You choose to distribute Source Code Form that is Incompatible With
Secondary Licenses under the terms of this version of the License, the
notice described in Exhibit B of this License must be attached.

Exhibit A - Source Code Form License Notice
-------------------------------------------

  This Source Code Form is subject to the terms of the Mozilla Public
  License, v. 2.0. If a copy of the MPL was not distributed with this
  file, You can obtain one at http://mozilla.org/MPL/2.0/.

If it is not possible or desirable to put the notice in a particular
file, then You may include the notice in a location (such as a LICENSE
file in a relevant directory) where a recipient would be likely to look
for such a notice.

You may add additional accurate notices of copyright ownership.

Exhibit B - "Incompatible With Secondary Licenses" Notice
---------------------------------------------------------

  This Source Code Form is "Incompatible With Secondary Licenses", as
  defined by the Mozilla Public License, v. 2.0.

A vendor/github.com/go-sql-driver/mysql/README.md => vendor/github.com/go-sql-driver/mysql/README.md +501 -0
@@ 0,0 1,501 @@
# Go-MySQL-Driver

A MySQL-Driver for Go's [database/sql](https://golang.org/pkg/database/sql/) package

![Go-MySQL-Driver logo](https://raw.github.com/wiki/go-sql-driver/mysql/gomysql_m.png "Golang Gopher holding the MySQL Dolphin")

---------------------------------------
  * [Features](#features)
  * [Requirements](#requirements)
  * [Installation](#installation)
  * [Usage](#usage)
    * [DSN (Data Source Name)](#dsn-data-source-name)
      * [Password](#password)
      * [Protocol](#protocol)
      * [Address](#address)
      * [Parameters](#parameters)
      * [Examples](#examples)
    * [Connection pool and timeouts](#connection-pool-and-timeouts)
    * [context.Context Support](#contextcontext-support)
    * [ColumnType Support](#columntype-support)
    * [LOAD DATA LOCAL INFILE support](#load-data-local-infile-support)
    * [time.Time support](#timetime-support)
    * [Unicode support](#unicode-support)
  * [Testing / Development](#testing--development)
  * [License](#license)

---------------------------------------

## Features
  * Lightweight and [fast](https://github.com/go-sql-driver/sql-benchmark "golang MySQL-Driver performance")
  * Native Go implementation. No C-bindings, just pure Go
  * Connections over TCP/IPv4, TCP/IPv6, Unix domain sockets or [custom protocols](https://godoc.org/github.com/go-sql-driver/mysql#DialFunc)
  * Automatic handling of broken connections
  * Automatic Connection Pooling *(by database/sql package)*
  * Supports queries larger than 16MB
  * Full [`sql.RawBytes`](https://golang.org/pkg/database/sql/#RawBytes) support.
  * Intelligent `LONG DATA` handling in prepared statements
  * Secure `LOAD DATA LOCAL INFILE` support with file Whitelisting and `io.Reader` support
  * Optional `time.Time` parsing
  * Optional placeholder interpolation

## Requirements
  * Go 1.10 or higher. We aim to support the 3 latest versions of Go.
  * MySQL (4.1+), MariaDB, Percona Server, Google CloudSQL or Sphinx (2.2.3+)

---------------------------------------

## Installation
Simple install the package to your [$GOPATH](https://github.com/golang/go/wiki/GOPATH "GOPATH") with the [go tool](https://golang.org/cmd/go/ "go command") from shell:
```bash
$ go get -u github.com/go-sql-driver/mysql
```
Make sure [Git is installed](https://git-scm.com/downloads) on your machine and in your system's `PATH`.

## Usage
_Go MySQL Driver_ is an implementation of Go's `database/sql/driver` interface. You only need to import the driver and can use the full [`database/sql`](https://golang.org/pkg/database/sql/) API then.

Use `mysql` as `driverName` and a valid [DSN](#dsn-data-source-name)  as `dataSourceName`:
```go
import "database/sql"
import _ "github.com/go-sql-driver/mysql"

db, err := sql.Open("mysql", "user:password@/dbname")
```

[Examples are available in our Wiki](https://github.com/go-sql-driver/mysql/wiki/Examples "Go-MySQL-Driver Examples").


### DSN (Data Source Name)

The Data Source Name has a common format, like e.g. [PEAR DB](http://pear.php.net/manual/en/package.database.db.intro-dsn.php) uses it, but without type-prefix (optional parts marked by squared brackets):
```
[username[:password]@][protocol[(address)]]/dbname[?param1=value1&...&paramN=valueN]
```

A DSN in its fullest form:
```
username:password@protocol(address)/dbname?param=value
```

Except for the databasename, all values are optional. So the minimal DSN is:
```
/dbname
```

If you do not want to preselect a database, leave `dbname` empty:
```
/
```
This has the same effect as an empty DSN string:
```

```

Alternatively, [Config.FormatDSN](https://godoc.org/github.com/go-sql-driver/mysql#Config.FormatDSN) can be used to create a DSN string by filling a struct.

#### Password
Passwords can consist of any character. Escaping is **not** necessary.

#### Protocol
See [net.Dial](https://golang.org/pkg/net/#Dial) for more information which networks are available.
In general you should use an Unix domain socket if available and TCP otherwise for best performance.

#### Address
For TCP and UDP networks, addresses have the form `host[:port]`.
If `port` is omitted, the default port will be used.
If `host` is a literal IPv6 address, it must be enclosed in square brackets.
The functions [net.JoinHostPort](https://golang.org/pkg/net/#JoinHostPort) and [net.SplitHostPort](https://golang.org/pkg/net/#SplitHostPort) manipulate addresses in this form.

For Unix domain sockets the address is the absolute path to the MySQL-Server-socket, e.g. `/var/run/mysqld/mysqld.sock` or `/tmp/mysql.sock`.

#### Parameters
*Parameters are case-sensitive!*

Notice that any of `true`, `TRUE`, `True` or `1` is accepted to stand for a true boolean value. Not surprisingly, false can be specified as any of: `false`, `FALSE`, `False` or `0`.

##### `allowAllFiles`

```
Type:           bool
Valid Values:   true, false
Default:        false
```

`allowAllFiles=true` disables the file Whitelist for `LOAD DATA LOCAL INFILE` and allows *all* files.
[*Might be insecure!*](http://dev.mysql.com/doc/refman/5.7/en/load-data-local.html)

##### `allowCleartextPasswords`

```
Type:           bool
Valid Values:   true, false
Default:        false
```

`allowCleartextPasswords=true` allows using the [cleartext client side plugin](http://dev.mysql.com/doc/en/cleartext-authentication-plugin.html) if required by an account, such as one defined with the [PAM authentication plugin](http://dev.mysql.com/doc/en/pam-authentication-plugin.html). Sending passwords in clear text may be a security problem in some configurations. To avoid problems if there is any possibility that the password would be intercepted, clients should connect to MySQL Server using a method that protects the password. Possibilities include [TLS / SSL](#tls), IPsec, or a private network.

##### `allowNativePasswords`

```
Type:           bool
Valid Values:   true, false
Default:        true
```
`allowNativePasswords=false` disallows the usage of MySQL native password method.

##### `allowOldPasswords`

```
Type:           bool
Valid Values:   true, false
Default:        false
```
`allowOldPasswords=true` allows the usage of the insecure old password method. This should be avoided, but is necessary in some cases. See also [the old_passwords wiki page](https://github.com/go-sql-driver/mysql/wiki/old_passwords).

##### `charset`

```
Type:           string
Valid Values:   <name>
Default:        none
```

Sets the charset used for client-server interaction (`"SET NAMES <value>"`). If multiple charsets are set (separated by a comma), the following charset is used if setting the charset failes. This enables for example support for `utf8mb4` ([introduced in MySQL 5.5.3](http://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html)) with fallback to `utf8` for older servers (`charset=utf8mb4,utf8`).

Usage of the `charset` parameter is discouraged because it issues additional queries to the server.
Unless you need the fallback behavior, please use `collation` instead.

##### `checkConnLiveness`

```
Type:           bool
Valid Values:   true, false
Default:        true
```

On supported platforms connections retrieved from the connection pool are checked for liveness before using them. If the check fails, the respective connection is marked as bad and the query retried with another connection.
`checkConnLiveness=false` disables this liveness check of connections.

##### `collation`

```
Type:           string
Valid Values:   <name>
Default:        utf8mb4_general_ci
```

Sets the collation used for client-server interaction on connection. In contrast to `charset`, `collation` does not issue additional queries. If the specified collation is unavailable on the target server, the connection will fail.

A list of valid charsets for a server is retrievable with `SHOW COLLATION`.

The default collation (`utf8mb4_general_ci`) is supported from MySQL 5.5.  You should use an older collation (e.g. `utf8_general_ci`) for older MySQL.

Collations for charset "ucs2", "utf16", "utf16le", and "utf32" can not be used ([ref](https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html#charset-connection-impermissible-client-charset)).


##### `clientFoundRows`

```
Type:           bool
Valid Values:   true, false
Default:        false
```

`clientFoundRows=true` causes an UPDATE to return the number of matching rows instead of the number of rows changed.

##### `columnsWithAlias`

```
Type:           bool
Valid Values:   true, false
Default:        false
```

When `columnsWithAlias` is true, calls to `sql.Rows.Columns()` will return the table alias and the column name separated by a dot. For example:

```
SELECT u.id FROM users as u
```

will return `u.id` instead of just `id` if `columnsWithAlias=true`.

##### `interpolateParams`

```
Type:           bool
Valid Values:   true, false
Default:        false
```

If `interpolateParams` is true, placeholders (`?`) in calls to `db.Query()` and `db.Exec()` are interpolated into a single query string with given parameters. This reduces the number of roundtrips, since the driver has to prepare a statement, execute it with given parameters and close the statement again with `interpolateParams=false`.

*This can not be used together with the multibyte encodings BIG5, CP932, GB2312, GBK or SJIS. These are blacklisted as they may [introduce a SQL injection vulnerability](http://stackoverflow.com/a/12118602/3430118)!*

##### `loc`

```
Type:           string
Valid Values:   <escaped name>
Default:        UTC
```

Sets the location for time.Time values (when using `parseTime=true`). *"Local"* sets the system's location. See [time.LoadLocation](https://golang.org/pkg/time/#LoadLocation) for details.

Note that this sets the location for time.Time values but does not change MySQL's [time_zone setting](https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html). For that see the [time_zone system variable](#system-variables), which can also be set as a DSN parameter.

Please keep in mind, that param values must be [url.QueryEscape](https://golang.org/pkg/net/url/#QueryEscape)'ed. Alternatively you can manually replace the `/` with `%2F`. For example `US/Pacific` would be `loc=US%2FPacific`.

##### `maxAllowedPacket`
```
Type:          decimal number
Default:       4194304
```

Max packet size allowed in bytes. The default value is 4 MiB and should be adjusted to match the server settings. `maxAllowedPacket=0` can be used to automatically fetch the `max_allowed_packet` variable from server *on every connection*.

##### `multiStatements`

```
Type:           bool
Valid Values:   true, false
Default:        false
```

Allow multiple statements in one query. While this allows batch queries, it also greatly increases the risk of SQL injections. Only the result of the first query is returned, all other results are silently discarded.

When `multiStatements` is used, `?` parameters must only be used in the first statement.

##### `parseTime`

```
Type:           bool
Valid Values:   true, false
Default:        false
```

`parseTime=true` changes the output type of `DATE` and `DATETIME` values to `time.Time` instead of `[]byte` / `string`
The date or datetime like `0000-00-00 00:00:00` is converted into zero value of `time.Time`.


##### `readTimeout`

```
Type:           duration
Default:        0
```

I/O read timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.

##### `rejectReadOnly`

```
Type:           bool
Valid Values:   true, false
Default:        false
```


`rejectReadOnly=true` causes the driver to reject read-only connections. This
is for a possible race condition during an automatic failover, where the mysql
client gets connected to a read-only replica after the failover.

Note that this should be a fairly rare case, as an automatic failover normally
happens when the primary is down, and the race condition shouldn't happen
unless it comes back up online as soon as the failover is kicked off. On the
other hand, when this happens, a MySQL application can get stuck on a
read-only connection until restarted. It is however fairly easy to reproduce,
for example, using a manual failover on AWS Aurora's MySQL-compatible cluster.

If you are not relying on read-only transactions to reject writes that aren't
supposed to happen, setting this on some MySQL providers (such as AWS Aurora)
is safer for failovers.

Note that ERROR 1290 can be returned for a `read-only` server and this option will
cause a retry for that error. However the same error number is used for some
other cases. You should ensure your application will never cause an ERROR 1290
except for `read-only` mode when enabling this option.


##### `serverPubKey`

```
Type:           string
Valid Values:   <name>
Default:        none
```

Server public keys can be registered with [`mysql.RegisterServerPubKey`](https://godoc.org/github.com/go-sql-driver/mysql#RegisterServerPubKey), which can then be used by the assigned name in the DSN.
Public keys are used to transmit encrypted data, e.g. for authentication.
If the server's public key is known, it should be set manually to avoid expensive and potentially insecure transmissions of the public key from the server to the client each time it is required.


##### `timeout`

```
Type:           duration
Default:        OS default
```

Timeout for establishing connections, aka dial timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.


##### `tls`

```
Type:           bool / string
Valid Values:   true, false, skip-verify, preferred, <name>
Default:        false
```

`tls=true` enables TLS / SSL encrypted connection to the server. Use `skip-verify` if you want to use a self-signed or invalid certificate (server side) or use `preferred` to use TLS only when advertised by the server. This is similar to `skip-verify`, but additionally allows a fallback to a connection which is not encrypted. Neither `skip-verify` nor `preferred` add any reliable security. You can use a custom TLS config after registering it with [`mysql.RegisterTLSConfig`](https://godoc.org/github.com/go-sql-driver/mysql#RegisterTLSConfig).


##### `writeTimeout`

```
Type:           duration
Default:        0
```

I/O write timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.


##### System Variables

Any other parameters are interpreted as system variables:
  * `<boolean_var>=<value>`: `SET <boolean_var>=<value>`
  * `<enum_var>=<value>`: `SET <enum_var>=<value>`
  * `<string_var>=%27<value>%27`: `SET <string_var>='<value>'`

Rules:
* The values for string variables must be quoted with `'`.
* The values must also be [url.QueryEscape](http://golang.org/pkg/net/url/#QueryEscape)'ed!
 (which implies values of string variables must be wrapped with `%27`).

Examples:
  * `autocommit=1`: `SET autocommit=1`
  * [`time_zone=%27Europe%2FParis%27`](https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html): `SET time_zone='Europe/Paris'`
  * [`tx_isolation=%27REPEATABLE-READ%27`](https://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html#sysvar_tx_isolation): `SET tx_isolation='REPEATABLE-READ'`


#### Examples
```
user@unix(/path/to/socket)/dbname
```

```
root:pw@unix(/tmp/mysql.sock)/myDatabase?loc=Local
```

```
user:password@tcp(localhost:5555)/dbname?tls=skip-verify&autocommit=true
```

Treat warnings as errors by setting the system variable [`sql_mode`](https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html):
```
user:password@/dbname?sql_mode=TRADITIONAL
```

TCP via IPv6:
```
user:password@tcp([de:ad:be:ef::ca:fe]:80)/dbname?timeout=90s&collation=utf8mb4_unicode_ci
```

TCP on a remote host, e.g. Amazon RDS:
```
id:password@tcp(your-amazonaws-uri.com:3306)/dbname
```

Google Cloud SQL on App Engine:
```
user:password@unix(/cloudsql/project-id:region-name:instance-name)/dbname
```

TCP using default port (3306) on localhost:
```
user:password@tcp/dbname?charset=utf8mb4,utf8&sys_var=esc%40ped
```

Use the default protocol (tcp) and host (localhost:3306):
```
user:password@/dbname
```

No Database preselected:
```
user:password@/
```


### Connection pool and timeouts
The connection pool is managed by Go's database/sql package. For details on how to configure the size of the pool and how long connections stay in the pool see `*DB.SetMaxOpenConns`, `*DB.SetMaxIdleConns`, and `*DB.SetConnMaxLifetime` in the [database/sql documentation](https://golang.org/pkg/database/sql/). The read, write, and dial timeouts for each individual connection are configured with the DSN parameters [`readTimeout`](#readtimeout), [`writeTimeout`](#writetimeout), and [`timeout`](#timeout), respectively.

## `ColumnType` Support
This driver supports the [`ColumnType` interface](https://golang.org/pkg/database/sql/#ColumnType) introduced in Go 1.8, with the exception of [`ColumnType.Length()`](https://golang.org/pkg/database/sql/#ColumnType.Length), which is currently not supported.

## `context.Context` Support
Go 1.8 added `database/sql` support for `context.Context`. This driver supports query timeouts and cancellation via contexts.
See [context support in the database/sql package](https://golang.org/doc/go1.8#database_sql) for more details.


### `LOAD DATA LOCAL INFILE` support
For this feature you need direct access to the package. Therefore you must change the import path (no `_`):
```go
import "github.com/go-sql-driver/mysql"
```

Files must be whitelisted by registering them with `mysql.RegisterLocalFile(filepath)` (recommended) or the Whitelist check must be deactivated by using the DSN parameter `allowAllFiles=true` ([*Might be insecure!*](http://dev.mysql.com/doc/refman/5.7/en/load-data-local.html)).

To use a `io.Reader` a handler function must be registered with `mysql.RegisterReaderHandler(name, handler)` which returns a `io.Reader` or `io.ReadCloser`. The Reader is available with the filepath `Reader::<name>` then. Choose different names for different handlers and `DeregisterReaderHandler` when you don't need it anymore.

See the [godoc of Go-MySQL-Driver](https://godoc.org/github.com/go-sql-driver/mysql "golang mysql driver documentation") for details.


### `time.Time` support
The default internal output type of MySQL `DATE` and `DATETIME` values is `[]byte` which allows you to scan the value into a `[]byte`, `string` or `sql.RawBytes` variable in your program.

However, many want to scan MySQL `DATE` and `DATETIME` values into `time.Time` variables, which is the logical equivalent in Go to `DATE` and `DATETIME` in MySQL. You can do that by changing the internal output type from `[]byte` to `time.Time` with the DSN parameter `parseTime=true`. You can set the default [`time.Time` location](https://golang.org/pkg/time/#Location) with the `loc` DSN parameter.

**Caution:** As of Go 1.1, this makes `time.Time` the only variable type you can scan `DATE` and `DATETIME` values into. This breaks for example [`sql.RawBytes` support](https://github.com/go-sql-driver/mysql/wiki/Examples#rawbytes).

Alternatively you can use the [`NullTime`](https://godoc.org/github.com/go-sql-driver/mysql#NullTime) type as the scan destination, which works with both `time.Time` and `string` / `[]byte`.


### Unicode support
Since version 1.5 Go-MySQL-Driver automatically uses the collation ` utf8mb4_general_ci` by default.

Other collations / charsets can be set using the [`collation`](#collation) DSN parameter.

Version 1.0 of the driver recommended adding `&charset=utf8` (alias for `SET NAMES utf8`) to the DSN to enable proper UTF-8 support. This is not necessary anymore. The [`collation`](#collation) parameter should be preferred to set another collation / charset than the default.

See http://dev.mysql.com/doc/refman/8.0/en/charset-unicode.html for more details on MySQL's Unicode support.

## Testing / Development
To run the driver tests you may need to adjust the configuration. See the [Testing Wiki-Page](https://github.com/go-sql-driver/mysql/wiki/Testing "Testing") for details.

Go-MySQL-Driver is not feature-complete yet. Your help is very appreciated.
If you want to contribute, you can work on an [open issue](https://github.com/go-sql-driver/mysql/issues?state=open) or review a [pull request](https://github.com/go-sql-driver/mysql/pulls).

See the [Contribution Guidelines](https://github.com/go-sql-driver/mysql/blob/master/CONTRIBUTING.md) for details.

---------------------------------------

## License
Go-MySQL-Driver is licensed under the [Mozilla Public License Version 2.0](https://raw.github.com/go-sql-driver/mysql/master/LICENSE)

Mozilla summarizes the license scope as follows:
> MPL: The copyleft applies to any files containing MPLed code.


That means:
  * You can **use** the **unchanged** source code both in private and commercially.
  * When distributing, you **must publish** the source code of any **changed files** licensed under the MPL 2.0 under a) the MPL 2.0 itself or b) a compatible license (e.g. GPL 3.0 or Apache License 2.0).
  * You **needn't publish** the source code of your library as long as the files licensed under the MPL 2.0 are **unchanged**.

Please read the [MPL 2.0 FAQ](https://www.mozilla.org/en-US/MPL/2.0/FAQ/) if you have further questions regarding the license.

You can read the full terms here: [LICENSE](https://raw.github.com/go-sql-driver/mysql/master/LICENSE).

![Go Gopher and MySQL Dolphin](https://raw.github.com/wiki/go-sql-driver/mysql/go-mysql-driver_m.jpg "Golang Gopher transporting the MySQL Dolphin in a wheelbarrow")


A vendor/github.com/go-sql-driver/mysql/auth.go => vendor/github.com/go-sql-driver/mysql/auth.go +422 -0
@@ 0,0 1,422 @@
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2018 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

package mysql

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/sha1"
	"crypto/sha256"
	"crypto/x509"
	"encoding/pem"
	"sync"
)

// server pub keys registry
var (
	serverPubKeyLock     sync.RWMutex
	serverPubKeyRegistry map[string]*rsa.PublicKey
)

// RegisterServerPubKey registers a server RSA public key which can be used to
// send data in a secure manner to the server without receiving the public key
// in a potentially insecure way from the server first.
// Registered keys can afterwards be used adding serverPubKey=<name> to the DSN.
//
// Note: The provided rsa.PublicKey instance is exclusively owned by the driver
// after registering it and may not be modified.
//
//  data, err := ioutil.ReadFile("mykey.pem")
//  if err != nil {
//  	log.Fatal(err)
//  }
//
//  block, _ := pem.Decode(data)
//  if block == nil || block.Type != "PUBLIC KEY" {
//  	log.Fatal("failed to decode PEM block containing public key")
//  }
//
//  pub, err := x509.ParsePKIXPublicKey(block.Bytes)
//  if err != nil {
//  	log.Fatal(err)
//  }
//
//  if rsaPubKey, ok := pub.(*rsa.PublicKey); ok {
//  	mysql.RegisterServerPubKey("mykey", rsaPubKey)
//  } else {
//  	log.Fatal("not a RSA public key")
//  }
//
func RegisterServerPubKey(name string, pubKey *rsa.PublicKey) {
	serverPubKeyLock.Lock()
	if serverPubKeyRegistry == nil {
		serverPubKeyRegistry = make(map[string]*rsa.PublicKey)
	}

	serverPubKeyRegistry[name] = pubKey
	serverPubKeyLock.Unlock()
}

// DeregisterServerPubKey removes the public key registered with the given name.
func DeregisterServerPubKey(name string) {
	serverPubKeyLock.Lock()
	if serverPubKeyRegistry != nil {
		delete(serverPubKeyRegistry, name)
	}
	serverPubKeyLock.Unlock()
}

func getServerPubKey(name string) (pubKey *rsa.PublicKey) {
	serverPubKeyLock.RLock()
	if v, ok := serverPubKeyRegistry[name]; ok {
		pubKey = v
	}
	serverPubKeyLock.RUnlock()
	return
}

// Hash password using pre 4.1 (old password) method
// https://github.com/atcurtis/mariadb/blob/master/mysys/my_rnd.c
type myRnd struct {
	seed1, seed2 uint32
}

const myRndMaxVal = 0x3FFFFFFF

// Pseudo random number generator
func newMyRnd(seed1, seed2 uint32) *myRnd {
	return &myRnd{
		seed1: seed1 % myRndMaxVal,
		seed2: seed2 % myRndMaxVal,
	}
}

// Tested to be equivalent to MariaDB's floating point variant
// http://play.golang.org/p/QHvhd4qved
// http://play.golang.org/p/RG0q4ElWDx
func (r *myRnd) NextByte() byte {
	r.seed1 = (r.seed1*3 + r.seed2) % myRndMaxVal
	r.seed2 = (r.seed1 + r.seed2 + 33) % myRndMaxVal

	return byte(uint64(r.seed1) * 31 / myRndMaxVal)
}

// Generate binary hash from byte string using insecure pre 4.1 method
func pwHash(password []byte) (result [2]uint32) {
	var add uint32 = 7
	var tmp uint32

	result[0] = 1345345333
	result[1] = 0x12345671

	for _, c := range password {
		// skip spaces and tabs in password
		if c == ' ' || c == '\t' {
			continue
		}

		tmp = uint32(c)
		result[0] ^= (((result[0] & 63) + add) * tmp) + (result[0] << 8)
		result[1] += (result[1] << 8) ^ result[0]
		add += tmp
	}

	// Remove sign bit (1<<31)-1)
	result[0] &= 0x7FFFFFFF
	result[1] &= 0x7FFFFFFF

	return
}

// Hash password using insecure pre 4.1 method
func scrambleOldPassword(scramble []byte, password string) []byte {
	if len(password) == 0 {
		return nil
	}

	scramble = scramble[:8]

	hashPw := pwHash([]byte(password))
	hashSc := pwHash(scramble)

	r := newMyRnd(hashPw[0]^hashSc[0], hashPw[1]^hashSc[1])

	var out [8]byte
	for i := range out {
		out[i] = r.NextByte() + 64
	}

	mask := r.NextByte()
	for i := range out {
		out[i] ^= mask
	}

	return out[:]
}

// Hash password using 4.1+ method (SHA1)
func scramblePassword(scramble []byte, password string) []byte {
	if len(password) == 0 {
		return nil
	}

	// stage1Hash = SHA1(password)
	crypt := sha1.New()
	crypt.Write([]byte(password))
	stage1 := crypt.Sum(nil)

	// scrambleHash = SHA1(scramble + SHA1(stage1Hash))
	// inner Hash
	crypt.Reset()
	crypt.Write(stage1)
	hash := crypt.Sum(nil)

	// outer Hash
	crypt.Reset()
	crypt.Write(scramble)
	crypt.Write(hash)
	scramble = crypt.Sum(nil)

	// token = scrambleHash XOR stage1Hash
	for i := range scramble {
		scramble[i] ^= stage1[i]
	}
	return scramble
}

// Hash password using MySQL 8+ method (SHA256)
func scrambleSHA256Password(scramble []byte, password string) []byte {
	if len(password) == 0 {
		return nil
	}

	// XOR(SHA256(password), SHA256(SHA256(SHA256(password)), scramble))

	crypt := sha256.New()
	crypt.Write([]byte(password))
	message1 := crypt.Sum(nil)

	crypt.Reset()
	crypt.Write(message1)
	message1Hash := crypt.Sum(nil)

	crypt.Reset()
	crypt.Write(message1Hash)
	crypt.Write(scramble)
	message2 := crypt.Sum(nil)

	for i := range message1 {
		message1[i] ^= message2[i]
	}

	return message1
}

func encryptPassword(password string, seed []byte, pub *rsa.PublicKey) ([]byte, error) {
	plain := make([]byte, len(password)+1)
	copy(plain, password)
	for i := range plain {
		j := i % len(seed)
		plain[i] ^= seed[j]
	}
	sha1 := sha1.New()
	return rsa.EncryptOAEP(sha1, rand.Reader, pub, plain, nil)
}

func (mc *mysqlConn) sendEncryptedPassword(seed []byte, pub *rsa.PublicKey) error {
	enc, err := encryptPassword(mc.cfg.Passwd, seed, pub)
	if err != nil {
		return err
	}
	return mc.writeAuthSwitchPacket(enc)
}

func (mc *mysqlConn) auth(authData []byte, plugin string) ([]byte, error) {
	switch plugin {
	case "caching_sha2_password":
		authResp := scrambleSHA256Password(authData, mc.cfg.Passwd)
		return authResp, nil

	case "mysql_old_password":
		if !mc.cfg.AllowOldPasswords {
			return nil, ErrOldPassword
		}
		// Note: there are edge cases where this should work but doesn't;
		// this is currently "wontfix":
		// https://github.com/go-sql-driver/mysql/issues/184
		authResp := append(scrambleOldPassword(authData[:8], mc.cfg.Passwd), 0)
		return authResp, nil

	case "mysql_clear_password":
		if !mc.cfg.AllowCleartextPasswords {
			return nil, ErrCleartextPassword
		}
		// http://dev.mysql.com/doc/refman/5.7/en/cleartext-authentication-plugin.html
		// http://dev.mysql.com/doc/refman/5.7/en/pam-authentication-plugin.html
		return append([]byte(mc.cfg.Passwd), 0), nil

	case "mysql_native_password":
		if !mc.cfg.AllowNativePasswords {
			return nil, ErrNativePassword
		}
		// https://dev.mysql.com/doc/internals/en/secure-password-authentication.html
		// Native password authentication only need and will need 20-byte challenge.
		authResp := scramblePassword(authData[:20], mc.cfg.Passwd)
		return authResp, nil

	case "sha256_password":
		if len(mc.cfg.Passwd) == 0 {
			return []byte{0}, nil
		}
		if mc.cfg.tls != nil || mc.cfg.Net == "unix" {
			// write cleartext auth packet
			return append([]byte(mc.cfg.Passwd), 0), nil
		}

		pubKey := mc.cfg.pubKey
		if pubKey == nil {
			// request public key from server
			return []byte{1}, nil
		}

		// encrypted password
		enc, err := encryptPassword(mc.cfg.Passwd, authData, pubKey)
		return enc, err

	default:
		errLog.Print("unknown auth plugin:", plugin)
		return nil, ErrUnknownPlugin
	}
}

func (mc *mysqlConn) handleAuthResult(oldAuthData []byte, plugin string) error {
	// Read Result Packet
	authData, newPlugin, err := mc.readAuthResult()
	if err != nil {
		return err
	}

	// handle auth plugin switch, if requested
	if newPlugin != "" {
		// If CLIENT_PLUGIN_AUTH capability is not supported, no new cipher is
		// sent and we have to keep using the cipher sent in the init packet.
		if authData == nil {
			authData = oldAuthData
		} else {
			// copy data from read buffer to owned slice
			copy(oldAuthData, authData)
		}

		plugin = newPlugin

		authResp, err := mc.auth(authData, plugin)
		if err != nil {
			return err
		}
		if err = mc.writeAuthSwitchPacket(authResp); err != nil {
			return err
		}

		// Read Result Packet
		authData, newPlugin, err = mc.readAuthResult()
		if err != nil {
			return err
		}

		// Do not allow to change the auth plugin more than once
		if newPlugin != "" {
			return ErrMalformPkt
		}
	}

	switch plugin {

	// https://insidemysql.com/preparing-your-community-connector-for-mysql-8-part-2-sha256/
	case "caching_sha2_password":
		switch len(authData) {
		case 0:
			return nil // auth successful
		case 1:
			switch authData[0] {
			case cachingSha2PasswordFastAuthSuccess:
				if err = mc.readResultOK(); err == nil {
					return nil // auth successful
				}

			case cachingSha2PasswordPerformFullAuthentication:
				if mc.cfg.tls != nil || mc.cfg.Net == "unix" {
					// write cleartext auth packet
					err = mc.writeAuthSwitchPacket(append([]byte(mc.cfg.Passwd), 0))
					if err != nil {
						return err
					}
				} else {
					pubKey := mc.cfg.pubKey
					if pubKey == nil {
						// request public key from server
						data, err := mc.buf.takeSmallBuffer(4 + 1)
						if err != nil {
							return err
						}
						data[4] = cachingSha2PasswordRequestPublicKey
						mc.writePacket(data)

						// parse public key
						if data, err = mc.readPacket(); err != nil {
							return err
						}

						block, _ := pem.Decode(data[1:])
						pkix, err := x509.ParsePKIXPublicKey(block.Bytes)
						if err != nil {
							return err
						}
						pubKey = pkix.(*rsa.PublicKey)
					}

					// send encrypted password
					err = mc.sendEncryptedPassword(oldAuthData, pubKey)
					if err != nil {
						return err
					}
				}
				return mc.readResultOK()

			default:
				return ErrMalformPkt
			}
		default:
			return ErrMalformPkt
		}

	case "sha256_password":
		switch len(authData) {
		case 0:
			return nil // auth successful
		default:
			block, _ := pem.Decode(authData)
			pub, err := x509.ParsePKIXPublicKey(block.Bytes)
			if err != nil {
				return err
			}

			// send encrypted password
			err = mc.sendEncryptedPassword(oldAuthData, pub.(*rsa.PublicKey))
			if err != nil {
				return err
			}
			return mc.readResultOK()
		}

	default:
		return nil // auth successful
	}

	return err
}

A vendor/github.com/go-sql-driver/mysql/buffer.go => vendor/github.com/go-sql-driver/mysql/buffer.go +182 -0
@@ 0,0 1,182 @@
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

package mysql

import (
	"io"
	"net"
	"time"
)

const defaultBufSize = 4096
const maxCachedBufSize = 256 * 1024

// A buffer which is used for both reading and writing.
// This is possible since communication on each connection is synchronous.
// In other words, we can't write and read simultaneously on the same connection.
// The buffer is similar to bufio.Reader / Writer but zero-copy-ish
// Also highly optimized for this particular use case.
// This buffer is backed by two byte slices in a double-buffering scheme
type buffer struct {
	buf     []byte // buf is a byte buffer who's length and capacity are equal.
	nc      net.Conn
	idx     int
	length  int
	timeout time.Duration
	dbuf    [2][]byte // dbuf is an array with the two byte slices that back this buffer
	flipcnt uint      // flipccnt is the current buffer counter for double-buffering
}

// newBuffer allocates and returns a new buffer.
func newBuffer(nc net.Conn) buffer {
	fg := make([]byte, defaultBufSize)
	return buffer{
		buf:  fg,
		nc:   nc,
		dbuf: [2][]byte{fg, nil},
	}
}

// flip replaces the active buffer with the background buffer
// this is a delayed flip that simply increases the buffer counter;
// the actual flip will be performed the next time we call `buffer.fill`
func (b *buffer) flip() {
	b.flipcnt += 1
}

// fill reads into the buffer until at least _need_ bytes are in it
func (b *buffer) fill(need int) error {
	n := b.length
	// fill data into its double-buffering target: if we've called
	// flip on this buffer, we'll be copying to the background buffer,
	// and then filling it with network data; otherwise we'll just move
	// the contents of the current buffer to the front before filling it
	dest := b.dbuf[b.flipcnt&1]

	// grow buffer if necessary to fit the whole packet.
	if need > len(dest) {
		// Round up to the next multiple of the default size
		dest = make([]byte, ((need/defaultBufSize)+1)*defaultBufSize)

		// if the allocated buffer is not too large, move it to backing storage
		// to prevent extra allocations on applications that perform large reads
		if len(dest) <= maxCachedBufSize {
			b.dbuf[b.flipcnt&1] = dest
		}
	}

	// if we're filling the fg buffer, move the existing data to the start of it.
	// if we're filling the bg buffer, copy over the data
	if n > 0 {
		copy(dest[:n], b.buf[b.idx:])
	}

	b.buf = dest
	b.idx = 0

	for {
		if b.timeout > 0 {
			if err := b.nc.SetReadDeadline(time.Now().Add(b.timeout)); err != nil {
				return err
			}
		}

		nn, err := b.nc.Read(b.buf[n:])
		n += nn

		switch err {
		case nil:
			if n < need {
				continue
			}
			b.length = n
			return nil

		case io.EOF:
			if n >= need {
				b.length = n
				return nil
			}
			return io.ErrUnexpectedEOF

		default:
			return err
		}
	}
}

// returns next N bytes from buffer.
// The returned slice is only guaranteed to be valid until the next read
func (b *buffer) readNext(need int) ([]byte, error) {
	if b.length < need {
		// refill
		if err := b.fill(need); err != nil {
			return nil, err
		}
	}

	offset := b.idx
	b.idx += need
	b.length -= need
	return b.buf[offset:b.idx], nil
}

// takeBuffer returns a buffer with the requested size.
// If possible, a slice from the existing buffer is returned.
// Otherwise a bigger buffer is made.
// Only one buffer (total) can be used at a time.
func (b *buffer) takeBuffer(length int) ([]byte, error) {
	if b.length > 0 {
		return nil, ErrBusyBuffer
	}

	// test (cheap) general case first
	if length <= cap(b.buf) {
		return b.buf[:length], nil
	}

	if length < maxPacketSize {
		b.buf = make([]byte, length)
		return b.buf, nil
	}

	// buffer is larger than we want to store.
	return make([]byte, length), nil
}

// takeSmallBuffer is shortcut which can be used if length is
// known to be smaller than defaultBufSize.
// Only one buffer (total) can be used at a time.
func (b *buffer) takeSmallBuffer(length int) ([]byte, error) {
	if b.length > 0 {
		return nil, ErrBusyBuffer
	}
	return b.buf[:length], nil
}

// takeCompleteBuffer returns the complete existing buffer.
// This can be used if the necessary buffer size is unknown.
// cap and len of the returned buffer will be equal.
// Only one buffer (total) can be used at a time.
func (b *buffer) takeCompleteBuffer() ([]byte, error) {
	if b.length > 0 {
		return nil, ErrBusyBuffer
	}
	return b.buf, nil
}

// store stores buf, an updated buffer, if its suitable to do so.
func (b *buffer) store(buf []byte) error {
	if b.length > 0 {
		return ErrBusyBuffer
	} else if cap(buf) <= maxPacketSize && cap(buf) > cap(b.buf) {
		b.buf = buf[:cap(buf)]
	}
	return nil
}

A vendor/github.com/go-sql-driver/mysql/collations.go => vendor/github.com/go-sql-driver/mysql/collations.go +265 -0
@@ 0,0 1,265 @@
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2014 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

package mysql

const defaultCollation = "utf8mb4_general_ci"
const binaryCollation = "binary"

// A list of available collations mapped to the internal ID.
// To update this map use the following MySQL query:
//     SELECT COLLATION_NAME, ID FROM information_schema.COLLATIONS WHERE ID<256 ORDER BY ID
//
// Handshake packet have only 1 byte for collation_id.  So we can't use collations with ID > 255.
//
// ucs2, utf16, and utf32 can't be used for connection charset.
// https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html#charset-connection-impermissible-client-charset
// They are commented out to reduce this map.
var collations = map[string]byte{
	"big5_chinese_ci":      1,
	"latin2_czech_cs":      2,
	"dec8_swedish_ci":      3,
	"cp850_general_ci":     4,
	"latin1_german1_ci":    5,
	"hp8_english_ci":       6,
	"koi8r_general_ci":     7,
	"latin1_swedish_ci":    8,
	"latin2_general_ci":    9,
	"swe7_swedish_ci":      10,
	"ascii_general_ci":     11,
	"ujis_japanese_ci":     12,
	"sjis_japanese_ci":     13,
	"cp1251_bulgarian_ci":  14,
	"latin1_danish_ci":     15,
	"hebrew_general_ci":    16,
	"tis620_thai_ci":       18,
	"euckr_korean_ci":      19,
	"latin7_estonian_cs":   20,
	"latin2_hungarian_ci":  21,
	"koi8u_general_ci":     22,
	"cp1251_ukrainian_ci":  23,
	"gb2312_chinese_ci":    24,
	"greek_general_ci":     25,
	"cp1250_general_ci":    26,
	"latin2_croatian_ci":   27,
	"gbk_chinese_ci":       28,
	"cp1257_lithuanian_ci": 29,
	"latin5_turkish_ci":    30,
	"latin1_german2_ci":    31,
	"armscii8_general_ci":  32,
	"utf8_general_ci":      33,
	"cp1250_czech_cs":      34,
	//"ucs2_general_ci":          35,
	"cp866_general_ci":    36,
	"keybcs2_general_ci":  37,
	"macce_general_ci":    38,
	"macroman_general_ci": 39,
	"cp852_general_ci":    40,
	"latin7_general_ci":   41,
	"latin7_general_cs":   42,
	"macce_bin":           43,
	"cp1250_croatian_ci":  44,
	"utf8mb4_general_ci":  45,
	"utf8mb4_bin":         46,
	"latin1_bin":          47,
	"latin1_general_ci":   48,
	"latin1_general_cs":   49,
	"cp1251_bin":          50,
	"cp1251_general_ci":   51,
	"cp1251_general_cs":   52,
	"macroman_bin":        53,
	//"utf16_general_ci":         54,
	//"utf16_bin":                55,
	//"utf16le_general_ci":       56,
	"cp1256_general_ci": 57,
	"cp1257_bin":        58,
	"cp1257_general_ci": 59,
	//"utf32_general_ci":         60,
	//"utf32_bin":                61,
	//"utf16le_bin":              62,
	"binary":          63,
	"armscii8_bin":    64,
	"ascii_bin":       65,
	"cp1250_bin":      66,
	"cp1256_bin":      67,
	"cp866_bin":       68,
	"dec8_bin":        69,
	"greek_bin":       70,
	"hebrew_bin":      71,
	"hp8_bin":         72,
	"keybcs2_bin":     73,
	"koi8r_bin":       74,
	"koi8u_bin":       75,
	"utf8_tolower_ci": 76,
	"latin2_bin":      77,
	"latin5_bin":      78,
	"latin7_bin":      79,
	"cp850_bin":       80,
	"cp852_bin":       81,
	"swe7_bin":        82,
	"utf8_bin":        83,
	"big5_bin":        84,
	"euckr_bin":       85,
	"gb2312_bin":      86,
	"gbk_bin":         87,
	"sjis_bin":        88,
	"tis620_bin":      89,
	//"ucs2_bin":                 90,
	"ujis_bin":            91,
	"geostd8_general_ci":  92,
	"geostd8_bin":         93,
	"latin1_spanish_ci":   94,
	"cp932_japanese_ci":   95,
	"cp932_bin":           96,
	"eucjpms_japanese_ci": 97,
	"eucjpms_bin":         98,
	"cp1250_polish_ci":    99,
	//"utf16_unicode_ci":         101,
	//"utf16_icelandic_ci":       102,
	//"utf16_latvian_ci":         103,
	//"utf16_romanian_ci":        104,
	//"utf16_slovenian_ci":       105,
	//"utf16_polish_ci":          106,
	//"utf16_estonian_ci":        107,
	//"utf16_spanish_ci":         108,
	//"utf16_swedish_ci":         109,
	//"utf16_turkish_ci":         110,
	//"utf16_czech_ci":           111,
	//"utf16_danish_ci":          112,
	//"utf16_lithuanian_ci":      113,
	//"utf16_slovak_ci":          114,
	//"utf16_spanish2_ci":        115,
	//"utf16_roman_ci":           116,
	//"utf16_persian_ci":         117,
	//"utf16_esperanto_ci":       118,
	//"utf16_hungarian_ci":       119,
	//"utf16_sinhala_ci":         120,
	//"utf16_german2_ci":         121,
	//"utf16_croatian_ci":        122,
	//"utf16_unicode_520_ci":     123,
	//"utf16_vietnamese_ci":      124,
	//"ucs2_unicode_ci":          128,
	//"ucs2_icelandic_ci":        129,
	//"ucs2_latvian_ci":          130,
	//"ucs2_romanian_ci":         131,
	//"ucs2_slovenian_ci":        132,
	//"ucs2_polish_ci":           133,
	//"ucs2_estonian_ci":         134,
	//"ucs2_spanish_ci":          135,
	//"ucs2_swedish_ci":          136,
	//"ucs2_turkish_ci":          137,
	//"ucs2_czech_ci":            138,
	//"ucs2_danish_ci":           139,
	//"ucs2_lithuanian_ci":       140,
	//"ucs2_slovak_ci":           141,
	//"ucs2_spanish2_ci":         142,
	//"ucs2_roman_ci":            143,
	//"ucs2_persian_ci":          144,
	//"ucs2_esperanto_ci":        145,
	//"ucs2_hungarian_ci":        146,
	//"ucs2_sinhala_ci":          147,
	//"ucs2_german2_ci":          148,
	//"ucs2_croatian_ci":         149,
	//"ucs2_unicode_520_ci":      150,
	//"ucs2_vietnamese_ci":       151,
	//"ucs2_general_mysql500_ci": 159,
	//"utf32_unicode_ci":         160,
	//"utf32_icelandic_ci":       161,
	//"utf32_latvian_ci":         162,
	//"utf32_romanian_ci":        163,
	//"utf32_slovenian_ci":       164,
	//"utf32_polish_ci":          165,
	//"utf32_estonian_ci":        166,
	//"utf32_spanish_ci":         167,
	//"utf32_swedish_ci":         168,
	//"utf32_turkish_ci":         169,
	//"utf32_czech_ci":           170,
	//"utf32_danish_ci":          171,
	//"utf32_lithuanian_ci":      172,
	//"utf32_slovak_ci":          173,
	//"utf32_spanish2_ci":        174,
	//"utf32_roman_ci":           175,
	//"utf32_persian_ci":         176,
	//"utf32_esperanto_ci":       177,
	//"utf32_hungarian_ci":       178,
	//"utf32_sinhala_ci":         179,
	//"utf32_german2_ci":         180,
	//"utf32_croatian_ci":        181,
	//"utf32_unicode_520_ci":     182,
	//"utf32_vietnamese_ci":      183,
	"utf8_unicode_ci":          192,
	"utf8_icelandic_ci":        193,
	"utf8_latvian_ci":          194,
	"utf8_romanian_ci":         195,
	"utf8_slovenian_ci":        196,
	"utf8_polish_ci":           197,
	"utf8_estonian_ci":         198,
	"utf8_spanish_ci":          199,
	"utf8_swedish_ci":          200,
	"utf8_turkish_ci":          201,
	"utf8_czech_ci":            202,
	"utf8_danish_ci":           203,
	"utf8_lithuanian_ci":       204,
	"utf8_slovak_ci":           205,
	"utf8_spanish2_ci":         206,
	"utf8_roman_ci":            207,
	"utf8_persian_ci":          208,
	"utf8_esperanto_ci":        209,
	"utf8_hungarian_ci":        210,
	"utf8_sinhala_ci":          211,
	"utf8_german2_ci":          212,
	"utf8_croatian_ci":         213,
	"utf8_unicode_520_ci":      214,
	"utf8_vietnamese_ci":       215,
	"utf8_general_mysql500_ci": 223,
	"utf8mb4_unicode_ci":       224,
	"utf8mb4_icelandic_ci":     225,
	"utf8mb4_latvian_ci":       226,
	"utf8mb4_romanian_ci":      227,
	"utf8mb4_slovenian_ci":     228,
	"utf8mb4_polish_ci":        229,
	"utf8mb4_estonian_ci":      230,
	"utf8mb4_spanish_ci":       231,
	"utf8mb4_swedish_ci":       232,
	"utf8mb4_turkish_ci":       233,
	"utf8mb4_czech_ci":         234,
	"utf8mb4_danish_ci":        235,
	"utf8mb4_lithuanian_ci":    236,
	"utf8mb4_slovak_ci":        237,
	"utf8mb4_spanish2_ci":      238,
	"utf8mb4_roman_ci":         239,
	"utf8mb4_persian_ci":       240,
	"utf8mb4_esperanto_ci":     241,
	"utf8mb4_hungarian_ci":     242,
	"utf8mb4_sinhala_ci":       243,
	"utf8mb4_german2_ci":       244,
	"utf8mb4_croatian_ci":      245,
	"utf8mb4_unicode_520_ci":   246,
	"utf8mb4_vietnamese_ci":    247,
	"gb18030_chinese_ci":       248,
	"gb18030_bin":              249,
	"gb18030_unicode_520_ci":   250,
	"utf8mb4_0900_ai_ci":       255,
}

// A blacklist of collations which is unsafe to interpolate parameters.
// These multibyte encodings may contains 0x5c (`\`) in their trailing bytes.
var unsafeCollations = map[string]bool{
	"big5_chinese_ci":        true,
	"sjis_japanese_ci":       true,
	"gbk_chinese_ci":         true,
	"big5_bin":               true,
	"gb2312_bin":             true,
	"gbk_bin":                true,
	"sjis_bin":               true,
	"cp932_japanese_ci":      true,
	"cp932_bin":              true,
	"gb18030_chinese_ci":     true,
	"gb18030_bin":            true,
	"gb18030_unicode_520_ci": true,
}

A vendor/github.com/go-sql-driver/mysql/conncheck.go => vendor/github.com/go-sql-driver/mysql/conncheck.go +54 -0
@@ 0,0 1,54 @@
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2019 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

// +build linux darwin dragonfly freebsd netbsd openbsd solaris illumos

package mysql

import (
	"errors"
	"io"
	"net"
	"syscall"
)

var errUnexpectedRead = errors.New("unexpected read from socket")

func connCheck(conn net.Conn) error {
	var sysErr error

	sysConn, ok := conn.(syscall.Conn)
	if !ok {
		return nil
	}
	rawConn, err := sysConn.SyscallConn()
	if err != nil {
		return err
	}

	err = rawConn.Read(func(fd uintptr) bool {
		var buf [1]byte
		n, err := syscall.Read(int(fd), buf[:])
		switch {
		case n == 0 && err == nil:
			sysErr = io.EOF
		case n > 0:
			sysErr = errUnexpectedRead
		case err == syscall.EAGAIN || err == syscall.EWOULDBLOCK:
			sysErr = nil
		default:
			sysErr = err
		}
		return true
	})
	if err != nil {
		return err
	}

	return sysErr
}

A vendor/github.com/go-sql-driver/mysql/conncheck_dummy.go => vendor/github.com/go-sql-driver/mysql/conncheck_dummy.go +17 -0
@@ 0,0 1,17 @@
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2019 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

// +build !linux,!darwin,!dragonfly,!freebsd,!netbsd,!openbsd,!solaris,!illumos

package mysql

import "net"

func connCheck(conn net.Conn) error {
	return nil
}

A vendor/github.com/go-sql-driver/mysql/connection.go => vendor/github.com/go-sql-driver/mysql/connection.go +651 -0
@@ 0,0 1,651 @@
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

package mysql

import (
	"context"
	"database/sql"
	"database/sql/driver"
	"io"
	"net"
	"strconv"
	"strings"
	"time"
)

type mysqlConn struct {
	buf              buffer
	netConn          net.Conn
	rawConn          net.Conn // underlying connection when netConn is TLS connection.
	affectedRows     uint64
	insertId         uint64
	cfg              *Config
	maxAllowedPacket int
	maxWriteSize     int
	writeTimeout     time.Duration
	flags            clientFlag
	status           statusFlag
	sequence         uint8
	parseTime        bool
	reset            bool // set when the Go SQL package calls ResetSession

	// for context support (Go 1.8+)
	watching bool
	watcher  chan<- context.Context
	closech  chan struct{}
	finished chan<- struct{}
	canceled atomicError // set non-nil if conn is canceled
	closed   atomicBool  // set when conn is closed, before closech is closed
}

// Handles parameters set in DSN after the connection is established
func (mc *mysqlConn) handleParams() (err error) {
	for param, val := range mc.cfg.Params {
		switch param {
		// Charset
		case "charset":
			charsets := strings.Split(val, ",")
			for i := range charsets {
				// ignore errors here - a charset may not exist
				err = mc.exec("SET NAMES " + charsets[i])
				if err == nil {
					break
				}
			}
			if err != nil {
				return
			}

		// System Vars
		default:
			err = mc.exec("SET " + param + "=" + val + "")
			if err != nil {
				return
			}
		}
	}

	return
}

func (mc *mysqlConn) markBadConn(err error) error {
	if mc == nil {
		return err
	}
	if err != errBadConnNoWrite {
		return err
	}
	return driver.ErrBadConn
}

func (mc *mysqlConn) Begin() (driver.Tx, error) {
	return mc.begin(false)
}

func (mc *mysqlConn) begin(readOnly bool) (driver.Tx, error) {
	if mc.closed.IsSet() {
		errLog.Print(ErrInvalidConn)
		return nil, driver.ErrBadConn
	}
	var q string
	if readOnly {
		q = "START TRANSACTION READ ONLY"
	} else {
		q = "START TRANSACTION"
	}
	err := mc.exec(q)
	if err == nil {
		return &mysqlTx{mc}, err
	}
	return nil, mc.markBadConn(err)
}

func (mc *mysqlConn) Close() (err error) {
	// Makes Close idempotent
	if !mc.closed.IsSet() {
		err = mc.writeCommandPacket(comQuit)
	}

	mc.cleanup()

	return
}

// Closes the network connection and unsets internal variables. Do not call this
// function after successfully authentication, call Close instead. This function
// is called before auth or on auth failure because MySQL will have already
// closed the network connection.
func (mc *mysqlConn) cleanup() {
	if !mc.closed.TrySet(true) {
		return
	}

	// Makes cleanup idempotent
	close(mc.closech)
	if mc.netConn == nil {
		return
	}
	if err := mc.netConn.Close(); err != nil {
		errLog.Print(err)
	}
}

func (mc *mysqlConn) error() error {
	if mc.closed.IsSet() {
		if err := mc.canceled.Value(); err != nil {
			return err
		}
		return ErrInvalidConn
	}
	return nil
}

func (mc *mysqlConn) Prepare(query string) (driver.Stmt, error) {
	if mc.closed.IsSet() {
		errLog.Print(ErrInvalidConn)
		return nil, driver.ErrBadConn
	}
	// Send command
	err := mc.writeCommandPacketStr(comStmtPrepare, query)
	if err != nil {
		// STMT_PREPARE is safe to retry.  So we can return ErrBadConn here.
		errLog.Print(err)
		return nil, driver.ErrBadConn
	}

	stmt := &mysqlStmt{
		mc: mc,
	}

	// Read Result
	columnCount, err := stmt.readPrepareResultPacket()
	if err == nil {
		if stmt.paramCount > 0 {
			if err = mc.readUntilEOF(); err != nil {
				return nil, err
			}
		}

		if columnCount > 0 {
			err = mc.readUntilEOF()
		}
	}

	return stmt, err
}

func (mc *mysqlConn) interpolateParams(query string, args []driver.Value) (string, error) {
	// Number of ? should be same to len(args)
	if strings.Count(query, "?") != len(args) {
		return "", driver.ErrSkip
	}

	buf, err := mc.buf.takeCompleteBuffer()
	if err != nil {
		// can not take the buffer. Something must be wrong with the connection
		errLog.Print(err)
		return "", ErrInvalidConn
	}
	buf = buf[:0]
	argPos := 0

	for i := 0; i < len(query); i++ {
		q := strings.IndexByte(query[i:], '?')
		if q == -1 {
			buf = append(buf, query[i:]...)
			break
		}
		buf = append(buf, query[i:i+q]...)
		i += q

		arg := args[argPos]
		argPos++

		if arg == nil {
			buf = append(buf, "NULL"...)
			continue
		}

		switch v := arg.(type) {
		case int64:
			buf = strconv.AppendInt(buf, v, 10)
		case uint64:
			// Handle uint64 explicitly because our custom ConvertValue emits unsigned values
			buf = strconv.AppendUint(buf, v, 10)
		case float64:
			buf = strconv.AppendFloat(buf, v, 'g', -1, 64)
		case bool:
			if v {
				buf = append(buf, '1')
			} else {
				buf = append(buf, '0')
			}
		case time.Time:
			if v.IsZero() {
				buf = append(buf, "'0000-00-00'"...)
			} else {
				v := v.In(mc.cfg.Loc)
				v = v.Add(time.Nanosecond * 500) // To round under microsecond
				year := v.Year()
				year100 := year / 100
				year1 := year % 100
				month := v.Month()
				day := v.Day()
				hour := v.Hour()
				minute := v.Minute()
				second := v.Second()
				micro := v.Nanosecond() / 1000

				buf = append(buf, []byte{
					'\'',
					digits10[year100], digits01[year100],
					digits10[year1], digits01[year1],
					'-',
					digits10[month], digits01[month],
					'-',
					digits10[day], digits01[day],
					' ',
					digits10[hour], digits01[hour],
					':',
					digits10[minute], digits01[minute],
					':',
					digits10[second], digits01[second],
				}...)

				if micro != 0 {
					micro10000 := micro / 10000
					micro100 := micro / 100 % 100
					micro1 := micro % 100
					buf = append(buf, []byte{
						'.',
						digits10[micro10000], digits01[micro10000],
						digits10[micro100], digits01[micro100],
						digits10[micro1], digits01[micro1],
					}...)
				}
				buf = append(buf, '\'')
			}
		case []byte:
			if v == nil {
				buf = append(buf, "NULL"...)
			} else {
				buf = append(buf, "_binary'"...)
				if mc.status&statusNoBackslashEscapes == 0 {
					buf = escapeBytesBackslash(buf, v)
				} else {
					buf = escapeBytesQuotes(buf, v)
				}
				buf = append(buf, '\'')
			}
		case string:
			buf = append(buf, '\'')
			if mc.status&statusNoBackslashEscapes == 0 {
				buf = escapeStringBackslash(buf, v)
			} else {
				buf = escapeStringQuotes(buf, v)
			}
			buf = append(buf, '\'')
		default:
			return "", driver.ErrSkip
		}

		if len(buf)+4 > mc.maxAllowedPacket {
			return "", driver.ErrSkip
		}
	}
	if argPos != len(args) {
		return "", driver.ErrSkip
	}
	return string(buf), nil
}

func (mc *mysqlConn) Exec(query string, args []driver.Value) (driver.Result, error) {
	if mc.closed.IsSet() {
		errLog.Print(ErrInvalidConn)
		return nil, driver.ErrBadConn
	}
	if len(args) != 0 {
		if !mc.cfg.InterpolateParams {
			return nil, driver.ErrSkip
		}
		// try to interpolate the parameters to save extra roundtrips for preparing and closing a statement
		prepared, err := mc.interpolateParams(query, args)
		if err != nil {
			return nil, err
		}
		query = prepared
	}
	mc.affectedRows = 0
	mc.insertId = 0

	err := mc.exec(query)
	if err == nil {
		return &mysqlResult{
			affectedRows: int64(mc.affectedRows),
			insertId:     int64(mc.insertId),
		}, err
	}
	return nil, mc.markBadConn(err)
}

// Internal function to execute commands
func (mc *mysqlConn) exec(query string) error {
	// Send command
	if err := mc.writeCommandPacketStr(comQuery, query); err != nil {
		return mc.markBadConn(err)
	}

	// Read Result
	resLen, err := mc.readResultSetHeaderPacket()
	if err != nil {
		return err
	}

	if resLen > 0 {
		// columns
		if err := mc.readUntilEOF(); err != nil {
			return err
		}

		// rows
		if err := mc.readUntilEOF(); err != nil {
			return err
		}
	}

	return mc.discardResults()
}

func (mc *mysqlConn) Query(query string, args []driver.Value) (driver.Rows, error) {
	return mc.query(query, args)
}

func (mc *mysqlConn) query(query string, args []driver.Value) (*textRows, error) {
	if mc.closed.IsSet() {
		errLog.Print(ErrInvalidConn)
		return nil, driver.ErrBadConn
	}
	if len(args) != 0 {
		if !mc.cfg.InterpolateParams {
			return nil, driver.ErrSkip
		}
		// try client-side prepare to reduce roundtrip
		prepared, err := mc.interpolateParams(query, args)
		if err != nil {
			return nil, err
		}
		query = prepared
	}
	// Send command
	err := mc.writeCommandPacketStr(comQuery, query)
	if err == nil {
		// Read Result
		var resLen int
		resLen, err = mc.readResultSetHeaderPacket()
		if err == nil {
			rows := new(textRows)
			rows.mc = mc

			if resLen == 0 {
				rows.rs.done = true

				switch err := rows.NextResultSet(); err {
				case nil, io.EOF:
					return rows, nil
				default:
					return nil, err
				}
			}

			// Columns
			rows.rs.columns, err = mc.readColumns(resLen)
			return rows, err
		}
	}
	return nil, mc.markBadConn(err)
}

// Gets the value of the given MySQL System Variable
// The returned byte slice is only valid until the next read
func (mc *mysqlConn) getSystemVar(name string) ([]byte, error) {
	// Send command
	if err := mc.writeCommandPacketStr(comQuery, "SELECT @@"+name); err != nil {
		return nil, err
	}

	// Read Result
	resLen, err := mc.readResultSetHeaderPacket()
	if err == nil {
		rows := new(textRows)
		rows.mc = mc
		rows.rs.columns = []mysqlField{{fieldType: fieldTypeVarChar}}

		if resLen > 0 {
			// Columns
			if err := mc.readUntilEOF(); err != nil {
				return nil, err
			}
		}

		dest := make([]driver.Value, resLen)
		if err = rows.readRow(dest); err == nil {
			return dest[0].([]byte), mc.readUntilEOF()
		}
	}
	return nil, err
}

// finish is called when the query has canceled.
func (mc *mysqlConn) cancel(err error) {
	mc.canceled.Set(err)
	mc.cleanup()
}

// finish is called when the query has succeeded.
func (mc *mysqlConn) finish() {
	if !mc.watching || mc.finished == nil {
		return
	}
	select {
	case mc.finished <- struct{}{}:
		mc.watching = false
	case <-mc.closech:
	}
}

// Ping implements driver.Pinger interface
func (mc *mysqlConn) Ping(ctx context.Context) (err error) {
	if mc.closed.IsSet() {
		errLog.Print(ErrInvalidConn)
		return driver.ErrBadConn
	}

	if err = mc.watchCancel(ctx); err != nil {
		return
	}
	defer mc.finish()

	if err = mc.writeCommandPacket(comPing); err != nil {
		return mc.markBadConn(err)
	}

	return mc.readResultOK()
}

// BeginTx implements driver.ConnBeginTx interface
func (mc *mysqlConn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
	if err := mc.watchCancel(ctx); err != nil {
		return nil, err
	}
	defer mc.finish()

	if sql.IsolationLevel(opts.Isolation) != sql.LevelDefault {
		level, err := mapIsolationLevel(opts.Isolation)
		if err != nil {
			return nil, err
		}
		err = mc.exec("SET TRANSACTION ISOLATION LEVEL " + level)
		if err != nil {
			return nil, err
		}
	}

	return mc.begin(opts.ReadOnly)
}

func (mc *mysqlConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
	dargs, err := namedValueToValue(args)
	if err != nil {
		return nil, err
	}

	if err := mc.watchCancel(ctx); err != nil {
		return nil, err
	}

	rows, err := mc.query(query, dargs)
	if err != nil {
		mc.finish()
		return nil, err
	}
	rows.finish = mc.finish
	return rows, err
}

func (mc *mysqlConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
	dargs, err := namedValueToValue(args)
	if err != nil {
		return nil, err
	}

	if err := mc.watchCancel(ctx); err != nil {
		return nil, err
	}
	defer mc.finish()

	return mc.Exec(query, dargs)
}

func (mc *mysqlConn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
	if err := mc.watchCancel(ctx); err != nil {
		return nil, err
	}

	stmt, err := mc.Prepare(query)
	mc.finish()
	if err != nil {
		return nil, err
	}

	select {
	default:
	case <-ctx.Done():
		stmt.Close()
		return nil, ctx.Err()
	}
	return stmt, nil
}

func (stmt *mysqlStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
	dargs, err := namedValueToValue(args)
	if err != nil {
		return nil, err
	}

	if err := stmt.mc.watchCancel(ctx); err != nil {
		return nil, err
	}

	rows, err := stmt.query(dargs)
	if err != nil {
		stmt.mc.finish()
		return nil, err
	}
	rows.finish = stmt.mc.finish
	return rows, err
}

func (stmt *mysqlStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
	dargs, err := namedValueToValue(args)
	if err != nil {
		return nil, err
	}

	if err := stmt.mc.watchCancel(ctx); err != nil {
		return nil, err
	}
	defer stmt.mc.finish()

	return stmt.Exec(dargs)
}

func (mc *mysqlConn) watchCancel(ctx context.Context) error {
	if mc.watching {
		// Reach here if canceled,
		// so the connection is already invalid
		mc.cleanup()
		return nil
	}
	// When ctx is already cancelled, don't watch it.
	if err := ctx.Err(); err != nil {
		return err
	}
	// When ctx is not cancellable, don't watch it.
	if ctx.Done() == nil {
		return nil
	}
	// When watcher is not alive, can't watch it.
	if mc.watcher == nil {
		return nil
	}

	mc.watching = true
	mc.watcher <- ctx
	return nil
}

func (mc *mysqlConn) startWatcher() {
	watcher := make(chan context.Context, 1)
	mc.watcher = watcher
	finished := make(chan struct{})
	mc.finished = finished
	go func() {
		for {
			var ctx context.Context
			select {
			case ctx = <-watcher:
			case <-mc.closech:
				return
			}

			select {
			case <-ctx.Done():
				mc.cancel(ctx.Err())
			case <-finished:
			case <-mc.closech:
				return
			}
		}
	}()
}

func (mc *mysqlConn) CheckNamedValue(nv *driver.NamedValue) (err error) {
	nv.Value, err = converter{}.ConvertValue(nv.Value)
	return
}

// ResetSession implements driver.SessionResetter.
// (From Go 1.10)
func (mc *mysqlConn) ResetSession(ctx context.Context) error {
	if mc.closed.IsSet() {
		return driver.ErrBadConn
	}
	mc.reset = true
	return nil
}

A vendor/github.com/go-sql-driver/mysql/connector.go => vendor/github.com/go-sql-driver/mysql/connector.go +146 -0
@@ 0,0 1,146 @@
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2018 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

package mysql

import (
	"context"
	"database/sql/driver"
	"net"
)

type connector struct {
	cfg *Config // immutable private copy.
}

// Connect implements driver.Connector interface.
// Connect returns a connection to the database.
func (c *connector) Connect(ctx context.Context) (driver.Conn, error) {
	var err error

	// New mysqlConn
	mc := &mysqlConn{
		maxAllowedPacket: maxPacketSize,
		maxWriteSize:     maxPacketSize - 1,
		closech:          make(chan struct{}),
		cfg:              c.cfg,
	}
	mc.parseTime = mc.cfg.ParseTime

	// Connect to Server
	dialsLock.RLock()
	dial, ok := dials[mc.cfg.Net]
	dialsLock.RUnlock()
	if ok {
		dctx := ctx
		if mc.cfg.Timeout > 0 {
			var cancel context.CancelFunc
			dctx, cancel = context.WithTimeout(ctx, c.cfg.Timeout)
			defer cancel()
		}
		mc.netConn, err = dial(dctx, mc.cfg.Addr)
	} else {
		nd := net.Dialer{Timeout: mc.cfg.Timeout}
		mc.netConn, err = nd.DialContext(ctx, mc.cfg.Net, mc.cfg.Addr)
	}

	if err != nil {
		return nil, err
	}

	// Enable TCP Keepalives on TCP connections
	if tc, ok := mc.netConn.(*net.TCPConn); ok {
		if err := tc.SetKeepAlive(true); err != nil {
			// Don't send COM_QUIT before handshake.
			mc.netConn.Close()
			mc.netConn = nil
			return nil, err
		}
	}

	// Call startWatcher for context support (From Go 1.8)
	mc.startWatcher()
	if err := mc.watchCancel(ctx); err != nil {
		mc.cleanup()
		return nil, err
	}
	defer mc.finish()

	mc.buf = newBuffer(mc.netConn)

	// Set I/O timeouts
	mc.buf.timeout = mc.cfg.ReadTimeout
	mc.writeTimeout = mc.cfg.WriteTimeout

	// Reading Handshake Initialization Packet
	authData, plugin, err := mc.readHandshakePacket()
	if err != nil {
		mc.cleanup()
		return nil, err
	}

	if plugin == "" {
		plugin = defaultAuthPlugin
	}

	// Send Client Authentication Packet
	authResp, err := mc.auth(authData, plugin)
	if err != nil {
		// try the default auth plugin, if using the requested plugin failed
		errLog.Print("could not use requested auth plugin '"+plugin+"': ", err.Error())
		plugin = defaultAuthPlugin
		authResp, err = mc.auth(authData, plugin)
		if err != nil {
			mc.cleanup()
			return nil, err
		}
	}
	if err = mc.writeHandshakeResponsePacket(authResp, plugin); err != nil {
		mc.cleanup()
		return nil, err
	}

	// Handle response to auth packet, switch methods if possible
	if err = mc.handleAuthResult(authData, plugin); err != nil {
		// Authentication failed and MySQL has already closed the connection
		// (https://dev.mysql.com/doc/internals/en/authentication-fails.html).
		// Do not send COM_QUIT, just cleanup and return the error.
		mc.cleanup()
		return nil, err
	}

	if mc.cfg.MaxAllowedPacket > 0 {
		mc.maxAllowedPacket = mc.cfg.MaxAllowedPacket
	} else {
		// Get max allowed packet size
		maxap, err := mc.getSystemVar("max_allowed_packet")
		if err != nil {
			mc.Close()
			return nil, err
		}
		mc.maxAllowedPacket = stringToInt(maxap) - 1
	}
	if mc.maxAllowedPacket < maxPacketSize {
		mc.maxWriteSize = mc.maxAllowedPacket
	}

	// Handle DSN Params
	err = mc.handleParams()
	if err != nil {
		mc.Close()
		return nil, err
	}

	return mc, nil
}

// Driver implements driver.Connector interface.
// Driver returns &MySQLDriver{}.
func (c *connector) Driver() driver.Driver {
	return &MySQLDriver{}
}

A vendor/github.com/go-sql-driver/mysql/const.go => vendor/github.com/go-sql-driver/mysql/const.go +174 -0
@@ 0,0 1,174 @@
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

package mysql

const (
	defaultAuthPlugin       = "mysql_native_password"
	defaultMaxAllowedPacket = 4 << 20 // 4 MiB
	minProtocolVersion      = 10
	maxPacketSize           = 1<<24 - 1
	timeFormat              = "2006-01-02 15:04:05.999999"
)

// MySQL constants documentation:
// http://dev.mysql.com/doc/internals/en/client-server-protocol.html

const (
	iOK           byte = 0x00
	iAuthMoreData byte = 0x01
	iLocalInFile  byte = 0xfb
	iEOF          byte = 0xfe
	iERR          byte = 0xff
)

// https://dev.mysql.com/doc/internals/en/capability-flags.html#packet-Protocol::CapabilityFlags
type clientFlag uint32

const (
	clientLongPassword clientFlag = 1 << iota
	clientFoundRows