~evanj/evanjon.es

ref: 1945c2ac2ace3de4f3819301989cc88af79a0b5b evanjon.es/internal/s/cms/cms.go -rw-r--r-- 5.4 KiB
1945c2acEvan M Jones Feat(cms update): Updating evanjon.es cms usage per cms updates on tip. 1 year, 6 months ago
                                                                                
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package cms

import (
	"context"
	"errors"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"strconv"
	"sync"
	"time"

	i "git.sr.ht/~evanj/evanjon.es/internal/m/content"
	orig "git.sr.ht/~evanj/evanjon.es/pkg/cms"
)

var (
	ErrNoValue = errors.New("content does not have all required fields")
)

type CMS struct {
	provider      provider
	log           *log.Logger
	cacheSecret   string
	dumbListCache sync.Map
	dumbFindCache sync.Map
}

type Content struct {
	name, slug, category, short, desc string
	tags                              []string
	published                         time.Time
	hasImage                          bool
	imageURL                          string
	typ                               int
}

type provider interface {
	Find(ctx context.Context, typeID int, field, query string) (*orig.Content, error)
	List(ctx context.Context, typeID int, order, field string) ([]orig.Content, error)
}

func New(log *log.Logger, cms provider, cacheSecret string) *CMS {
	return &CMS{
		cms,
		log,
		cacheSecret,
		sync.Map{},
		sync.Map{},
	}
}

/*****************
 * Cache things. *
 *****************/

func (cms *CMS) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// Clear caches.

	if cms.cacheSecret != r.FormValue("secret") {
		w.WriteHeader(http.StatusForbidden)
		w.Write([]byte("you cannot do this"))
		cms.log.Println("cache has failed to clear, no valid secret")
		return
	}

	cms.breakcache()

	w.WriteHeader(http.StatusOK)
	w.Write([]byte("cache has been cleared"))

	cms.log.Println("cache has been cleared")
}

func (cms *CMS) breakcache() {
	cms.dumbFindCache.Range(func(key, val interface{}) bool {
		cms.dumbFindCache.Delete(key)
		return true
	})
	cms.dumbListCache.Range(func(key, val interface{}) bool {
		cms.dumbListCache.Delete(key)
		return true
	})
}

/*********************
 * Data/type things. *
 *********************/

func (cms *CMS) transform(in *orig.Content) (*Content, error) {
	getstr := func(key string) (string, error) {
		for _, item := range in.ContentValues {
			if item.FieldName == key {
				return item.FieldValue, nil
			}
		}
		return "", ErrNoValue
	}

	getdate := func(key string) (niltime time.Time, err error) {
		str, err := getstr(key)
		if err != nil {
			return niltime, err
		}

		t, err := time.Parse("2006-01-02", str)
		if err != nil {
			return niltime, err
		}

		return t, nil
	}

	name, err := getstr("name")
	if err != nil {
		return nil, err
	}

	slug, err := getstr("slug")
	if err != nil {
		return nil, err
	}

	short, err := getstr("short")
	if err != nil {
		return nil, err
	}

	desc, err := getstr("desc")
	if err != nil {
		return nil, err
	}

	publishDate, err := getdate("date")
	if err != nil {
		return nil, err
	}

	typ, err := strconv.Atoi(in.ContentParentTypeID)
	if err != nil {
		return nil, err
	}

	// imageURL, err := getstr("image")
	// if err != nil {
	// 	return nil, err
	// }

	out := &Content{
		name:      name,
		slug:      slug,
		short:     short,
		desc:      desc,
		published: publishDate,
		typ:       typ,
		// hasImage:  imageURL != "",
		// imageURL:  imageURL,
		// // TODO: Reference, ReferenceList
		// category: "",
		// tags:     []string{},
	}

	return out, nil
}

/**********
 * Finder *
 **********/

func (cms *CMS) find(ctx context.Context, typeID int, field, query string) (*Content, error) {
	in, err := cms.provider.Find(ctx, typeID, field, query)
	if err != nil {
		return nil, err
	}
	return cms.transform(in)
}

func (cms *CMS) Find(ctx context.Context, typeID int, field, query string) (i.Content, error) {
	key := fmt.Sprintf("item::%s::%s", field, query)

	inter, ok := cms.dumbFindCache.Load(key)
	if ok {
		item, ok := inter.(*Content)
		if ok {
			return item, nil
		}
	}

	item, err := cms.find(ctx, typeID, field, query)
	if err != nil {
		return nil, err
	}

	cms.dumbFindCache.Store(key, item)
	return item, nil

}

/**********
 * Lister *
 **********/

func (cms *CMS) list(ctx context.Context, typeID int) ([]*Content, error) {
	l, err := cms.provider.List(ctx, typeID, "desc", "date")
	if err != nil {
		return nil, err
	}

	var list []*Content

	for _, i := range l {
		c, err := cms.transform(&i)
		if err != nil {
			return nil, err
		}

		list = append(list, c)
	}

	return list, nil
}

func (cms *CMS) List(ctx context.Context, typeID int) (ret []i.Content, e error) {
	key := fmt.Sprintf("list::%d", typeID)

	transform := func(in []*Content) (out []i.Content) {
		for _, item := range in {
			out = append(out, item)
		}
		return out
	}

	inter, ok := cms.dumbListCache.Load(key)
	if ok {
		l, ok := inter.([]*Content)
		if ok {
			return transform(l), nil
		}
	}

	l, err := cms.list(ctx, typeID)
	if err != nil {
		return nil, err
	}

	cms.dumbListCache.Store(key, l)
	return transform(l), nil
}

/*******************
 * Interface impl. *
 *******************/

func (c *Content) Name() string {
	return c.name
}

func (c *Content) Slug() string {
	return c.slug
}

func (c *Content) Date() time.Time {
	return c.published
}

func (c *Content) PrettyDate() string {
	return c.published.Format("Jan 2, 2006")
}

func (c *Content) Category() string {
	return c.category
}

func (c *Content) Tags() []string {
	return c.tags
}

func (c *Content) HasImage() bool {
	return c.hasImage
}

func (c *Content) Image() (URL string) {
	return c.imageURL
}

func (c *Content) Short() (shortDescription string) {
	return c.short
}

func (c *Content) Desc() template.HTML {
	return template.HTML(c.desc)
}

func (c *Content) Type() int {
	return c.typ
}