~egtann/srp

65c47252b1325a882e1e8f5a3317a9817b3ba68f — Evan Tann 2 years ago 650ff41
add logger.ReqPrintf to attach request id to logs
6 files changed, 214 insertions(+), 74 deletions(-)

M cmd/srp/main.go
M cmd/srp_gcloud/main.go
M gcloud/cache/cache.go
M go.mod
M go.sum
M proxy.go
M cmd/srp/main.go => cmd/srp/main.go +5 -5
@@ 55,7 55,7 @@ func main() {
		os.Exit(1)
	}
	rand.Seed(time.Now().UnixNano())
	proxy := srp.NewProxy(&Logger{}, reg)
	proxy := srp.NewProxy(&logger{}, reg)

	srv := &http.Server{
		Handler:        proxy,


@@ 71,7 71,7 @@ func main() {
			HostPolicy: autocert.HostWhitelist(hosts...),
		}
		getCert := func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
			log.Printf("get cert for %s\n", hello.ServerName)
			log.Printf("get cert for %s", hello.ServerName)
			cert, err := m.GetCertificate(hello)
			if err != nil {
				log.Println("failed to get cert:", err)


@@ 111,10 111,10 @@ func main() {
	gracefulRestart(srv, timeout)
}

// Logger implements the srp.Logger interface.
type Logger struct{}
// logger implements the srp.Logger interface.
type logger struct{}

func (l *Logger) Printf(format string, vals ...interface{}) {
func (l *logger) Printf(format string, vals ...interface{}) {
	log.Printf(format, vals...)
}


M cmd/srp_gcloud/main.go => cmd/srp_gcloud/main.go +50 -31
@@ 5,7 5,6 @@ import (
	"crypto/tls"
	"flag"
	"fmt"
	"log"
	"math/rand"
	"net/http"
	"net/url"


@@ 18,6 17,7 @@ import (

	"github.com/egtann/srp"
	"github.com/egtann/srp/gcloud/cache"
	"github.com/rs/zerolog"
	"golang.org/x/crypto/acme/autocert"
)



@@ 60,8 60,12 @@ func main() {
		os.Exit(1)
	}
	rand.Seed(time.Now().UnixNano())
	proxy := srp.NewProxy(&Logger{}, reg)

	zerolog.TimeFieldFormat = "" // Unix format
	zerolog.TimestampFieldName = "ts"
	zerolog.MessageFieldName = "msg"
	log := zerolog.New(os.Stdout).With().Timestamp().Logger()
	proxy := srp.NewProxy(&logger{log: log}, reg)
	srv := &http.Server{
		Handler:        proxy,
		ReadTimeout:    timeout,


@@ 70,10 74,10 @@ func main() {
	}
	if len(*sslURL) > 0 {
		hosts := append(reg.Hosts(), selfURL.Host)
		log.Println("hosts", hosts)
		c, err := cache.New(*bucket)
		log.Info().Strs("hosts", hosts).Msg("got hosts")
		c, err := cache.New(log, *bucket)
		if err != nil {
			log.Fatalf("new cache: %s", err)
			log.Fatal().Err(err).Msg("new cache")
		}
		m := &autocert.Manager{
			Cache:      c,


@@ 81,10 85,10 @@ func main() {
			HostPolicy: autocert.HostWhitelist(hosts...),
		}
		getCert := func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
			log.Printf("get cert for %s\n", hello.ServerName)
			// log.Info().Str("server", hello.ServerName).Msg("get cert")
			cert, err := m.GetCertificate(hello)
			if err != nil {
				log.Println("failed to get cert:", err)
				log.Info().Err(err).Msg("failed to get cert")
			}
			return cert, err
		}


@@ 92,46 96,56 @@ func main() {
		go func() {
			err = http.ListenAndServe(":http", m.HTTPHandler(nil))
			if err != nil {
				log.Fatal(fmt.Printf("listen and serve: %s", err))
				log.Fatal().Err(err).Msg("listen and serve http")
			}
		}()
		port = "443"
		srv.Addr = ":https"
		go func() {
			log.Println("serving tls")
			log.Info().Msg("serving tls")
			if err = srv.ListenAndServeTLS("", ""); err != nil {
				log.Fatalln(err)
				log.Fatal().Err(err).Msg("listen and serve tls")
			}
		}()
	} else {
		srv.Addr = ":" + port
		go func() {
			if err = srv.ListenAndServe(); err != nil {
				log.Fatalln(err)
				log.Fatal().Err(err).Msg("listen and serve")
			}
		}()
	}
	log.Println("listening on", port)
	log.Info().Str("port", port).Msg("listening")
	if err = proxy.CheckHealth(); err != nil {
		log.Println("check health", err)
		log.Info().Err(err).Msg("check health")
	}
	sighupCh := make(chan bool)
	go hotReloadConfig(*config, proxy, sighupCh)
	go checkHealth(proxy, sighupCh)
	gracefulRestart(srv, timeout)
	go hotReloadConfig(log, *config, proxy, sighupCh)
	go checkHealth(log, proxy, sighupCh)
	gracefulRestart(log, srv, timeout)
}

// Logger implements the srp.Logger interface.
type Logger struct{}
// logger implements the srp.Logger interface.
type logger struct {
	log zerolog.Logger
}

func (l *logger) Printf(format string, vals ...interface{}) {
	l.log.Info().Msgf(format, vals...)
}

func (l *Logger) Printf(format string, vals ...interface{}) {
	log.Printf(format, vals...)
func (l *logger) ReqPrintf(reqID, format string, vals ...interface{}) {
	l.log.Info().Str("req_id", reqID).Msgf(format, vals...)
}

// checkHealth of backend servers constantly. We cancel the current health
// check when the reloaded channel receives a message, so a new health check
// with the new registry can be started.
func checkHealth(proxy *srp.ReverseProxy, sighupCh <-chan bool) {
func checkHealth(
	log zerolog.Logger,
	proxy *srp.ReverseProxy,
	sighupCh <-chan bool,
) {
	ticker := time.NewTicker(3 * time.Second)
	defer ticker.Stop()
	for {


@@ 139,7 153,7 @@ func checkHealth(proxy *srp.ReverseProxy, sighupCh <-chan bool) {
		case <-ticker.C:
			err := proxy.CheckHealth()
			if err != nil {
				log.Println("check health", err)
				log.Info().Err(err).Msg("check health")
			}
		case <-sighupCh:
			return


@@ 151,6 165,7 @@ func checkHealth(proxy *srp.ReverseProxy, sighupCh <-chan bool) {
// registry from the config file. This recursively calls itself, so it can
// handle the signal multiple times.
func hotReloadConfig(
	log zerolog.Logger,
	filename string,
	proxy *srp.ReverseProxy,
	sighupCh chan bool,


@@ 158,34 173,38 @@ func hotReloadConfig(
	stop := make(chan os.Signal, 1)
	signal.Notify(stop, syscall.SIGHUP)
	<-stop
	log.Println("reloading config...")
	log.Info().Msg("reloading config...")
	reg, err := srp.NewRegistry(filename)
	if err != nil {
		log.Fatal(err)
		log.Fatal().Err(err).Msg("reload registry")
	}
	proxy.UpdateRegistry(reg)
	log.Println("reloaded config")
	log.Info().Msg("reloaded config")
	sighupCh <- true
	go checkHealth(proxy, sighupCh)
	hotReloadConfig(filename, proxy, sighupCh)
	go checkHealth(log, proxy, sighupCh)
	hotReloadConfig(log, filename, proxy, sighupCh)
}

// gracefulRestart listens for an interupt or terminate signal. When either is
// received, it stops accepting new connections and allows all existing
// connections up to 10 seconds to complete. If connections do not shut down in
// time, this exits with 1.
func gracefulRestart(srv *http.Server, timeout time.Duration) {
func gracefulRestart(
	log zerolog.Logger,
	srv *http.Server,
	timeout time.Duration,
) {
	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
	<-stop
	log.Println("shutting down...")
	log.Info().Msg("shutting down...")
	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		log.Println("failed to shutdown server gracefully", err)
		log.Info().Err(err).Msg("failed to shutdown server gracefully")
		os.Exit(1)
	}
	log.Println("shut down")
	log.Info().Msg("shut down")
}

func usage(issues []string) {

M gcloud/cache/cache.go => gcloud/cache/cache.go +13 -9
@@ 9,9 9,9 @@ package cache
import (
	"context"
	"io/ioutil"
	"log"

	"cloud.google.com/go/storage"
	"github.com/rs/zerolog"
	"golang.org/x/crypto/acme/autocert"
)



@@ 19,11 19,12 @@ import (
type Cache struct {
	client *storage.Client
	bucket string
	log    zerolog.Logger
}

// New creates and initializes a new Cache backed by the given Google Cloud
// Storage bucket.
func New(bucket string) (*Cache, error) {
func New(log zerolog.Logger, bucket string) (*Cache, error) {
	client, err := storage.NewClient(context.Background())
	if err != nil {
		return nil, err


@@ 31,30 32,32 @@ func New(bucket string) (*Cache, error) {
	c := &Cache{
		client: client,
		bucket: bucket,
		log:    log,
	}
	return c, nil
}

// Get certificate data from the specified object name.
func (c *Cache) Get(ctx context.Context, name string) ([]byte, error) {
	log.Println("get", name)
	clog := c.log.With().Str("name", name).Logger()
	// clog.Info().Msg("get cert")
	r, err := c.client.Bucket(c.bucket).Object(name).NewReader(ctx)
	if err == storage.ErrObjectNotExist {
		log.Println("cache miss")
		clog.Info().Msg("cache miss")
		return nil, autocert.ErrCacheMiss
	}
	if err != nil {
		log.Println("got err", err)
		clog.Info().Err(err).Msg("failed to get cert")
		return nil, err
	}
	log.Println("reading cert")
	// clog.Info().Msg("reading cert")
	defer r.Close()
	return ioutil.ReadAll(r)
}

// Put the certificate data to the specified object name.
func (c *Cache) Put(ctx context.Context, name string, data []byte) error {
	log.Println("putting cert", name)
	c.log.Info().Str("name", name).Msg("putting cert")
	w := c.client.Bucket(c.bucket).Object(name).NewWriter(ctx)
	w.Write(data)
	return w.Close()


@@ 62,11 65,12 @@ func (c *Cache) Put(ctx context.Context, name string, data []byte) error {

// Delete the specified object name.
func (c *Cache) Delete(ctx context.Context, name string) error {
	log.Println("deleting cert", name)
	clog := c.log.With().Str("name", name).Logger()
	clog.Info().Msg("deleting cert")
	o := c.client.Bucket(c.bucket).Object(name)
	err := o.Delete(ctx)
	if err == storage.ErrObjectNotExist {
		log.Println("cert does not exist")
		clog.Info().Msg("cert does not exist")
		return nil
	}
	return err

M go.mod => go.mod +10 -13
@@ 1,17 1,14 @@
module github.com/egtann/srp

require (
	cloud.google.com/go v0.34.0
	github.com/google/martian v2.1.0+incompatible // indirect
	github.com/googleapis/gax-go v2.0.2+incompatible // indirect
	go.opencensus.io v0.18.0 // indirect
	golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9
	golang.org/x/net v0.0.0-20181220203305-927f97764cc3 // indirect
	golang.org/x/oauth2 v0.0.0-20181203162652-d668ce993890 // indirect
	golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 // indirect
	golang.org/x/sys v0.0.0-20181221143128-b4a75ba826a6 // indirect
	google.golang.org/api v0.0.0-20181221000618-65a46cafb132 // indirect
	google.golang.org/appengine v1.4.0 // indirect
	google.golang.org/genproto v0.0.0-20181221175505-bd9b4fb69e2f // indirect
	google.golang.org/grpc v1.17.0 // indirect
	cloud.google.com/go v0.35.1
	github.com/rs/xid v1.2.1
	github.com/rs/zerolog v1.11.0
	go.opencensus.io v0.19.0 // indirect
	golang.org/x/crypto v0.0.0-20190123085648-057139ce5d2b
	golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3 // indirect
	golang.org/x/oauth2 v0.0.0-20190115181402-5dab4167f31c // indirect
	golang.org/x/sys v0.0.0-20190124100055-b90733256f2e // indirect
	google.golang.org/genproto v0.0.0-20190127220909-aa24cbd621fe // indirect
	google.golang.org/grpc v1.18.0 // indirect
)

M go.sum => go.sum +128 -12
@@ 1,72 1,188 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0 h1:eOI3/cP2VTU6uZLDYAoic+eyzzB9YyGmJ7eIjl8rOPg=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.35.1 h1:LMe/Btq0Eijsc97JyBwMc0KMXOe0orqAMdg7/EkywN8=
cloud.google.com/go v0.35.1/go.mod h1:wfjPZNvXCBYESy3fIynybskMP48KVPrjSPCnXiK7Prg=
dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU=
dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
git.apache.org/thrift.git v0.0.0-20181218151757-9b75e4fe745a/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
github.com/google/martian v2.1.0+incompatible h1:/CP5g8u/VJHijgedC/Legn3BAbAaWPgecwXBIDzw5no=
github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
github.com/googleapis/gax-go v2.0.2+incompatible h1:silFMLAnr330+NRuag/VjIGF7TLp/LBrV2CJKFLWEww=
github.com/googleapis/gax-go v2.0.2+incompatible/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY=
github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
github.com/googleapis/gax-go v2.0.0+incompatible h1:j0GKcs05QVmm7yesiZq2+9cxHkNK9YM6zKx4D2qucQU=
github.com/googleapis/gax-go v2.0.0+incompatible/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY=
github.com/googleapis/gax-go/v2 v2.0.3 h1:siORttZ36U2R/WjiJuDz8znElWBiAlO9rVt+mqJt0Cc=
github.com/googleapis/gax-go/v2 v2.0.3/go.mod h1:LLvjysVCY1JZeum8Z6l8qUty8fiNwE08qbEPm1M08qg=
github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=
github.com/grpc-ecosystem/grpc-gateway v1.5.0/go.mod h1:RSKVYQBd5MCa4OVpNdGskqpgL2+G+NZTnrVHpWWfpdw=
github.com/grpc-ecosystem/grpc-gateway v1.6.2/go.mod h1:RSKVYQBd5MCa4OVpNdGskqpgL2+G+NZTnrVHpWWfpdw=
github.com/jellevandenhooff/dkim v0.0.0-20150330215556-f50fe3d243e1/go.mod h1:E0B/fFc00Y+Rasa88328GlI/XbtyysCtTHZS8h7IrBU=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/pty v1.1.3/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
github.com/microcosm-cc/bluemonday v1.0.1/go.mod h1:hsXNsILzKxV+sX77C5b8FSuKF00vh2OMYv+xgHpAMF4=
github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86/go.mod h1:kHJEU3ofeGjhHklVoIGuVj85JJwZ6kWPaJwCIxgnFmo=
github.com/neelance/sourcemap v0.0.0-20151028013722-8c68805598ab/go.mod h1:Qr6/a/Q4r9LP1IltGz7tA7iOK1WonHEYhu1HRBA7ZiM=
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golang.org/x/sys v0.0.0-20190124100055-b90733256f2e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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google.golang.org/api v0.1.0/go.mod h1:UGEZY7KEX120AnNLIHFMKIo4obdJhkp2tPbaPlQx13Y=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.3.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
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google.golang.org/genproto v0.0.0-20181221175505-bd9b4fb69e2f/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg=
google.golang.org/genproto v0.0.0-20181029155118-b69ba1387ce2/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg=
google.golang.org/genproto v0.0.0-20181219182458-5a97ab628bfb/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg=
google.golang.org/genproto v0.0.0-20190122154452-ba6ebe99b011/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg=
google.golang.org/genproto v0.0.0-20190127220909-aa24cbd621fe h1:riOc7c4/YdwaQL2EnsMmZFANw2Ca9jhIK96t3LHRA1A=
google.golang.org/genproto v0.0.0-20190127220909-aa24cbd621fe/go.mod h1:L3J43x8/uS+qIUoksaLKe6OS3nUKxOKuIFz1sl2/jx4=
google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
google.golang.org/grpc v1.17.0 h1:TRJYBgMclJvGYn2rIMjj+h9KtMt5r1Ij7ODVRIZkwhk=
google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
google.golang.org/grpc v1.18.0 h1:IZl7mfBGfbhYx2p2rKRtYgDFw6SBz+kclmxYrCksPPA=
google.golang.org/grpc v1.18.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20180920025451-e3ad64cb4ed3/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

M proxy.go => proxy.go +8 -4
@@ 4,13 4,14 @@ import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"math/rand"
	"net"
	"net/http"
	"net/http/httputil"
	"sync"
	"time"

	"github.com/rs/xid"
)

// ReverseProxy maps frontend hosts to backends. If HealthPath is set in the


@@ 40,6 41,7 @@ type backend struct {
// returning, i.e. the logging itself constitutes handling the error.
type Logger interface {
	Printf(format string, vals ...interface{})
	ReqPrintf(reqID, format string, vals ...interface{})
}

type healthCheck struct {


@@ 55,7 57,9 @@ func NewProxy(log Logger, reg Registry) *ReverseProxy {
		req.URL.Scheme = "http"
		req.URL.Host = req.Host
		req.Header.Set("X-Real-IP", req.RemoteAddr)
		log.Printf("%s requested %s %s", req.RemoteAddr, req.Method, req.Host)
		reqID := xid.New().String()
		req.Header.Set("X-Request-ID", reqID)
		log.ReqPrintf(reqID, "%s requested %s %s", req.RemoteAddr, req.Method, req.Host)
	}
	transport := newTransport(reg)
	errorHandler := func(w http.ResponseWriter, r *http.Request, err error) {


@@ 168,12 172,12 @@ func (r *ReverseProxy) CheckHealth() error {
	for i := 0; i < len(checks); i++ {
		check := <-r.resultCh
		if check.err != nil {
			log.Printf("check health: %s failed: %s\n", check.ip, check.err)
			r.log.Printf("check health: %s failed: %s", check.ip, check.err)
			continue
		}
		host := regClone[check.host]
		host.liveBackends = append(host.liveBackends, check.ip)
		log.Printf("check health: %s 200 OK\n", check.ip)
		r.log.Printf("check health: %s 200 OK", check.ip)
	}
	r.UpdateRegistry(regClone)
	return nil