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dockerregistry.go
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dockerregistry.go
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package dockerregistry
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"time"
log "github.com/Sirupsen/logrus"
gorillahandlers "github.com/gorilla/handlers"
"github.com/Sirupsen/logrus/formatters/logstash"
"github.com/docker/distribution/configuration"
"github.com/docker/distribution/context"
"github.com/docker/distribution/health"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/auth"
"github.com/docker/distribution/registry/handlers"
"github.com/docker/distribution/uuid"
"github.com/docker/distribution/version"
_ "github.com/docker/distribution/registry/auth/htpasswd"
_ "github.com/docker/distribution/registry/auth/token"
_ "github.com/docker/distribution/registry/proxy"
_ "github.com/docker/distribution/registry/storage/driver/azure"
_ "github.com/docker/distribution/registry/storage/driver/filesystem"
_ "github.com/docker/distribution/registry/storage/driver/gcs"
_ "github.com/docker/distribution/registry/storage/driver/inmemory"
_ "github.com/docker/distribution/registry/storage/driver/middleware/cloudfront"
_ "github.com/docker/distribution/registry/storage/driver/oss"
_ "github.com/docker/distribution/registry/storage/driver/s3"
_ "github.com/docker/distribution/registry/storage/driver/swift"
"github.com/openshift/origin/pkg/cmd/server/crypto"
"github.com/openshift/origin/pkg/dockerregistry/server"
)
// Execute runs the Docker registry.
func Execute(configFile io.Reader) {
config, err := configuration.Parse(configFile)
if err != nil {
log.Fatalf("Error parsing configuration file: %s", err)
}
ctx := context.Background()
ctx, err = configureLogging(ctx, config)
if err != nil {
log.Fatalf("error configuring logger: %v", err)
}
log.Infof("version=%s", version.Version)
// inject a logger into the uuid library. warns us if there is a problem
// with uuid generation under low entropy.
uuid.Loggerf = context.GetLogger(ctx).Warnf
app := handlers.NewApp(ctx, config)
// TODO add https scheme
adminRouter := app.NewRoute().PathPrefix("/admin/").Subrouter()
pruneAccessRecords := func(*http.Request) []auth.Access {
return []auth.Access{
{
Resource: auth.Resource{
Type: "admin",
},
Action: "prune",
},
}
}
app.RegisterRoute(
// DELETE /admin/blobs/<digest>
adminRouter.Path("/blobs/{digest:"+reference.DigestRegexp.String()+"}").Methods("DELETE"),
// handler
server.BlobDispatcher,
// repo name not required in url
handlers.NameNotRequired,
// custom access records
pruneAccessRecords,
)
app.RegisterHealthChecks()
handler := alive("/", app)
// TODO: temporarily keep for backwards compatibility; remove in the future
handler = alive("/healthz", handler)
handler = health.Handler(handler)
handler = panicHandler(handler)
handler = gorillahandlers.CombinedLoggingHandler(os.Stdout, handler)
if config.HTTP.TLS.Certificate == "" {
context.GetLogger(app).Infof("listening on %v", config.HTTP.Addr)
if err := http.ListenAndServe(config.HTTP.Addr, handler); err != nil {
context.GetLogger(app).Fatalln(err)
}
} else {
tlsConf := crypto.SecureTLSConfig(&tls.Config{ClientAuth: tls.NoClientCert})
if len(config.HTTP.TLS.ClientCAs) != 0 {
pool := x509.NewCertPool()
for _, ca := range config.HTTP.TLS.ClientCAs {
caPem, err := ioutil.ReadFile(ca)
if err != nil {
context.GetLogger(app).Fatalln(err)
}
if ok := pool.AppendCertsFromPEM(caPem); !ok {
context.GetLogger(app).Fatalln(fmt.Errorf("Could not add CA to pool"))
}
}
for _, subj := range pool.Subjects() {
context.GetLogger(app).Debugf("CA Subject: %s", string(subj))
}
tlsConf.ClientAuth = tls.RequireAndVerifyClientCert
tlsConf.ClientCAs = pool
}
context.GetLogger(app).Infof("listening on %v, tls", config.HTTP.Addr)
server := &http.Server{
Addr: config.HTTP.Addr,
Handler: handler,
TLSConfig: tlsConf,
}
if err := server.ListenAndServeTLS(config.HTTP.TLS.Certificate, config.HTTP.TLS.Key); err != nil {
context.GetLogger(app).Fatalln(err)
}
}
}
// configureLogging prepares the context with a logger using the
// configuration.
func configureLogging(ctx context.Context, config *configuration.Configuration) (context.Context, error) {
if config.Log.Level == "" && config.Log.Formatter == "" {
// If no config for logging is set, fallback to deprecated "Loglevel".
log.SetLevel(logLevel(config.Loglevel))
ctx = context.WithLogger(ctx, context.GetLogger(ctx))
return ctx, nil
}
log.SetLevel(logLevel(config.Log.Level))
formatter := config.Log.Formatter
if formatter == "" {
formatter = "text" // default formatter
}
switch formatter {
case "json":
log.SetFormatter(&log.JSONFormatter{
TimestampFormat: time.RFC3339Nano,
})
case "text":
log.SetFormatter(&log.TextFormatter{
TimestampFormat: time.RFC3339Nano,
})
case "logstash":
log.SetFormatter(&logstash.LogstashFormatter{
TimestampFormat: time.RFC3339Nano,
})
default:
// just let the library use default on empty string.
if config.Log.Formatter != "" {
return ctx, fmt.Errorf("unsupported logging formatter: %q", config.Log.Formatter)
}
}
if config.Log.Formatter != "" {
log.Debugf("using %q logging formatter", config.Log.Formatter)
}
if len(config.Log.Fields) > 0 {
// build up the static fields, if present.
var fields []interface{}
for k := range config.Log.Fields {
fields = append(fields, k)
}
ctx = context.WithValues(ctx, config.Log.Fields)
ctx = context.WithLogger(ctx, context.GetLogger(ctx, fields...))
}
return ctx, nil
}
func logLevel(level configuration.Loglevel) log.Level {
l, err := log.ParseLevel(string(level))
if err != nil {
l = log.InfoLevel
log.Warnf("error parsing level %q: %v, using %q ", level, err, l)
}
return l
}
// alive simply wraps the handler with a route that always returns an http 200
// response when the path is matched. If the path is not matched, the request
// is passed to the provided handler. There is no guarantee of anything but
// that the server is up. Wrap with other handlers (such as health.Handler)
// for greater affect.
func alive(path string, handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == path {
w.Header().Set("Cache-Control", "no-cache")
w.WriteHeader(http.StatusOK)
return
}
handler.ServeHTTP(w, r)
})
}
// panicHandler add a HTTP handler to web app. The handler recover the happening
// panic. logrus.Panic transmits panic message to pre-config log hooks, which is
// defined in config.yml.
func panicHandler(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
log.Panic(fmt.Sprintf("%v", err))
}
}()
handler.ServeHTTP(w, r)
})
}