https://github.com/etcd-io/etcd
Tip revision: eddf599c689ec85f4752060edff5a72e81e9106a authored by Joe Betz on 29 March 2018, 17:45:17 UTC
version: bump up to 3.2.18
version: bump up to 3.2.18
Tip revision: eddf599
serve.go
// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package embed
import (
"crypto/tls"
"io/ioutil"
defaultLog "log"
"net"
"net/http"
"strings"
"github.com/coreos/etcd/etcdserver"
"github.com/coreos/etcd/etcdserver/api/v3client"
"github.com/coreos/etcd/etcdserver/api/v3election"
"github.com/coreos/etcd/etcdserver/api/v3election/v3electionpb"
v3electiongw "github.com/coreos/etcd/etcdserver/api/v3election/v3electionpb/gw"
"github.com/coreos/etcd/etcdserver/api/v3lock"
"github.com/coreos/etcd/etcdserver/api/v3lock/v3lockpb"
v3lockgw "github.com/coreos/etcd/etcdserver/api/v3lock/v3lockpb/gw"
"github.com/coreos/etcd/etcdserver/api/v3rpc"
etcdservergw "github.com/coreos/etcd/etcdserver/etcdserverpb/gw"
"github.com/coreos/etcd/pkg/debugutil"
"github.com/cockroachdb/cmux"
gw "github.com/grpc-ecosystem/grpc-gateway/runtime"
"golang.org/x/net/context"
"golang.org/x/net/trace"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
type serveCtx struct {
l net.Listener
addr string
secure bool
insecure bool
ctx context.Context
cancel context.CancelFunc
userHandlers map[string]http.Handler
serviceRegister func(*grpc.Server)
serversC chan *servers
}
type servers struct {
secure bool
grpc *grpc.Server
http *http.Server
}
func newServeCtx() *serveCtx {
ctx, cancel := context.WithCancel(context.Background())
return &serveCtx{
ctx: ctx,
cancel: cancel,
userHandlers: make(map[string]http.Handler),
serversC: make(chan *servers, 2), // in case sctx.insecure,sctx.secure true
}
}
// serve accepts incoming connections on the listener l,
// creating a new service goroutine for each. The service goroutines
// read requests and then call handler to reply to them.
func (sctx *serveCtx) serve(
s *etcdserver.EtcdServer,
tlscfg *tls.Config,
handler http.Handler,
errHandler func(error),
gopts ...grpc.ServerOption) error {
logger := defaultLog.New(ioutil.Discard, "etcdhttp", 0)
<-s.ReadyNotify()
plog.Info("ready to serve client requests")
m := cmux.New(sctx.l)
v3c := v3client.New(s)
servElection := v3election.NewElectionServer(v3c)
servLock := v3lock.NewLockServer(v3c)
if sctx.insecure {
gs := v3rpc.Server(s, nil, gopts...)
v3electionpb.RegisterElectionServer(gs, servElection)
v3lockpb.RegisterLockServer(gs, servLock)
if sctx.serviceRegister != nil {
sctx.serviceRegister(gs)
}
grpcl := m.Match(cmux.HTTP2())
go func() { errHandler(gs.Serve(grpcl)) }()
opts := []grpc.DialOption{grpc.WithInsecure()}
gwmux, err := sctx.registerGateway(opts)
if err != nil {
return err
}
httpmux := sctx.createMux(gwmux, handler)
srvhttp := &http.Server{
Handler: httpmux,
ErrorLog: logger, // do not log user error
}
httpl := m.Match(cmux.HTTP1())
go func() { errHandler(srvhttp.Serve(httpl)) }()
sctx.serversC <- &servers{grpc: gs, http: srvhttp}
plog.Noticef("serving insecure client requests on %s, this is strongly discouraged!", sctx.l.Addr().String())
}
if sctx.secure {
gs := v3rpc.Server(s, tlscfg, gopts...)
v3electionpb.RegisterElectionServer(gs, servElection)
v3lockpb.RegisterLockServer(gs, servLock)
if sctx.serviceRegister != nil {
sctx.serviceRegister(gs)
}
handler = grpcHandlerFunc(gs, handler)
dtls := tlscfg.Clone()
// trust local server
dtls.InsecureSkipVerify = true
creds := credentials.NewTLS(dtls)
opts := []grpc.DialOption{grpc.WithTransportCredentials(creds)}
gwmux, err := sctx.registerGateway(opts)
if err != nil {
return err
}
tlsl := tls.NewListener(m.Match(cmux.Any()), tlscfg)
// TODO: add debug flag; enable logging when debug flag is set
httpmux := sctx.createMux(gwmux, handler)
srv := &http.Server{
Handler: httpmux,
TLSConfig: tlscfg,
ErrorLog: logger, // do not log user error
}
go func() { errHandler(srv.Serve(tlsl)) }()
sctx.serversC <- &servers{secure: true, grpc: gs, http: srv}
plog.Infof("serving client requests on %s", sctx.l.Addr().String())
}
close(sctx.serversC)
return m.Serve()
}
// grpcHandlerFunc returns an http.Handler that delegates to grpcServer on incoming gRPC
// connections or otherHandler otherwise. Copied from cockroachdb.
func grpcHandlerFunc(grpcServer *grpc.Server, otherHandler http.Handler) http.Handler {
if otherHandler == nil {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
grpcServer.ServeHTTP(w, r)
})
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.ProtoMajor == 2 && strings.Contains(r.Header.Get("Content-Type"), "application/grpc") {
grpcServer.ServeHTTP(w, r)
} else {
otherHandler.ServeHTTP(w, r)
}
})
}
type registerHandlerFunc func(context.Context, *gw.ServeMux, *grpc.ClientConn) error
func (sctx *serveCtx) registerGateway(opts []grpc.DialOption) (*gw.ServeMux, error) {
ctx := sctx.ctx
conn, err := grpc.DialContext(ctx, sctx.addr, opts...)
if err != nil {
return nil, err
}
gwmux := gw.NewServeMux()
handlers := []registerHandlerFunc{
etcdservergw.RegisterKVHandler,
etcdservergw.RegisterWatchHandler,
etcdservergw.RegisterLeaseHandler,
etcdservergw.RegisterClusterHandler,
etcdservergw.RegisterMaintenanceHandler,
etcdservergw.RegisterAuthHandler,
v3lockgw.RegisterLockHandler,
v3electiongw.RegisterElectionHandler,
}
for _, h := range handlers {
if err := h(ctx, gwmux, conn); err != nil {
return nil, err
}
}
go func() {
<-ctx.Done()
if cerr := conn.Close(); cerr != nil {
plog.Warningf("failed to close conn to %s: %v", sctx.l.Addr().String(), cerr)
}
}()
return gwmux, nil
}
func (sctx *serveCtx) createMux(gwmux *gw.ServeMux, handler http.Handler) *http.ServeMux {
httpmux := http.NewServeMux()
for path, h := range sctx.userHandlers {
httpmux.Handle(path, h)
}
httpmux.Handle("/v3alpha/", gwmux)
if handler != nil {
httpmux.Handle("/", handler)
}
return httpmux
}
func (sctx *serveCtx) registerUserHandler(s string, h http.Handler) {
if sctx.userHandlers[s] != nil {
plog.Warningf("path %s already registered by user handler", s)
return
}
sctx.userHandlers[s] = h
}
func (sctx *serveCtx) registerPprof() {
for p, h := range debugutil.PProfHandlers() {
sctx.registerUserHandler(p, h)
}
}
func (sctx *serveCtx) registerTrace() {
reqf := func(w http.ResponseWriter, r *http.Request) { trace.Render(w, r, true) }
sctx.registerUserHandler("/debug/requests", http.HandlerFunc(reqf))
evf := func(w http.ResponseWriter, r *http.Request) { trace.RenderEvents(w, r, true) }
sctx.registerUserHandler("/debug/events", http.HandlerFunc(evf))
}