-
Notifications
You must be signed in to change notification settings - Fork 3
/
serve.go
286 lines (251 loc) · 8.55 KB
/
serve.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
// 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 (
"context"
"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/coreos/etcd/pkg/transport"
gw "github.com/grpc-ecosystem/grpc-gateway/runtime"
"github.com/soheilhy/cmux"
"github.com/tmc/grpc-websocket-proxy/wsproxy"
"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,
tlsinfo *transport.TLSInfo,
handler http.Handler,
errHandler func(error),
gopts ...grpc.ServerOption) (err error) {
logger := defaultLog.New(ioutil.Discard, "etcdhttp", 0)
<-s.ReadyNotify() //阻塞监听EtcdServer.readych通道
plog.Info("ready to serve client requests")
m := cmux.New(sctx.l)
v3c := v3client.New(s)
servElection := v3election.NewElectionServer(v3c)
servLock := v3lock.NewLockServer(v3c)
var gs *grpc.Server
defer func() {
if err != nil && gs != nil {
gs.Stop()
}
}()
if sctx.insecure {
gs = v3rpc.Server(s, nil, gopts...) //在其中会完成GRPC服务的注册
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)) }() //在单独后台的goroutine中启动GRPC服务
var gwmux *gw.ServeMux
gwmux, err = sctx.registerGateway([]grpc.DialOption{grpc.WithInsecure()})
if err != nil {
return err
}
httpmux := sctx.createMux(gwmux, handler)
srvhttp := &http.Server{
Handler: wrapMux(httpmux),
ErrorLog: logger, // do not log user error
}
httpl := m.Match(cmux.HTTP1())
go func() { errHandler(srvhttp.Serve(httpl)) }() //在单独的后台goroutine中启动一个http.Server实例,用来处理Client CompactionRequest V2请求
sctx.serversC <- &servers{grpc: gs, http: srvhttp}
plog.Noticef("serving insecure client requests on %s, this is strongly discouraged!", sctx.l.Addr().String())
}
//加密场景下的初始化与上述初始化类似。需要注意,在这里注册之后得到的grpc.Server实例也会写入相应的grpcServerC通道中,在该节点关闭时,会在Etcd.Close()方法中
//关闭这些GRPC服务。
if sctx.secure {
tlscfg, tlsErr := tlsinfo.ServerConfig()
if tlsErr != nil {
return tlsErr
}
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)}
var gwmux *gw.ServeMux
gwmux, err = sctx.registerGateway(opts)
if err != nil {
return err
}
var tlsl net.Listener
tlsl, err = transport.NewTLSListener(m.Match(cmux.Any()), tlsinfo)
if err != nil {
return err
}
// TODO: add debug flag; enable logging when debug flag is set
httpmux := sctx.createMux(gwmux, handler)
srv := &http.Server{
Handler: wrapMux(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. Given in gRPC docs.
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(
"/v3beta/",
wsproxy.WebsocketProxy(
gwmux,
wsproxy.WithRequestMutator(
// Default to the POST method for streams
func(incoming *http.Request, outgoing *http.Request) *http.Request {
outgoing.Method = "POST"
return outgoing
},
),
),
)
if handler != nil {
httpmux.Handle("/", handler)
}
return httpmux
}
// wraps HTTP multiplexer to mute requests to /v3alpha
// TODO: deprecate this in 3.4 release
func wrapMux(mux *http.ServeMux) http.Handler { return &v3alphaMutator{mux: mux} }
type v3alphaMutator struct {
mux *http.ServeMux
}
func (m *v3alphaMutator) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if req != nil && req.URL != nil && strings.HasPrefix(req.URL.Path, "/v3alpha/") {
req.URL.Path = strings.Replace(req.URL.Path, "/v3alpha/", "/v3beta/", 1)
}
m.mux.ServeHTTP(rw, req)
}
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))
}