forked from etcd-io/etcd
-
Notifications
You must be signed in to change notification settings - Fork 1
/
transport.go
372 lines (332 loc) · 10.8 KB
/
transport.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
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
// 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 rafthttp
import (
"net/http"
"sync"
"time"
"github.com/coreos/etcd/etcdserver/stats"
"github.com/coreos/etcd/pkg/logutil"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/raft"
"github.com/coreos/etcd/raft/raftpb"
"github.com/coreos/etcd/snap"
"github.com/coreos/pkg/capnslog"
"github.com/xiang90/probing"
"golang.org/x/net/context"
)
var plog = logutil.NewMergeLogger(capnslog.NewPackageLogger("github.com/coreos/etcd", "rafthttp"))
type Raft interface {
Process(ctx context.Context, m raftpb.Message) error
IsIDRemoved(id uint64) bool
ReportUnreachable(id uint64)
ReportSnapshot(id uint64, status raft.SnapshotStatus)
}
type Transporter interface {
// Start starts the given Transporter.
// Start MUST be called before calling other functions in the interface.
Start() error
// Handler returns the HTTP handler of the transporter.
// A transporter HTTP handler handles the HTTP requests
// from remote peers.
// The handler MUST be used to handle RaftPrefix(/raft)
// endpoint.
Handler() http.Handler
// Send sends out the given messages to the remote peers.
// Each message has a To field, which is an id that maps
// to an existing peer in the transport.
// If the id cannot be found in the transport, the message
// will be ignored.
Send(m []raftpb.Message)
// SendSnapshot sends out the given snapshot message to a remote peer.
// The behavior of SendSnapshot is similar to Send.
SendSnapshot(m snap.Message)
// AddRemote adds a remote with given peer urls into the transport.
// A remote helps newly joined member to catch up the progress of cluster,
// and will not be used after that.
// It is the caller's responsibility to ensure the urls are all valid,
// or it panics.
AddRemote(id types.ID, urls []string)
// AddPeer adds a peer with given peer urls into the transport.
// It is the caller's responsibility to ensure the urls are all valid,
// or it panics.
// Peer urls are used to connect to the remote peer.
AddPeer(id types.ID, urls []string)
// RemovePeer removes the peer with given id.
RemovePeer(id types.ID)
// RemoveAllPeers removes all the existing peers in the transport.
RemoveAllPeers()
// UpdatePeer updates the peer urls of the peer with the given id.
// It is the caller's responsibility to ensure the urls are all valid,
// or it panics.
UpdatePeer(id types.ID, urls []string)
// ActiveSince returns the time that the connection with the peer
// of the given id becomes active.
// If the connection is active since peer was added, it returns the adding time.
// If the connection is currently inactive, it returns zero time.
ActiveSince(id types.ID) time.Time
// Stop closes the connections and stops the transporter.
Stop()
}
// Transport implements Transporter interface. It provides the functionality
// to send raft messages to peers, and receive raft messages from peers.
// User should call Handler method to get a handler to serve requests
// received from peerURLs.
// User needs to call Start before calling other functions, and call
// Stop when the Transport is no longer used.
type Transport struct {
DialTimeout time.Duration // maximum duration before timing out dial of the request
TLSInfo transport.TLSInfo // TLS information used when creating connection
ID types.ID // local member ID
URLs types.URLs // local peer URLs
ClusterID types.ID // raft cluster ID for request validation
Raft Raft // raft state machine, to which the Transport forwards received messages and reports status
Snapshotter *snap.Snapshotter
ServerStats *stats.ServerStats // used to record general transportation statistics
// used to record transportation statistics with followers when
// performing as leader in raft protocol
LeaderStats *stats.LeaderStats
// ErrorC is used to report detected critical errors, e.g.,
// the member has been permanently removed from the cluster
// When an error is received from ErrorC, user should stop raft state
// machine and thus stop the Transport.
ErrorC chan error
streamRt http.RoundTripper // roundTripper used by streams
pipelineRt http.RoundTripper // roundTripper used by pipelines
mu sync.RWMutex // protect the remote and peer map
remotes map[types.ID]*remote // remotes map that helps newly joined member to catch up
peers map[types.ID]Peer // peers map
prober probing.Prober
}
func (t *Transport) Start() error {
var err error
t.streamRt, err = newStreamRoundTripper(t.TLSInfo, t.DialTimeout)
if err != nil {
return err
}
t.pipelineRt, err = NewRoundTripper(t.TLSInfo, t.DialTimeout)
if err != nil {
return err
}
t.remotes = make(map[types.ID]*remote)
t.peers = make(map[types.ID]Peer)
t.prober = probing.NewProber(t.pipelineRt)
return nil
}
func (t *Transport) Handler() http.Handler {
pipelineHandler := newPipelineHandler(t, t.Raft, t.ClusterID)
streamHandler := newStreamHandler(t, t, t.Raft, t.ID, t.ClusterID)
snapHandler := newSnapshotHandler(t, t.Raft, t.Snapshotter, t.ClusterID)
mux := http.NewServeMux()
mux.Handle(RaftPrefix, pipelineHandler)
mux.Handle(RaftStreamPrefix+"/", streamHandler)
mux.Handle(RaftSnapshotPrefix, snapHandler)
mux.Handle(ProbingPrefix, probing.NewHandler())
return mux
}
func (t *Transport) Get(id types.ID) Peer {
t.mu.RLock()
defer t.mu.RUnlock()
return t.peers[id]
}
func (t *Transport) Send(msgs []raftpb.Message) {
for _, m := range msgs {
if m.To == 0 {
// ignore intentionally dropped message
continue
}
to := types.ID(m.To)
t.mu.RLock()
p, pok := t.peers[to]
g, rok := t.remotes[to]
t.mu.RUnlock()
if pok {
if m.Type == raftpb.MsgApp {
t.ServerStats.SendAppendReq(m.Size())
}
p.send(m)
continue
}
if rok {
g.send(m)
continue
}
plog.Debugf("ignored message %s (sent to unknown peer %s)", m.Type, to)
}
}
func (t *Transport) Stop() {
t.mu.Lock()
defer t.mu.Unlock()
for _, r := range t.remotes {
r.stop()
}
for _, p := range t.peers {
p.stop()
}
t.prober.RemoveAll()
if tr, ok := t.streamRt.(*http.Transport); ok {
tr.CloseIdleConnections()
}
if tr, ok := t.pipelineRt.(*http.Transport); ok {
tr.CloseIdleConnections()
}
t.peers = nil
t.remotes = nil
}
func (t *Transport) AddRemote(id types.ID, us []string) {
t.mu.Lock()
defer t.mu.Unlock()
if t.remotes == nil {
// there's no clean way to shutdown the golang http server
// (see: https://github.com/golang/go/issues/4674) before
// stopping the transport; ignore any new connections.
return
}
if _, ok := t.peers[id]; ok {
return
}
if _, ok := t.remotes[id]; ok {
return
}
urls, err := types.NewURLs(us)
if err != nil {
plog.Panicf("newURLs %+v should never fail: %+v", us, err)
}
t.remotes[id] = startRemote(t, urls, id)
}
func (t *Transport) AddPeer(id types.ID, us []string) {
t.mu.Lock()
defer t.mu.Unlock()
if t.peers == nil {
panic("transport stopped")
}
if _, ok := t.peers[id]; ok {
return
}
urls, err := types.NewURLs(us)
if err != nil {
plog.Panicf("newURLs %+v should never fail: %+v", us, err)
}
fs := t.LeaderStats.Follower(id.String())
t.peers[id] = startPeer(t, urls, id, fs)
addPeerToProber(t.prober, id.String(), us)
plog.Infof("added peer %s", id)
}
func (t *Transport) RemovePeer(id types.ID) {
t.mu.Lock()
defer t.mu.Unlock()
t.removePeer(id)
}
func (t *Transport) RemoveAllPeers() {
t.mu.Lock()
defer t.mu.Unlock()
for id := range t.peers {
t.removePeer(id)
}
}
// the caller of this function must have the peers mutex.
func (t *Transport) removePeer(id types.ID) {
if peer, ok := t.peers[id]; ok {
peer.stop()
} else {
plog.Panicf("unexpected removal of unknown peer '%d'", id)
}
delete(t.peers, id)
delete(t.LeaderStats.Followers, id.String())
t.prober.Remove(id.String())
plog.Infof("removed peer %s", id)
}
func (t *Transport) UpdatePeer(id types.ID, us []string) {
t.mu.Lock()
defer t.mu.Unlock()
// TODO: return error or just panic?
if _, ok := t.peers[id]; !ok {
return
}
urls, err := types.NewURLs(us)
if err != nil {
plog.Panicf("newURLs %+v should never fail: %+v", us, err)
}
t.peers[id].update(urls)
t.prober.Remove(id.String())
addPeerToProber(t.prober, id.String(), us)
plog.Infof("updated peer %s", id)
}
func (t *Transport) ActiveSince(id types.ID) time.Time {
t.mu.Lock()
defer t.mu.Unlock()
if p, ok := t.peers[id]; ok {
return p.activeSince()
}
return time.Time{}
}
func (t *Transport) SendSnapshot(m snap.Message) {
t.mu.Lock()
defer t.mu.Unlock()
p := t.peers[types.ID(m.To)]
if p == nil {
m.CloseWithError(errMemberNotFound)
return
}
p.sendSnap(m)
}
// Pausable is a testing interface for pausing transport traffic.
type Pausable interface {
Pause()
Resume()
}
func (t *Transport) Pause() {
for _, p := range t.peers {
p.(Pausable).Pause()
}
}
func (t *Transport) Resume() {
for _, p := range t.peers {
p.(Pausable).Resume()
}
}
type nopTransporter struct{}
func NewNopTransporter() Transporter {
return &nopTransporter{}
}
func (s *nopTransporter) Start() error { return nil }
func (s *nopTransporter) Handler() http.Handler { return nil }
func (s *nopTransporter) Send(m []raftpb.Message) {}
func (s *nopTransporter) SendSnapshot(m snap.Message) {}
func (s *nopTransporter) AddRemote(id types.ID, us []string) {}
func (s *nopTransporter) AddPeer(id types.ID, us []string) {}
func (s *nopTransporter) RemovePeer(id types.ID) {}
func (s *nopTransporter) RemoveAllPeers() {}
func (s *nopTransporter) UpdatePeer(id types.ID, us []string) {}
func (s *nopTransporter) ActiveSince(id types.ID) time.Time { return time.Time{} }
func (s *nopTransporter) Stop() {}
func (s *nopTransporter) Pause() {}
func (s *nopTransporter) Resume() {}
type snapTransporter struct {
nopTransporter
snapDoneC chan snap.Message
snapDir string
}
func NewSnapTransporter(snapDir string) (Transporter, <-chan snap.Message) {
ch := make(chan snap.Message, 1)
tr := &snapTransporter{snapDoneC: ch, snapDir: snapDir}
return tr, ch
}
func (s *snapTransporter) SendSnapshot(m snap.Message) {
ss := snap.New(s.snapDir)
ss.SaveDBFrom(m.ReadCloser, m.Snapshot.Metadata.Index+1)
m.CloseWithError(nil)
s.snapDoneC <- m
}