forked from quic-go/quic-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
send_stream.go
338 lines (294 loc) · 8.76 KB
/
send_stream.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
package quic
import (
"context"
"fmt"
"sync"
"time"
"github.com/boisjacques/qed/internal/flowcontrol"
"github.com/boisjacques/qed/internal/protocol"
"github.com/boisjacques/qed/internal/utils"
"github.com/boisjacques/qed/internal/wire"
)
type sendStreamI interface {
SendStream
handleStopSendingFrame(*wire.StopSendingFrame)
hasData() bool
popStreamFrame(maxBytes protocol.ByteCount) (*wire.StreamFrame, bool)
closeForShutdown(error)
handleMaxStreamDataFrame(*wire.MaxStreamDataFrame)
}
type sendStream struct {
mutex sync.Mutex
ctx context.Context
ctxCancel context.CancelFunc
streamID protocol.StreamID
sender streamSender
writeOffset protocol.ByteCount
cancelWriteErr error
closeForShutdownErr error
closedForShutdown bool // set when CloseForShutdown() is called
finishedWriting bool // set once Close() is called
canceledWrite bool // set when CancelWrite() is called, or a STOP_SENDING frame is received
finSent bool // set when a STREAM_FRAME with FIN bit has b
dataForWriting []byte
writeChan chan struct{}
deadline time.Time
deadlineTimer *time.Timer // initialized by SetReadDeadline()
flowController flowcontrol.StreamFlowController
version protocol.VersionNumber
}
var _ SendStream = &sendStream{}
var _ sendStreamI = &sendStream{}
func newSendStream(
streamID protocol.StreamID,
sender streamSender,
flowController flowcontrol.StreamFlowController,
version protocol.VersionNumber,
) *sendStream {
s := &sendStream{
streamID: streamID,
sender: sender,
flowController: flowController,
writeChan: make(chan struct{}, 1),
version: version,
}
s.ctx, s.ctxCancel = context.WithCancel(context.Background())
return s
}
func (s *sendStream) StreamID() protocol.StreamID {
return s.streamID // same for receiveStream and sendStream
}
func (s *sendStream) Write(p []byte) (int, error) {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.finishedWriting {
return 0, fmt.Errorf("write on closed stream %d", s.streamID)
}
if s.canceledWrite {
return 0, s.cancelWriteErr
}
if s.closeForShutdownErr != nil {
return 0, s.closeForShutdownErr
}
if !s.deadline.IsZero() && !time.Now().Before(s.deadline) {
return 0, errDeadline
}
if len(p) == 0 {
return 0, nil
}
s.dataForWriting = make([]byte, len(p))
copy(s.dataForWriting, p)
s.sender.onHasStreamData(s.streamID)
var bytesWritten int
var err error
for {
bytesWritten = len(p) - len(s.dataForWriting)
if !s.deadline.IsZero() && !time.Now().Before(s.deadline) {
s.dataForWriting = nil
err = errDeadline
break
}
if s.dataForWriting == nil || s.canceledWrite || s.closedForShutdown {
break
}
s.mutex.Unlock()
if s.deadline.IsZero() {
<-s.writeChan
} else {
select {
case <-s.writeChan:
case <-s.deadlineTimer.C:
}
}
s.mutex.Lock()
}
if s.closeForShutdownErr != nil {
err = s.closeForShutdownErr
} else if s.cancelWriteErr != nil {
err = s.cancelWriteErr
}
return bytesWritten, err
}
// popStreamFrame returns the next STREAM frame that is supposed to be sent on this stream
// maxBytes is the maximum length this frame (including frame header) will have.
func (s *sendStream) popStreamFrame(maxBytes protocol.ByteCount) (*wire.StreamFrame, bool /* has more data to send */) {
completed, frame, hasMoreData := s.popStreamFrameImpl(maxBytes)
if completed {
s.sender.onStreamCompleted(s.streamID)
}
return frame, hasMoreData
}
func (s *sendStream) popStreamFrameImpl(maxBytes protocol.ByteCount) (bool /* completed */, *wire.StreamFrame, bool /* has more data to send */) {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.closeForShutdownErr != nil {
return false, nil, false
}
frame := &wire.StreamFrame{
StreamID: s.streamID,
Offset: s.writeOffset,
DataLenPresent: true,
}
maxDataLen := frame.MaxDataLen(maxBytes, s.version)
if maxDataLen == 0 { // a STREAM frame must have at least one byte of data
return false, nil, s.dataForWriting != nil
}
frame.Data, frame.FinBit = s.getDataForWriting(maxDataLen)
if len(frame.Data) == 0 && !frame.FinBit {
// this can happen if:
// - popStreamFrame is called but there's no data for writing
// - there's data for writing, but the stream is stream-level flow control blocked
// - there's data for writing, but the stream is Connection-level flow control blocked
if s.dataForWriting == nil {
return false, nil, false
}
if isBlocked, offset := s.flowController.IsNewlyBlocked(); isBlocked {
s.sender.queueControlFrame(&wire.StreamDataBlockedFrame{
StreamID: s.streamID,
DataLimit: offset,
})
return false, nil, false
}
return false, nil, true
}
if frame.FinBit {
s.finSent = true
}
return frame.FinBit, frame, s.dataForWriting != nil
}
func (s *sendStream) hasData() bool {
s.mutex.Lock()
hasData := len(s.dataForWriting) > 0
s.mutex.Unlock()
return hasData
}
func (s *sendStream) getDataForWriting(maxBytes protocol.ByteCount) ([]byte, bool /* should send FIN */) {
if s.dataForWriting == nil {
return nil, s.finishedWriting && !s.finSent
}
maxBytes = utils.MinByteCount(maxBytes, s.flowController.SendWindowSize())
if maxBytes == 0 {
return nil, false
}
var ret []byte
if protocol.ByteCount(len(s.dataForWriting)) > maxBytes {
ret = s.dataForWriting[:maxBytes]
s.dataForWriting = s.dataForWriting[maxBytes:]
} else {
ret = s.dataForWriting
s.dataForWriting = nil
s.signalWrite()
}
s.writeOffset += protocol.ByteCount(len(ret))
s.flowController.AddBytesSent(protocol.ByteCount(len(ret)))
return ret, s.finishedWriting && s.dataForWriting == nil && !s.finSent
}
func (s *sendStream) Close() error {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.canceledWrite {
return fmt.Errorf("Close called for canceled stream %d", s.streamID)
}
s.finishedWriting = true
s.sender.onHasStreamData(s.streamID) // need to send the FIN
s.ctxCancel()
return nil
}
func (s *sendStream) CancelWrite(errorCode protocol.ApplicationErrorCode) error {
s.mutex.Lock()
completed, err := s.cancelWriteImpl(errorCode, fmt.Errorf("Write on stream %d canceled with error code %d", s.streamID, errorCode))
s.mutex.Unlock()
if completed {
s.sender.onStreamCompleted(s.streamID)
}
return err
}
// must be called after locking the mutex
func (s *sendStream) cancelWriteImpl(errorCode protocol.ApplicationErrorCode, writeErr error) (bool /*completed */, error) {
if s.canceledWrite {
return false, nil
}
if s.finishedWriting {
return false, fmt.Errorf("CancelWrite for closed stream %d", s.streamID)
}
s.canceledWrite = true
s.cancelWriteErr = writeErr
s.signalWrite()
s.sender.queueControlFrame(&wire.ResetStreamFrame{
StreamID: s.streamID,
ByteOffset: s.writeOffset,
ErrorCode: errorCode,
})
// TODO(#991): cancel retransmissions for this stream
s.ctxCancel()
return true, nil
}
func (s *sendStream) handleStopSendingFrame(frame *wire.StopSendingFrame) {
if completed := s.handleStopSendingFrameImpl(frame); completed {
s.sender.onStreamCompleted(s.streamID)
}
}
func (s *sendStream) handleMaxStreamDataFrame(frame *wire.MaxStreamDataFrame) {
s.flowController.UpdateSendWindow(frame.ByteOffset)
s.mutex.Lock()
if s.dataForWriting != nil {
s.sender.onHasStreamData(s.streamID)
}
s.mutex.Unlock()
}
// must be called after locking the mutex
func (s *sendStream) handleStopSendingFrameImpl(frame *wire.StopSendingFrame) bool /*completed*/ {
s.mutex.Lock()
defer s.mutex.Unlock()
writeErr := streamCanceledError{
errorCode: frame.ErrorCode,
error: fmt.Errorf("Stream %d was reset with error code %d", s.streamID, frame.ErrorCode),
}
errorCode := errorCodeStopping
completed, _ := s.cancelWriteImpl(errorCode, writeErr)
return completed
}
func (s *sendStream) Context() context.Context {
return s.ctx
}
func (s *sendStream) SetWriteDeadline(t time.Time) error {
s.mutex.Lock()
defer s.mutex.Unlock()
s.deadline = t
if s.deadline.IsZero() { // skip if there's no deadline to set
s.signalWrite()
return nil
}
// Lazily initialize the deadline timer.
if s.deadlineTimer == nil {
s.deadlineTimer = time.NewTimer(time.Until(t))
return nil
}
// reset the timer to the new deadline
if !s.deadlineTimer.Stop() {
<-s.deadlineTimer.C
}
s.deadlineTimer.Reset(time.Until(t))
return nil
}
// CloseForShutdown closes a stream abruptly.
// It makes Write unblock (and return the error) immediately.
// The peer will NOT be informed about this: the stream is closed without sending a FIN or RST.
func (s *sendStream) closeForShutdown(err error) {
s.mutex.Lock()
s.closedForShutdown = true
s.closeForShutdownErr = err
s.mutex.Unlock()
s.signalWrite()
s.ctxCancel()
}
func (s *sendStream) getWriteOffset() protocol.ByteCount {
return s.writeOffset
}
// signalWrite performs a non-blocking send on the writeChan
func (s *sendStream) signalWrite() {
select {
case s.writeChan <- struct{}{}:
default:
}
}