Class: Protocol::HTTP2::Connection
- Inherits:
-
Object
- Object
- Protocol::HTTP2::Connection
show all
- Includes:
- FlowControlled
- Defined in:
- lib/protocol/http2/connection.rb
Instance Attribute Summary collapse
Instance Method Summary
collapse
-
#[](id) ⇒ Object
-
#accept_push_promise_stream(stream_id, &block) ⇒ Object
Accept an incoming push promise from the other side of the connection.
-
#accept_stream(stream_id, &block) ⇒ Object
Accept an incoming stream from the other side of the connnection.
-
#client_stream_id?(id) ⇒ Boolean
-
#close(error = nil) ⇒ Object
Close the underlying framer and all streams.
-
#close! ⇒ Object
Transition the connection into the closed state.
-
#closed? ⇒ Boolean
-
#closed_stream_id?(id) ⇒ Boolean
-
#consume_window(size = self.available_size) ⇒ Object
Traverse active streams in order of priority and allow them to consume the available flow-control window.
-
#create_push_promise_stream(&block) ⇒ Object
-
#create_stream(id = next_stream_id, &block) ⇒ Stream
Create a stream, defaults to an outgoing stream.
-
#decode_headers(data) ⇒ Object
-
#delete(id) ⇒ Object
-
#encode_headers(headers, buffer = String.new.b) ⇒ Object
-
#id ⇒ Object
-
#idle_stream_id?(id) ⇒ Boolean
-
#ignore_frame?(frame) ⇒ Boolean
-
#initialize(framer, local_stream_id) ⇒ Connection
constructor
A new instance of Connection.
-
#maximum_concurrent_streams ⇒ Object
-
#maximum_frame_size ⇒ Object
The size of a frame payload is limited by the maximum size that a receiver advertises in the SETTINGS_MAX_FRAME_SIZE setting.
-
#next_stream_id ⇒ Object
Streams are identified with an unsigned 31-bit integer.
-
#open! ⇒ Object
-
#process_settings(frame) ⇒ Boolean
In addition to changing the flow-control window for streams that are not yet active, a SETTINGS frame can alter the initial flow-control window size for streams with active flow-control windows (that is, streams in the “open” or “half-closed (remote)” state).
-
#read_frame ⇒ Object
Reads one frame from the network and processes.
-
#receive_continuation(frame) ⇒ Object
-
#receive_data(frame) ⇒ Object
-
#receive_frame(frame) ⇒ Object
-
#receive_goaway(frame) ⇒ Object
-
#receive_headers(frame) ⇒ Object
On the server side, starts a new request.
-
#receive_ping(frame) ⇒ Object
-
#receive_priority(frame) ⇒ Object
Sets the priority for an incoming stream.
-
#receive_push_promise(frame) ⇒ Object
-
#receive_reset_stream(frame) ⇒ Object
-
#receive_settings(frame) ⇒ Object
-
#receive_window_update(frame) ⇒ Object
-
#send_goaway(error_code = 0, message = "") ⇒ Object
Tell the remote end that the connection is being shut down.
-
#send_ping(data) ⇒ Object
-
#send_priority(stream_id, priority) ⇒ Object
-
#send_settings(changes) ⇒ Object
-
#server_stream_id?(id) ⇒ Boolean
-
#update_local_settings(changes) ⇒ Object
-
#update_remote_settings(changes) ⇒ Object
-
#valid_remote_stream_id? ⇒ Boolean
-
#write_frame(frame) ⇒ Object
-
#write_frames {|@framer| ... } ⇒ Object
#available_frame_size, #available_size, #consume_local_window, #consume_remote_window, #request_window_update, #send_window_update, #update_local_window, #window_updated
Constructor Details
#initialize(framer, local_stream_id) ⇒ Connection
Returns a new instance of Connection.
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
|
# File 'lib/protocol/http2/connection.rb', line 32
def initialize(framer, local_stream_id)
super()
@state = :new
@streams = {}
@dependency = Dependency.new(self, 0)
@dependencies = {0 => @dependency}
@framer = framer
@local_stream_id = local_stream_id
@remote_stream_id = 0
@local_settings = PendingSettings.new
@remote_settings = Settings.new
@decoder = HPACK::Context.new
@encoder = HPACK::Context.new
@local_window = LocalWindow.new
@remote_window = Window.new
end
|
Instance Attribute Details
#dependencies ⇒ Object
Returns the value of attribute dependencies.
142
143
144
|
# File 'lib/protocol/http2/connection.rb', line 142
def dependencies
@dependencies
end
|
#dependency ⇒ Object
Returns the value of attribute dependency.
144
145
146
|
# File 'lib/protocol/http2/connection.rb', line 144
def dependency
@dependency
end
|
#framer ⇒ Object
Returns the value of attribute framer.
83
84
85
|
# File 'lib/protocol/http2/connection.rb', line 83
def framer
@framer
end
|
#local_settings ⇒ Object
Current settings value for local and peer
89
90
91
|
# File 'lib/protocol/http2/connection.rb', line 89
def local_settings
@local_settings
end
|
#local_window ⇒ Object
Our window for receiving data. When we receive data, it reduces this window. If the window gets too small, we must send a window update.
94
95
96
|
# File 'lib/protocol/http2/connection.rb', line 94
def local_window
@local_window
end
|
#remote_settings ⇒ Object
Returns the value of attribute remote_settings.
90
91
92
|
# File 'lib/protocol/http2/connection.rb', line 90
def remote_settings
@remote_settings
end
|
#remote_stream_id ⇒ Object
The highest stream_id that has been successfully accepted by this connection.
100
101
102
|
# File 'lib/protocol/http2/connection.rb', line 100
def remote_stream_id
@remote_stream_id
end
|
#remote_window ⇒ Object
Our window for sending data. When we send data, it reduces this window.
97
98
99
|
# File 'lib/protocol/http2/connection.rb', line 97
def remote_window
@remote_window
end
|
#state ⇒ Object
Connection state (:new, :open, :closed).
86
87
88
|
# File 'lib/protocol/http2/connection.rb', line 86
def state
@state
end
|
#streams ⇒ Object
Returns the value of attribute streams.
140
141
142
|
# File 'lib/protocol/http2/connection.rb', line 140
def streams
@streams
end
|
Instance Method Details
#[](id) ⇒ Object
66
67
68
69
70
71
72
|
# File 'lib/protocol/http2/connection.rb', line 66
def [] id
if id.zero?
self
else
@streams[id]
end
end
|
#accept_push_promise_stream(stream_id, &block) ⇒ Object
Accept an incoming push promise from the other side of the connection. On the client side, we accept push promise streams. On the server side, existing streams create push promise streams.
346
347
348
|
# File 'lib/protocol/http2/connection.rb', line 346
def accept_push_promise_stream(stream_id, &block)
accept_stream(stream_id, &block)
end
|
#accept_stream(stream_id, &block) ⇒ Object
Accept an incoming stream from the other side of the connnection. On the server side, we accept requests.
335
336
337
338
339
340
341
|
# File 'lib/protocol/http2/connection.rb', line 335
def accept_stream(stream_id, &block)
unless valid_remote_stream_id?(stream_id)
raise ProtocolError, "Invalid stream id: #{stream_id}"
end
create_stream(stream_id, &block)
end
|
#client_stream_id?(id) ⇒ Boolean
429
430
431
|
# File 'lib/protocol/http2/connection.rb', line 429
def client_stream_id?(id)
id.odd?
end
|
#close(error = nil) ⇒ Object
Close the underlying framer and all streams.
112
113
114
115
116
117
118
119
120
121
|
# File 'lib/protocol/http2/connection.rb', line 112
def close(error = nil)
@streams.each_value{|stream| stream.close(error)}
@streams.clear
if @framer
@framer.close
@framer = nil
end
end
|
#close! ⇒ Object
Transition the connection into the closed state.
193
194
195
196
197
|
# File 'lib/protocol/http2/connection.rb', line 193
def close!
@state = :closed
return self
end
|
#closed? ⇒ Boolean
102
103
104
|
# File 'lib/protocol/http2/connection.rb', line 102
def closed?
@state == :closed
end
|
#closed_stream_id?(id) ⇒ Boolean
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
|
# File 'lib/protocol/http2/connection.rb', line 437
def closed_stream_id?(id)
if id.zero?
false
elsif id.even?
if @local_stream_id.even?
id < @local_stream_id
else
id <= @remote_stream_id
end
elsif id.odd?
if @local_stream_id.odd?
id < @local_stream_id
else
id <= @remote_stream_id
end
end
end
|
#consume_window(size = self.available_size) ⇒ Object
Traverse active streams in order of priority and allow them to consume the available flow-control window.
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
|
# File 'lib/protocol/http2/connection.rb', line 472
def consume_window(size = self.available_size)
return unless size > 0
@dependency.consume_window(size)
end
|
#create_push_promise_stream(&block) ⇒ Object
361
362
363
|
# File 'lib/protocol/http2/connection.rb', line 361
def create_push_promise_stream(&block)
create_stream(&block)
end
|
#create_stream(id = next_stream_id, &block) ⇒ Stream
Create a stream, defaults to an outgoing stream. On the client side, we create requests.
353
354
355
356
357
358
359
|
# File 'lib/protocol/http2/connection.rb', line 353
def create_stream(id = next_stream_id, &block)
if block_given?
return yield(self, id)
else
return Stream.create(self, id)
end
end
|
127
128
129
|
# File 'lib/protocol/http2/connection.rb', line 127
def (data)
HPACK::Decompressor.new(data, @decoder, table_size_limit: @local_settings.).decode
end
|
#delete(id) ⇒ Object
106
107
108
109
|
# File 'lib/protocol/http2/connection.rb', line 106
def delete(id)
@streams.delete(id)
@dependencies[id]&.delete!
end
|
123
124
125
|
# File 'lib/protocol/http2/connection.rb', line 123
def (, buffer = String.new.b)
HPACK::Compressor.new(buffer, @encoder, table_size_limit: @remote_settings.).encode()
end
|
#id ⇒ Object
62
63
64
|
# File 'lib/protocol/http2/connection.rb', line 62
def id
0
end
|
#idle_stream_id?(id) ⇒ Boolean
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
|
# File 'lib/protocol/http2/connection.rb', line 398
def idle_stream_id?(id)
if id.even?
if @local_stream_id.even?
id >= @local_stream_id
else
id > @remote_stream_id
end
elsif id.odd?
if @local_stream_id.odd?
id >= @local_stream_id
else
id > @remote_stream_id
end
end
end
|
#ignore_frame?(frame) ⇒ Boolean
6.8. GOAWAY There is an inherent race condition between an endpoint starting new streams and the remote sending a GOAWAY frame. To deal with this case, the GOAWAY contains the stream identifier of the last peer-initiated stream that was or might be processed on the sending endpoint in this connection. For instance, if the server sends a GOAWAY frame, the identified stream is the highest-numbered stream initiated by the client. Once sent, the sender will ignore frames sent on streams initiated by the receiver if the stream has an identifier higher than the included last stream identifier. Receivers of a GOAWAY frame MUST NOT open additional streams on the connection, although a new connection can be established for new streams.
149
150
151
152
153
154
155
156
|
# File 'lib/protocol/http2/connection.rb', line 149
def ignore_frame?(frame)
if self.closed?
if valid_remote_stream_id?(frame.stream_id)
return frame.stream_id > @remote_stream_id
end
end
end
|
#maximum_concurrent_streams ⇒ Object
79
80
81
|
# File 'lib/protocol/http2/connection.rb', line 79
def maximum_concurrent_streams
[@local_settings.maximum_concurrent_streams, @remote_settings.maximum_concurrent_streams].min
end
|
#maximum_frame_size ⇒ Object
The size of a frame payload is limited by the maximum size that a receiver advertises in the SETTINGS_MAX_FRAME_SIZE setting.
75
76
77
|
# File 'lib/protocol/http2/connection.rb', line 75
def maximum_frame_size
@remote_settings.maximum_frame_size
end
|
#next_stream_id ⇒ Object
Streams are identified with an unsigned 31-bit integer. Streams initiated by a client MUST use odd-numbered stream identifiers; those initiated by the server MUST use even-numbered stream identifiers. A stream identifier of zero (0x0) is used for connection control messages; the stream identifier of zero cannot be used to establish a new stream.
132
133
134
135
136
137
138
|
# File 'lib/protocol/http2/connection.rb', line 132
def next_stream_id
id = @local_stream_id
@local_stream_id += 2
return id
end
|
#open! ⇒ Object
273
274
275
276
277
|
# File 'lib/protocol/http2/connection.rb', line 273
def open!
@state = :open
return self
end
|
#process_settings(frame) ⇒ Boolean
In addition to changing the flow-control window for streams that are not yet active, a SETTINGS frame can alter the initial flow-control window size for streams with active flow-control windows (that is, streams in the “open” or “half-closed (remote)” state). When the value of SETTINGS_INITIAL_WINDOW_SIZE changes, a receiver MUST adjust the size of all stream flow-control windows that it maintains by the difference between the new value and the old value.
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
# File 'lib/protocol/http2/connection.rb', line 250
def process_settings(frame)
if frame.acknowledgement?
changes = @local_settings.acknowledge
update_local_settings(changes)
return true
else
reply = frame.acknowledge
write_frame(reply)
changes = frame.unpack
@remote_settings.update(changes)
update_remote_settings(changes)
return false
end
end
|
#read_frame ⇒ Object
Reads one frame from the network and processes. Processing the frame updates the state of the connection and related streams. If the frame triggers an error, e.g. a protocol error, the connection will typically emit a goaway frame and re-raise the exception. You should continue processing frames until the underlying connection is closed.
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
# File 'lib/protocol/http2/connection.rb', line 159
def read_frame
frame = @framer.read_frame(@local_settings.maximum_frame_size)
return if ignore_frame?(frame)
yield frame if block_given?
frame.apply(self)
return frame
rescue GoawayError => error
raise
rescue ProtocolError => error
send_goaway(error.code || PROTOCOL_ERROR, error.message)
raise
rescue HPACK::Error => error
send_goaway(COMPRESSION_ERROR, error.message)
raise
end
|
#receive_continuation(frame) ⇒ Object
508
509
510
|
# File 'lib/protocol/http2/connection.rb', line 508
def receive_continuation(frame)
raise ProtocolError, "Received unexpected continuation: #{frame.class}"
end
|
#receive_data(frame) ⇒ Object
317
318
319
320
321
322
323
324
325
326
327
|
# File 'lib/protocol/http2/connection.rb', line 317
def receive_data(frame)
update_local_window(frame)
if stream = @streams[frame.stream_id]
stream.receive_data(frame)
elsif closed_stream_id?(frame.stream_id)
else
raise ProtocolError, "Cannot receive data for stream id #{frame.stream_id}"
end
end
|
#receive_frame(frame) ⇒ Object
512
513
514
|
# File 'lib/protocol/http2/connection.rb', line 512
def receive_frame(frame)
end
|
#receive_goaway(frame) ⇒ Object
209
210
211
212
213
214
215
216
217
218
219
|
# File 'lib/protocol/http2/connection.rb', line 209
def receive_goaway(frame)
@remote_stream_id, error_code, message = frame.unpack
self.close!
if error_code != 0
raise GoawayError.new(message, error_code)
end
end
|
On the server side, starts a new request.
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
|
# File 'lib/protocol/http2/connection.rb', line 366
def (frame)
stream_id = frame.stream_id
if stream_id.zero?
raise ProtocolError, "Cannot receive headers for stream 0!"
end
if stream = @streams[stream_id]
stream.(frame)
else
if stream_id <= @remote_stream_id
raise ProtocolError, "Invalid stream id: #{stream_id} <= #{@remote_stream_id}!"
end
if @streams.size < self.maximum_concurrent_streams
stream = accept_stream(stream_id)
@remote_stream_id = stream_id
stream.(frame)
else
raise ProtocolError, "Exceeded maximum concurrent streams"
end
end
end
|
#receive_ping(frame) ⇒ Object
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
|
# File 'lib/protocol/http2/connection.rb', line 301
def receive_ping(frame)
if @state != :closed
if frame.stream_id != 0
raise ProtocolError, "Ping received for non-zero stream!"
end
unless frame.acknowledgement?
reply = frame.acknowledge
write_frame(reply)
end
else
raise ProtocolError, "Cannot receive ping in state #{@state}"
end
end
|
#receive_priority(frame) ⇒ Object
Sets the priority for an incoming stream.
417
418
419
420
421
422
423
|
# File 'lib/protocol/http2/connection.rb', line 417
def receive_priority(frame)
if dependency = @dependencies[frame.stream_id]
dependency.receive_priority(frame)
elsif idle_stream_id?(frame.stream_id)
Dependency.create(self, frame.stream_id, frame.unpack)
end
end
|
#receive_push_promise(frame) ⇒ Object
425
426
427
|
# File 'lib/protocol/http2/connection.rb', line 425
def receive_push_promise(frame)
raise ProtocolError, "Unable to receive push promise!"
end
|
#receive_reset_stream(frame) ⇒ Object
458
459
460
461
462
463
464
465
466
467
468
|
# File 'lib/protocol/http2/connection.rb', line 458
def receive_reset_stream(frame)
if frame.connection?
raise ProtocolError, "Cannot reset connection!"
elsif stream = @streams[frame.stream_id]
stream.receive_reset_stream(frame)
elsif closed_stream_id?(frame.stream_id)
else
raise StreamClosed, "Cannot reset stream #{frame.stream_id}"
end
end
|
#receive_settings(frame) ⇒ Object
279
280
281
282
283
284
285
286
287
288
|
# File 'lib/protocol/http2/connection.rb', line 279
def receive_settings(frame)
if @state == :new
open! if process_settings(frame)
elsif @state != :closed
process_settings(frame)
else
raise ProtocolError, "Cannot receive settings in state #{@state}"
end
end
|
#receive_window_update(frame) ⇒ Object
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
|
# File 'lib/protocol/http2/connection.rb', line 489
def receive_window_update(frame)
if frame.connection?
super
self.consume_window
elsif stream = @streams[frame.stream_id]
begin
stream.receive_window_update(frame)
rescue ProtocolError => error
stream.send_reset_stream(error.code)
end
elsif closed_stream_id?(frame.stream_id)
else
raise ProtocolError, "Cannot update window of idle stream #{frame.stream_id}"
end
end
|
#send_goaway(error_code = 0, message = "") ⇒ Object
Tell the remote end that the connection is being shut down. If the ‘error_code` is 0, this is a graceful shutdown. The other end of the connection should not make any new streams, but existing streams may be completed.
200
201
202
203
204
205
206
207
|
# File 'lib/protocol/http2/connection.rb', line 200
def send_goaway(error_code = 0, message = "")
frame = GoawayFrame.new
frame.pack @remote_stream_id, error_code, message
write_frame(frame)
ensure
self.close!
end
|
#send_ping(data) ⇒ Object
290
291
292
293
294
295
296
297
298
299
|
# File 'lib/protocol/http2/connection.rb', line 290
def send_ping(data)
if @state != :closed
frame = PingFrame.new
frame.pack data
write_frame(frame)
else
raise ProtocolError, "Cannot send ping in state #{@state}"
end
end
|
#send_priority(stream_id, priority) ⇒ Object
391
392
393
394
395
396
|
# File 'lib/protocol/http2/connection.rb', line 391
def send_priority(stream_id, priority)
frame = PriorityFrame.new(stream_id)
frame.pack(priority)
write_frame(frame)
end
|
#send_settings(changes) ⇒ Object
183
184
185
186
187
188
189
190
|
# File 'lib/protocol/http2/connection.rb', line 183
def send_settings(changes)
@local_settings.append(changes)
frame = SettingsFrame.new
frame.pack(changes)
write_frame(frame)
end
|
#server_stream_id?(id) ⇒ Boolean
433
434
435
|
# File 'lib/protocol/http2/connection.rb', line 433
def server_stream_id?(id)
id.even?
end
|
#update_local_settings(changes) ⇒ Object
229
230
231
232
233
234
235
236
237
|
# File 'lib/protocol/http2/connection.rb', line 229
def update_local_settings(changes)
capacity = @local_settings.initial_window_size
@streams.each_value do |stream|
stream.local_window.capacity = capacity
end
@local_window.desired = capacity
end
|
#update_remote_settings(changes) ⇒ Object
239
240
241
242
243
244
245
|
# File 'lib/protocol/http2/connection.rb', line 239
def update_remote_settings(changes)
capacity = @remote_settings.initial_window_size
@streams.each_value do |stream|
stream.remote_window.capacity = capacity
end
end
|
#valid_remote_stream_id? ⇒ Boolean
329
330
331
|
# File 'lib/protocol/http2/connection.rb', line 329
def valid_remote_stream_id?
false
end
|
#write_frame(frame) ⇒ Object
221
222
223
|
# File 'lib/protocol/http2/connection.rb', line 221
def write_frame(frame)
@framer.write_frame(frame)
end
|
#write_frames {|@framer| ... } ⇒ Object
225
226
227
|
# File 'lib/protocol/http2/connection.rb', line 225
def write_frames
yield @framer
end
|