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
Whether the connection is effectively or actually closed.
-
#closed_stream_id?(id) ⇒ Boolean
This is only valid if the stream doesn’t exist in ‘@streams`.
-
#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.
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#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
-
#synchronize ⇒ Object
-
#update_local_settings(changes) ⇒ Object
-
#update_remote_settings(changes) ⇒ Object
-
#valid_remote_stream_id?(stream_id) ⇒ Boolean
-
#write_frame(frame) ⇒ Object
-
#write_frames ⇒ 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.
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# File 'lib/protocol/http2/connection.rb', line 18
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
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Instance Attribute Details
#dependencies ⇒ Object
Returns the value of attribute dependencies.
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# File 'lib/protocol/http2/connection.rb', line 130
def dependencies
@dependencies
end
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#dependency ⇒ Object
Returns the value of attribute dependency.
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# File 'lib/protocol/http2/connection.rb', line 132
def dependency
@dependency
end
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#framer ⇒ Object
Returns the value of attribute framer.
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# File 'lib/protocol/http2/connection.rb', line 69
def framer
@framer
end
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#local_settings ⇒ Object
Current settings value for local and peer
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# File 'lib/protocol/http2/connection.rb', line 75
def local_settings
@local_settings
end
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#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.
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# File 'lib/protocol/http2/connection.rb', line 80
def local_window
@local_window
end
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#remote_settings ⇒ Object
Returns the value of attribute remote_settings.
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# File 'lib/protocol/http2/connection.rb', line 76
def remote_settings
@remote_settings
end
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#remote_stream_id ⇒ Object
The highest stream_id that has been successfully accepted by this connection.
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# File 'lib/protocol/http2/connection.rb', line 86
def remote_stream_id
@remote_stream_id
end
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#remote_window ⇒ Object
Our window for sending data. When we send data, it reduces this window.
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# File 'lib/protocol/http2/connection.rb', line 83
def remote_window
@remote_window
end
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#state ⇒ Object
Connection state (:new, :open, :closed).
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# File 'lib/protocol/http2/connection.rb', line 72
def state
@state
end
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#streams ⇒ Object
Returns the value of attribute streams.
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# File 'lib/protocol/http2/connection.rb', line 128
def streams
@streams
end
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Instance Method Details
#[](id) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 52
def [] id
if id.zero?
self
else
@streams[id]
end
end
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#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.
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# File 'lib/protocol/http2/connection.rb', line 350
def accept_push_promise_stream(stream_id, &block)
accept_stream(stream_id, &block)
end
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#accept_stream(stream_id, &block) ⇒ Object
Accept an incoming stream from the other side of the connnection. On the server side, we accept requests.
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# File 'lib/protocol/http2/connection.rb', line 339
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
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#client_stream_id?(id) ⇒ Boolean
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# File 'lib/protocol/http2/connection.rb', line 419
def client_stream_id?(id)
id.odd?
end
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#close(error = nil) ⇒ Object
Close the underlying framer and all streams.
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# File 'lib/protocol/http2/connection.rb', line 99
def close(error = nil)
@streams.each_value{|stream| stream.close(error)}
@streams.clear
ensure
if @framer
@framer.close
@framer = nil
end
end
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#close! ⇒ Object
Transition the connection into the closed state.
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# File 'lib/protocol/http2/connection.rb', line 186
def close!
@state = :closed
return self
end
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#closed? ⇒ Boolean
Whether the connection is effectively or actually closed.
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# File 'lib/protocol/http2/connection.rb', line 89
def closed?
@state == :closed || @framer.nil?
end
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#closed_stream_id?(id) ⇒ Boolean
This is only valid if the stream doesn’t exist in ‘@streams`.
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# File 'lib/protocol/http2/connection.rb', line 446
def closed_stream_id?(id)
if id.zero?
false
else
!idle_stream_id?(id)
end
end
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#consume_window(size = self.available_size) ⇒ Object
Traverse active streams in order of priority and allow them to consume the available flow-control window.
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# File 'lib/protocol/http2/connection.rb', line 469
def consume_window(size = self.available_size)
return unless size > 0
@dependency.consume_window(size)
end
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#create_push_promise_stream(&block) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 369
def create_push_promise_stream(&block)
create_stream(&block)
end
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#create_stream(id = next_stream_id, &block) ⇒ Stream
Create a stream, defaults to an outgoing stream. On the client side, we create requests.
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# File 'lib/protocol/http2/connection.rb', line 357
def create_stream(id = next_stream_id, &block)
if @streams.key?(id)
raise ProtocolError, "Cannot create stream with id #{id}, already exists!"
end
if block_given?
return yield(self, id)
else
return Stream.create(self, id)
end
end
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# File 'lib/protocol/http2/connection.rb', line 115
def (data)
HPACK::Decompressor.new(data, @decoder, table_size_limit: @local_settings.).decode
end
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#delete(id) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 93
def delete(id)
@streams.delete(id)
@dependencies[id]&.delete!
end
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# File 'lib/protocol/http2/connection.rb', line 111
def (, buffer = String.new.b)
HPACK::Compressor.new(buffer, @encoder, table_size_limit: @remote_settings.).encode()
end
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#id ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 48
def id
0
end
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#idle_stream_id?(id) ⇒ Boolean
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# File 'lib/protocol/http2/connection.rb', line 427
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
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#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.
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# File 'lib/protocol/http2/connection.rb', line 137
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
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#maximum_concurrent_streams ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 65
def maximum_concurrent_streams
@local_settings.maximum_concurrent_streams
end
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#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.
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# File 'lib/protocol/http2/connection.rb', line 61
def maximum_frame_size
@remote_settings.maximum_frame_size
end
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#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.
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# File 'lib/protocol/http2/connection.rb', line 120
def next_stream_id
id = @local_stream_id
@local_stream_id += 2
return id
end
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#open! ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 276
def open!
@state = :open
return self
end
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#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.
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# File 'lib/protocol/http2/connection.rb', line 253
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
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#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.
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# File 'lib/protocol/http2/connection.rb', line 151
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
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#receive_continuation(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 505
def receive_continuation(frame)
raise ProtocolError, "Received unexpected continuation: #{frame.class}"
end
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#receive_data(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 321
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
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#receive_frame(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 509
def receive_frame(frame)
end
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#receive_goaway(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 202
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
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On the server side, starts a new request.
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# File 'lib/protocol/http2/connection.rb', line 374
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
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#receive_ping(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 304
def receive_ping(frame)
if @state != :closed
unless frame.acknowledgement?
reply = frame.acknowledge
write_frame(reply)
end
else
raise ProtocolError, "Cannot receive ping in state #{@state}"
end
end
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#receive_priority(frame) ⇒ Object
Sets the priority for an incoming stream.
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# File 'lib/protocol/http2/connection.rb', line 407
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
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#receive_push_promise(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 415
def receive_push_promise(frame)
raise ProtocolError, "Unable to receive push promise!"
end
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#receive_reset_stream(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 455
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
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#receive_settings(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 282
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
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#receive_window_update(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 486
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
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#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.
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# File 'lib/protocol/http2/connection.rb', line 193
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
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#send_ping(data) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 293
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
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#send_priority(stream_id, priority) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 399
def send_priority(stream_id, priority)
frame = PriorityFrame.new(stream_id)
frame.pack(priority)
write_frame(frame)
end
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#send_settings(changes) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 176
def send_settings(changes)
@local_settings.append(changes)
frame = SettingsFrame.new
frame.pack(changes)
write_frame(frame)
end
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#server_stream_id?(id) ⇒ Boolean
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# File 'lib/protocol/http2/connection.rb', line 423
def server_stream_id?(id)
id.even?
end
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#synchronize ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 146
def synchronize
yield
end
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#update_local_settings(changes) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 232
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
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#update_remote_settings(changes) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 242
def update_remote_settings(changes)
capacity = @remote_settings.initial_window_size
@streams.each_value do |stream|
stream.remote_window.capacity = capacity
end
end
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#valid_remote_stream_id?(stream_id) ⇒ Boolean
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# File 'lib/protocol/http2/connection.rb', line 333
def valid_remote_stream_id?(stream_id)
false
end
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#write_frame(frame) ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 214
def write_frame(frame)
synchronize do
@framer.write_frame(frame)
@framer.flush
end
end
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#write_frames ⇒ Object
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# File 'lib/protocol/http2/connection.rb', line 221
def write_frames
if @framer
synchronize do
yield @framer
@framer.flush
end
else
raise EOFError, "Connection closed!"
end
end
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