Class: Async::HTTP::Protocol::HTTP2::Stream

Inherits:
Protocol::HTTP2::Stream
  • Object
show all
Defined in:
lib/async/http/protocol/http2/stream.rb

Direct Known Subclasses

Request::Stream, Response::Stream

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Stream

Returns a new instance of Stream.



18
19
20
21
22
23
24
25
26
27
28
29
 
# File 'lib/async/http/protocol/http2/stream.rb', line 18

def initialize(*)
	super
	
	@headers = nil
	
	# Input buffer, reading request body, or response body (receive_data):
	@length = nil
	@input = nil
	
	# Output buffer, writing request body or response body (window_updated):
	@output = nil
end

Instance Attribute Details

#headers ⇒ Object

Returns the value of attribute headers.



31
32
33
 
# File 'lib/async/http/protocol/http2/stream.rb', line 31

def headers
  @headers
end

#input ⇒ Object (readonly)

Returns the value of attribute input.



33
34
35
 
# File 'lib/async/http/protocol/http2/stream.rb', line 33

def input
  @input
end

Instance Method Details

#add_header(key, value) ⇒ Object 



35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/async/http/protocol/http2/stream.rb', line 35

def add_header(key, value)
	if key == CONNECTION
		raise ::Protocol::HTTP2::HeaderError, "Connection header is not allowed!"
	elsif key.start_with? ':'
		raise ::Protocol::HTTP2::HeaderError, "Invalid pseudo-header #{key}!"
	elsif key =~ /[A-Z]/
		raise ::Protocol::HTTP2::HeaderError, "Invalid upper-case characters in header #{key}!"
	else
		@headers.add(key, value)
	end
end

#closed(error) ⇒ Object

When the stream transitions to the closed state, this method is called. There are roughly two ways this can happen:

  • A frame is received which causes this stream to enter the closed state. This method will be invoked from the background reader task.

  • A frame is sent which causes this stream to enter the closed state. This method will be invoked from that task.

While the input stream is relatively straight forward, the output stream can trigger the second case above



148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
 
# File 'lib/async/http/protocol/http2/stream.rb', line 148

def closed(error)
	super
	
	if @input
		@input.close(error)
		@input = nil
	end
	
	if @output
		@output.stop(error)
		@output = nil
	end
	
	return self
end

#finish_output(error = nil) ⇒ Object

Called when the output terminates normally.



121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
 
# File 'lib/async/http/protocol/http2/stream.rb', line 121

def finish_output(error = nil)
	trailer = @output&.trailer
	
	@output = nil
	
	if error
		send_reset_stream(::Protocol::HTTP2::Error::INTERNAL_ERROR)
	else
		# Write trailer?
		if trailer&.any?
			send_headers(nil, trailer, ::Protocol::HTTP2::END_STREAM)
		else
			send_data(nil, ::Protocol::HTTP2::END_STREAM)
		end
	end
end

#prepare_input(length) ⇒ Input

Prepare the input stream which will be used for incoming data frames.

Returns:

  • (Input) —

    the input body.



77
78
79
80
81
82
83
 
# File 'lib/async/http/protocol/http2/stream.rb', line 77

def prepare_input(length)
	if @input.nil?
		@input = Input.new(self, length)
	else
		raise ArgumentError, "Input body already prepared!"
	end
end

#process_data(frame) ⇒ Object 



92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
 
# File 'lib/async/http/protocol/http2/stream.rb', line 92

def process_data(frame)
	data = frame.unpack
	
	if @input
		unless data.empty?
			@input.write(data)
		end
		
		if frame.end_stream?
			@input.close
			@input = nil
		end
	end
	
	return data
rescue ::Protocol::HTTP2::ProtocolError
	raise
rescue # Anything else...
	send_reset_stream(::Protocol::HTTP2::Error::INTERNAL_ERROR)
end

#process_headers(frame) ⇒ Object 



53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
 
# File 'lib/async/http/protocol/http2/stream.rb', line 53

def process_headers(frame)
	if @headers and frame.end_stream?
		self.receive_trailing_headers(super, frame.end_stream?)
	else
		self.receive_initial_headers(super, frame.end_stream?)
	end
	
	# TODO this might need to be in an ensure block:
	if @input and frame.end_stream?
		@input.close($!)
		@input = nil
	end
rescue ::Protocol::HTTP2::HeaderError => error
	Console.logger.debug(self, error)
	
	send_reset_stream(error.code)
end

#receive_trailing_headers(headers, end_stream) ⇒ Object 



47
48
49
50
51
 
# File 'lib/async/http/protocol/http2/stream.rb', line 47

def receive_trailing_headers(headers, end_stream)
	headers.each do |key, value|
		add_header(key, value)
	end
end

#send_body(body, trailer = nil) ⇒ Object

Set the body and begin sending it.



114
115
116
117
118
 
# File 'lib/async/http/protocol/http2/stream.rb', line 114

def send_body(body, trailer = nil)
	@output = Output.new(self, body, trailer)
	
	@output.start
end

#update_local_window(frame) ⇒ Object 



85
86
87
88
89
90
 
# File 'lib/async/http/protocol/http2/stream.rb', line 85

def update_local_window(frame)
	consume_local_window(frame)
	
	# This is done on demand in `Input#read`:
	# request_window_update
end

#wait_for_input ⇒ Object 



71
72
73
 
# File 'lib/async/http/protocol/http2/stream.rb', line 71

def wait_for_input
	return @input
end

#window_updated(size) ⇒ Object 



138
139
140
141
142
 
# File 'lib/async/http/protocol/http2/stream.rb', line 138

def window_updated(size)
	super
	
	@output&.window_updated(size)
end