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

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

Overview

A server that supports both HTTP1.0 and HTTP1.1 semantics by detecting the version of the request.

Constant Summary collapse

HTTPS = 
'https'.freeze
SCHEME = 
':scheme'.freeze
METHOD = 
':method'.freeze
PATH = 
':path'.freeze
AUTHORITY = 
':authority'.freeze
REASON = 
':reason'.freeze
STATUS = 
':status'.freeze
VERSION = 
'HTTP/2.0'.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(controller, stream) ⇒ HTTP2

Returns a new instance of HTTP2.



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
 
# File 'lib/async/http/protocol/http2.rb', line 52

def initialize(controller, stream)
	@controller = controller
	@stream = stream
	
	@controller.on(:frame) do |data|
		@stream.write(data)
		@stream.flush
	end
	
	@controller.on(:frame_sent) do |frame|
		Async.logger.debug(self) {"Sent frame: #{frame.inspect}"}
	end
	
	@controller.on(:frame_received) do |frame|
		Async.logger.debug(self) {"Received frame: #{frame.inspect}"}
	end
	
	@controller.on(:goaway) do |payload|
		Async.logger.error(self) {"goaway: #{payload.inspect}"}
		
		@reader.stop
		@stream.io.close
	end
	
	@count = 0
end

Instance Attribute Details

#count ⇒ Object (readonly)

Returns the value of attribute count.



79
80
81
 
# File 'lib/async/http/protocol/http2.rb', line 79

def count
  @count
end

Class Method Details

.client(stream) ⇒ Object 



35
36
37
 
# File 'lib/async/http/protocol/http2.rb', line 35

def self.client(stream)
	self.new(::HTTP2::Client.new, stream)
end

.server(stream) ⇒ Object 



39
40
41
 
# File 'lib/async/http/protocol/http2.rb', line 39

def self.server(stream)
	self.new(::HTTP2::Server.new, stream)
end

Instance Method Details

#call(request) ⇒ Object 



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
 
# File 'lib/async/http/protocol/http2.rb', line 187

def call(request)
	request.version ||= self.version
	
	stream = @controller.new_stream
	@count += 1
	
	headers = {
		SCHEME => HTTPS,
		METHOD => request.method.to_s,
		PATH => request.path.to_s,
		AUTHORITY => request.authority.to_s,
	}.merge(request.headers)
	
	finished = Async::Notification.new
	
	exception = nil
	response = Response.new
	response.version = self.version
	response.headers = {}
	body = Body::Writable.new
	response.body = body
	
	stream.on(:headers) do |headers|
		headers.each do |key, value|
			if key == STATUS
				response.status = value.to_i
			elsif key == REASON
				response.reason = value
			else
				response.headers[key] = value
			end
		end
		
		# At this point, we are now expecting two events: data and close.
		stream.on(:close) do |error|
			# If we receive close after this point, it's not a request error, but a failure we need to signal to the body.
			if error
				body.stop(EOFError.new(error))
			else
				body.finish
			end
		end
		
		finished.signal
	end
	
	stream.on(:data) do |chunk|
		body.write(chunk.to_s) unless chunk.empty?
	end
	
	stream.on(:close) do |error|
		# The remote server has closed the connection while we were sending the request.
		if error
			exception = EOFError.new(error)
			finished.signal
		end
	end
	
	if request.body.nil? or request.body.empty?
		stream.headers(headers, end_stream: true)
		request.body.read if request.body
	else
		begin
			stream.headers(headers, end_stream: false)
		rescue
			raise RequestFailed.new
		end
		
		request.body.each do |chunk|
			stream.data(chunk, end_stream: false)
		end
			
		stream.data("", end_stream: true)
	end
	
	start_connection
	@stream.flush
	
	Async.logger.debug(self) {"Stream flushed, waiting for signal."}
	finished.wait
	
	if exception
		raise exception
	end
	
	Async.logger.debug(self) {"Stream finished: #{response.inspect}"}
	return response
end

#close ⇒ Object 



110
111
112
113
114
115
 
# File 'lib/async/http/protocol/http2.rb', line 110

def close
	Async.logger.debug(self) {"Closing connection"}
	
	@reader.stop if @reader
	@stream.close
end

#multiplex ⇒ Object

Multiple requests can be processed at the same time.



82
83
84
 
# File 'lib/async/http/protocol/http2.rb', line 82

def multiplex
	@controller.remote_settings[:settings_max_concurrent_streams]
end

#read_in_background(task: Task.current) ⇒ Object 



98
99
100
101
102
103
104
105
106
107
108
 
# File 'lib/async/http/protocol/http2.rb', line 98

def read_in_background(task: Task.current)
	task.async do |nested_task|
		nested_task.annotate("#{version} reading data")
		
		while buffer = @stream.read_partial
			@controller << buffer
		end
		
		Async.logger.debug(self) {"Connection reset by peer!"}
	end
end

#receive_requests(task: Task.current, &block) ⇒ Object 



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
 
# File 'lib/async/http/protocol/http2.rb', line 117

def receive_requests(task: Task.current, &block)
	# emits new streams opened by the client
	@controller.on(:stream) do |stream|
		request = Request.new
		request.version = self.version
		request.headers = Headers.new
		body = Body::Writable.new
		request.body = body
		
		stream.on(:headers) do |headers|
			headers.each do |key, value|
				if key == METHOD
					request.method = value
				elsif key == PATH
					request.path = value
				elsif key == AUTHORITY
					request.authority = value
				else
					request.headers[key] = value
				end
			end
		end
		
		stream.on(:data) do |chunk|
			# puts "Got request data: #{chunk.inspect}"
			body.write(chunk.to_s) unless chunk.empty?
		end
		
		stream.on(:close) do |error|
			if error
				body.stop(EOFError.new(error))
			end
		end
		
		stream.on(:half_close) do
			begin
				# We are no longer receiving any more data frames:
				body.finish
				
				# Generate the response:
				response = yield request
				
				headers = {STATUS => response.status.to_s}
				headers.update(response.headers)
				
				if response.body.nil? or response.body.empty?
					stream.headers(headers, end_stream: true)
					response.body.read if response.body
				else
					stream.headers(headers, end_stream: false)
					
					response.body.each do |chunk|
						stream.data(chunk, end_stream: false)
					end
					
					stream.data("", end_stream: true)
				end
			rescue
				Async.logger.error(self) {$!}
				
				# Generating the response failed.
				stream.close(:internal_error)
			end
		end
	end
	
	start_connection
	@reader.wait
end

#reusable? ⇒ Boolean

Returns:

  • (Boolean) 


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

def reusable?
	!@stream.closed?
end

#start_connection ⇒ Object 



94
95
96
 
# File 'lib/async/http/protocol/http2.rb', line 94

def start_connection
	@reader ||= read_in_background
end

#version ⇒ Object 



90
91
92
 
# File 'lib/async/http/protocol/http2.rb', line 90

def version
	VERSION
end