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
|
module ActionCable
module Connection
class Base
include Identification
include InternalChannel
attr_reader :server, :env
delegate :worker_pool, :pubsub, to: :server
attr_reader :logger
def initialize(server, env)
@started_at = Time.now
@server, @env = server, env
@logger = TaggedLoggerProxy.new(server.logger, tags: log_tags)
@heartbeat = ActionCable::Connection::Heartbeat.new(self)
@subscriptions = ActionCable::Connection::Subscriptions.new(self)
@message_buffer = ActionCable::Connection::MessageBuffer.new(self)
end
def process
logger.info started_request_message
if websocket?
@websocket = Faye::WebSocket.new(@env)
@websocket.on(:open) { |event| send_async :on_open }
@websocket.on(:message) { |event| on_message event.data }
@websocket.on(:close) { |event| send_async :on_close }
@websocket.rack_response
else
respond_to_invalid_request
end
end
def receive(data_in_json)
if websocket_alive?
data = decode_json data_in_json
case data['command']
when 'subscribe' then subscriptions.add data
when 'unsubscribe' then subscriptions.remove data
when 'message' then process_message data
else
logger.error "Received unrecognized command in #{data.inspect}"
end
else
logger.error "Received data without a live websocket (#{data.inspect})"
end
end
def transmit(data)
@websocket.send data
end
def close
logger.error "Closing connection"
@websocket.close
end
def send_async(method, *arguments)
worker_pool.async.invoke(self, method, *arguments)
end
def statistics
{
identifier: connection_identifier,
started_at: @started_at,
subscriptions: subscriptions.identifiers
}
end
protected
def request
@request ||= ActionDispatch::Request.new(Rails.application.env_config.merge(env))
end
def cookies
request.cookie_jar
end
private
attr_reader :heartbeat, :subscriptions, :message_buffer
def on_open
server.add_connection(self)
connect if respond_to?(:connect)
subscribe_to_internal_channel
heartbeat.start
message_buffer.process!
end
def on_message(message)
message_buffer.append event.data
end
def on_close
logger.info finished_request_message
server.remove_connection(self)
subscriptions.cleanup
unsubscribe_from_internal_channel
heartbeat.stop
disconnect if respond_to?(:disconnect)
end
def process_message(message)
subscriptions.find(message['identifier']).perform_action decode_json(message['data'])
rescue Exception => e
logger.error "Could not process message (#{message.inspect})"
log_exception(e)
end
def decode_json(json)
ActiveSupport::JSON.decode json
end
def respond_to_invalid_request
logger.info finished_request_message
[ 404, { 'Content-Type' => 'text/plain' }, [ 'Page not found' ] ]
end
def websocket_alive?
@websocket && @websocket.ready_state == Faye::WebSocket::API::OPEN
end
def websocket?
@is_websocket ||= Faye::WebSocket.websocket?(@env)
end
def started_request_message
'Started %s "%s"%s for %s at %s' % [
request.request_method,
request.filtered_path,
websocket? ? ' [Websocket]' : '',
request.ip,
Time.now.to_default_s ]
end
def finished_request_message
'Finished "%s"%s for %s at %s' % [
request.filtered_path,
websocket? ? ' [Websocket]' : '',
request.ip,
Time.now.to_default_s ]
end
def log_exception(e)
logger.error "There was an exception: #{e.class} - #{e.message}"
logger.error e.backtrace.join("\n")
end
def log_tags
server.log_tags.map { |tag| tag.respond_to?(:call) ? tag.call(request) : tag.to_s.camelize }
end
end
end
end
|
