Class: Anyt::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/anyt/client.rb

Overview

Synchronous websocket client Based on github.com/rails/rails/blob/v5.0.1/actioncable/test/client_test.rb

Defined Under Namespace

Classes: TimeoutError

Constant Summary collapse

WAIT_WHEN_EXPECTING_EVENT = 
5
WAIT_WHEN_NOT_EXPECTING_EVENT = 
0.5

Instance Method Summary collapse

Constructor Details

#initialize(ignore: [], url: Anyt.config.target_url, qs: "", cookies: "", headers: {}) ⇒ Client

rubocop: disable Metrics/AbcSize rubocop: disable Metrics/MethodLength rubocop: disable Metrics/BlockLength



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
 
# File 'lib/anyt/client.rb', line 18

def initialize(
  ignore: [], url: Anyt.config.target_url, qs: "",
  cookies: "", headers: {}
)
  ignore_message_types = @ignore_message_types = ignore
  messages = @messages = Queue.new
  closed = @closed = Concurrent::Event.new
  has_messages = @has_messages = Concurrent::Semaphore.new(0)

  headers = headers.merge('cookie' => cookies)

  open = Concurrent::Promise.new

  @ws = WebSocket::Client::Simple.connect(
    url + "?#{qs}",
    headers: headers
  ) do |ws|
    ws.on(:error) do |event|
      event = RuntimeError.new(event.message) unless event.is_a?(Exception)

      if open.pending?
        open.fail(event)
      else
        messages << event
        has_messages.release
      end
    end

    ws.on(:open) do |_event|
      open.set(true)
    end

    ws.on(:message) do |event|
      if event.type == :close
        closed.set
      else
        message = JSON.parse(event.data)

        next if ignore_message_types.include?(message["type"])

        AnyCable.logger.debug "Message received: #{message}"

        messages << message
        has_messages.release
      end
    end

    ws.on(:close) do |_event|
      closed.set
    end
  end

  open.wait!(WAIT_WHEN_EXPECTING_EVENT)
end

Instance Method Details

#close ⇒ Object 



90
91
92
93
94
95
96
97
 
# File 'lib/anyt/client.rb', line 90

def close
  sleep WAIT_WHEN_NOT_EXPECTING_EVENT

  raise "#{@messages.size} messages unprocessed" unless @messages.empty?

  @ws.close
  wait_for_close
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


103
104
105
 
# File 'lib/anyt/client.rb', line 103

def closed?
  @closed.set?
end

#receive(timeout: WAIT_WHEN_EXPECTING_EVENT) ⇒ Object

rubocop: enable Metrics/BlockLength rubocop: enable Metrics/AbcSize rubocop: enable Metrics/MethodLength

Raises:



76
77
78
79
80
81
82
83
84
 
# File 'lib/anyt/client.rb', line 76

def receive(timeout: WAIT_WHEN_EXPECTING_EVENT)
  raise TimeoutError, "Timed out to receive message" unless
    @has_messages.try_acquire(1, timeout)

  msg = @messages.pop(true)
  raise msg if msg.is_a?(Exception)

  msg
end

#send(message) ⇒ Object 



86
87
88
 
# File 'lib/anyt/client.rb', line 86

def send(message)
  @ws.send(JSON.generate(message))
end

#wait_for_close ⇒ Object 



99
100
101
 
# File 'lib/anyt/client.rb', line 99

def wait_for_close
  @closed.wait(WAIT_WHEN_EXPECTING_EVENT)
end