aboutsummaryrefslogtreecommitdiffstats
path: root/actioncable/test/client_test.rb
blob: 98a114a5f47f528780fc3b347e6a9241afa8775d (plain) (blame)
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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
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
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
require "test_helper"
require "concurrent"

require "websocket-client-simple"
require "json"

require "active_support/hash_with_indifferent_access"

####
# 😷 Warning suppression 😷
WebSocket::Frame::Handler::Handler03.prepend Module.new {
  def initialize(*)
    @application_data_buffer = nil
    super
  end
}

WebSocket::Frame::Data.prepend Module.new {
  def initialize(*)
    @masking_key = nil
    super
  end
}
#
####

class ClientTest < ActionCable::TestCase
  WAIT_WHEN_EXPECTING_EVENT = 2
  WAIT_WHEN_NOT_EXPECTING_EVENT = 0.5

  class EchoChannel < ActionCable::Channel::Base
    def subscribed
      stream_from "global"
    end

    def unsubscribed
      "Goodbye from EchoChannel!"
    end

    def ding(data)
      transmit(dong: data["message"])
    end

    def delay(data)
      sleep 1
      transmit(dong: data["message"])
    end

    def bulk(data)
      ActionCable.server.broadcast "global", wide: data["message"]
    end
  end

  def setup
    ActionCable.instance_variable_set(:@server, nil)
    server = ActionCable.server
    server.config.logger = Logger.new(StringIO.new).tap { |l| l.level = Logger::UNKNOWN }

    server.config.cable = ActiveSupport::HashWithIndifferentAccess.new(adapter: "async")

    # and now the "real" setup for our test:
    server.config.disable_request_forgery_protection = true
  end

  def with_puma_server(rack_app = ActionCable.server, port = 3099)
    server = ::Puma::Server.new(rack_app, ::Puma::Events.strings)
    server.add_tcp_listener "127.0.0.1", port
    server.min_threads = 1
    server.max_threads = 4

    t = Thread.new { server.run.join }
    yield port

  ensure
    server.stop(true) if server
    t.join if t
  end

  class SyncClient
    attr_reader :pings

    def initialize(port)
      messages = @messages = Queue.new
      closed = @closed = Concurrent::Event.new
      has_messages = @has_messages = Concurrent::Semaphore.new(0)
      pings = @pings = Concurrent::AtomicFixnum.new(0)

      open = Concurrent::Promise.new

      @ws = WebSocket::Client::Simple.connect("ws://127.0.0.1:#{port}/") 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)
            if message["type"] == "ping"
              pings.increment
            else
              messages << message
              has_messages.release
            end
          end
        end

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

      open.wait!(WAIT_WHEN_EXPECTING_EVENT)
    end

    def read_message
      @has_messages.try_acquire(1, WAIT_WHEN_EXPECTING_EVENT)

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

      msg
    end

    def read_messages(expected_size = 0)
      list = []
      loop do
        if @has_messages.try_acquire(1, list.size < expected_size ? WAIT_WHEN_EXPECTING_EVENT : WAIT_WHEN_NOT_EXPECTING_EVENT)
          msg = @messages.pop(true)
          raise msg if msg.is_a?(Exception)

          list << msg
        else
          break
        end
      end
      list
    end

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

    def close
      sleep WAIT_WHEN_NOT_EXPECTING_EVENT

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

      @ws.close
      wait_for_close
    end

    def wait_for_close
      @closed.wait(WAIT_WHEN_EXPECTING_EVENT)
    end

    def closed?
      @closed.set?
    end
  end

  def websocket_client(port)
    SyncClient.new(port)
  end

  def concurrently(enum)
    enum.map { |*x| Concurrent::Future.execute { yield(*x) } }.map(&:value!)
  end

  def test_single_client
    with_puma_server do |port|
      c = websocket_client(port)
      assert_equal({ "type" => "welcome" }, c.read_message)  # pop the first welcome message off the stack
      c.send_message command: "subscribe", identifier: JSON.generate(channel: "ClientTest::EchoChannel")
      assert_equal({ "identifier" => "{\"channel\":\"ClientTest::EchoChannel\"}", "type" => "confirm_subscription" }, c.read_message)
      c.send_message command: "message", identifier: JSON.generate(channel: "ClientTest::EchoChannel"), data: JSON.generate(action: "ding", message: "hello")
      assert_equal({ "identifier" => "{\"channel\":\"ClientTest::EchoChannel\"}", "message" => { "dong" => "hello" } }, c.read_message)
      c.close
    end
  end

  def test_interacting_clients
    with_puma_server do |port|
      clients = concurrently(10.times) { websocket_client(port) }

      barrier_1 = Concurrent::CyclicBarrier.new(clients.size)
      barrier_2 = Concurrent::CyclicBarrier.new(clients.size)

      concurrently(clients) do |c|
        assert_equal({ "type" => "welcome" }, c.read_message)  # pop the first welcome message off the stack
        c.send_message command: "subscribe", identifier: JSON.generate(channel: "ClientTest::EchoChannel")
        assert_equal({ "identifier" => '{"channel":"ClientTest::EchoChannel"}', "type" => "confirm_subscription" }, c.read_message)
        c.send_message command: "message", identifier: JSON.generate(channel: "ClientTest::EchoChannel"), data: JSON.generate(action: "ding", message: "hello")
        assert_equal({ "identifier" => '{"channel":"ClientTest::EchoChannel"}', "message" => { "dong" => "hello" } }, c.read_message)
        barrier_1.wait WAIT_WHEN_EXPECTING_EVENT
        c.send_message command: "message", identifier: JSON.generate(channel: "ClientTest::EchoChannel"), data: JSON.generate(action: "bulk", message: "hello")
        barrier_2.wait WAIT_WHEN_EXPECTING_EVENT
        assert_equal clients.size, c.read_messages(clients.size).size
      end

      concurrently(clients, &:close)
    end
  end

  def test_many_clients
    with_puma_server do |port|
      clients = concurrently(100.times) { websocket_client(port) }

      concurrently(clients) do |c|
        assert_equal({ "type" => "welcome" }, c.read_message)  # pop the first welcome message off the stack
        c.send_message command: "subscribe", identifier: JSON.generate(channel: "ClientTest::EchoChannel")
        assert_equal({ "identifier" => '{"channel":"ClientTest::EchoChannel"}', "type" => "confirm_subscription" }, c.read_message)
        c.send_message command: "message", identifier: JSON.generate(channel: "ClientTest::EchoChannel"), data: JSON.generate(action: "ding", message: "hello")
        assert_equal({ "identifier" => '{"channel":"ClientTest::EchoChannel"}', "message" => { "dong" => "hello" } }, c.read_message)
      end

      concurrently(clients, &:close)
    end
  end

  def test_disappearing_client
    with_puma_server do |port|
      c = websocket_client(port)
      assert_equal({ "type" => "welcome" }, c.read_message)  # pop the first welcome message off the stack
      c.send_message command: "subscribe", identifier: JSON.generate(channel: "ClientTest::EchoChannel")
      assert_equal({ "identifier" => "{\"channel\":\"ClientTest::EchoChannel\"}", "type" => "confirm_subscription" }, c.read_message)
      c.send_message command: "message", identifier: JSON.generate(channel: "ClientTest::EchoChannel"), data: JSON.generate(action: "delay", message: "hello")
      c.close # disappear before write

      c = websocket_client(port)
      assert_equal({ "type" => "welcome" }, c.read_message) # pop the first welcome message off the stack
      c.send_message command: "subscribe", identifier: JSON.generate(channel: "ClientTest::EchoChannel")
      assert_equal({ "identifier" => "{\"channel\":\"ClientTest::EchoChannel\"}", "type" => "confirm_subscription" }, c.read_message)
      c.send_message command: "message", identifier: JSON.generate(channel: "ClientTest::EchoChannel"), data: JSON.generate(action: "ding", message: "hello")
      assert_equal({ "identifier" => '{"channel":"ClientTest::EchoChannel"}', "message" => { "dong" => "hello" } }, c.read_message)
      c.close # disappear before read
    end
  end

  def test_unsubscribe_client
    with_puma_server do |port|
      app = ActionCable.server
      identifier = JSON.generate(channel: "ClientTest::EchoChannel")

      c = websocket_client(port)
      assert_equal({ "type" => "welcome" }, c.read_message)
      c.send_message command: "subscribe", identifier: identifier
      assert_equal({ "identifier" => "{\"channel\":\"ClientTest::EchoChannel\"}", "type" => "confirm_subscription" }, c.read_message)
      assert_equal(1, app.connections.count)
      assert(app.remote_connections.where(identifier: identifier))

      subscriptions = app.connections.first.subscriptions.send(:subscriptions)
      assert_not_equal 0, subscriptions.size, "Missing EchoChannel subscription"
      channel = subscriptions.first[1]
      channel.expects(:unsubscribed)
      c.close
      sleep 0.1 # Data takes a moment to process

      # All data is removed: No more connection or subscription information!
      assert_equal(0, app.connections.count)
    end
  end

  def test_server_restart
    with_puma_server do |port|
      c = websocket_client(port)
      assert_equal({ "type" => "welcome" }, c.read_message)
      c.send_message command: "subscribe", identifier: JSON.generate(channel: "ClientTest::EchoChannel")
      assert_equal({ "identifier" => "{\"channel\":\"ClientTest::EchoChannel\"}", "type" => "confirm_subscription" }, c.read_message)

      ActionCable.server.restart
      c.wait_for_close
      assert c.closed?
    end
  end
end