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require 'test_helper'
require 'concurrent'
require 'active_support/core_ext/hash/indifferent_access'
require 'pathname'
require 'faye/websocket'
require 'json'
class ClientTest < ActionCable::TestCase
WAIT_WHEN_EXPECTING_EVENT = 3
WAIT_WHEN_NOT_EXPECTING_EVENT = 0.2
def setup
# TODO: ActionCable requires a *lot* of setup at the moment...
::Object.const_set(:ApplicationCable, Module.new)
::ApplicationCable.const_set(:Connection, Class.new(ActionCable::Connection::Base))
::Object.const_set(:Rails, Module.new)
::Rails.singleton_class.send(:define_method, :root) { Pathname.new(__dir__) }
ActionCable.instance_variable_set(:@server, nil)
server = ActionCable.server
server.config = ActionCable::Server::Configuration.new
inner_logger = Logger.new(StringIO.new).tap { |l| l.level = Logger::UNKNOWN }
server.config.logger = ActionCable::Connection::TaggedLoggerProxy.new(inner_logger, tags: [])
server.config.cable = { adapter: 'async' }.with_indifferent_access
# and now the "real" setup for our test:
server.config.disable_request_forgery_protection = true
server.config.channel_load_paths = [File.expand_path('client', __dir__)]
Thread.new { EventMachine.run } unless EventMachine.reactor_running?
# faye-websocket is warning-rich
@previous_verbose, $VERBOSE = $VERBOSE, nil
end
def teardown
$VERBOSE = @previous_verbose
begin
::Object.send(:remove_const, :ApplicationCable)
rescue NameError
end
begin
::Object.send(:remove_const, :Rails)
rescue NameError
end
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)
@ws = Faye::WebSocket::Client.new("ws://127.0.0.1:#{port}/")
@messages = Queue.new
@closed = Concurrent::Event.new
@has_messages = Concurrent::Event.new
@pings = 0
open = Concurrent::Event.new
error = nil
@ws.on(:error) do |event|
if open.set?
@messages << RuntimeError.new(event.message)
else
error = event.message
open.set
end
end
@ws.on(:open) do |event|
open.set
end
@ws.on(:message) do |event|
hash = JSON.parse(event.data)
if hash['identifier'] == '_ping'
@pings += 1
else
@messages << hash
@has_messages.set
end
end
@ws.on(:close) do |event|
@closed.set
end
open.wait(WAIT_WHEN_EXPECTING_EVENT)
raise error if error
end
def read_message
@has_messages.wait(WAIT_WHEN_EXPECTING_EVENT) if @messages.empty?
@has_messages.reset if @messages.size < 2
msg = @messages.pop(true)
raise msg if msg.is_a?(Exception)
msg
end
def read_messages(expected_size = 0)
list = []
loop do
@has_messages.wait(list.size < expected_size ? WAIT_WHEN_EXPECTING_EVENT : WAIT_WHEN_NOT_EXPECTING_EVENT)
if @has_messages.set?
list << read_message
else
break
end
end
list
end
def send_message(hash)
@ws.send(JSON.dump(hash))
end
def close
sleep WAIT_WHEN_NOT_EXPECTING_EVENT
unless @messages.empty?
raise "#{@messages.size} messages unprocessed"
end
@ws.close
@closed.wait(WAIT_WHEN_EXPECTING_EVENT)
end
def close!
sock = BasicSocket.for_fd(@ws.instance_variable_get(:@stream).detach)
# Force a TCP reset
sock.setsockopt(Socket::SOL_SOCKET, Socket::SO_LINGER, [1, 0].pack('ii'))
sock.close
end
end
def faye_client(port)
SyncClient.new(port)
end
def test_single_client
with_puma_server do |port|
c = faye_client(port)
c.send_message command: 'subscribe', identifier: JSON.dump(channel: 'EchoChannel')
assert_equal({"identifier"=>"{\"channel\":\"EchoChannel\"}", "type"=>"confirm_subscription"}, c.read_message)
c.send_message command: 'message', identifier: JSON.dump(channel: 'EchoChannel'), data: JSON.dump(action: 'ding', message: 'hello')
assert_equal({"identifier"=>"{\"channel\":\"EchoChannel\"}", "message"=>{"dong"=>"hello"}}, c.read_message)
c.close
end
end
def test_interacting_clients
with_puma_server do |port|
clients = 10.times.map { faye_client(port) }
barrier_1 = Concurrent::CyclicBarrier.new(clients.size)
barrier_2 = Concurrent::CyclicBarrier.new(clients.size)
clients.map {|c| Concurrent::Future.execute {
c.send_message command: 'subscribe', identifier: JSON.dump(channel: 'EchoChannel')
assert_equal({"identifier"=>'{"channel":"EchoChannel"}', "type"=>"confirm_subscription"}, c.read_message)
c.send_message command: 'message', identifier: JSON.dump(channel: 'EchoChannel'), data: JSON.dump(action: 'ding', message: 'hello')
assert_equal({"identifier"=>'{"channel":"EchoChannel"}', "message"=>{"dong"=>"hello"}}, c.read_message)
barrier_1.wait WAIT_WHEN_EXPECTING_EVENT
c.send_message command: 'message', identifier: JSON.dump(channel: 'EchoChannel'), data: JSON.dump(action: 'bulk', message: 'hello')
barrier_2.wait WAIT_WHEN_EXPECTING_EVENT
assert_equal clients.size, c.read_messages(clients.size).size
} }.each(&:wait!)
clients.map {|c| Concurrent::Future.execute { c.close } }.each(&:wait!)
end
end
def test_many_clients
with_puma_server do |port|
clients = 200.times.map { faye_client(port) }
clients.map {|c| Concurrent::Future.execute {
c.send_message command: 'subscribe', identifier: JSON.dump(channel: 'EchoChannel')
assert_equal({"identifier"=>'{"channel":"EchoChannel"}', "type"=>"confirm_subscription"}, c.read_message)
c.send_message command: 'message', identifier: JSON.dump(channel: 'EchoChannel'), data: JSON.dump(action: 'ding', message: 'hello')
assert_equal({"identifier"=>'{"channel":"EchoChannel"}', "message"=>{"dong"=>"hello"}}, c.read_message)
} }.each(&:wait!)
clients.map {|c| Concurrent::Future.execute { c.close } }.each(&:wait!)
end
end
def test_disappearing_client
with_puma_server do |port|
c = faye_client(port)
c.send_message command: 'subscribe', identifier: JSON.dump(channel: 'EchoChannel')
assert_equal({"identifier"=>"{\"channel\":\"EchoChannel\"}", "type"=>"confirm_subscription"}, c.read_message)
c.send_message command: 'message', identifier: JSON.dump(channel: 'EchoChannel'), data: JSON.dump(action: 'delay', message: 'hello')
c.close # disappear before write
c = faye_client(port)
c.send_message command: 'subscribe', identifier: JSON.dump(channel: 'EchoChannel')
assert_equal({"identifier"=>"{\"channel\":\"EchoChannel\"}", "type"=>"confirm_subscription"}, c.read_message)
c.send_message command: 'message', identifier: JSON.dump(channel: 'EchoChannel'), data: JSON.dump(action: 'ding', message: 'hello')
assert_equal({"identifier"=>'{"channel":"EchoChannel"}', "message"=>{"dong"=>"hello"}}, c.read_message)
c.close # disappear before read
end
end
end
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