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# frozen_string_literal: true
# Licensed to the Software Freedom Conservancy (SFC) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The SFC licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
module Selenium
module WebDriver
#
# Base class implementing default behavior of service_manager object,
# responsible for starting and stopping driver implementations.
#
# @api private
#
class ServiceManager
START_TIMEOUT = 20
SOCKET_LOCK_TIMEOUT = 45
STOP_TIMEOUT = 20
#
# End users should use a class method for the desired driver, rather than using this directly.
#
# @api private
#
def initialize(config)
@executable_path = config.executable_path
@host = Platform.localhost
@port = config.port
@io = config.log
@extra_args = config.args
@shutdown_supported = config.shutdown_supported
raise Error::WebDriverError, "invalid port: #{@port}" if @port < 1
end
def start
raise "already started: #{uri.inspect} #{@executable_path.inspect}" if process_running?
Platform.exit_hook { stop } # make sure we don't leave the server running
socket_lock.locked do
find_free_port
start_process
connect_until_stable
end
end
def stop
return unless @shutdown_supported
return if process_exited?
stop_server
@process.poll_for_exit STOP_TIMEOUT
rescue ChildProcess::TimeoutError, Errno::ECONNREFUSED
nil # noop
ensure
stop_process
end
def uri
@uri ||= URI.parse("http://#{@host}:#{@port}")
end
private
def build_process(*command)
WebDriver.logger.debug("Executing Process #{command}", id: :driver_service)
@process = ChildProcess.build(*command)
@io ||= WebDriver.logger.io if WebDriver.logger.debug?
@process.io = @io if @io
@process
end
def connect_to_server
Net::HTTP.start(@host, @port) do |http|
http.open_timeout = STOP_TIMEOUT / 2
http.read_timeout = STOP_TIMEOUT / 2
yield http
end
end
def find_free_port
@port = PortProber.above(@port)
end
def start_process
@process = build_process(@executable_path, "--port=#{@port}", *@extra_args)
@process.start
end
def stop_process
return if process_exited?
@process.stop STOP_TIMEOUT
end
def stop_server
connect_to_server do |http|
headers = WebDriver::Remote::Http::Common::DEFAULT_HEADERS.dup
WebDriver.logger.debug('Sending shutdown request to server', id: :driver_service)
http.get('/shutdown', headers)
end
end
def process_running?
defined?(@process) && @process&.alive?
end
def process_exited?
@process.nil? || @process.exited?
end
def connect_until_stable
socket_poller = SocketPoller.new @host, @port, START_TIMEOUT
return if socket_poller.connected?
raise Error::WebDriverError, cannot_connect_error_text
end
def cannot_connect_error_text
"unable to connect to #{@executable_path} #{@host}:#{@port}"
end
def socket_lock
@socket_lock ||= SocketLock.new(@port - 1, SOCKET_LOCK_TIMEOUT)
end
end # Service
end # WebDriver
end # Selenium
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