| # Copyright 2013 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """A "Test Server Spawner" that handles killing/stopping per-test test servers. |
| |
| It's used to accept requests from the device to spawn and kill instances of the |
| chrome test server on the host. |
| """ |
| # pylint: disable=W0702 |
| |
| import BaseHTTPServer |
| import json |
| import logging |
| import os |
| import select |
| import struct |
| import subprocess |
| import sys |
| import threading |
| import time |
| import urlparse |
| |
| from pylib import constants |
| from pylib import ports |
| |
| from pylib.forwarder import Forwarder |
| |
| |
| # Path that are needed to import necessary modules when launching a testserver. |
| os.environ['PYTHONPATH'] = os.environ.get('PYTHONPATH', '') + (':%s:%s:%s:%s:%s' |
| % (os.path.join(constants.DIR_SOURCE_ROOT, 'third_party'), |
| os.path.join(constants.DIR_SOURCE_ROOT, 'third_party', 'tlslite'), |
| os.path.join(constants.DIR_SOURCE_ROOT, 'third_party', 'pyftpdlib', |
| 'src'), |
| os.path.join(constants.DIR_SOURCE_ROOT, 'net', 'tools', 'testserver'), |
| os.path.join(constants.DIR_SOURCE_ROOT, 'sync', 'tools', 'testserver'))) |
| |
| |
| SERVER_TYPES = { |
| 'http': '', |
| 'ftp': '-f', |
| 'sync': '', # Sync uses its own script, and doesn't take a server type arg. |
| 'tcpecho': '--tcp-echo', |
| 'udpecho': '--udp-echo', |
| } |
| |
| |
| # The timeout (in seconds) of starting up the Python test server. |
| TEST_SERVER_STARTUP_TIMEOUT = 10 |
| |
| def _WaitUntil(predicate, max_attempts=5): |
| """Blocks until the provided predicate (function) is true. |
| |
| Returns: |
| Whether the provided predicate was satisfied once (before the timeout). |
| """ |
| sleep_time_sec = 0.025 |
| for _ in xrange(1, max_attempts): |
| if predicate(): |
| return True |
| time.sleep(sleep_time_sec) |
| sleep_time_sec = min(1, sleep_time_sec * 2) # Don't wait more than 1 sec. |
| return False |
| |
| |
| def _CheckPortStatus(port, expected_status): |
| """Returns True if port has expected_status. |
| |
| Args: |
| port: the port number. |
| expected_status: boolean of expected status. |
| |
| Returns: |
| Returns True if the status is expected. Otherwise returns False. |
| """ |
| return _WaitUntil(lambda: ports.IsHostPortUsed(port) == expected_status) |
| |
| |
| def _CheckDevicePortStatus(device, port): |
| """Returns whether the provided port is used.""" |
| return _WaitUntil(lambda: ports.IsDevicePortUsed(device, port)) |
| |
| |
| def _GetServerTypeCommandLine(server_type): |
| """Returns the command-line by the given server type. |
| |
| Args: |
| server_type: the server type to be used (e.g. 'http'). |
| |
| Returns: |
| A string containing the command-line argument. |
| """ |
| if server_type not in SERVER_TYPES: |
| raise NotImplementedError('Unknown server type: %s' % server_type) |
| if server_type == 'udpecho': |
| raise Exception('Please do not run UDP echo tests because we do not have ' |
| 'a UDP forwarder tool.') |
| return SERVER_TYPES[server_type] |
| |
| |
| class TestServerThread(threading.Thread): |
| """A thread to run the test server in a separate process.""" |
| |
| def __init__(self, ready_event, arguments, device, tool): |
| """Initialize TestServerThread with the following argument. |
| |
| Args: |
| ready_event: event which will be set when the test server is ready. |
| arguments: dictionary of arguments to run the test server. |
| device: An instance of DeviceUtils. |
| tool: instance of runtime error detection tool. |
| """ |
| threading.Thread.__init__(self) |
| self.wait_event = threading.Event() |
| self.stop_flag = False |
| self.ready_event = ready_event |
| self.ready_event.clear() |
| self.arguments = arguments |
| self.device = device |
| self.tool = tool |
| self.test_server_process = None |
| self.is_ready = False |
| self.host_port = self.arguments['port'] |
| assert isinstance(self.host_port, int) |
| # The forwarder device port now is dynamically allocated. |
| self.forwarder_device_port = 0 |
| # Anonymous pipe in order to get port info from test server. |
| self.pipe_in = None |
| self.pipe_out = None |
| self.process = None |
| self.command_line = [] |
| |
| def _WaitToStartAndGetPortFromTestServer(self): |
| """Waits for the Python test server to start and gets the port it is using. |
| |
| The port information is passed by the Python test server with a pipe given |
| by self.pipe_out. It is written as a result to |self.host_port|. |
| |
| Returns: |
| Whether the port used by the test server was successfully fetched. |
| """ |
| assert self.host_port == 0 and self.pipe_out and self.pipe_in |
| (in_fds, _, _) = select.select([self.pipe_in, ], [], [], |
| TEST_SERVER_STARTUP_TIMEOUT) |
| if len(in_fds) == 0: |
| logging.error('Failed to wait to the Python test server to be started.') |
| return False |
| # First read the data length as an unsigned 4-byte value. This |
| # is _not_ using network byte ordering since the Python test server packs |
| # size as native byte order and all Chromium platforms so far are |
| # configured to use little-endian. |
| # TODO(jnd): Change the Python test server and local_test_server_*.cc to |
| # use a unified byte order (either big-endian or little-endian). |
| data_length = os.read(self.pipe_in, struct.calcsize('=L')) |
| if data_length: |
| (data_length,) = struct.unpack('=L', data_length) |
| assert data_length |
| if not data_length: |
| logging.error('Failed to get length of server data.') |
| return False |
| port_json = os.read(self.pipe_in, data_length) |
| if not port_json: |
| logging.error('Failed to get server data.') |
| return False |
| logging.info('Got port json data: %s', port_json) |
| port_json = json.loads(port_json) |
| if port_json.has_key('port') and isinstance(port_json['port'], int): |
| self.host_port = port_json['port'] |
| return _CheckPortStatus(self.host_port, True) |
| logging.error('Failed to get port information from the server data.') |
| return False |
| |
| def _GenerateCommandLineArguments(self): |
| """Generates the command line to run the test server. |
| |
| Note that all options are processed by following the definitions in |
| testserver.py. |
| """ |
| if self.command_line: |
| return |
| |
| args_copy = dict(self.arguments) |
| |
| # Translate the server type. |
| type_cmd = _GetServerTypeCommandLine(args_copy.pop('server-type')) |
| if type_cmd: |
| self.command_line.append(type_cmd) |
| |
| # Use a pipe to get the port given by the instance of Python test server |
| # if the test does not specify the port. |
| assert self.host_port == args_copy['port'] |
| if self.host_port == 0: |
| (self.pipe_in, self.pipe_out) = os.pipe() |
| self.command_line.append('--startup-pipe=%d' % self.pipe_out) |
| |
| # Pass the remaining arguments as-is. |
| for key, values in args_copy.iteritems(): |
| if not isinstance(values, list): |
| values = [values] |
| for value in values: |
| if value is None: |
| self.command_line.append('--%s' % key) |
| else: |
| self.command_line.append('--%s=%s' % (key, value)) |
| |
| def _CloseUnnecessaryFDsForTestServerProcess(self): |
| # This is required to avoid subtle deadlocks that could be caused by the |
| # test server child process inheriting undesirable file descriptors such as |
| # file lock file descriptors. |
| for fd in xrange(0, 1024): |
| if fd != self.pipe_out: |
| try: |
| os.close(fd) |
| except: |
| pass |
| |
| def run(self): |
| logging.info('Start running the thread!') |
| self.wait_event.clear() |
| self._GenerateCommandLineArguments() |
| command = constants.DIR_SOURCE_ROOT |
| if self.arguments['server-type'] == 'sync': |
| command = [os.path.join(command, 'sync', 'tools', 'testserver', |
| 'sync_testserver.py')] + self.command_line |
| else: |
| command = [os.path.join(command, 'net', 'tools', 'testserver', |
| 'testserver.py')] + self.command_line |
| logging.info('Running: %s', command) |
| # Pass DIR_SOURCE_ROOT as the child's working directory so that relative |
| # paths in the arguments are resolved correctly. |
| self.process = subprocess.Popen( |
| command, preexec_fn=self._CloseUnnecessaryFDsForTestServerProcess, |
| cwd=constants.DIR_SOURCE_ROOT) |
| if self.process: |
| if self.pipe_out: |
| self.is_ready = self._WaitToStartAndGetPortFromTestServer() |
| else: |
| self.is_ready = _CheckPortStatus(self.host_port, True) |
| if self.is_ready: |
| Forwarder.Map([(0, self.host_port)], self.device, self.tool) |
| # Check whether the forwarder is ready on the device. |
| self.is_ready = False |
| device_port = Forwarder.DevicePortForHostPort(self.host_port) |
| if device_port and _CheckDevicePortStatus(self.device, device_port): |
| self.is_ready = True |
| self.forwarder_device_port = device_port |
| # Wake up the request handler thread. |
| self.ready_event.set() |
| # Keep thread running until Stop() gets called. |
| _WaitUntil(lambda: self.stop_flag, max_attempts=sys.maxint) |
| if self.process.poll() is None: |
| self.process.kill() |
| Forwarder.UnmapDevicePort(self.forwarder_device_port, self.device) |
| self.process = None |
| self.is_ready = False |
| if self.pipe_out: |
| os.close(self.pipe_in) |
| os.close(self.pipe_out) |
| self.pipe_in = None |
| self.pipe_out = None |
| logging.info('Test-server has died.') |
| self.wait_event.set() |
| |
| def Stop(self): |
| """Blocks until the loop has finished. |
| |
| Note that this must be called in another thread. |
| """ |
| if not self.process: |
| return |
| self.stop_flag = True |
| self.wait_event.wait() |
| |
| |
| class SpawningServerRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler): |
| """A handler used to process http GET/POST request.""" |
| |
| def _SendResponse(self, response_code, response_reason, additional_headers, |
| contents): |
| """Generates a response sent to the client from the provided parameters. |
| |
| Args: |
| response_code: number of the response status. |
| response_reason: string of reason description of the response. |
| additional_headers: dict of additional headers. Each key is the name of |
| the header, each value is the content of the header. |
| contents: string of the contents we want to send to client. |
| """ |
| self.send_response(response_code, response_reason) |
| self.send_header('Content-Type', 'text/html') |
| # Specify the content-length as without it the http(s) response will not |
| # be completed properly (and the browser keeps expecting data). |
| self.send_header('Content-Length', len(contents)) |
| for header_name in additional_headers: |
| self.send_header(header_name, additional_headers[header_name]) |
| self.end_headers() |
| self.wfile.write(contents) |
| self.wfile.flush() |
| |
| def _StartTestServer(self): |
| """Starts the test server thread.""" |
| logging.info('Handling request to spawn a test server.') |
| content_type = self.headers.getheader('content-type') |
| if content_type != 'application/json': |
| raise Exception('Bad content-type for start request.') |
| content_length = self.headers.getheader('content-length') |
| if not content_length: |
| content_length = 0 |
| try: |
| content_length = int(content_length) |
| except: |
| raise Exception('Bad content-length for start request.') |
| logging.info(content_length) |
| test_server_argument_json = self.rfile.read(content_length) |
| logging.info(test_server_argument_json) |
| assert not self.server.test_server_instance |
| ready_event = threading.Event() |
| self.server.test_server_instance = TestServerThread( |
| ready_event, |
| json.loads(test_server_argument_json), |
| self.server.device, |
| self.server.tool) |
| self.server.test_server_instance.setDaemon(True) |
| self.server.test_server_instance.start() |
| ready_event.wait() |
| if self.server.test_server_instance.is_ready: |
| self._SendResponse(200, 'OK', {}, json.dumps( |
| {'port': self.server.test_server_instance.forwarder_device_port, |
| 'message': 'started'})) |
| logging.info('Test server is running on port: %d.', |
| self.server.test_server_instance.host_port) |
| else: |
| self.server.test_server_instance.Stop() |
| self.server.test_server_instance = None |
| self._SendResponse(500, 'Test Server Error.', {}, '') |
| logging.info('Encounter problem during starting a test server.') |
| |
| def _KillTestServer(self): |
| """Stops the test server instance.""" |
| # There should only ever be one test server at a time. This may do the |
| # wrong thing if we try and start multiple test servers. |
| if not self.server.test_server_instance: |
| return |
| port = self.server.test_server_instance.host_port |
| logging.info('Handling request to kill a test server on port: %d.', port) |
| self.server.test_server_instance.Stop() |
| # Make sure the status of test server is correct before sending response. |
| if _CheckPortStatus(port, False): |
| self._SendResponse(200, 'OK', {}, 'killed') |
| logging.info('Test server on port %d is killed', port) |
| else: |
| self._SendResponse(500, 'Test Server Error.', {}, '') |
| logging.info('Encounter problem during killing a test server.') |
| self.server.test_server_instance = None |
| |
| def do_POST(self): |
| parsed_path = urlparse.urlparse(self.path) |
| action = parsed_path.path |
| logging.info('Action for POST method is: %s.', action) |
| if action == '/start': |
| self._StartTestServer() |
| else: |
| self._SendResponse(400, 'Unknown request.', {}, '') |
| logging.info('Encounter unknown request: %s.', action) |
| |
| def do_GET(self): |
| parsed_path = urlparse.urlparse(self.path) |
| action = parsed_path.path |
| params = urlparse.parse_qs(parsed_path.query, keep_blank_values=1) |
| logging.info('Action for GET method is: %s.', action) |
| for param in params: |
| logging.info('%s=%s', param, params[param][0]) |
| if action == '/kill': |
| self._KillTestServer() |
| elif action == '/ping': |
| # The ping handler is used to check whether the spawner server is ready |
| # to serve the requests. We don't need to test the status of the test |
| # server when handling ping request. |
| self._SendResponse(200, 'OK', {}, 'ready') |
| logging.info('Handled ping request and sent response.') |
| else: |
| self._SendResponse(400, 'Unknown request', {}, '') |
| logging.info('Encounter unknown request: %s.', action) |
| |
| |
| class SpawningServer(object): |
| """The class used to start/stop a http server.""" |
| |
| def __init__(self, test_server_spawner_port, device, tool): |
| logging.info('Creating new spawner on port: %d.', test_server_spawner_port) |
| self.server = BaseHTTPServer.HTTPServer(('', test_server_spawner_port), |
| SpawningServerRequestHandler) |
| self.server.device = device |
| self.server.tool = tool |
| self.server.test_server_instance = None |
| self.server.build_type = constants.GetBuildType() |
| |
| def _Listen(self): |
| logging.info('Starting test server spawner') |
| self.server.serve_forever() |
| |
| def Start(self): |
| """Starts the test server spawner.""" |
| listener_thread = threading.Thread(target=self._Listen) |
| listener_thread.setDaemon(True) |
| listener_thread.start() |
| |
| def Stop(self): |
| """Stops the test server spawner. |
| |
| Also cleans the server state. |
| """ |
| self.CleanupState() |
| self.server.shutdown() |
| |
| def CleanupState(self): |
| """Cleans up the spawning server state. |
| |
| This should be called if the test server spawner is reused, |
| to avoid sharing the test server instance. |
| """ |
| if self.server.test_server_instance: |
| self.server.test_server_instance.Stop() |
| self.server.test_server_instance = None |
