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| 1 #!/usr/bin/env python | |
| 2 # Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 3 # Use of this source code is governed by a BSD-style license that can be | |
| 4 # found in the LICENSE file. | |
| 5 | |
| 6 import cStringIO | |
| 7 import os | |
| 8 import pickle | |
| 9 import socket | |
| 10 import sys | |
| 11 | |
| 12 import pyauto | |
| 13 | |
| 14 class RemoteHost(object): | |
| 15 """Class used as a host for tests that use the PyAuto RemoteProxy. | |
| 16 | |
| 17 This class fires up a listener which waits for a connection from a RemoteProxy | |
| 18 and receives method call requests. Run python remote_host.py | |
| 19 remote_host.RemoteHost.RunHost to start up a PyAuto remote instance that you | |
| 20 can connect to and automate using pyauto.RemoteProxy. | |
| 21 """ | |
| 22 def __init__(self, host, *args, **kwargs): | |
| 23 self.StartSocketServer(host) | |
| 24 | |
| 25 def StartSocketServer(self, host): | |
| 26 listening_socket = socket.socket() | |
| 27 listening_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | |
| 28 listening_socket.bind(host) | |
| 29 listening_socket.listen(1) | |
| 30 print 'Listening for incoming connections on port %d.' % host[1] | |
| 31 self._socket, address = listening_socket.accept() | |
| 32 print 'Accepted connection from %s:%d.' % address | |
| 33 | |
| 34 while self.Connected(): | |
| 35 self._HandleRPC() | |
| 36 | |
| 37 def StopSocketServer(self): | |
| 38 if self._socket: | |
| 39 try: | |
| 40 self._socket.shutdown(socket.SHUT_RDWR) | |
| 41 self._socket.close() | |
| 42 except socket.error: | |
| 43 pass | |
| 44 self._socket = None | |
| 45 | |
| 46 def Connected(self): | |
| 47 return self._socket | |
| 48 | |
| 49 def CreateTarget(self, target_class): | |
| 50 """Creates an instance of the specified class to serve as the RPC target. | |
| 51 | |
| 52 RPC calls can be made on the target. | |
| 53 """ | |
| 54 self.target = target_class() | |
| 55 | |
| 56 def _HandleRPC(self): | |
| 57 """Receives a method call request over the socket and executes the method. | |
| 58 | |
| 59 This method captures stdout and stderr for the duration of the method call, | |
| 60 and sends those, the return value, and any thrown exceptions back to the | |
| 61 RemoteProxy. | |
| 62 """ | |
| 63 # Receive request. | |
| 64 request = self._socket.recv(4096) | |
| 65 if not request: | |
| 66 self.StopSocketServer() | |
| 67 return | |
| 68 request = pickle.loads(request) | |
| 69 | |
| 70 # Redirect output to strings. | |
| 71 old_stdout = sys.stdout | |
| 72 old_stderr = sys.stderr | |
| 73 sys.stdout = stdout = cStringIO.StringIO() | |
| 74 sys.stderr = stderr = cStringIO.StringIO() | |
| 75 | |
| 76 # Make requested method call. | |
| 77 result = None | |
| 78 exception = None | |
| 79 try: | |
| 80 if getattr(self, request[0], None): | |
| 81 result = getattr(self, request[0])(*request[1], **request[2]) | |
| 82 else: | |
| 83 result = getattr(self.target, request[0])(*request[1], **request[2]) | |
| 84 except BaseException, e: | |
| 85 exception = (e.__class__.__name__, str(e)) | |
| 86 | |
| 87 # Put output back to the way it was before. | |
| 88 sys.stdout = old_stdout | |
| 89 sys.stderr = old_stderr | |
| 90 | |
| 91 # Package up and send the result of the method call. | |
| 92 response = pickle.dumps((result, stdout.getvalue(), stderr.getvalue(), | |
| 93 exception)) | |
| 94 if self._socket.send(response) != len(response): | |
| 95 self.StopSocketServer() | |
| 96 | |
| 97 | |
| 98 if __name__ == '__main__': | |
| 99 pyauto_suite = pyauto.PyUITestSuite(sys.argv) | |
| 100 RemoteHost(('', 7410)) | |
| 101 del pyauto_suite | |
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