Adding the initial code for Omnibot multi-machine support

testing/legion/client_lib.py

Index: testing/legion/client_lib.py
diff --git a/testing/legion/client_lib.py b/testing/legion/client_lib.py
new file mode 100644
index 0000000000000000000000000000000000000000..da43ed2c36f08b3ac754e291ea00500e1572150a
--- /dev/null
+++ b/testing/legion/client_lib.py
@@ -0,0 +1,208 @@
+# Copyright 2015 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.
+
+"""Defines the client library."""
+
+import argparse
+import logging
+import os
+import socket
+import subprocess
+import tempfile
+import threading
+import uuid
+import xmlrpclib
+import StringIO
+
+#pylint: disable=relative-import
+import common_lib
+
+THIS_DIR = os.path.dirname(os.path.abspath(__file__))
+SWARMING_DIR = os.path.join(THIS_DIR, '..', '..', 'tools/swarming_client')
+ISOLATE_PY = os.path.join(SWARMING_DIR, 'isolate.py')
+SWARMING_PY = os.path.join(SWARMING_DIR, 'swarming.py')
+
+
+class Error(Exception):
+  pass
+
+
+class ConnectionTimeoutError(Error):
+  pass
+
+
+class ClientController(object):
+  """Creates, configures, and controls a client machine."""
+
+  _client_count = 0
+  _controllers = []
+
+  def __init__(self, isolate_file, config_vars, dimensions, priority=100,
+               idle_timeout_secs=common_lib.DEFAULT_TIMEOUT_SECS,
+               connection_timeout_secs=common_lib.DEFAULT_TIMEOUT_SECS,
+               verbosity='ERROR', name=None):
+    assert isinstance(config_vars, dict)
+    assert isinstance(dimensions, dict)
+    type(self)._controllers.append(self)
+    type(self)._client_count += 1
+    self.verbosity = verbosity
+    self._name = name or 'Client%d' % type(self)._client_count
+    self._priority = priority
+    self._isolate_file = isolate_file
+    self._isolated_file = isolate_file + 'd'
+    self._idle_timeout_secs = idle_timeout_secs
+    self._config_vars = config_vars
+    self._dimensions = dimensions
+    self._connect_event = threading.Event()
+    self._connected = False
+    self._ip_address = None
+    self._otp = str(uuid.uuid1())
+    self._rpc = None
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--isolate-server')
+    parser.add_argument('--swarming-server')
+    parser.add_argument('--client-connection-timeout-secs',
+                        default=common_lib.DEFAULT_TIMEOUT_SECS)
+    args, _ = parser.parse_known_args()
+
+    self._isolate_server = args.isolate_server
+    self._swarming_server = args.swarming_server
+    self._connection_timeout_secs = (connection_timeout_secs or
+                                    args.client_connection_timeout_secs)
+
+  @property
+  def name(self):
+    return self._name
+
+  @property
+  def otp(self):
+    return self._otp
+
+  @property
+  def connected(self):
+    return self._connected
+
+  @property
+  def connect_event(self):
+    return self._connect_event
+
+  @property
+  def rpc(self):
+    return self._rpc
+
+  @property
+  def verbosity(self):
+    return self._verbosity
+
+  @verbosity.setter
+  def verbosity(self, level):
+    """Sets the verbosity level as a string.
+
+    Either a string ('INFO', 'DEBUG', etc) or a logging level (logging.INFO,
+    logging.DEBUG, etc) is allowed.
+    """
+    assert isinstance(level, (str, int))
+    if isinstance(level, int):
+      level = logging.getLevelName(level)
+    self._verbosity = level  #pylint: disable=attribute-defined-outside-init
+
+  @classmethod
+  def ReleaseAllControllers(cls):
+    for controller in cls._controllers:
+      controller.Release()
+
+  def Create(self):
+    """Creates the client machine."""
+    logging.info('Creating %s', self.name)
+    self._connect_event.clear()
+    self._ExecuteIsolate()
+    self._ExecuteSwarming()
+
+  def WaitForConnection(self):
+    """Waits for the client machine to connect.
+
+    Raises:
+      ConnectionTimeoutError if the client doesn't connect in time.
+    """
+    logging.info('Waiting for %s to connect with a timeout of %d seconds',
+                 self._name, self._connection_timeout_secs)
+    self._connect_event.wait(self._connection_timeout_secs)
+    if not self._connect_event.is_set():
+      raise ConnectionTimeoutError('%s failed to connect' % self.name)
+
+  def Release(self):
+    """Quits the client's RPC server so it can release the machine."""
+    if self._rpc is not None and self._connected:
+      logging.info('Releasing %s', self._name)
+      try:
+        self._rpc.Quit()
+      except (socket.error, xmlrpclib.Fault):
+        logging.error('Unable to connect to %s to call Quit', self.name)
+      self._rpc = None
+      self._connected = False
+
+  def _ExecuteIsolate(self):
+    """Executes isolate.py."""
+    cmd = [
+        'python',
+        ISOLATE_PY,
+        'archive',
+        '--isolate', self._isolate_file,
+        '--isolated', self._isolated_file,
+        ]
+
+    if self._isolate_server:
+      cmd.extend(['--isolate-server', self._isolate_server])
+    for key, value in self._config_vars.iteritems():
+      cmd.extend(['--config-var', key, value])
+
+    self._ExecuteProcess(cmd)
+
+  def _ExecuteSwarming(self):
+    """Executes swarming.py."""
+    cmd = [
+        'python',
+        SWARMING_PY,
+        'trigger',
+        self._isolated_file,
+        '--priority', str(self._priority)

[M-A Ruel, 2015/02/03 01:48:40]

I generally prefer to keep comma even on trailing item.
This way if another item is added in a follow up, the previous line doesn't have
to be touched.

[Mike Meade, 2015/02/03 17:47:57]

Done.

+        ]
+
+    if self._isolate_server:
+      cmd.extend(['--isolate-server', self._isolate_server])
+    if self._swarming_server:
+      cmd.extend(['--swarming', self._swarming_server])
+    for key, value in self._dimensions.iteritems():
+      cmd.extend(['--dimension', key, value])
+
+    cmd.extend([
+        '--',
+        '--host', common_lib.MY_IP,
+        '--otp', self._otp,
+        '--verbosity', self._verbosity,
+        '--idle-timeout', str(self._idle_timeout_secs)

[M-A Ruel, 2015/02/03 01:48:40]

same

[Mike Meade, 2015/02/03 17:47:57]

Done.

+        ])
+
+    self._ExecuteProcess(cmd)
+
+  def _ExecuteProcess(self, cmd):
+    """Executes a process, waits for it to complete, and checks for success."""
+    logging.debug('Running %s', ' '.join(cmd))
+    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    stderr = StringIO.StringIO()
+    while p.poll() is None:
+      _, _stderr = p.communicate()
+      stderr.write(_stderr)
+    if p.returncode != 0:
+      stderr.seek(0)
+      raise Error(stderr.read())
+
+  def OnConnect(self, ip_address):
+    """Receives client ip address on connection."""
+    self._ip_address = ip_address
+    self._connected = True
+    self._rpc = common_lib.ConnectToServer(self._ip_address)
+    logging.info('%s connected from %s', self._name, ip_address)
+    self._connect_event.set()