1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
#!/usr/bin/env python
# Copyright (C) 2011 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Base class with common routines between the Apache, Lighttpd, and websocket servers."""
import errno
import logging
import socket
import sys
import tempfile
import time
_log = logging.getLogger(__name__)
class ServerError(Exception):
pass
class HttpServerBase(object):
"""A skeleton class for starting and stopping servers used by the layout tests."""
def __init__(self, port_obj):
self._executive = port_obj._executive
self._filesystem = port_obj._filesystem
self._name = '<virtual>'
self._mappings = {}
self._pid = None
self._pid_file = None
self._port_obj = port_obj
# We need a non-checkout-dependent place to put lock files, etc. We
# don't use the Python default on the Mac because it defaults to a
# randomly-generated directory under /var/folders and no one would ever
# look there.
tmpdir = tempfile.gettempdir()
if port_obj.host.platform.is_mac():
tmpdir = '/tmp'
self._runtime_path = self._filesystem.join(tmpdir, "WebKit")
self._filesystem.maybe_make_directory(self._runtime_path)
def start(self):
"""Starts the server. It is an error to start an already started server.
This method also stops any stale servers started by a previous instance."""
assert not self._pid, '%s server is already running' % self._name
# Stop any stale servers left over from previous instances.
if self._filesystem.exists(self._pid_file):
self._pid = int(self._filesystem.read_text_file(self._pid_file))
self._stop_running_server()
self._pid = None
self._remove_stale_logs()
self._prepare_config()
self._check_that_all_ports_are_available()
self._pid = self._spawn_process()
if self._wait_for_action(self._is_server_running_on_all_ports):
_log.debug("%s successfully started (pid = %d)" % (self._name, self._pid))
else:
self._stop_running_server()
raise ServerError('Failed to start %s server' % self._name)
def stop(self):
"""Stops the server. Stopping a server that isn't started is harmless."""
actual_pid = None
if self._filesystem.exists(self._pid_file):
actual_pid = int(self._filesystem.read_text_file(self._pid_file))
if not self._pid:
self._pid = actual_pid
if not self._pid:
return
if not actual_pid:
_log.warning('Failed to stop %s: pid file is missing' % self._name)
return
if self._pid != actual_pid:
_log.warning('Failed to stop %s: pid file contains %d, not %d' %
(self._name, actual_pid, self._pid))
# Try to kill the existing pid, anyway, in case it got orphaned.
self._executive.kill_process(self._pid)
self._pid = None
return
_log.debug("Attempting to shut down %s server at pid %d" % (self._name, self._pid))
self._stop_running_server()
_log.debug("%s server at pid %d stopped" % (self._name, self._pid))
self._pid = None
def _prepare_config(self):
"""This routine can be overridden by subclasses to do any sort
of initialization required prior to starting the server that may fail."""
pass
def _remove_stale_logs(self):
"""This routine can be overridden by subclasses to try and remove logs
left over from a prior run. This routine should log warnings if the
files cannot be deleted, but should not fail unless failure to
delete the logs will actually cause start() to fail."""
pass
def _spawn_process(self):
"""This routine must be implemented by subclasses to actually start the server.
This routine returns the pid of the started process, and also ensures that that
pid has been written to self._pid_file."""
raise NotImplementedError()
def _stop_running_server(self):
"""This routine must be implemented by subclasses to actually stop the running server listed in self._pid_file."""
raise NotImplementedError()
# Utility routines.
def _remove_log_files(self, folder, starts_with):
files = self._filesystem.listdir(folder)
for file in files:
if file.startswith(starts_with):
full_path = self._filesystem.join(folder, file)
self._filesystem.remove(full_path)
def _wait_for_action(self, action, wait_secs=20.0, sleep_secs=1.0):
"""Repeat the action for wait_sec or until it succeeds, sleeping for sleep_secs
in between each attempt. Returns whether it succeeded."""
start_time = time.time()
while time.time() - start_time < wait_secs:
if action():
return True
_log.debug("Waiting for action: %s" % action)
time.sleep(sleep_secs)
return False
def _is_server_running_on_all_ports(self):
"""Returns whether the server is running on all the desired ports."""
if not self._executive.check_running_pid(self._pid):
_log.debug("Server isn't running at all")
raise ServerError("Server exited")
for mapping in self._mappings:
s = socket.socket()
port = mapping['port']
try:
s.connect(('localhost', port))
_log.debug("Server running on %d" % port)
except IOError, e:
if e.errno not in (errno.ECONNREFUSED, errno.ECONNRESET):
raise
_log.debug("Server NOT running on %d: %s" % (port, e))
return False
finally:
s.close()
return True
def _check_that_all_ports_are_available(self):
for mapping in self._mappings:
s = socket.socket()
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
port = mapping['port']
try:
s.bind(('localhost', port))
except IOError, e:
if e.errno in (errno.EALREADY, errno.EADDRINUSE):
raise ServerError('Port %d is already in use.' % port)
elif sys.platform == 'win32' and e.errno in (errno.WSAEACCES,):
raise ServerError('Port %d is already in use.' % port)
else:
raise
finally:
s.close()
|
