4 # Copyright (C) 2007, 2008 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 """HTTP client module.
25 # pylint: disable-msg=E1103
27 # # E1103: %s %r has no %r member (but some types could not be
28 # inferred), since _socketobject could be ssl or not and pylint
38 from ganeti import workerpool
39 from ganeti import http
42 HTTP_CLIENT_THREADS = 10
45 class HttpClientRequest(object):
46 def __init__(self, host, port, method, path, headers=None, post_data=None,
47 ssl_params=None, ssl_verify_peer=False):
48 """Describes an HTTP request.
55 @param method: Method name
57 @param path: Request path
58 @type headers: dict or None
59 @param headers: Additional headers to send
60 @type post_data: string or None
61 @param post_data: Additional data to send
62 @type ssl_params: HttpSslParams
63 @param ssl_params: SSL key and certificate
64 @type ssl_verify_peer: bool
65 @param ssl_verify_peer: Whether to compare our certificate with
69 if post_data is not None:
70 assert method.upper() in (http.HTTP_POST, http.HTTP_PUT), \
71 "Only POST and GET requests support sending data"
73 assert path.startswith("/"), "Path must start with slash (/)"
78 self.ssl_params = ssl_params
79 self.ssl_verify_peer = ssl_verify_peer
82 self.headers = headers
83 self.post_data = post_data
92 self.resp_version = None
93 self.resp_status_code = None
94 self.resp_reason = None
95 self.resp_headers = None
99 class _HttpClientToServerMessageWriter(http.HttpMessageWriter):
103 class _HttpServerToClientMessageReader(http.HttpMessageReader):
105 START_LINE_LENGTH_MAX = 512
106 HEADER_LENGTH_MAX = 4096
108 def ParseStartLine(self, start_line):
109 """Parses the status line sent by the server.
112 # Empty lines are skipped when reading
116 [version, status, reason] = start_line.split(None, 2)
119 [version, status] = start_line.split(None, 1)
122 version = http.HTTP_0_9
125 version = version.upper()
127 # The status code is a three-digit number
130 if status < 100 or status > 999:
136 raise http.HttpError("Invalid status code (%r)" % start_line)
138 return http.HttpServerToClientStartLine(version, status, reason)
141 class HttpClientRequestExecutor(http.HttpBase):
144 http.HTTP_USER_AGENT: http.HTTP_GANETI_VERSION,
145 # TODO: For keep-alive, don't send "Connection: close"
146 http.HTTP_CONNECTION: "close",
149 # Timeouts in seconds for socket layer
150 # TODO: Soft timeout instead of only socket timeout?
151 # TODO: Make read timeout configurable per OpCode?
157 def __init__(self, req):
158 """Initializes the HttpClientRequestExecutor class.
160 @type req: HttpClientRequest
161 @param req: Request object
164 http.HttpBase.__init__(self)
168 # TODO: Implement connection caching/keep-alive
169 self.sock = self._CreateSocket(req.ssl_params,
172 # Disable Python's timeout
173 self.sock.settimeout(None)
175 # Operate in non-blocking mode
176 self.sock.setblocking(0)
178 response_msg_reader = None
185 (response_msg_reader, response_msg) = self._ReadResponse()
187 # Only wait for server to close if we didn't have any exception.
190 # TODO: Keep-alive is not supported, always close connection
192 http.ShutdownConnection(self.sock, self.CLOSE_TIMEOUT,
193 self.WRITE_TIMEOUT, response_msg_reader,
199 req.response = response_msg
201 req.resp_version = req.response.start_line.version
202 req.resp_status_code = req.response.start_line.code
203 req.resp_reason = req.response.start_line.reason
204 req.resp_headers = req.response.headers
205 req.resp_body = req.response.body
210 except http.HttpError, err:
215 """Non-blocking connect to host with timeout.
221 connect_error = self.sock.connect_ex((self.request.host,
223 except socket.gaierror, err:
224 raise http.HttpError("Connection failed: %s" % str(err))
226 if connect_error == errno.EINTR:
230 elif connect_error == 0:
231 # Connection established
235 elif connect_error == errno.EINPROGRESS:
239 raise http.HttpError("Connection failed (%s: %s)" %
240 (connect_error, os.strerror(connect_error)))
243 # Wait for connection
244 event = http.WaitForSocketCondition(self.sock, select.POLLOUT,
245 self.CONNECT_TIMEOUT)
247 raise http.HttpError("Timeout while connecting to server")
250 connect_error = self.sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
251 if connect_error != 0:
252 raise http.HttpError("Connection failed (%s: %s)" %
253 (connect_error, os.strerror(connect_error)))
255 # Enable TCP keep-alive
256 self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
258 # If needed, Linux specific options are available to change the TCP
259 # keep-alive settings, see "man 7 tcp" for TCP_KEEPCNT, TCP_KEEPIDLE and
262 # Do the secret SSL handshake
264 self.sock.set_connect_state()
266 http.Handshake(self.sock, self.WRITE_TIMEOUT)
267 except http.HttpSessionHandshakeUnexpectedEOF:
268 raise http.HttpError("Server closed connection during SSL handshake")
270 def _SendRequest(self):
271 """Sends request to server.
275 send_headers = self.DEFAULT_HEADERS.copy()
277 if self.request.headers:
278 send_headers.update(self.request.headers)
280 send_headers[http.HTTP_HOST] = "%s:%s" % (self.request.host,
284 msg = http.HttpMessage()
286 # Combine request line. We only support HTTP/1.0 (no chunked transfers and
288 # TODO: For keep-alive, change to HTTP/1.1
290 http.HttpClientToServerStartLine(method=self.request.method.upper(),
291 path=self.request.path,
292 version=http.HTTP_1_0)
293 msg.headers = send_headers
294 msg.body = self.request.post_data
297 _HttpClientToServerMessageWriter(self.sock, msg, self.WRITE_TIMEOUT)
298 except http.HttpSocketTimeout:
299 raise http.HttpError("Timeout while sending request")
300 except socket.error, err:
301 raise http.HttpError("Error sending request: %s" % err)
303 def _ReadResponse(self):
304 """Read response from server.
307 response_msg = http.HttpMessage()
310 response_msg_reader = \
311 _HttpServerToClientMessageReader(self.sock, response_msg,
313 except http.HttpSocketTimeout:
314 raise http.HttpError("Timeout while reading response")
315 except socket.error, err:
316 raise http.HttpError("Error reading response: %s" % err)
318 return (response_msg_reader, response_msg)
321 class _HttpClientPendingRequest(object):
322 """Data class for pending requests.
325 def __init__(self, request):
326 self.request = request
328 # Thread synchronization
329 self.done = threading.Event()
332 class HttpClientWorker(workerpool.BaseWorker):
333 """HTTP client worker class.
336 def RunTask(self, pend_req):
338 HttpClientRequestExecutor(pend_req.request)
343 class HttpClientWorkerPool(workerpool.WorkerPool):
344 def __init__(self, manager):
345 workerpool.WorkerPool.__init__(self, HTTP_CLIENT_THREADS,
347 self.manager = manager
350 class HttpClientManager(object):
351 """Manages HTTP requests.
355 self._wpool = HttpClientWorkerPool(self)
360 def ExecRequests(self, requests):
361 """Execute HTTP requests.
363 This function can be called from multiple threads at the same time.
365 @type requests: List of HttpClientRequest instances
366 @param requests: The requests to execute
367 @rtype: List of HttpClientRequest instances
368 @return: The list of requests passed in
371 # _HttpClientPendingRequest is used for internal thread synchronization
372 pending = [_HttpClientPendingRequest(req) for req in requests]
375 # Add requests to queue
376 for pend_req in pending:
377 self._wpool.AddTask(pend_req)
380 # In case of an exception we should still wait for the rest, otherwise
381 # another thread from the worker pool could modify the request object
384 # And wait for them to finish
385 for pend_req in pending:
388 # Return original list
392 self._wpool.Quiesce()
393 self._wpool.TerminateWorkers()