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.
31 from ganeti import workerpool
32 from ganeti import http
35 HTTP_CLIENT_THREADS = 10
38 class HttpClientRequest(object):
39 def __init__(self, host, port, method, path, headers=None, post_data=None,
40 ssl_params=None, ssl_verify_peer=False):
41 """Describes an HTTP request.
48 @param method: Method name
50 @param path: Request path
51 @type headers: dict or None
52 @param headers: Additional headers to send
53 @type post_data: string or None
54 @param post_data: Additional data to send
55 @type ssl_params: HttpSslParams
56 @param ssl_params: SSL key and certificate
57 @type ssl_verify_peer: bool
58 @param ssl_verify_peer: Whether to compare our certificate with
62 if post_data is not None:
63 assert method.upper() in (http.HTTP_POST, http.HTTP_PUT), \
64 "Only POST and GET requests support sending data"
66 assert path.startswith("/"), "Path must start with slash (/)"
71 self.ssl_params = ssl_params
72 self.ssl_verify_peer = ssl_verify_peer
75 self.headers = headers
76 self.post_data = post_data
85 self.resp_version = None
86 self.resp_status_code = None
87 self.resp_reason = None
88 self.resp_headers = None
92 class _HttpClientToServerMessageWriter(http.HttpMessageWriter):
96 class _HttpServerToClientMessageReader(http.HttpMessageReader):
98 START_LINE_LENGTH_MAX = 512
99 HEADER_LENGTH_MAX = 4096
101 def ParseStartLine(self, start_line):
102 """Parses the status line sent by the server.
105 # Empty lines are skipped when reading
109 [version, status, reason] = start_line.split(None, 2)
112 [version, status] = start_line.split(None, 1)
115 version = http.HTTP_0_9
118 version = version.upper()
120 # The status code is a three-digit number
123 if status < 100 or status > 999:
129 raise http.HttpError("Invalid status code (%r)" % start_line)
131 return http.HttpServerToClientStartLine(version, status, reason)
134 class HttpClientRequestExecutor(http.HttpBase):
137 http.HTTP_USER_AGENT: http.HTTP_GANETI_VERSION,
138 # TODO: For keep-alive, don't send "Connection: close"
139 http.HTTP_CONNECTION: "close",
142 # Timeouts in seconds for socket layer
143 # TODO: Soft timeout instead of only socket timeout?
144 # TODO: Make read timeout configurable per OpCode?
150 def __init__(self, req):
151 """Initializes the HttpClientRequestExecutor class.
153 @type req: HttpClientRequest
154 @param req: Request object
157 http.HttpBase.__init__(self)
161 # TODO: Implement connection caching/keep-alive
162 self.sock = self._CreateSocket(req.ssl_params,
165 # Disable Python's timeout
166 self.sock.settimeout(None)
168 # Operate in non-blocking mode
169 self.sock.setblocking(0)
171 response_msg_reader = None
178 (response_msg_reader, response_msg) = self._ReadResponse()
180 # Only wait for server to close if we didn't have any exception.
183 # TODO: Keep-alive is not supported, always close connection
185 http.ShutdownConnection(self.sock, self.CLOSE_TIMEOUT,
186 self.WRITE_TIMEOUT, response_msg_reader,
192 req.response = response_msg
194 req.resp_version = req.response.start_line.version
195 req.resp_status_code = req.response.start_line.code
196 req.resp_reason = req.response.start_line.reason
197 req.resp_headers = req.response.headers
198 req.resp_body = req.response.body
203 except http.HttpError, err:
208 """Non-blocking connect to host with timeout.
214 connect_error = self.sock.connect_ex((self.request.host,
216 except socket.gaierror, err:
217 raise http.HttpError("Connection failed: %s" % str(err))
219 if connect_error == errno.EINTR:
223 elif connect_error == 0:
224 # Connection established
228 elif connect_error == errno.EINPROGRESS:
232 raise http.HttpError("Connection failed (%s: %s)" %
233 (connect_error, os.strerror(connect_error)))
236 # Wait for connection
237 event = http.WaitForSocketCondition(self.sock, select.POLLOUT,
238 self.CONNECT_TIMEOUT)
240 raise http.HttpError("Timeout while connecting to server")
243 connect_error = self.sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
244 if connect_error != 0:
245 raise http.HttpError("Connection failed (%s: %s)" %
246 (connect_error, os.strerror(connect_error)))
248 # Enable TCP keep-alive
249 self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
251 # If needed, Linux specific options are available to change the TCP
252 # keep-alive settings, see "man 7 tcp" for TCP_KEEPCNT, TCP_KEEPIDLE and
255 # Do the secret SSL handshake
257 self.sock.set_connect_state()
259 http.Handshake(self.sock, self.WRITE_TIMEOUT)
260 except http.HttpSessionHandshakeUnexpectedEOF:
261 raise http.HttpError("Server closed connection during SSL handshake")
263 def _SendRequest(self):
264 """Sends request to server.
268 send_headers = self.DEFAULT_HEADERS.copy()
270 if self.request.headers:
271 send_headers.update(self.request.headers)
273 send_headers[http.HTTP_HOST] = "%s:%s" % (self.request.host,
277 msg = http.HttpMessage()
279 # Combine request line. We only support HTTP/1.0 (no chunked transfers and
281 # TODO: For keep-alive, change to HTTP/1.1
283 http.HttpClientToServerStartLine(method=self.request.method.upper(),
284 path=self.request.path,
285 version=http.HTTP_1_0)
286 msg.headers = send_headers
287 msg.body = self.request.post_data
290 _HttpClientToServerMessageWriter(self.sock, msg, self.WRITE_TIMEOUT)
291 except http.HttpSocketTimeout:
292 raise http.HttpError("Timeout while sending request")
293 except socket.error, err:
294 raise http.HttpError("Error sending request: %s" % err)
296 def _ReadResponse(self):
297 """Read response from server.
300 response_msg = http.HttpMessage()
303 response_msg_reader = \
304 _HttpServerToClientMessageReader(self.sock, response_msg,
306 except http.HttpSocketTimeout:
307 raise http.HttpError("Timeout while reading response")
308 except socket.error, err:
309 raise http.HttpError("Error reading response: %s" % err)
311 return (response_msg_reader, response_msg)
314 class _HttpClientPendingRequest(object):
315 """Data class for pending requests.
318 def __init__(self, request):
319 self.request = request
321 # Thread synchronization
322 self.done = threading.Event()
325 class HttpClientWorker(workerpool.BaseWorker):
326 """HTTP client worker class.
329 def RunTask(self, pend_req):
331 HttpClientRequestExecutor(pend_req.request)
336 class HttpClientWorkerPool(workerpool.WorkerPool):
337 def __init__(self, manager):
338 workerpool.WorkerPool.__init__(self, HTTP_CLIENT_THREADS,
340 self.manager = manager
343 class HttpClientManager(object):
344 """Manages HTTP requests.
348 self._wpool = HttpClientWorkerPool(self)
353 def ExecRequests(self, requests):
354 """Execute HTTP requests.
356 This function can be called from multiple threads at the same time.
358 @type requests: List of HttpClientRequest instances
359 @param requests: The requests to execute
360 @rtype: List of HttpClientRequest instances
361 @return: The list of requests passed in
364 # _HttpClientPendingRequest is used for internal thread synchronization
365 pending = [_HttpClientPendingRequest(req) for req in requests]
368 # Add requests to queue
369 for pend_req in pending:
370 self._wpool.AddTask(pend_req)
373 # In case of an exception we should still wait for the rest, otherwise
374 # another thread from the worker pool could modify the request object
377 # And wait for them to finish
378 for pend_req in pending:
381 # Return original list
385 self._wpool.Quiesce()
386 self._wpool.TerminateWorkers()