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1#
2# BitBake XMLRPC Server
3#
4# Copyright (C) 2006 - 2007 Michael 'Mickey' Lauer
5# Copyright (C) 2006 - 2008 Richard Purdie
6#
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License version 2 as
9# published by the Free Software Foundation.
10#
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License along
17# with this program; if not, write to the Free Software Foundation, Inc.,
18# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19
20"""
21 This module implements an xmlrpc server for BitBake.
22
23 Use this by deriving a class from BitBakeXMLRPCServer and then adding
24 methods which you want to "export" via XMLRPC. If the methods have the
25 prefix xmlrpc_, then registering those function will happen automatically,
26 if not, you need to call register_function.
27
28 Use register_idle_function() to add a function which the xmlrpc server
29 calls from within server_forever when no requests are pending. Make sure
30 that those functions are non-blocking or else you will introduce latency
31 in the server's main loop.
32"""
33
34import bb
35import xmlrpclib, sys
36from bb import daemonize
37from bb.ui import uievent
38import hashlib, time
39import socket
40import os, signal
41import threading
42try:
43 import cPickle as pickle
44except ImportError:
45 import pickle
46
47DEBUG = False
48
49from SimpleXMLRPCServer import SimpleXMLRPCServer, SimpleXMLRPCRequestHandler
50import inspect, select, httplib
51
52from . import BitBakeBaseServer, BitBakeBaseServerConnection, BaseImplServer
53
54class BBTransport(xmlrpclib.Transport):
55 def __init__(self, timeout):
56 self.timeout = timeout
57 self.connection_token = None
58 xmlrpclib.Transport.__init__(self)
59
60 # Modified from default to pass timeout to HTTPConnection
61 def make_connection(self, host):
62 #return an existing connection if possible. This allows
63 #HTTP/1.1 keep-alive.
64 if self._connection and host == self._connection[0]:
65 return self._connection[1]
66
67 # create a HTTP connection object from a host descriptor
68 chost, self._extra_headers, x509 = self.get_host_info(host)
69 #store the host argument along with the connection object
70 self._connection = host, httplib.HTTPConnection(chost, timeout=self.timeout)
71 return self._connection[1]
72
73 def set_connection_token(self, token):
74 self.connection_token = token
75
76 def send_content(self, h, body):
77 if self.connection_token:
78 h.putheader("Bitbake-token", self.connection_token)
79 xmlrpclib.Transport.send_content(self, h, body)
80
81def _create_server(host, port, timeout = 60):
82 t = BBTransport(timeout)
83 s = xmlrpclib.ServerProxy("http://%s:%d/" % (host, port), transport=t, allow_none=True)
84 return s, t
85
86class BitBakeServerCommands():
87
88 def __init__(self, server):
89 self.server = server
90 self.has_client = False
91
92 def registerEventHandler(self, host, port):
93 """
94 Register a remote UI Event Handler
95 """
96 s, t = _create_server(host, port)
97
98 # we don't allow connections if the cooker is running
99 if (self.cooker.state in [bb.cooker.state.parsing, bb.cooker.state.running]):
100 return None
101
102 self.event_handle = bb.event.register_UIHhandler(s)
103 return self.event_handle
104
105 def unregisterEventHandler(self, handlerNum):
106 """
107 Unregister a remote UI Event Handler
108 """
109 return bb.event.unregister_UIHhandler(handlerNum)
110
111 def runCommand(self, command):
112 """
113 Run a cooker command on the server
114 """
115 return self.cooker.command.runCommand(command, self.server.readonly)
116
117 def getEventHandle(self):
118 return self.event_handle
119
120 def terminateServer(self):
121 """
122 Trigger the server to quit
123 """
124 self.server.quit = True
125 print("Server (cooker) exiting")
126 return
127
128 def addClient(self):
129 if self.has_client:
130 return None
131 token = hashlib.md5(str(time.time())).hexdigest()
132 self.server.set_connection_token(token)
133 self.has_client = True
134 return token
135
136 def removeClient(self):
137 if self.has_client:
138 self.server.set_connection_token(None)
139 self.has_client = False
140 if self.server.single_use:
141 self.server.quit = True
142
143# This request handler checks if the request has a "Bitbake-token" header
144# field (this comes from the client side) and compares it with its internal
145# "Bitbake-token" field (this comes from the server). If the two are not
146# equal, it is assumed that a client is trying to connect to the server
147# while another client is connected to the server. In this case, a 503 error
148# ("service unavailable") is returned to the client.
149class BitBakeXMLRPCRequestHandler(SimpleXMLRPCRequestHandler):
150 def __init__(self, request, client_address, server):
151 self.server = server
152 SimpleXMLRPCRequestHandler.__init__(self, request, client_address, server)
153
154 def do_POST(self):
155 try:
156 remote_token = self.headers["Bitbake-token"]
157 except:
158 remote_token = None
159 if remote_token != self.server.connection_token and remote_token != "observer":
160 self.report_503()
161 else:
162 if remote_token == "observer":
163 self.server.readonly = True
164 else:
165 self.server.readonly = False
166 SimpleXMLRPCRequestHandler.do_POST(self)
167
168 def report_503(self):
169 self.send_response(503)
170 response = 'No more client allowed'
171 self.send_header("Content-type", "text/plain")
172 self.send_header("Content-length", str(len(response)))
173 self.end_headers()
174 self.wfile.write(response)
175
176
177class XMLRPCProxyServer(BaseImplServer):
178 """ not a real working server, but a stub for a proxy server connection
179
180 """
181 def __init__(self, host, port):
182 self.host = host
183 self.port = port
184
185class XMLRPCServer(SimpleXMLRPCServer, BaseImplServer):
186 # remove this when you're done with debugging
187 # allow_reuse_address = True
188
189 def __init__(self, interface):
190 """
191 Constructor
192 """
193 BaseImplServer.__init__(self)
194 if (interface[1] == 0): # anonymous port, not getting reused
195 self.single_use = True
196 # Use auto port configuration
197 if (interface[1] == -1):
198 interface = (interface[0], 0)
199 SimpleXMLRPCServer.__init__(self, interface,
200 requestHandler=BitBakeXMLRPCRequestHandler,
201 logRequests=False, allow_none=True)
202 self.host, self.port = self.socket.getsockname()
203 self.connection_token = None
204 #self.register_introspection_functions()
205 self.commands = BitBakeServerCommands(self)
206 self.autoregister_all_functions(self.commands, "")
207 self.interface = interface
208 self.single_use = False
209
210 def addcooker(self, cooker):
211 BaseImplServer.addcooker(self, cooker)
212 self.commands.cooker = cooker
213
214 def autoregister_all_functions(self, context, prefix):
215 """
216 Convenience method for registering all functions in the scope
217 of this class that start with a common prefix
218 """
219 methodlist = inspect.getmembers(context, inspect.ismethod)
220 for name, method in methodlist:
221 if name.startswith(prefix):
222 self.register_function(method, name[len(prefix):])
223
224
225 def serve_forever(self):
226 # Start the actual XMLRPC server
227 bb.cooker.server_main(self.cooker, self._serve_forever)
228
229 def _serve_forever(self):
230 """
231 Serve Requests. Overloaded to honor a quit command
232 """
233 self.quit = False
234 while not self.quit:
235 fds = [self]
236 nextsleep = 0.1
237 for function, data in self._idlefuns.items():
238 try:
239 retval = function(self, data, False)
240 if retval is False:
241 del self._idlefuns[function]
242 elif retval is True:
243 nextsleep = 0
244 elif isinstance(retval, float):
245 if (retval < nextsleep):
246 nextsleep = retval
247 else:
248 fds = fds + retval
249 except SystemExit:
250 raise
251 except:
252 import traceback
253 traceback.print_exc()
254 pass
255
256 socktimeout = self.socket.gettimeout() or nextsleep
257 socktimeout = min(socktimeout, nextsleep)
258 # Mirror what BaseServer handle_request would do
259 try:
260 fd_sets = select.select(fds, [], [], socktimeout)
261 if fd_sets[0] and self in fd_sets[0]:
262 self._handle_request_noblock()
263 except IOError:
264 # we ignore interrupted calls
265 pass
266
267 # Tell idle functions we're exiting
268 for function, data in self._idlefuns.items():
269 try:
270 retval = function(self, data, True)
271 except:
272 pass
273 self.server_close()
274 return
275
276 def set_connection_token(self, token):
277 self.connection_token = token
278
279class BitBakeXMLRPCServerConnection(BitBakeBaseServerConnection):
280 def __init__(self, serverImpl, clientinfo=("localhost", 0), observer_only = False, featureset = []):
281 self.connection, self.transport = _create_server(serverImpl.host, serverImpl.port)
282 self.clientinfo = clientinfo
283 self.serverImpl = serverImpl
284 self.observer_only = observer_only
285 self.featureset = featureset
286
287 def connect(self, token = None):
288 if token is None:
289 if self.observer_only:
290 token = "observer"
291 else:
292 token = self.connection.addClient()
293
294 if token is None:
295 return None
296
297 self.transport.set_connection_token(token)
298
299 self.events = uievent.BBUIEventQueue(self.connection, self.clientinfo)
300 for event in bb.event.ui_queue:
301 self.events.queue_event(event)
302
303 _, error = self.connection.runCommand(["setFeatures", self.featureset])
304 if error:
305 # no need to log it here, the error shall be sent to the client
306 raise BaseException(error)
307
308 return self
309
310 def removeClient(self):
311 if not self.observer_only:
312 self.connection.removeClient()
313
314 def terminate(self):
315 # Don't wait for server indefinitely
316 import socket
317 socket.setdefaulttimeout(2)
318 try:
319 self.events.system_quit()
320 except:
321 pass
322 try:
323 self.connection.removeClient()
324 except:
325 pass
326
327class BitBakeServer(BitBakeBaseServer):
328 def initServer(self, interface = ("localhost", 0)):
329 self.interface = interface
330 self.serverImpl = XMLRPCServer(interface)
331
332 def detach(self):
333 daemonize.createDaemon(self.serverImpl.serve_forever, "bitbake-cookerdaemon.log")
334 del self.cooker
335
336 def establishConnection(self, featureset):
337 self.connection = BitBakeXMLRPCServerConnection(self.serverImpl, self.interface, False, featureset)
338 return self.connection.connect()
339
340 def set_connection_token(self, token):
341 self.connection.transport.set_connection_token(token)
342
343class BitBakeXMLRPCClient(BitBakeBaseServer):
344
345 def __init__(self, observer_only = False, token = None):
346 self.token = token
347
348 self.observer_only = observer_only
349 # if we need extra caches, just tell the server to load them all
350 pass
351
352 def saveConnectionDetails(self, remote):
353 self.remote = remote
354
355 def establishConnection(self, featureset):
356 # The format of "remote" must be "server:port"
357 try:
358 [host, port] = self.remote.split(":")
359 port = int(port)
360 except Exception as e:
361 bb.warn("Failed to read remote definition (%s)" % str(e))
362 raise e
363
364 # We need our IP for the server connection. We get the IP
365 # by trying to connect with the server
366 try:
367 s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
368 s.connect((host, port))
369 ip = s.getsockname()[0]
370 s.close()
371 except Exception as e:
372 bb.warn("Could not create socket for %s:%s (%s)" % (host, port, str(e)))
373 raise e
374 try:
375 self.serverImpl = XMLRPCProxyServer(host, port)
376 self.connection = BitBakeXMLRPCServerConnection(self.serverImpl, (ip, 0), self.observer_only, featureset)
377 return self.connection.connect(self.token)
378 except Exception as e:
379 bb.warn("Could not connect to server at %s:%s (%s)" % (host, port, str(e)))
380 raise e
381
382 def endSession(self):
383 self.connection.removeClient()