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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.Server("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, featureset = []):
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 original_featureset = list(self.cooker.featureset)
103 for f in featureset:
104 self.cooker.featureset.setFeature(f)
105
106 if (original_featureset != list(self.cooker.featureset)):
107 self.cooker.reset()
108
109 self.event_handle = bb.event.register_UIHhandler(s)
110 return self.event_handle
111
112 def unregisterEventHandler(self, handlerNum):
113 """
114 Unregister a remote UI Event Handler
115 """
116 return bb.event.unregister_UIHhandler(handlerNum)
117
118 def runCommand(self, command):
119 """
120 Run a cooker command on the server
121 """
122 return self.cooker.command.runCommand(command, self.server.readonly)
123
124 def getEventHandle(self):
125 return self.event_handle
126
127 def terminateServer(self):
128 """
129 Trigger the server to quit
130 """
131 self.server.quit = True
132 print("Server (cooker) exiting")
133 return
134
135 def addClient(self):
136 if self.has_client:
137 return None
138 token = hashlib.md5(str(time.time())).hexdigest()
139 self.server.set_connection_token(token)
140 self.has_client = True
141 return token
142
143 def removeClient(self):
144 if self.has_client:
145 self.server.set_connection_token(None)
146 self.has_client = False
147 if self.server.single_use:
148 self.server.quit = True
149
150# This request handler checks if the request has a "Bitbake-token" header
151# field (this comes from the client side) and compares it with its internal
152# "Bitbake-token" field (this comes from the server). If the two are not
153# equal, it is assumed that a client is trying to connect to the server
154# while another client is connected to the server. In this case, a 503 error
155# ("service unavailable") is returned to the client.
156class BitBakeXMLRPCRequestHandler(SimpleXMLRPCRequestHandler):
157 def __init__(self, request, client_address, server):
158 self.server = server
159 SimpleXMLRPCRequestHandler.__init__(self, request, client_address, server)
160
161 def do_POST(self):
162 try:
163 remote_token = self.headers["Bitbake-token"]
164 except:
165 remote_token = None
166 if remote_token != self.server.connection_token and remote_token != "observer":
167 self.report_503()
168 else:
169 if remote_token == "observer":
170 self.server.readonly = True
171 else:
172 self.server.readonly = False
173 SimpleXMLRPCRequestHandler.do_POST(self)
174
175 def report_503(self):
176 self.send_response(503)
177 response = 'No more client allowed'
178 self.send_header("Content-type", "text/plain")
179 self.send_header("Content-length", str(len(response)))
180 self.end_headers()
181 self.wfile.write(response)
182
183
184class XMLRPCProxyServer(BaseImplServer):
185 """ not a real working server, but a stub for a proxy server connection
186
187 """
188 def __init__(self, host, port):
189 self.host = host
190 self.port = port
191
192class XMLRPCServer(SimpleXMLRPCServer, BaseImplServer):
193 # remove this when you're done with debugging
194 # allow_reuse_address = True
195
196 def __init__(self, interface):
197 """
198 Constructor
199 """
200 BaseImplServer.__init__(self)
201 SimpleXMLRPCServer.__init__(self, interface,
202 requestHandler=BitBakeXMLRPCRequestHandler,
203 logRequests=False, allow_none=True)
204 self.host, self.port = self.socket.getsockname()
205 self.connection_token = None
206 #self.register_introspection_functions()
207 self.commands = BitBakeServerCommands(self)
208 self.autoregister_all_functions(self.commands, "")
209 self.interface = interface
210 self.single_use = False
211 if (interface[1] == 0): # anonymous port, not getting reused
212 self.single_use = True
213
214 def addcooker(self, cooker):
215 BaseImplServer.addcooker(self, cooker)
216 self.commands.cooker = cooker
217
218 def autoregister_all_functions(self, context, prefix):
219 """
220 Convenience method for registering all functions in the scope
221 of this class that start with a common prefix
222 """
223 methodlist = inspect.getmembers(context, inspect.ismethod)
224 for name, method in methodlist:
225 if name.startswith(prefix):
226 self.register_function(method, name[len(prefix):])
227
228
229 def serve_forever(self):
230 # Start the actual XMLRPC server
231 bb.cooker.server_main(self.cooker, self._serve_forever)
232
233 def _serve_forever(self):
234 """
235 Serve Requests. Overloaded to honor a quit command
236 """
237 self.quit = False
238 while not self.quit:
239 fds = [self]
240 nextsleep = 0.1
241 for function, data in self._idlefuns.items():
242 try:
243 retval = function(self, data, False)
244 if retval is False:
245 del self._idlefuns[function]
246 elif retval is True:
247 nextsleep = 0
248 else:
249 fds = fds + retval
250 except SystemExit:
251 raise
252 except:
253 import traceback
254 traceback.print_exc()
255 pass
256
257 socktimeout = self.socket.gettimeout() or nextsleep
258 socktimeout = min(socktimeout, nextsleep)
259 # Mirror what BaseServer handle_request would do
260 fd_sets = select.select(fds, [], [], socktimeout)
261 if fd_sets[0] and self in fd_sets[0]:
262 self._handle_request_noblock()
263
264 # Tell idle functions we're exiting
265 for function, data in self._idlefuns.items():
266 try:
267 retval = function(self, data, True)
268 except:
269 pass
270 self.server_close()
271 return
272
273 def set_connection_token(self, token):
274 self.connection_token = token
275
276class BitBakeXMLRPCServerConnection(BitBakeBaseServerConnection):
277 def __init__(self, serverImpl, clientinfo=("localhost", 0), observer_only = False, featureset = []):
278 self.connection, self.transport = _create_server(serverImpl.host, serverImpl.port)
279 self.clientinfo = clientinfo
280 self.serverImpl = serverImpl
281 self.observer_only = observer_only
282 self.featureset = featureset
283
284 def connect(self):
285 if not self.observer_only:
286 token = self.connection.addClient()
287 else:
288 token = "observer"
289 if token is None:
290 return None
291 self.transport.set_connection_token(token)
292
293 self.events = uievent.BBUIEventQueue(self.connection, self.clientinfo, self.featureset)
294 for event in bb.event.ui_queue:
295 self.events.queue_event(event)
296 return self
297
298 def removeClient(self):
299 if not self.observer_only:
300 self.connection.removeClient()
301
302 def terminate(self):
303 # Don't wait for server indefinitely
304 import socket
305 socket.setdefaulttimeout(2)
306 try:
307 self.events.system_quit()
308 except:
309 pass
310 try:
311 self.connection.removeClient()
312 except:
313 pass
314
315class BitBakeServer(BitBakeBaseServer):
316 def initServer(self, interface = ("localhost", 0)):
317 self.interface = interface
318 self.serverImpl = XMLRPCServer(interface)
319
320 def detach(self):
321 daemonize.createDaemon(self.serverImpl.serve_forever, "bitbake-cookerdaemon.log")
322 del self.cooker
323
324 def establishConnection(self, featureset):
325 self.connection = BitBakeXMLRPCServerConnection(self.serverImpl, self.interface, False, featureset)
326 return self.connection.connect()
327
328 def set_connection_token(self, token):
329 self.connection.transport.set_connection_token(token)
330
331class BitBakeXMLRPCClient(BitBakeBaseServer):
332
333 def __init__(self, observer_only = False):
334 self.observer_only = observer_only
335 # if we need extra caches, just tell the server to load them all
336 pass
337
338 def saveConnectionDetails(self, remote):
339 self.remote = remote
340
341 def establishConnection(self, featureset):
342 # The format of "remote" must be "server:port"
343 try:
344 [host, port] = self.remote.split(":")
345 port = int(port)
346 except:
347 return None
348 # We need our IP for the server connection. We get the IP
349 # by trying to connect with the server
350 try:
351 s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
352 s.connect((host, port))
353 ip = s.getsockname()[0]
354 s.close()
355 except:
356 return None
357 try:
358 self.serverImpl = XMLRPCProxyServer(host, port)
359 self.connection = BitBakeXMLRPCServerConnection(self.serverImpl, (ip, 0), self.observer_only, featureset)
360 return self.connection.connect()
361 except Exception as e:
362 bb.fatal("Could not connect to server at %s:%s (%s)" % (host, port, str(e)))
363
364 def endSession(self):
365 self.connection.removeClient()