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#!/usr/bin/python
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#
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Master daemon program.
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Some classes deviates from the standard style guide since the
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inheritance from parent classes requires it.
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"""
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import SocketServer
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import threading
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import time
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import collections
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import Queue
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import random
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import signal
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import simplejson
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from cStringIO import StringIO
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from ganeti import constants
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from ganeti import mcpu
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from ganeti import opcodes
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from ganeti import jqueue
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from ganeti import luxi
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from ganeti import utils
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class IOServer(SocketServer.UnixStreamServer):
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"""IO thread class.
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This class takes care of initializing the other threads, setting
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signal handlers (which are processed only in this thread), and doing
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cleanup at shutdown.
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"""
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QUEUE_PROCESSOR_SIZE = 1
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def __init__(self, address, rqhandler):
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SocketServer.UnixStreamServer.__init__(self, address, rqhandler)
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self.do_quit = False
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self.queue = jqueue.QueueManager()
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self.processors = []
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for i in range(self.QUEUE_PROCESSOR_SIZE):
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self.processors.append(threading.Thread(target=PoolWorker,
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args=(i, self.queue.new_queue)))
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for t in self.processors:
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t.start()
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signal.signal(signal.SIGINT, self.handle_sigint)
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def process_request_thread(self, request, client_address):
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"""Process the request.
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This is copied from the code in ThreadingMixIn.
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"""
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try:
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self.finish_request(request, client_address)
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self.close_request(request)
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except:
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self.handle_error(request, client_address)
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self.close_request(request)
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def process_request(self, request, client_address):
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"""Start a new thread to process the request.
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This is copied from the coode in ThreadingMixIn.
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"""
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t = threading.Thread(target=self.process_request_thread,
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args=(request, client_address))
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t.start()
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def handle_sigint(self, signum, frame):
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print "received %s in %s" % (signum, frame)
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self.do_quit = True
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self.server_close()
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for i in range(self.QUEUE_PROCESSOR_SIZE):
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self.queue.new_queue.put(None)
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def serve_forever(self):
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"""Handle one request at a time until told to quit."""
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while not self.do_quit:
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self.handle_request()
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class ClientRqHandler(SocketServer.BaseRequestHandler):
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"""Client handler"""
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EOM = '\3'
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READ_SIZE = 4096
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def setup(self):
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self._buffer = ""
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self._msgs = collections.deque()
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self._ops = ClientOps(self.server)
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def handle(self):
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while True:
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msg = self.read_message()
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if msg is None:
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print "client closed connection"
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break
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request = simplejson.loads(msg)
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if not isinstance(request, dict):
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print "wrong request received: %s" % msg
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break
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method = request.get('request', None)
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data = request.get('data', None)
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if method is None or data is None:
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print "no method or data in request"
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break
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print "request:", method, data
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result = self._ops.handle_request(method, data)
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print "result:", result
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self.send_message(simplejson.dumps({'success': True, 'result': result}))
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def read_message(self):
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while not self._msgs:
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data = self.request.recv(self.READ_SIZE)
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if not data:
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return None
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new_msgs = (self._buffer + data).split(self.EOM)
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self._buffer = new_msgs.pop()
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self._msgs.extend(new_msgs)
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return self._msgs.popleft()
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def send_message(self, msg):
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#print "sending", msg
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self.request.sendall(msg + self.EOM)
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class ClientOps:
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"""Class holding high-level client operations."""
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def __init__(self, server):
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self.server = server
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self._cpu = None
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def _getcpu(self):
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if self._cpu is None:
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self._cpu = mcpu.Processor(lambda x: None)
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return self._cpu
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def handle_request(self, operation, args):
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print operation, args
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if operation == "submit":
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return self.put(args)
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elif operation == "query":
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path = args["object"]
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if path == "instances":
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return self.query(args)
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else:
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raise ValueError("Invalid operation")
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def put(self, args):
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job = luxi.UnserializeJob(args)
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rid = self.server.queue.put(job)
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return rid
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def query(self, args):
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path = args["object"]
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fields = args["fields"]
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names = args["names"]
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if path == "instances":
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opclass = opcodes.OpQueryInstances
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else:
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raise ValueError("Invalid object %s" % path)
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op = opclass(output_fields = fields, names=names)
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cpu = self._getcpu()
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result = cpu.ExecOpCode(op)
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return result
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def query_job(self, rid):
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rid = int(data)
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job = self.server.queue.query(rid)
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return job
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def JobRunner(proc, job):
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"""Job executor.
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This functions processes a single job in the context of given
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processor instance.
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"""
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job.SetStatus(opcodes.Job.STATUS_RUNNING)
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for op in job.data.op_list:
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proc.ExecOpCode(op)
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job.SetStatus(opcodes.Job.STATUS_FINISHED, result=opcodes.Job.RESULT_OK)
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def PoolWorker(worker_id, incoming_queue):
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"""A worker thread function.
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This is the actual processor of a single thread of Job execution.
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"""
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while True:
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print "worker %s sleeping" % worker_id
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item = incoming_queue.get(True)
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if item is None:
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break
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print "worker %s processing job %s" % (worker_id, item.data.job_id)
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utils.Lock('cmd')
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try:
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proc = mcpu.Processor(feedback=lambda x: None)
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try:
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JobRunner(proc, item)
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except errors.GenericError, err:
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print "ganeti exception %s" % err
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finally:
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utils.Unlock('cmd')
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utils.LockCleanup()
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print "worker %s finish job %s" % (worker_id, item.data.job_id)
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print "worker %s exiting" % worker_id
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def main():
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"""Main function"""
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master = IOServer(constants.MASTER_SOCKET, ClientRqHandler)
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master.serve_forever()
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if __name__ == "__main__":
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main()
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