Commit ffeffa1d authored by Iustin Pop's avatar Iustin Pop
Browse files

Initial tests with ganeti-masterd

This patch adds a very in-progress master daemon. This needs to be
launched manually, does not background itself, but can be used for
opcode execution.

Also parts of this code should be moved to luxi.py.

Reviewed-by: ultrotter
parent 99e2be3b
dist_sbin_SCRIPTS = ganeti-noded ganeti-watcher ganeti-master
dist_sbin_SCRIPTS = ganeti-noded ganeti-watcher ganeti-master ganeti-masterd
#!/usr/bin/python
#
# Copyright (C) 2006, 2007 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
"""Master daemon program.
Some classes deviates from the standard style guide since the
inheritance from parent classes requires it.
"""
import SocketServer
import threading
import time
import collections
import Queue
import random
import signal
import simplejson
from cStringIO import StringIO
from ganeti import constants
from ganeti import mcpu
from ganeti import opcodes
from ganeti import jqueue
from ganeti import luxi
from ganeti import utils
class IOServer(SocketServer.UnixStreamServer):
"""IO thread class.
This class takes care of initializing the other threads, setting
signal handlers (which are processed only in this thread), and doing
cleanup at shutdown.
"""
QUEUE_PROCESSOR_SIZE = 1
def __init__(self, address, rqhandler):
SocketServer.UnixStreamServer.__init__(self, address, rqhandler)
self.do_quit = False
self.queue = jqueue.QueueManager()
self.processors = []
for i in range(self.QUEUE_PROCESSOR_SIZE):
self.processors.append(threading.Thread(target=PoolWorker,
args=(i, self.queue.new_queue)))
for t in self.processors:
t.start()
signal.signal(signal.SIGINT, self.handle_sigint)
def process_request_thread(self, request, client_address):
"""Process the request.
This is copied from the code in ThreadingMixIn.
"""
try:
self.finish_request(request, client_address)
self.close_request(request)
except:
self.handle_error(request, client_address)
self.close_request(request)
def process_request(self, request, client_address):
"""Start a new thread to process the request.
This is copied from the coode in ThreadingMixIn.
"""
t = threading.Thread(target=self.process_request_thread,
args=(request, client_address))
t.start()
def handle_sigint(self, signum, frame):
print "received %s in %s" % (signum, frame)
self.do_quit = True
self.server_close()
for i in range(self.QUEUE_PROCESSOR_SIZE):
self.queue.new_queue.put(None)
def serve_forever(self):
"""Handle one request at a time until told to quit."""
while not self.do_quit:
self.handle_request()
class ClientRqHandler(SocketServer.BaseRequestHandler):
"""Client handler"""
EOM = '\3'
READ_SIZE = 4096
def setup(self):
self._buffer = ""
self._msgs = collections.deque()
self._ops = ClientOps(self.server)
def handle(self):
while True:
msg = self.read_message()
if msg is None:
print "client closed connection"
break
request = simplejson.loads(msg)
if not isinstance(request, dict):
print "wrong request received: %s" % msg
break
method = request.get('request', None)
data = request.get('data', None)
if method is None or data is None:
print "no method or data in request"
break
print "request:", method, data
result = self._ops.handle_request(method, data)
print "result:", result
self.send_message(simplejson.dumps({'success': True, 'result': result}))
def read_message(self):
while not self._msgs:
data = self.request.recv(self.READ_SIZE)
if not data:
return None
new_msgs = (self._buffer + data).split(self.EOM)
self._buffer = new_msgs.pop()
self._msgs.extend(new_msgs)
return self._msgs.popleft()
def send_message(self, msg):
#print "sending", msg
self.request.sendall(msg + self.EOM)
class ClientOps:
"""Class holding high-level client operations."""
def __init__(self, server):
self.server = server
self._cpu = None
def _getcpu(self):
if self._cpu is None:
self._cpu = mcpu.Processor(lambda x: None)
return self._cpu
def handle_request(self, operation, args):
print operation, args
if operation == "submit":
return self.put(args)
elif operation == "query":
path = args["object"]
if path == "instances":
return self.query(args)
else:
raise ValueError("Invalid operation")
def put(self, args):
job = luxi.UnserializeJob(args)
rid = self.server.queue.put(job)
return rid
def query(self, args):
path = args["object"]
fields = args["fields"]
names = args["names"]
if path == "instances":
opclass = opcodes.OpQueryInstances
else:
raise ValueError("Invalid object %s" % path)
op = opclass(output_fields = fields, names=names)
cpu = self._getcpu()
result = cpu.ExecOpCode(op)
return result
def query_job(self, rid):
rid = int(data)
job = self.server.queue.query(rid)
return job
def JobRunner(proc, job):
"""Job executor.
This functions processes a single job in the context of given
processor instance.
"""
job.SetStatus(opcodes.Job.STATUS_RUNNING)
for op in job.data.op_list:
proc.ExecOpCode(op)
job.SetStatus(opcodes.Job.STATUS_FINISHED, result=opcodes.Job.RESULT_OK)
def PoolWorker(worker_id, incoming_queue):
"""A worker thread function.
This is the actual processor of a single thread of Job execution.
"""
while True:
print "worker %s sleeping" % worker_id
item = incoming_queue.get(True)
if item is None:
break
print "worker %s processing job %s" % (worker_id, item.data.job_id)
utils.Lock('cmd')
try:
proc = mcpu.Processor(feedback=lambda x: None)
try:
JobRunner(proc, item)
except errors.GenericError, err:
print "ganeti exception %s" % err
finally:
utils.Unlock('cmd')
utils.LockCleanup()
print "worker %s finish job %s" % (worker_id, item.data.job_id)
print "worker %s exiting" % worker_id
def main():
"""Main function"""
master = IOServer(constants.MASTER_SOCKET, ClientRqHandler)
master.serve_forever()
if __name__ == "__main__":
main()
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