def send(self, id, buf):
if id not in self.servers:
LOG.error("server %i does not exists", id)
return False
LOG.debug("sending %s to server %i", buf, id)
buf += '\n'
self.servers[id]['process'].stdin.write(buf.encode())
self.servers[id]['process'].stdin.flush()
return True
def add(self, id, ip='127.0.1.1', init=False, join=False):
"""
adds server id to the cluster
:id: new server's id
"""
if id in self.servers:
LOG.error("server %i already exists", id)
return False
elif id < 0 or id > 100:
LOG.error("id %i is out of range [0, 100]", id)
return False
# TODO clean up
args = ['python3', '-m', 'membership', 'server', '-s']
# args += [ip + ':' + str(id) for id in self.servers]
# if init:
# args += [ip + ':' + str(id) for id in range(self.args.count)]
args += [ip + ':' + str(i) for i in range(10)]
if init and id == 0:
args += ['-j']
if join:
args += ['-j']
# else:
# args += [ip + ':' + str(id) for id in self.servers]
# LOG.debug("protocol: %s", self.args.protocol)
if self.args.protocol == 'periodic':
args += ['-p', self.args.protocol]
elif self.args.protocol == 'neighbor':
args += ['-p', self.args.protocol]
elif self.args.protocol == 'list':
args += ['-p', self.args.protocol]
if self.args.verbose:
args.append('-v')
args += ['-i', str(id)]
# open log file
log = open(os.path.join('logs', str(id) + '.log'), 'w')
LOG.info('starting server: %i', id)
LOG.debug('arguments: %s', args)
# spawn child process
if self.args.debug:
p = Popen(args, stdout=sys.stdout, stderr=sys.stderr, stdin=PIPE)
else:
p = Popen(args, stdout=log, stderr=log, stdin=PIPE)
self.servers[id] = {'process': p, 'log': log}
return True
def remove(self, id):
"""
removes server id from the cluster
:id: server id to remove
"""
if id not in self.servers:
LOG.error("server %i does not exists", id)
return False
buf = 'destroy'
LOG.debug("sending %s to server %i", buf, id)
buf += '\n'
self.servers[id]['process'].stdin.write(buf.encode())
self.servers[id]['process'].stdin.flush()
time.sleep(1)
LOG.info("forcibly terminating server %i", id)
self.servers[id]['log'].close()
self.servers[id]['process'].kill()
del self.servers[id]
