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Initial commit.

Change-Id: Ia612b44511b19e22a73cb6d4662fc02207af9321
changes/54/26254/1
James E. Blair 9 years ago
parent
commit
b6097dc7ed
  1. 8
      .gitignore
  2. 202
      LICENSE
  3. 557
      gear/__init__.py
  4. 58
      gear/constants.py

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.gitignore vendored

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*.egg-info
*.pyc
.tox
AUTHORS
build/*
ChangeLog
doc/build/*
dist/

202
LICENSE

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557
gear/__init__.py

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# Copyright 2013 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import struct
import socket
import threading
import select
import os
import time
import logging
import constants
PRECEDENCE_NORMAL=0
PRECEDENCE_LOW=1
PRECEDENCE_HIGH=2
class ConnectionError(Exception):
pass
class InvalidDataError(Exception):
pass
class ConfigurationError(Exception):
pass
class NoConnectedServersError(Exception):
pass
class UnknownJobError(Exception):
pass
class Connection(object):
log = logging.getLogger("gear.Connection")
def __init__(self, host, port):
self.host = host
self.port = port
self._init()
def _init(self):
self.conn = None
self.connected = False
self.pending_jobs = []
self.related_jobs = {}
def __repr__(self):
return '<gear.Connection 0x%x host: %s port: %s>' % (
id(self), self.host, self.port)
def connect(self):
self.log.debug("Connecting to %s port %s" % (self.host, self.port))
s = None
for res in socket.getaddrinfo(self.host, self.port,
socket.AF_UNSPEC, socket.SOCK_STREAM):
af, socktype, proto, canonname, sa = res
try:
s = socket.socket(af, socktype, proto)
except socket.error as msg:
s = None
continue
try:
s.connect(sa)
except socket.error as msg:
s.close()
s = None
continue
break
if s is None:
self.log.debug("Error connecting to %s port %s" % (
self.host, self.port))
raise ConnectionError("Unable to open socket")
self.log.debug("Connected to %s port %s" % (self.host, self.port))
self.conn = s
self.connected = True
def disconnect(self):
self.log.debug("Disconnected from %s port %s" % (self.host, self.port))
self._init()
def reconnect(self):
self.disconnect()
self.connect()
def sendPacket(self, packet):
self.conn.send(packet.toBinary())
def readPacket(self):
packet = b''
datalen = 0
code = None
ptype = None
while True:
c = self.conn.recv(1)
if not c:
return None
packet += c
if len(packet) == 12:
code, ptype, datalen = struct.unpack('!4sii', packet)
elif len(packet) == datalen+12:
return Packet(code, ptype, packet[12:], connection=self)
class Packet(object):
log = logging.getLogger("gear.Packet")
def __init__(self, code, ptype, data, connection=None):
if code[0] != '\x00':
raise InvalidDataError("First byte of packet must be 0")
self.code = code
self.ptype = ptype
self.data = data
self.connection = connection
def __repr__(self):
ptype = constants.types.get(self.ptype, 'UNKNOWN')
return '<gear.Packet 0x%x type: %s>' % (id(self), ptype)
def toBinary(self):
b = struct.pack('!4sii', self.code, self.ptype, len(self.data))
b += self.data
return b
def getArgument(self, index):
return self.data.split('\x00')[index]
def getJob(self):
handle = self.getArgument(0)
job = self.connection.related_jobs.get(handle)
if not job:
raise UnknownJobError()
return job
class Client(object):
log = logging.getLogger("gear.Client")
def __init__(self):
self.active_connections = []
self.inactive_connections = []
self.connection_index = -1
# A lock and notification mechanism to handle not having any
# current connections
self.connections_condition = threading.Condition()
# A pipe to wake up the poll loop in case it needs to restart
self.wake_read, self.wake_write = os.pipe()
self.poll_thread = threading.Thread(name="Gearman client poll",
target=self._doPollLoop)
self.poll_thread.start()
self.connect_thread = threading.Thread(name="Gearman client connect",
target=self._doConnectLoop)
self.connect_thread.start()
def __repr__(self):
return '<gear.Client 0x%x>' % id(self)
def addServer(self, host, port=4730):
"""Add a server to the client's connection pool.
Any number of Gearman servers may be added to a client. The
client will connect to all of them and send jobs to them in a
round-robin fashion. When servers are disconnected, the
client will automatically remove them from the pool,
continuously try to reconnect to them, and return them to the
pool when reconnected. New servers may be added at any time.
This is a non-blocking call that will return regardless of
whether the initial connection succeeded. If you need to
ensure that a connection is ready before proceeding, see
:py:meth:`waitForServer`.
:arg str host: The hostname or IP address of the server.
:arg int port: The port on which the gearman server is listening.
"""
self.log.debug("Adding server %s port %s" % (host, port))
self.connections_condition.acquire()
try:
for conn in self.active_connections + self.inactive_connections:
if conn.host == host and conn.port == port:
raise ConfigurationError("Host/port already specified")
conn = Connection(host, port)
self.inactive_connections.append(conn)
self.connections_condition.notifyAll()
finally:
self.connections_condition.release()
def waitForServer(self):
"""Wait for at least one server to be connected.
Block until at least one gearman server is connected.
"""
connected = False
while True:
self.connections_condition.acquire()
while not self.active_connections:
self.log.debug("Waiting for at least one active connection")
self.connections_condition.wait()
if self.active_connections:
self.log.debug("Active connection found")
connected = True
self.connections_condition.release()
if connected:
return
def _doConnectLoop(self):
# Outer run method of the reconnection thread
while True:
self.connections_condition.acquire()
while not self.inactive_connections:
self.log.debug("Waiting for change in available servers "
"to reconnect")
self.connections_condition.wait()
self.connections_condition.release()
self.log.debug("Checking if servers need to be reconnected")
try:
if not self._connectLoop():
# Nothing happened
time.sleep(2)
except:
self.log.exception("Exception in connect loop:")
def _connectLoop(self):
# Inner method of the reconnection loop, triggered by
# a connection change
success = False
for conn in self.inactive_connections[:]:
self.log.debug("Trying to reconnect %s" % conn)
try:
conn.reconnect()
except ConnectionError:
self.log.debug("Unable to connect to %s" % conn)
continue
except:
self.log.error("Exception while connecting to %s" % conn)
continue
self.connections_condition.acquire()
self.inactive_connections.remove(conn)
self.active_connections.append(conn)
self.connections_condition.notifyAll()
os.write(self.wake_write, '1\n')
self.connections_condition.release()
success = True
return success
def _lostConnection(self, conn):
# Called as soon as a connection is detected as faulty. Remove
# it and return ASAP and let the connection thread deal with it.
self.log.debug("Marking %s as disconnected" % conn)
self.connections_condition.acquire()
self.active_connections.remove(conn)
self.inactive_connections.append(conn)
self.connections_condition.notifyAll()
self.connections_condition.release()
def getConnection(self):
"""Return a connected server.
Finds the next scheduled connected server in the round-robin
rotation and returns it. It is not usually necessary to use
this method external to the library, as more consumer-oriented
methods such as submitJob already use it internally, but is
available nonetheless if necessary.
"""
conn = None
try:
self.connections_condition.acquire()
if not self.active_connections:
raise NoConnectedServersError("No connected Gearman servers")
self.connection_index += 1
if self.connection_index >= len(self.active_connections):
self.connection_index = 0
conn = self.active_connections[self.connection_index]
finally:
self.connections_condition.release()
return conn
def _doPollLoop(self):
# Outer run method of poll thread.
while True:
self.connections_condition.acquire()
while not self.active_connections:
self.log.debug("Waiting for change in available servers "
"to poll")
self.connections_condition.wait()
self.connections_condition.release()
try:
self._pollLoop()
except:
self.log.exception("Exception in poll loop:")
def _pollLoop(self):
# Inner method of poll loop
self.log.debug("Preparing to poll")
poll = select.poll()
bitmask = (select.POLLIN | select.POLLERR |
select.POLLHUP | select.POLLNVAL)
# Reverse mapping of fd -> connection
conn_dict = {}
for conn in self.active_connections:
poll.register(conn.conn.fileno(), bitmask)
conn_dict[conn.conn.fileno()] = conn
# Register the wake pipe so that we can break if we need to
# reconfigure connections
poll.register(self.wake_read, bitmask)
while True:
self.log.debug("Polling %s connections" %
len(self.active_connections))
ret = poll.poll()
for fd, event in ret:
if fd == self.wake_read:
self.log.debug("Woken by pipe")
while True:
if os.read(self.wake_read, 1) == '\n':
break
return
if event & select.POLLIN:
self.log.debug("Processing input on %s" % conn)
p = conn_dict[fd].readPacket()
if p:
self.handlePacket(p)
else:
self.log.debug("Received no data on %s" % conn)
self._lostConnection(conn_dict[fd])
return
else:
self.log.debug("Received error event on %s" % conn)
self._lostConnection(conn_dict[fd])
return
def submitJob(self, job, background=False, precedence=PRECEDENCE_NORMAL):
"""Submit a job to a Gearman server.
Submits the provided job to the next server in this client's
round-robin connection pool.
If the job is a foreground job, updates will be made to the
supplied :py:class:`Job` object as they are received.
:arg Job job: The :py:class:`Job` to submit.
:arg bool background: Whether the job should be backgrounded.
:arg int precedence: Whether the job should have normal, low, or
high precedence. One of gear.PRECEDENCE_NORMAL,
gear.PRECEDENCE_LOW, gear.PRECEDENCE_HIGH
"""
data = '%s\x00%s\x00%s' % (job.name, job.unique, job.arguments)
if background:
if precedence == PRECEDENCE_NORMAL:
cmd = constants.SUBMIT_JOB_BG
elif precedence == PRECEDENCE_LOW:
cmd = constants.SUBMIT_JOB_LOW_BG
elif precedence == PRECEDENCE_HIGH:
cmd = constants.SUBMIT_JOB_HIGH_BG
else:
raise ConfigurationError("Invalid precedence value")
else:
if precedence == PRECEDENCE_NORMAL:
cmd = constants.SUBMIT_JOB
elif precedence == PRECEDENCE_LOW:
cmd = constants.SUBMIT_JOB_LOW
elif precedence == PRECEDENCE_HIGH:
cmd = constants.SUBMIT_JOB_HIGH
else:
raise ConfigurationError("Invalid precedence value")
p = Packet(constants.REQ, cmd, data)
while True:
conn = self.getConnection()
conn.pending_jobs.append(job)
try:
conn.sendPacket(p)
return
except:
self.log.exception("Exception while submitting job %s to %s" %
(job, conn))
conn.pending_jobs.remove(job)
# If we can't send the packet, discard the connection and
# try again
self._lostConnection(conn_dict[fd])
def handlePacket(self, packet):
"""Handle a packet received from a Gearman server.
This method is called whenever a packet is received from any
of this client's connections. It normally calls the handle
method appropriate for the specific packet.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
self.log.debug("Received packet %s" % packet)
if packet.ptype == constants.JOB_CREATED:
self.handleJobCreated(packet)
elif packet.ptype == constants.WORK_COMPLETE:
self.handleWorkComplete(packet)
def handleJobCreated(self, packet):
"""Handle a JOB_CREATED packet.
Updates the appropriate :py:class:`Job` with the newly
returned job handle.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
job = packet.connection.pending_jobs.pop(0)
job.handle = packet.data
packet.connection.related_jobs[job.handle] = job
def handleWorkComplete(self, packet):
"""Handle a WORK_COMPLETE packet.
Updates the referenced :py:class:`Job` with the returned data
and removes it from the list of jobs associated with the
connection.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
job = packet.getJob()
job.data += packet.getArgument(1)
job.complete = True
job.failure = False
del packet.connection.related_jobs[job.handle]
def handleWorkFail(self, packet):
"""Handle a WORK_FAIL packet.
Updates the referenced :py:class:`Job` with the returned data
and removes it from the list of jobs associated with the
connection.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
job = packet.getJob()
job.complete = True
job.failure = True
del packet.connection.related_jobs[job.handle]
def handleWorkException(self, packet):
"""Handle a WORK_Exception packet.
Updates the referenced :py:class:`Job` with the returned data
and removes it from the list of jobs associated with the
connection.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
job = packet.getJob()
job.exception = packet.getArgument(1)
job.complete = True
job.failure = True
del packet.connection.related_jobs[job.handle]
def handleWorkData(self, packet):
"""Handle a WORK_DATA packet.
Updates the referenced :py:class:`Job` with the returned data.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
job = packet.getJob()
job.data += packet.getArgument(1)
def handleWorkWarning(self, packet):
"""Handle a WORK_WARNING packet.
Updates the referenced :py:class:`Job` with the returned data.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
job = packet.getJob()
job.data += packet.getArgument(1)
job.warning = True
def handleWorkStatus(self, packet):
"""Handle a WORK_STATUS packet.
Updates the referenced :py:class:`Job` with the returned data.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
job = packet.getJob()
job.numerator = packet.getArgument(1)
job.denominator = packet.getArgument(1)
try:
job.percent_complete = float(job.numerator)/float(job.denominator)
except:
job.percent_complete = None
def handleStatusRes(self, packet):
"""Handle a STATUS_RES packet.
Updates the referenced :py:class:`Job` with the returned data.
:arg Packet packet: The :py:class:`Packet` that was received.
"""
job = packet.getJob()
job.known = (packet.getArgument(1) == 1)
job.running = (packet.getArgument(2) == 1)
job.numerator = packet.getArgument(3)
job.denominator = packet.getArgument(4)
try:
job.percent_complete = float(job.numerator)/float(job.denominator)
except:
job.percent_complete = None
class Job(object):
log = logging.getLogger("gear.Job")
def __init__(self, name, arguments, unique):
self.name = name
self.arguments = arguments
self.unique = unique
self.handle = None
self.data = b''
self.exception = None
self.warning = False
self.complete = False
self.failure = False
self.numerator = None
self.denominator = None
self.percent_complete = None
self.known = None
self.running = None
def __repr__(self):
return '<gear.Job 0x%x handle: %s name: %s unique: %s>' % (
id(self), self.handle, self.name, self.unique)

58
gear/constants.py

@ -0,0 +1,58 @@
# Copyright 2013 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
types = {
1: 'CAN_DO',
2: 'CANT_DO',
3: 'RESET_ABILITIES',
4: 'PRE_SLEEP',
#unused
6: 'NOOP',
7: 'SUBMIT_JOB',
8: 'JOB_CREATED',
9: 'GRAB_JOB',
10: 'NO_JOB',
11: 'JOB_ASSIGN',
12: 'WORK_STATUS',
13: 'WORK_COMPLETE',
14: 'WORK_FAIL',
15: 'GET_STATUS',
16: 'ECHO_REQ',
17: 'ECHO_RES',
18: 'SUBMIT_JOB_BG',
19: 'ERROR',
20: 'STATUS_RES',
21: 'SUBMIT_JOB_HIGH',
22: 'SET_CLIENT_ID',
23: 'CAN_DO_TIMEOUT',
24: 'ALL_YOURS',
25: 'WORK_EXCEPTION',
26: 'OPTION_REQ',
27: 'OPTION_RES',
28: 'WORK_DATA',
29: 'WORK_WARNING',
30: 'GRAB_JOB_UNIQ',
31: 'JOB_ASSIGN_UNIQ',
32: 'SUBMIT_JOB_HIGH_BG',
33: 'SUBMIT_JOB_LOW',
34: 'SUBMIT_JOB_LOW_BG',
35: 'SUBMIT_JOB_SCHED',
36: 'SUBMIT_JOB_EPOCH',
}
for i, name in types.items():
globals()[name]=i
REQ = '\x00REQ'
RES = '\x00RES'
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