本文实例讲述了Python自定义主从分布式架构。分享给大家供大家参考,具体如下:
环境:Win7 x64,Python 2.7,APScheduler 2.1.2。
原理图如下:
代码部分:
(1)、中心节点:
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#encoding=utf-8 #author: walker #date: 2014-12-03 #function: 中心节点(主要功能是分配任务) import SocketServer, socket, Queue CenterIP = '127.0.0.1' #中心节点IP CenterListenPort = 9999 #中心节点监听端口 CenterClient = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) #中心节点用于发送网络消息的socket TaskQueue = Queue.Queue() #任务队列 #获取任务队列 def GetTaskQueue(): for i in range ( 1 , 11 ): TaskQueue.put( str (i)) #CenterServer的回调函数,在接受到udp报文是触发 class MyUDPHandler(SocketServer.BaseRequestHandler): def handle( self ): data = self .request[ 0 ].strip() socket = self .request[ 1 ] print (data) if data.startswith( 'wait' ): vec = data.split( ':' ) if len (vec) ! = 3 : print ( 'Error: len(vec) != 3' ) else : nodeIP = vec[ 1 ] nodeListenPort = vec[ 2 ] nodeID = nodeIP + ':' + nodeListenPort if not TaskQueue.empty(): task = TaskQueue.get() print ( 'send task ' + task + ' to ' + nodeID) CenterClient.sendto( 'task:' + task, (nodeIP, int (nodeListenPort))) else : print ( 'TaskQueue is empty!' ) GetTaskQueue() #获取任务队列 CenterServer = SocketServer.UDPServer((CenterIP, CenterListenPort), MyUDPHandler) print ( 'Listen port ' + str (CenterListenPort) + ' ...' ) CenterServer.serve_forever() |
(2)、任务节点:
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#encoding=utf-8 #author: walker #date: 2014-12-03 #function: 任务节点(请求/接收/执行任务) import time, socket, SocketServer from apscheduler.scheduler import Scheduler CenterIP = '127.0.0.1' #中心节点IP CenterListenPort = 9999 #中心节点监听端口 NodeIP = socket.gethostbyname(socket.gethostname()) #任务节点自身IP NodeClient = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) #任务节点用于发送网络消息的socket #任务:发送网络信息 def jobSendNetMsg(): msg = '' if NodeServer.TaskState = = 'wait' : msg = 'wait:' + NodeIP + ':' + str (NodeListenPort) elif NodeServer.TaskState = = 'exec' : msg = 'exec:' + NodeIP + ':' + str (NodeListenPort) print (msg) NodeClient.sendto(msg, (CenterIP, CenterListenPort)) #添加并启动定时任务 def InitTimer(): sched = Scheduler() sched.add_interval_job(jobSendNetMsg, seconds = 1 ) sched.start() #执行任务 def ExecTask(task): print ( 'ExecTask ' + task + ' ...' ) time.sleep( 2 ) print ( 'ExecTask ' + task + ' over' ) #NodeServer的回调函数,在接受到udp报文是触发 class MyUDPHandler(SocketServer.BaseRequestHandler): def handle( self ): data = self .request[ 0 ].strip() socket = self .request[ 1 ] print ( 'recv data: ' + data) if data.startswith( 'task' ): vec = data.split( ':' ) if len (vec) ! = 2 : print ( 'Error: len(vec) != 2' ) else : task = vec[ 1 ] self .server.TaskState = 'exec' ExecTask(task) self .server.TaskState = 'wait' InitTimer() NodeServer = SocketServer.UDPServer(('', 0 ), MyUDPHandler) NodeServer.TaskState = 'wait' #(exec/wait) NodeListenPort = NodeServer.server_address[ 1 ] print ( 'NodeListenPort:' + str (NodeListenPort)) NodeServer.serve_forever() |
希望本文所述对大家Python程序设计有所帮助。