Python自訂主從分布式架構執行個體分析,python執行個體分析
本文執行個體講述了Python自訂主從分布式架構。分享給大家供大家參考,具體如下:
環境:Win7 x64,Python 2.7,APScheduler 2.1.2。
原理圖如下:
代碼部分:
(1)、中心節點:
#encoding=utf-8#author: walker#date: 2014-12-03#function: 中心節點(主要功能是分配任務)import SocketServer, socket, QueueCenterIP = '127.0.0.1' #中心節點IPCenterListenPort = 9999 #中心節點監聽連接埠CenterClient = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) #中心節點用於發送網路訊息的socketTaskQueue = Queue.Queue() #任務隊列#擷取任務隊列def GetTaskQueue(): for i in range(1, 11): TaskQueue.put(str(i))#CenterServer的回呼函數,在接受到udp報文是觸發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() #擷取任務隊列CenterServer = SocketServer.UDPServer((CenterIP, CenterListenPort), MyUDPHandler)print('Listen port ' + str(CenterListenPort) + ' ...')CenterServer.serve_forever()
(2)、任務節點:
#encoding=utf-8#author: walker#date: 2014-12-03#function: 任務節點(請求/接收/執行任務)import time, socket, SocketServerfrom apscheduler.scheduler import SchedulerCenterIP = '127.0.0.1' #中心節點IPCenterListenPort = 9999 #中心節點監聽連接埠NodeIP = socket.gethostbyname(socket.gethostname()) #任務節點自身IPNodeClient = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) #任務節點用於發送網路訊息的socket#任務:發送網路資訊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))#添加並啟動定時任務def InitTimer(): sched = Scheduler() sched.add_interval_job(jobSendNetMsg, seconds=1) sched.start()#執行任務def ExecTask(task): print('ExecTask ' + task + ' ...') time.sleep(2) print('ExecTask ' + task + ' over')#NodeServer的回呼函數,在接受到udp報文是觸發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()