Python custom master-slave distributed architecture example analysis

This article mainly introduces Python's custom master-slave distributed architecture, and analyzes the structure, principles and specific code implementation techniques of the master-slave distributed architecture in the form of examples. Friends in need can refer to it

The example in this article describes Python’s custom master-slave distributed architecture. Share it with everyone for your reference, the details are as follows:

Environment: Win7 x64, Python 2.7, APScheduler 2.1.2.

The schematic diagram is as follows:

Code part:

(1), Center node:

#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), task node:

#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()

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