5.術(shù)語解釋，Connector：類似于socket的TcpClient，Lisenter：類似于socket的TcpServer，每個(gè)connector或者listener都一個(gè)一個(gè)ident標(biāo)識(shí)，發(fā)送和接收數(shù)據(jù)時(shí)就知道是誰的數(shù)據(jù)了。

6.使用sqlite持久化時(shí)，需要修改源碼，sqlite3.connect(filename,check_same_thread = False)，用于解決多線程訪問sqlite的問題。（會(huì)不會(huì)死鎖？）

7.啟動(dòng)持久化時(shí)，如果重新連上，則會(huì)自動(dòng)發(fā)送，保證可靠。

8.為了封裝的需要，數(shù)據(jù)接收以后，我通過callback方式傳送出去。

三、代碼

說明代碼中使用了自定義的日志模塊

from common import nxlogger

import snakemqlogger as logger

可替換成logging的。

回調(diào)類（callbacks.py）：

# -*- coding:utf-8 -*-

'''synchronized callback'''

class Callback(object):

  def __init__(self):

    self.callbacks = []

 

  def add(self, func):

    self.callbacks.append(func)

 

  def remove(self, func):

    self.callbacks.remove(func)

 

  def __call__(self, *args, **kwargs):

    for callback in self.callbacks:

      callback(*args, **kwargs)

Connector類（snakemqConnector.py）：

# -*- coding:utf-8 -*-

import threading

import snakemq

import snakemq.link

import snakemq.packeter

import snakemq.messaging

import snakemq.message

from snakemq.storage.sqlite import SqliteQueuesStorage

from snakemq.message import FLAG_PERSISTENT

from common.callbacks import Callback

 

from common import nxlogger

import snakemqlogger as logger

 

class SnakemqConnector(threading.Thread):

     def __init__(self, snakemqident = None, remoteIp = "localhost", remotePort = 9090, persistent = False):

         super(SnakemqConnector,self).__init__()

         self.messaging = None

         self.link = None

         self.snakemqident = snakemqident

         self.pktr = None

         self.remoteIp = remoteIp

         self.remotePort = remotePort

         self.persistent = persistent

         self.on_recv = Callback()

         self._initConnector()

 

     def run(self):

         logger.info("connector start...")

         

         if self.link != None:

              self.link.loop()

 

         logger.info("connector end...")

    

     def terminate(self):

         logger.info("connetor terminating...")

         if self.link != None:

              self.link.stop()

              self.link.cleanup()

         logger.info("connetor terminated")

 

     def on_recv_message(self, conn, ident, message):

         try:

              self.on_recv(ident, message.data.decode('utf-8'))#dispatch received data

         except Exception as e:

              logger.error("connector recv:{0}".format(e))

              print(e)

 

     '''send message to dest host named destIdent'''

     def sendMsg(self, destIdent, byteseq):

         msg = None

         if self.persistent:

              msg = snakemq.message.Message(byteseq, ttl=60, flags=FLAG_PERSISTENT)

         else:

              msg = snakemq.message.Message(byteseq, ttl=60)

         if self.messaging == None:

              logger.error("connector:messaging is not initialized, send message failed")

              return

         self.messaging.send_message(destIdent, msg)

 

     '''

    

     '''

     def _initConnector(self):

         try:

              self.link = snakemq.link.Link()

              self.link.add_connector((self.remoteIp, self.remotePort))

 

              self.pktr = snakemq.packeter.Packeter(self.link)

 

              if self.persistent:

                  storage = SqliteQueuesStorage("SnakemqStorage.db")

                  self.messaging = snakemq.messaging.Messaging(self.snakemqident, "", self.pktr, storage)

              else:

                  self.messaging = snakemq.messaging.Messaging(self.snakemqident, "", self.pktr)

             

              self.messaging.on_message_recv.add(self.on_recv_message)

             

         except Exception as e:

              logger.error("connector:{0}".format(e))

         finally:

              logger.info("connector[{0}] loop ended...".format(self.snakemqident))

Listener類（snakemqListener.py）：

# -*- coding:utf-8 -*-

import threading

import snakemq

import snakemq.link

import snakemq.packeter

import snakemq.messaging

import snakemq.message

from common import nxlogger

import snakemqlogger as logger

from common.callbacks import Callback

class SnakemqListener(threading.Thread):

     def __init__(self, snakemqident = None, ip = "localhost", port = 9090, persistent = False):

         super(SnakemqListener,self).__init__()

         self.messaging = None

         self.link = None

         self.pktr = None

         self.snakemqident = snakemqident

         self.ip = ip;

         self.port = port

         self.connectors = {}

         self.on_recv = Callback()

         self.persistent = persistent

         self._initlistener()

 

     '''

     thread run

     '''

     def run(self):

         logger.info("listener start...")

         

         if self.link != None:

              self.link.loop()

 

         logger.info("listener end...")

 

     '''

     terminate snakemq listener thread

     '''

     def terminate(self):

         logger.info("listener terminating...")

         if self.link != None:

              self.link.stop()

              self.link.cleanup()

         logger.info("listener terminated")

 

     '''

     receive message from host named ident

     '''

     def on_recv_message(self, conn, ident, message):

         try:

              self.on_recv(ident, message.data.decode('utf-8'))#dispatch received data

              self.sendMsg('bob','hello,{0}'.format(ident).encode('utf-8'))

         except Exception as e:

              logger.error("listener recv:{0}".format(e))

              print(e)

 

     def on_drop_message(self, ident, message):

         print("message dropped", ident, message)

         logger.debug("listener:message dropped,ident:{0},message:{1}".format(ident, message))

 

     '''client connect'''

     def on_connect(self, ident):

         logger.debug("listener:{0} connected".format(ident))

         self.connectors[ident] = ident

         self.sendMsg(ident, "hello".encode('utf-8'))

 

     '''client disconnect'''

     def on_disconnect(self, ident):

         logger.debug("listener:{0} disconnected".format(ident))

         if ident in self.connectors:

              self.connectors.pop(ident)

 

     '''

     listen start loop

     '''

     def _initlistener(self):

         try:

              self.link = snakemq.link.Link()

              self.link.add_listener((self.ip, self.port))

 

              self.pktr = snakemq.packeter.Packeter(self.link)

              self.pktr.on_connect.add(self.on_connect)

              self.pktr.on_disconnect.add(self.on_disconnect)

 

              if self.persistent:

                  storage = SqliteQueuesStorage("SnakemqStorage.db")

                  self.messaging = snakemq.messaging.Messaging(self.snakemqident, "", self.pktr, storage)

              else:

                  self.messaging = snakemq.messaging.Messaging(self.snakemqident, "", self.pktr)

             

              self.messaging.on_message_recv.add(self.on_recv_message)

              self.messaging.on_message_drop.add(self.on_drop_message)

 

         except Exception as e:

              logger.error("listener:{0}".format(e))

         finally:

              logger.info("listener:loop ended...")

     '''send message to dest host named destIdent'''

     def sendMsg(self, destIdent, byteseq):

         msg = None

         if self.persistent:

              msg = snakemq.message.Message(byteseq, ttl=60, flags=FLAG_PERSISTENT)

         else:

              msg = snakemq.message.Message(byteseq, ttl=60)

         if self.messaging == None:

              logger.error("listener:messaging is not initialized, send message failed")

              return

         self.messaging.send_message(destIdent, msg)

測試代碼connector（testSnakeConnector.py）：

讀取本地一個(gè)1M的文件，然后發(fā)送給listener，然后listener發(fā)回一個(gè)hello的信息。

from netComm.snakemq import snakemqConnector

import time

import sys

import os

def received(ident, data):

     print(data)

 

if __name__ == "__main__":

     bob = snakemqConnector.SnakemqConnector('bob',"10.16.5.45",4002,True)

     bob.on_recv.add(received)

     bob.start()

     try:

         with open("testfile.txt",encoding='utf-8') as f:

              txt = f.read()

              for i in range(100):

                  bob.sendMsg("niess",txt.encode('utf-8'))

                  time.sleep(0.1)

     except Exception as e:

         print(e)

     time.sleep(5)

     bob.terminate()   

 

測試代碼listener（testSnakeListener.py）：

from netComm.snakemq import snakemqListener

import time

 

def received(ident, data):

     filename = "log/recFile{0}.txt".format(time.strftime('%S',time.localtime()))

     file = open(filename,'w')

     file.writelines(data)

     file.close()

 

if __name__ == "__main__":

     niess = snakemqListener.SnakemqListener("niess","10.16.5.45",4002)

     niess.on_recv.add(received)

     niess.start()

     print("niess start...")

     time.sleep(60)

     niess.terminate()  

     print("niess end...")

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