socketserver 實現並發

基於tcp的套接字，關鍵就是兩個循環，一個鏈接循環，一個通信循環

socketserver模塊中分兩大類：server類（解決鏈接問題）和request類（解決通信問題）

server類：

request類：

繼承關系:

查找屬性的順序：ThreadingTCPServer->ThreadingMixIn->TCPServer->BaseServer

1. 實例化得到ftpserver，先找類ThreadingTCPServer的__init__,在TCPServer中找到，進而執行server_bind,server_active
2. 找ftpserver下的serve_forever,在BaseServer中找到，進而執行self._handle_request_noblock()，該方法同樣是在BaseServer中
3. 執行self._handle_request_noblock()進而執行request, client_address = self.get_request()（就是TCPServer中的self.socket.accept()），然后執行self.process_request(request, client_address)
4. 在ThreadingMixIn中找到process_request，開啟多線程應對並發，進而執行process_request_thread，執行self.finish_request(request, client_address)
5. 上述四部分完成了鏈接循環，本部分開始進入處理通訊部分，在BaseServer中找到finish_request,觸發我們自己定義的類的實例化，去找__init__方法，而我們自己定義的類沒有該方法，則去它的父類也就是BaseRequestHandler中

源碼分析總結：

基於tcp的socketserver我們自己定義的類中的

1. 　　self.server即套接字對象
2. 　　self.request即一個鏈接
3. 　　self.client_address即客戶端地址

基於udp的socketserver我們自己定義的類中的

1. 　　self.request是一個元組（第一個元素是客戶端發來的數據，第二部分是服務端的udp套接字對象），如(b'adsf', <socket.socket fd=200, family=AddressFamily.AF_INET, type=SocketKind.SOCK_DGRAM, proto=0, laddr=('127.0.0.1', 8080)>)
2. 　　self.client_address即客戶端地址

 

import socketserver
import struct
import json
import os
class FtpServer(socketserver.BaseRequestHandler):
    coding='utf-8'
    server_dir='file_upload'
    max_packet_size=1024
    BASE_DIR=os.path.dirname(os.path.abspath(__file__))
    def handle(self):
        print(self.request)
        while True:
            data=self.request.recv(4)
            data_len=struct.unpack('i',data)[0]
            head_json=self.request.recv(data_len).decode(self.coding)
            head_dic=json.loads(head_json)
            # print(head_dic)
            cmd=head_dic['cmd']
            if hasattr(self,cmd):
                func=getattr(self,cmd)
                func(head_dic)
    def put(self,args):
        file_path = os.path.normpath(os.path.join(
            self.BASE_DIR,
            self.server_dir,
            args['filename']
        ))

        filesize = args['filesize']
        recv_size = 0
        print('----->', file_path)
        with open(file_path, 'wb') as f:
            while recv_size < filesize:
                recv_data = self.request.recv(self.max_packet_size)
                f.write(recv_data)
                recv_size += len(recv_data)
                print('recvsize:%s filesize:%s' % (recv_size, filesize))


ftpserver=socketserver.ThreadingTCPServer(('127.0.0.1',8080),FtpServer)
ftpserver.serve_forever()

FtpServer

import socket
import struct
import json
import os



class MYTCPClient:
    address_family = socket.AF_INET

    socket_type = socket.SOCK_STREAM

    allow_reuse_address = False

    max_packet_size = 8192

    coding='utf-8'

    request_queue_size = 5

    def __init__(self, server_address, connect=True):
        self.server_address=server_address
        self.socket = socket.socket(self.address_family,
                                    self.socket_type)
        if connect:
            try:
                self.client_connect()
            except:
                self.client_close()
                raise

    def client_connect(self):
        self.socket.connect(self.server_address)

    def client_close(self):
        self.socket.close()

    def run(self):
        while True:
            inp=input(">>: ").strip()
            if not inp:continue
            l=inp.split()
            cmd=l[0]
            if hasattr(self,cmd):
                func=getattr(self,cmd)
                func(l)


    def put(self,args):
        cmd=args[0]
        filename=args[1]
        if not os.path.isfile(filename):
            print('file:%s is not exists' %filename)
            return
        else:
            filesize=os.path.getsize(filename)

        head_dic={'cmd':cmd,'filename':os.path.basename(filename),'filesize':filesize}
        print(head_dic)
        head_json=json.dumps(head_dic)
        head_json_bytes=bytes(head_json,encoding=self.coding)

        head_struct=struct.pack('i',len(head_json_bytes))
        self.socket.send(head_struct)
        self.socket.send(head_json_bytes)
        send_size=0
        with open(filename,'rb') as f:
            for line in f:
                self.socket.send(line)
                send_size+=len(line)
                print(send_size)
            else:
                print('upload successful')




client=MYTCPClient(('127.0.0.1',8080))

client.run()

FtpClient