from socket import *
import hmac,os secret_key=b'linhaifeng bang bang bang'
def conn_auth(conn):
'''
认证客户端链接
:param conn:
:return:
'''
print('开始验证新链接的合法性')
msg=os.urandom(32)
conn.sendall(msg)
h=hmac.new(secret_key,msg)
digest=h.digest()
respone=conn.recv(len(digest))
return hmac.compare_digest(respone,digest) def data_handler(conn,bufsize=1024):
if not conn_auth(conn):
print('该链接不合法,关闭')
conn.close()
return
print('链接合法,开始通信')
while True:
data=conn.recv(bufsize)
if not data:break
conn.sendall(data.upper()) def server_handler(ip_port,bufsize,backlog=5):
'''
只处理链接
:param ip_port:
:return:
'''
tcp_socket_server=socket(AF_INET,SOCK_STREAM)
tcp_socket_server.bind(ip_port)
tcp_socket_server.listen(backlog)
while True:
conn,addr=tcp_socket_server.accept()
print('新连接[%s:%s]' %(addr[0],addr[1]))
data_handler(conn,bufsize) if __name__ == '__main__':
ip_port=('127.0.0.1',9999)
bufsize=1024
server_handler(ip_port,bufsize)
服务端
from socket import *
import hmac,os secret_key=b'linhaifeng bang bang bang'
def conn_auth(conn):
'''
验证客户端到服务器的链接
:param conn:
:return:
'''
msg=conn.recv(32)
h=hmac.new(secret_key,msg)
digest=h.digest()
conn.sendall(digest) def client_handler(ip_port,bufsize=1024):
tcp_socket_client=socket(AF_INET,SOCK_STREAM)
tcp_socket_client.connect(ip_port) conn_auth(tcp_socket_client) while True:
data=input('>>: ').strip()
if not data:continue
if data == 'quit':break tcp_socket_client.sendall(data.encode('utf-8'))
respone=tcp_socket_client.recv(bufsize)
print(respone.decode('utf-8'))
tcp_socket_client.close() if __name__ == '__main__':
ip_port=('127.0.0.1',9999)
bufsize=1024
client_handler(ip_port,bufsize)
客户端
基于tcp的套接字，关键就是两个循环，一个链接循环，一个通信循环
socketserver模块中分两大类：server类（解决链接问题）和request类（解决通信问题）
server类：
request类：
查找属性的顺序：ThreadingTCPServer->ThreadingMixIn->TCPServer->BaseServer
- 实例化得到ftpserver，先找类ThreadingTCPServer的__init__,在TCPServer中找到，进而执行server_bind,server_active
- 找ftpserver下的serve_forever,在BaseServer中找到，进而执行self._handle_request_noblock()，该方法同样是在BaseServer中
- 执行self._handle_request_noblock()进而执行request, client_address = self.get_request()（就是TCPServer中的self.socket.accept()），然后执行self.process_request(request, client_address)
- 在ThreadingMixIn中找到process_request，开启多线程应对并发，进而执行process_request_thread，执行self.finish_request(request, client_address)
- 上述四部分完成了链接循环，本部分开始进入处理通讯部分，在BaseServer中找到finish_request,触发我们自己定义的类的实例化，去找__init__方法，而我们自己定义的类没有该方法，则去它的父类也就是BaseRequestHandler中找....
源码分析总结：
基于tcp的socketserver我们自己定义的类中的
- self.server即套接字对象
- self.request即一个链接
- self.client_address即客户端地址
基于udp的socketserver我们自己定义的类中的
- self.request是一个元组（第一个元素是客户端发来的数据，第二部分是服务端的udp套接字对象），如(b'adsf', <socket.socket fd=200, family=AddressFamily.AF_INET, type=SocketKind.SOCK_DGRAM, proto=0, laddr=('127.0.0.1', 8080)>)
- self.client_address即客户端地址
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