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#coding=utf8
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'''
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服务器端 udp协议 方法：
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1.通过多线程实现停等协议来进行可靠传输，
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2.通过压缩、分块实现文件的快速重传
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'''
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import socket
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import os
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import hashlib
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from os.path import basename
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from threading import Thread,Event
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from time import sleep
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import gzip
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#-------------------------------配置--------------------------------------------
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#------------------------------config--------------------------------------------
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ip='192.168.230.143' #client的ip
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port=7777 #client的port
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BUFFER_SIZE= 32*1024 #32Kb进行分块处理
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fn_path='output.bin' #原始文件名
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fn_path_zip=fn_path+".gz"#压缩文件的文件名称
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port_ack=7778
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address=(ip,port)
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#------------------------------中间文件-------------------------------------------
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positions=[] #存放每块数据在文件中的起点
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file_name=[f'{basename(fn_path)}'.encode("utf-8")]
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#------------------------------大文件压缩-------------------------------------------
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BufSize = 1024*16
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def gZipFile(src, dst):
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fin = open(src, 'rb')
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fout = gzip.open(dst, 'wb')
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in2out(fin, fout)
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def gunZipFile(gzFile, dst):
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fin = gzip.open(gzFile, 'rb')
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fout = open(dst, 'wb')
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in2out(fin, fout)
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def in2out(fin, fout):
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while True:
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buf = fin.read(BufSize)
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if len(buf) < 1:
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break
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fout.write(buf)
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fin.close()
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fout.close() #关闭文件
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#------------------------------发送函数-------------------------------------------
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def sendto(fn_path): #用来发送文件的线程函数
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#首先对文件进行压缩
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#gZipFile(fn_path,fn_path_zip)
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#读取压缩文件全部内容
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with open(fn_path,'rb') as fp:
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content=fp.read()
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#获取文件大小，做好分块传输
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fn_size=len(content)
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for start in range(fn_size//BUFFER_SIZE+1):
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positions.append(start*BUFFER_SIZE)
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#设置事件，启动用来接收确认信息的线程
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e.set()
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#创建窗口套接字，设置发送缓冲区大下
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sock=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
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sock.setsockopt(socket.SOL_SOCKET,socket.SO_SNDBUF,BUFFER_SIZE)
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#发送文件数据，直到所有分块都收到确认，否则就不停地发送
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while positions:
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for pos in positions:
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sock.sendto(f'{pos}_'.encode()+content[pos:pos+BUFFER_SIZE],address)
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print(len(positions))
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#通知其发送成功
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while file_name:
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sock.sendto(b'over_'+file_name[0],address)
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#关闭套接字
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sock.close()
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def recv_ack(): #用来接收确认信息的线程函数
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#创建套接字，绑定本地端口，用来接收对方的确认信息
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sock=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
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sock.bind(('',port_ack))
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#如果所有分块都确认过，结束循环
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while positions:
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#预期收到的确认包格式为1234_ack
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data,_=sock.recvfrom(1024)
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pos =int(data.split(b'_')[0])
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if pos in positions:
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positions.remove(pos)
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#确认对方收到文件名，并已接收全部数据
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while file_name:
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data,_=sock.recvfrom(1024)
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fn=data.split(b'_')[0]
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if fn in file_name:
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file_name.remove(fn)
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#关闭套接字
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sock.close()
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t1=Thread(target=sendto,args=(fn_path,))
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t1.start()
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e=Event()
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e.clear()
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e.wait()
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t2=Thread(target=recv_ack)
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t2.start()
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#等待发送线程和接收确认线程都结束
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t2.join()
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t1.join()
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