#!/usr/bin/env python3
"""
測試socket-stream 重定向模式
"""
import sys,os,time
from multiprocessing import Process
from socket import *
 
def initListenerSocket(port=50008,host=''):
    """ 
    初始化在服務器模式下調用者用于監聽連接的套接字
    """
    sock=socket()
    try:
        sock.bind((host,port))
    except OSError as e:
        print('Address already in use')
        os._exit(1)
    sock.listen(5)
    conn,addr=sock.accept()
    return conn
 
def redirecOut(port=50008,host='localhost'):
    """ 
    在接受之前其他連接都失敗，連接調用者標準輸出流
    到一個套接字，這個套接字用于gui監聽,在收聽者啟動后，啟動調用者
    """
    sock=socket()
    try:
        sock.connect((host,port))
    except ConnectionRefusedError as e:
        print('connection refuse')
        os._exit(1)
    file=sock.makefile('w')
    sys.stdout=file
    return sock
 
def redirecIn(port=50008,host='localhost'):
    """ 
    連接調用者標準輸入流到用于gui來提供的套接字
    """
    sock=socket()
    try:
        sock.connect((host,port))
    except ConnectionRefusedError as e:
        print('conenction refuse')
        os._exit(1)
    file=sock.makefile('r')
    sys.stdin=file
    return sock
 
def redirecBothAsClient(port=50008,host='localhost'):
    """
    在這種模式下，連接調用者標準輸入和輸出流到相同的套接字
    調用者對于服務器來說就是客戶端:發送消息，接受響應答復
    """
    sock=socket()
    try:
        sock.connect((host,port))
    except ConnectionRefusedError as e:
        print('connection refuse')
        os._exit(1)
    ofile=sock.makefile('w')
    ifile=sock.makefile('r')
    sys.stdout=ofile
    sys.stdin=ifile
    return sock
 
def redirecBothAsServer(port=50008,host='localhost'):
    """
    在這種模式下，連接調用者標準輸入和輸出流到相同的套接字，調用者對于
    服務器來說就是服務端：接受消息，發送響應答復
    """
    sock=socket()
    try:
        sock.bind((host,port))
    except OSError as e:
        print('Address already in use')
        os._exit(1)
    sock.listen(5)
    conn,addr=sock.accept()
    ofile=conn.makefile('w')
    ifile=conn.makefile('r')
    sys.stdout=ofile
    sys.stdin=ifile
    return conn
 
def server1():
    mypid=os.getpid()
    conn=initListenerSocket()
    file=conn.makefile('r')
    for i in range(3):
        data=file.readline().rstrip()
        print('server %s got [%s]' %(mypid,data))
 
def client1():
    time.sleep(1)
    mypid=os.getpid()
    redirecOut()
    for i in range(3):
        print('client: %s:%s' % (mypid,i))
        sys.stdout.flush()
 
def server2():
    mypid=os.getpid()
    conn=initListenerSocket()
    for i in range(3):
        conn.send(('server %s got [%s]\n' %(mypid,i)).encode())
 
def client2():
    time.sleep(1)
    mypid=os.getpid()
    redirecIn()
    for i in range(3):
        data=input()
        print('client %s got [%s]]'%(mypid,data))
 
def server3():
    mypid=os.getpid()
    conn=initListenerSocket()
    file=conn.makefile('r')
    for i in range(3):
        data=file.readline().rstrip()
        conn.send(('server %s got [%s]\n' % (mypid,data)).encode())
 
def client3():
    time.sleep(1)
    mypid=os.getpid()
    redirecBothAsClient()
    for i in range(3):
        print('Client %s: %s' %(mypid,data))
        data=input()
        sys.stderr.write('client %s got [%s]\n' %(mypid,data))
 
def server4(port=50008,host='localhost'):
    mypid=os.getpid()
    sock=socket()
    try:
        sock.connect((host,port))
    ConnectionRefusedError as e:
        print('connection refuse')
        os._exit(1)
    file=sock.makefile('r')
    for i in range(3):
        sock.send(('server %s: %S\n' %(mypid,i)).encode())
        data=file.readline().rstrip()
        print('server %s got [%s]' %(mypid,data))
 
def client4():
    time.sleep(1)
    mypid=os.getpid()
    redirecBothAsServer()
    for i in range(3):
        data=input()
        print('client %s got [%s]'%(mypid,data))
        sys.stdout.flush()
 
def server5():
    mypid=os.getpid()
    conn=initListenerSocket()
    file=conn.makefile('r')
    for i in range(3):
        conn.send(('server %s:%s\n' %(mypid,i)).encode())
        data=file.readline().rstrip()
        print('server %s got [%s]' % (mypid,data))
 
def client5():
    mypid=os.getpid()
    s=redirecBothAsClient()
    for i in range(3):
        data=input()
        print('client %s got [%s]'%(mypid,data))
        sys.stdout.flush()
 
def main():
    server=eval('server'+sys.argv[1])
    client=eval('client'+sys.argv[1])
    Process(target=server).start()
    client()
 
if __name__=='__main__':
    main()