python socket recv方法
Port=2222 #assume a socket disconnect (data returned is empty string) meansall data was #done being sent.def recv_basic(the_socket):
total_data=[]
while True:
data = the_socket.recv(8192)
if not data: break
total_data.append(data)
return ''.join(total_data)
def recv_timeout(the_socket,timeout=2):
the_socket.setblocking(0)
total_data=[];data='';begin=time.time()
while 1:
#if you got some data, then break after wait sec
if total_data and time.time()-begin>timeout:
break
#if you got no data at all, wait a little longer
elif time.time()-begin>timeout*2:
break
try:
data=the_socket.recv(8192)
if data:
total_data.append(data)
begin=time.time()
else:
time.sleep(0.1)
except:
pass
return ''.join(total_data)
End='something useable as an end marker'
def recv_end(the_socket):
total_data=[];data=''
while True:
data=the_socket.recv(8192)
if End in data:
total_data.append(data[:data.find(End)])
break
total_data.append(data)
if len(total_data)>1:
#check if end_of_data was split
last_pair=total_data[-2]+total_data[-1]
if End in last_pair:
total_data[-2]=last_pair[:last_pair.find(End)]
total_data.pop()
break
return ''.join(total_data)
def recv_size(the_socket):
#data length is packed into 4 bytes
total_len=0;total_data=[];size=sys.maxint
> while total_len<size:
sock_data=the_socket.recv(recv_size)
if not total_data:
if len(sock_data)>4:
>
> recv_size=size
if recv_size>524288:recv_size=524288
total_data.append(size_data)
else:
> else:
total_data.append(sock_data)
total_len=sum()
return ''.join(total_data)
##############
def start_server(recv_type=''):
sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.bind(('',Port))
sock.listen(5)
print 'started on',Port
while True:
newsock,address=sock.accept()
print 'connected'
if recv_type=='size': result=recv_size(newsock)
elif recv_type=='end': result=recv_end(newsock)
elif recv_type=='timeout': result=recv_timeout(newsock)
else: result=newsock.recv(8192)
print 'got',result
if __name__=='__main__':
#start_server()
#start_server(recv_type='size')
#start_server(recv_type='timeout')
start_server(recv_type='end')
def send_size(data):
sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.connect(('localhost',Port))
sock.sendall(struct.pack('>i', len(data))+data)
sock.close()
def send_end(data):
sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.connect(('localhost',Port))
sock.sendall(data+End)
sock.close()
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