具有套接字的TCP客户端/服务器,服务器向客户端发送文件,客户端挂起,Python [英] TCP client/server with sockets, server sending files to clients, client hangs, Python
问题描述
服务器是使用select的多客户端,但是这里没有问题。我认为问题是发送图像。
我希望协议在这里变得非常简单。
服务器客户端
GET
<----------------
图片
----------- ------>
通讯结束
所以客户端只能发送GET服务器在获得GET字符串后,应立即将整个图像发送给客户端。就这样,沟通结束了。
$ b
server.py
#!/ usr / bin / env python
import random
导入套接字,从时间选择
gmtime,strftime
image ='image.png'
HOST ='127.0.0.1'
PORT = 6666
connected_clients_sockets = []
server_socket = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
server_socket.bind((HOST,PORT))
server_socket.listen(10)
connected_clients_sockets.append(server_socket)
而True:
read_sockets,write_sockets,error_sockets = select .select(connected_clients_sockets,[],[])
用于read_sockets中的sock:
如果sock == server_socket:
sockfd,client_address = server_socket.accept()
connected_clients_sockets.append(sockfd)
el se:
try:
data = sock.recv(4096)
bytes = open(image).read()
如果数据:
sock .send(字节)
除外:
sock.close()
connected_clients_sockets.remove(sock)
继续
server_socket.close ()
client.py
#!/ usr / bin / env python
导入套接字
导入sys
HOST = '127.0.0.1'
PORT = 6666
sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server_address =(HOST,PORT)
sock .connect(server_address)
尝试:
sock.sendall(GET)
而真:
myfile = open('imagefromserv.png','w')
而真:
data = sock.recv(4096)
如果不是数据:
break
myfile.write(data)
myfile.close()
finally:
sock.close()
我在最新的Ubuntu上使用Python 2.7。
-------------------------------- -------------------------------------------------- -------------------------------------------------- b 似乎一切正常,但在映像传输之后,我的CPU 100%忙 服务器的输出: 客户输出: 表示客户端成功接收到映像。现在好吗?我的意思是,我从服务器上得到了映像,但是我不知道,如果我正确地实现了协议。也许在这里可以改进一些东西? client.py: server.py: 或者我应该这样做: 而不是: 在客户端? 编辑部分下方的代码对我来说似乎很好。 为此,您可以阅读TCP / IP和Linux协议实现这是一个伟大的书这样的事情。 另一方面,你可以坚持的基础,并继续使用TCP套接字,我谦卑的建议是你为客户端实现了一些机制来知道它是否有完整的信息,比如: I want to write a simple TCP server using sockets in Python. The server should send the image to the connected client. The client should receive the image. But, for now on, the client receives only the portion of the image, and I can't even open it. Server is multi-client using select, but its not the problem here. I think that the problem is with sending image. I wanted "the protocol" to be very simple here. So the client can only send the "GET" message to server, and the server, after getting the "GET" string, should immediately send the whole image to client. That's it, communication is over. server.py client.py I'm using Python 2.7 on newest Ubuntu. ------------------------------------------------------------------------------------------------------------------------------------
EDIT
------------------------------------------------------------------------------------------------------------------------------------ Following advices given by one of the users in comments, I TRIED to implement a simple protocol: Everything seems to work, but after the image transfer, my CPU is 100% busy, as Server's output: Client's output: Indicates that the client received the image successfully. Is it ok now? I mean, I got the image from server, but I do not know, if I implemented the protocol correctly. Maybe something can be improved here? client.py: server.py: Or maybe I should rather do: instead of: in client? The code below the EDIT section seems good to me.
I completely agree with @David Schwartz. If you're looking to implement a protocol you have to take into consideration a whole lot of things regarding the protocol design. Ex: For that you can read "TCP/IP and Linux Protocol Implementation" it is a great book for such matter. In the other hand, you can stick with the basics and continue using TCP sockets,my humble suggestion is that you implement some mechanism for the client to know if it has the complete information, like: 这篇关于具有套接字的TCP客户端/服务器,服务器向客户端发送文件,客户端挂起,Python的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
编辑
--------------------------- -------------------------------------------------- --------------------------------------------------按照用户在评论中给出的建议,我试图实现一个简单的协议:
客户端服务器
GET \r\ $
---------------- ------------------->
OK\r\\\
<--------------------------------- -
GET_SIZE \r\\\
--------------------------------- - >
SIZE 1024 \r\\\
<-------------------------------- ---
GET_IMG\r\\\
-------------------------------- --->
IMG_DATA \r\r
<--------------------------------- -
top
说。而且...
- GET -
--GET_SIZE--
--24518--
--GET_IMG--
- OK--
--SIZE 24518--
--24518--
4096
8192
12288
16384
20480
24523
图片收到成功
#!/ usr / bin / env python
导入套接字
导入sys
HOST ='127.0.0.1'
PORT = 6666
sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server_address =(HOST,PORT)
sock.connect(server_address)
fname ='fromserver.png '
尝试:
sock.sendall(GET \r\\\
)
data = sock.recv(4096)
if data:
txt = data.strip()
print' - %s--'%txt
if txt =='OK':
sock.sendall(GET_SIZE \r\\\
)
data = sock.recv(4096)
如果数据:
txt =数据.strip()
print' - %s--'%txt
如果txt.startswith('SIZE'):
tmp = txt.split ()
size = int(tmp [1])$ b
$ b print' - %s--'%size
sock.sendall(GET_IMG\r\\\
)
$ b $ myfile = open(fname,'wb')
amount_received = 0
while amount_received<大小:
data = sock.recv(4096)
如果不是数据:
break
amount_received + = len(data)
print amount_received
$ b如果str(txt)中的'EOF':
print'成功接收图像'
$ .write(data)
myfile.close()
else:
myfile.write(data)
finally:
sock.close()
#!/ usr / bin / env python
import random
导入套接字,从时间选择
gmtime,strftime
image ='tux.png'
HOST ='127.0.0.1'
PORT = 6666
connected_clients _sockets = []
server_socket = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
server_socket.bind((HOST,PORT))
server_socket.listen(10)
connected_clients_sockets.append(server_socket)
True:
read_sockets中的袜子的read_sockets,write_sockets,error_sockets = select.select(connected_clients_sockets,[],[])
如果sock,则为
$ b server_socket:
$ b $ s b
$ s
$ .recv(4096)
如果数据:
txt = data.strip()
print' - %s - '%txt
if txt =='GET':
sock.sendall('OK \r\\\
')
elif txt =='GET_SIZE':
with open('tux.png','rb')as f1:
file_size = len(f1.read())
f1.seek(0)
print' - %s - '%file_size
file_size ='%s'%file_size
sock.sendall(' SIZE%s \r\\\
'file_size)
elif txt =='GET_IMG':
打开(image,'rb')为fp:
image_data = fp.read()
msg ='%sEOF \r\r'%image_data
sock.sendall(msg)
print msg
除外:
sock.close()
connected_clients_sockets.remove(sock)
continue
server_socket.close()
sock.sendall(image_data)
sock .sendall('EOF \r\\\
')
msg ='%sEOF\r\\\
'%image_data
sock.sendall(msg)
我完全同意@David Schwartz。如果你想实现一个协议,你必须考虑到有关协议设计的很多事情。例如:
$ b
$ b
SERVER CLIENT
GET
<----------------
IMAGE
----------------->
END OF COMMUNICATION
#!/usr/bin/env python
import random
import socket, select
from time import gmtime, strftime
image = 'image.png'
HOST = '127.0.0.1'
PORT = 6666
connected_clients_sockets = []
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind((HOST, PORT))
server_socket.listen(10)
connected_clients_sockets.append(server_socket)
while True:
read_sockets, write_sockets, error_sockets = select.select(connected_clients_sockets, [], [])
for sock in read_sockets:
if sock == server_socket:
sockfd, client_address = server_socket.accept()
connected_clients_sockets.append(sockfd)
else:
try:
data = sock.recv(4096)
bytes = open(image).read()
if data:
sock.send(bytes)
except:
sock.close()
connected_clients_sockets.remove(sock)
continue
server_socket.close()
#!/usr/bin/env python
import socket
import sys
HOST = '127.0.0.1'
PORT = 6666
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_address = (HOST, PORT)
sock.connect(server_address)
try:
sock.sendall("GET")
while True:
myfile = open('imagefromserv.png', 'w')
while True:
data = sock.recv(4096)
if not data:
break
myfile.write(data)
myfile.close()
finally:
sock.close()
CLIENT SERVER
GET\r\n
----------------------------------->
OK\r\n
<-----------------------------------
GET_SIZE\r\n
----------------------------------->
SIZE 1024\r\n
<-----------------------------------
GET_IMG\r\n
----------------------------------->
IMG_DATA\r\r
<-----------------------------------
top
says. And ....--GET--
--GET_SIZE--
--24518--
--GET_IMG--
--OK--
--SIZE 24518--
--24518--
4096
8192
12288
16384
20480
24523
Image received successfully
#!/usr/bin/env python
import socket
import sys
HOST = '127.0.0.1'
PORT = 6666
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_address = (HOST, PORT)
sock.connect(server_address)
fname = 'fromserver.png'
try:
sock.sendall("GET\r\n")
data = sock.recv(4096)
if data:
txt = data.strip()
print '--%s--' % txt
if txt == 'OK':
sock.sendall("GET_SIZE\r\n")
data = sock.recv(4096)
if data:
txt = data.strip()
print '--%s--' % txt
if txt.startswith('SIZE'):
tmp = txt.split()
size = int(tmp[1])
print '--%s--' % size
sock.sendall("GET_IMG\r\n")
myfile = open(fname, 'wb')
amount_received = 0
while amount_received < size:
data = sock.recv(4096)
if not data :
break
amount_received += len(data)
print amount_received
txt = data.strip('\r\n')
if 'EOF' in str(txt) :
print 'Image received successfully'
myfile.write(data)
myfile.close()
else :
myfile.write(data)
finally:
sock.close()
#!/usr/bin/env python
import random
import socket, select
from time import gmtime, strftime
image = 'tux.png'
HOST = '127.0.0.1'
PORT = 6666
connected_clients_sockets = []
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind((HOST, PORT))
server_socket.listen(10)
connected_clients_sockets.append(server_socket)
while True:
read_sockets, write_sockets, error_sockets = select.select(connected_clients_sockets, [], [])
for sock in read_sockets:
if sock == server_socket:
sockfd, client_address = server_socket.accept()
connected_clients_sockets.append(sockfd)
else:
try:
data = sock.recv(4096)
if data :
txt = data.strip()
print '--%s--'%txt
if txt == 'GET' :
sock.sendall('OK\r\n')
elif txt == 'GET_SIZE' :
with open ('tux.png','rb') as f1:
file_size = len(f1.read())
f1.seek(0)
print '--%s--'%file_size
file_size = '%s' % file_size
sock.sendall('SIZE %s\r\n' % file_size)
elif txt == 'GET_IMG' :
with open(image, 'rb') as fp:
image_data = fp.read()
msg = '%sEOF\r\r' % image_data
sock.sendall(msg)
print msg
except:
sock.close()
connected_clients_sockets.remove(sock)
continue
server_socket.close()
sock.sendall(image_data)
sock.sendall('EOF\r\n')
msg = '%sEOF\r\n' % image_data
sock.sendall(msg)