python pipe子进程在套接字上的输入/输出

Question

我知道那里有类似的问题，但是我遇到了这个具体示例的问题，并没有找到一个好的答案。我正在尝试为dar设置一个远程备份服务器，along these lines。我询问了一个separate question关于通过使用subprocess.Popen调用netcat来做到这一点，但我更愿意设置套接字并尽可能使用python执行所有管道。会有几个演出转​​移，所以我不能只是先读取所有的输入，然后传递它。

问题是服务器似乎没有读取数据。

此刻，我有下面的代码：

from socket import socket, AF_INET, SOCK_STREAM 
import sys 
import SocketServer 
import subprocess 

class DarHandler(SocketServer.BaseRequestHandler): 
    def handle(self): 
     print('entering handler') 
     data = self.request.recv(1024).strip() 
     print('got: ' + data) 
     if data == 'xform': 
      s = socket(AF_INET, SOCK_STREAM) 
      s.bind(('',0)) 
      myaddr, myport = s.getsockname() 
      print('bound new socket to {0}:{1}'.format(myaddr, myport)) 
      self.request.send(str(myport)) 
      s.listen(1) 
      conn, remoteaddr = s.accept() 
      print('accepted connection from {0}:{1}'.format(*remoteaddr)) 
      xform_input = conn.makefile('rb',0) 
      proc = subprocess.Popen(
       ['/usr/bin/dar_xform', '-s', '10k', '-', 'archives/sockbackup',], 
       stdin=xform_input 
      ) 
      return_code = proc.wait() 
      print('dar_xform returned {0}'.format(return_code)) 
      conn.close() 
      self.request.send(str(return_code)) 
     else: 
      self.request.send('bad request') 
     print('send result, exiting handler') 

server_address = ('localhost', 18010) 
def server(): 
    server = SocketServer.TCPServer(server_address, DarHandler) 
    print('listening') 
    server.serve_forever() 

def client(): 
    sock = socket(AF_INET, SOCK_STREAM) 
    print('connecting to server') 
    sock.connect(('localhost', 18010)) 
    print('connected, sending request') 
    sock.send('xform') 
    print('waiting for response') 
    port = sock.recv(1024) 
    print('got: ' + port) 
    s = socket(AF_INET, SOCK_STREAM) 
    s.connect(('localhost', int(port))) 
    print('connected to dar_xform port') 
    dar_output = s.makefile('wb',0) 
    return_code = subprocess.call(
      ['/usr/bin/dar', '-B', 'config/test.dcf', '-c', '-',], 
      stdout=dar_output 
    ) 
    print('dar returned {0}'.format(return_code)) 
    s.close() 
    result = sock.recv(1024) 
    print('received: ' + result) 
    sock.close() 
    print('socket closed, exiting') 

if __name__ == "__main__": 
    if sys.argv[1].startswith('serv'): 
     server() 
    else: 
     client() 

我从服务器端输出以下，当我运行客户端：

 
listening 
entering handler 
got: xform 
bound new socket to 0.0.0.0:41658 
accepted connection from 127.0.0.1:42440 

然后，它只是坐在那里。同时，dar客户端和客户端上运行的是停留等待服务器的响应：

 
connecting to server 
connected, sending request 
waiting for response 
got: 41300 
connected to dar_xform port 


-------------------------------------------- 
53 inode(s) saved 
with 0 hard link(s) recorded 
0 inode(s) changed at the moment of the backup 
0 inode(s) not saved (no inode/file change) 
0 inode(s) failed to save (filesystem error) 
1 inode(s) ignored (excluded by filters) 
0 inode(s) recorded as deleted from reference backup 
-------------------------------------------- 
Total number of inodes considered: 54 
-------------------------------------------- 
EA saved for 0 inode(s) 
-------------------------------------------- 
dar returned 0 

Answer 1

它看起来像服务器失败的dar_xform命令

尝试提供dar_xform命令的完整路径至subprocess.Popen(...)并查看是否仍有问题。你所描述的看起来很像PATH问题，特别是因为它在shell提示下工作。