python 通过套接字进行管道子进程 I/O

Question

我知道那里有类似的问题，但我在这个具体的例子中遇到了麻烦，并且还没有找到一个好的答案。我正在尝试为 dar 设置远程备份服务器，沿着这些线< /a>.我问了一个关于通过使用 subprocess.Popen 调用 netcat 来执行此操作的单独的问题，但我更愿意设置如果可能的话，使用 python 进行所有管道连接。将会有几场演出被转移，所以我不能先读取所有的输入，然后再传递。

问题是服务器似乎没有读取数据。

目前，我有以下代码：

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()

当我运行客户端时，我从服务器端得到以下输出：

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

然后它就坐在那里。同时， dar 运行在客户端上，客户端陷入等待服务器响应的状态：

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

服务器上的 dar_xform 命令似乎失败...

尝试向 subprocess.Popen(...) 提供 dar_xform 命令的完整路径，看看是否可以继续有问题。您所描述的内容看起来可疑地像 PATH 问题，特别是因为它在 shell 提示符下工作。