code: def handle(self):
      try:
          chan = self.ssh_transport.open_channel(
              "direct-tcpip",
              (self.chain_host, self.chain_port),
              self.request.getpeername(),
          )
      except Exception as e:
          logger.debug(
              "Incoming request to %s:%d failed: %s"
              % (self.chain_host, self.chain_port, repr(e))
          )
          return
      if chan is None:
          logger.debug(
              "Incoming request to %s:%d was rejected by the SSH server."
              % (self.chain_host, self.chain_port)
          )
          return
  
      logger.debug(
          "Connected!  Tunnel open %r -> %r -> %r"
          % (
              self.request.getpeername(),
              chan.getpeername(),
              (self.chain_host, self.chain_port),
          )
      )
      while True:
          r, w, x = select.select([self.request, chan], [], [])
          if self.request in r:
              data = self.request.recv(1024)
              if len(data) == 0:
                  break
              chan.send(data)
          if chan in r:
              data = chan.recv(1024)
              if len(data) == 0:
                  break
              self.request.send(data)
      chan.close()
      self.request.close()
      logger.debug("Tunnel closed ")
  
file_path: catboost/contrib/python/pyzmq/py2/zmq/ssh/forward.py
imports: from __future__ import print_function
  import logging
  import select
label_desc: Use image node_id 1 for calling the Handler obj's underlying member method code with example usage: obj.handle() without return types