Strange re-connection problem with python-bitcoinrpc

0

I am using https://github.com/jgarzik/python-bitcoinrpc to access the bitcoin core rpc. I have found a very strange re-connection problem.

from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException

# rpc_user and rpc_password are set in the bitcoin.conf file
1. rpc_connection = AuthServiceProxy("http://%s:%s@127.0.0.1:8332"%(rpc_user, rpc_password))
2. best_block_hash = rpc_connection.getbestblockhash()
3. print(rpc_connection.getblock(best_block_hash))

The above code runs well in the python interactive window. However, after a while (for instance 10s), when I run the line2 again, it crashs with following info:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/fangjun/.local/lib/python3.5/site-packages/bitcoinrpc/authproxy.py", line 136, in __call__
    'Content-type': 'application/json'})
  File "/usr/lib/python3.5/http/client.py", line 1106, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib/python3.5/http/client.py", line 1151, in _send_request
    self.endheaders(body)
  File "/usr/lib/python3.5/http/client.py", line 1102, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python3.5/http/client.py", line 936, in _send_output
    self.send(message_body)
  File "/usr/lib/python3.5/http/client.py", line 908, in send
    self.sock.sendall(data)
BrokenPipeError: [Errno 32] Broken pipe

if I reconnect the server again by running line1, then line2 runs well.

It seems I need to run line1 from time to time, but it doesn't make sense. Can some tell me the reason? Thanks.

Jun Fang

Posted 2019-07-21T03:41:44.750

Reputation: 3

Answers

0

Both the RPC client and the RPC server have timeouts, if no request or response has been received for X seconds, they will close the connection. By default the timeout is 30 seconds. I believe you are running into the timeout since you wait a while before trying to send another command. By that point, one end has timed out and thus the connection is closed resulting in Broken pipe errors.

Andrew Chow

Posted 2019-07-21T03:41:44.750

Reputation: 40 910

Thanks for your reply. I set the timeout=1200, but it doesn't work for 1200s. I found when I run line1 and line2, then after 60s, I run line2 again, it crashes, even I set the timeout very large. – Jun Fang – 2019-07-21T09:00:18.200

The server has it's own timeout, so even if you increase the timeout on your client, the server will still timeout after 30 seconds. You can change that setting rpcservertimeout=1200 in your bitcoin.conf file and restarting Bitcoin Core. – Andrew Chow – 2019-07-21T16:12:21.373

Yes, your are right. Or I can reconnect the server each time when I send a query. – Jun Fang – 2019-07-22T09:35:06.357

Asked: 2019-07-21T03:41:44.750

Viewed: 56 times

Active: 2019-07-21T03:58:48.710