qa: Account for unset errno in ConnectionResetError #33875

pull hodlinator wants to merge 1 commits into bitcoin:master from hodlinator:2025/11/RemoteDisconnect_err changing 1 files +9 −4
  1. hodlinator commented at 9:10 pm on November 14, 2025: contributor

    The lack of errno can cause unclear and long log output.

    Issue can be triggered by:

    0--- a/src/httpserver.cpp
1+++ b/src/httpserver.cpp
2@@ -263,6 +263,7 @@ std::string RequestMethodString(HTTPRequest::RequestMethod m)
3 /** HTTP request callback */
4 static void http_request_cb(struct evhttp_request* req, void* arg)
5 {
6+    throw std::runtime_error{"Hello"};
7     evhttp_connection* conn{evhttp_request_get_connection(req)};
8     // Track active requests
9     {

    and running a functional test such as test/functional/feature_abortnode.py.

    http.client.RemoteDisconnected not specifying errno to ConnectionResetError-ctor: https://github.com/python/cpython/blob/ce4b0ede16aea62ee7b1e02df7e1538102a356da/Lib/http/client.py#L1556C9-L1556C29

    Log before

     02025-11-14T20:53:05.272804Z TestFramework (ERROR): Unexpected exception
 1Traceback (most recent call last):
 2  File "/home/hodlinator/bc/3/test/functional/test_framework/test_framework.py", line 138, in main
 3    self.setup()
 4    ~~~~~~~~~~^^
 5  File "/home/hodlinator/bc/3/test/functional/test_framework/test_framework.py", line 268, in setup
 6    self.setup_network()
 7    ~~~~~~~~~~~~~~~~~~^^
 8  File "/home/hodlinator/bc/3/./build/test/functional/feature_abortnode.py", line 21, in setup_network
 9    self.setup_nodes()
10    ~~~~~~~~~~~~~~~~^^
11  File "/home/hodlinator/bc/3/test/functional/test_framework/test_framework.py", line 381, in setup_nodes
12    self.start_nodes()
13    ~~~~~~~~~~~~~~~~^^
14  File "/home/hodlinator/bc/3/test/functional/test_framework/test_framework.py", line 527, in start_nodes
15    node.wait_for_rpc_connection()
16    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
17  File "/home/hodlinator/bc/3/test/functional/test_framework/test_node.py", line 326, in wait_for_rpc_connection
18    rpc.getblockcount()
19    ~~~~~~~~~~~~~~~~~^^
20  File "/home/hodlinator/bc/3/test/functional/test_framework/coverage.py", line 50, in __call__
21    return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
22  File "/home/hodlinator/bc/3/test/functional/test_framework/authproxy.py", line 137, in __call__
23    response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
24                       ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
25  File "/home/hodlinator/bc/3/test/functional/test_framework/authproxy.py", line 111, in _request
26    return self._get_response()
27           ~~~~~~~~~~~~~~~~~~^^
28  File "/home/hodlinator/bc/3/test/functional/test_framework/authproxy.py", line 174, in _get_response
29    http_response = self.__conn.getresponse()
30  File "/nix/store/62fdlzq1x1ak2lsxp4ij7ip5k9nia3hc-python3-3.13.7/lib/python3.13/http/client.py", line 1430, in getresponse
31    response.begin()
32    ~~~~~~~~~~~~~~^^
33  File "/nix/store/62fdlzq1x1ak2lsxp4ij7ip5k9nia3hc-python3-3.13.7/lib/python3.13/http/client.py", line 331, in begin
34    version, status, reason = self._read_status()
35                              ~~~~~~~~~~~~~~~~~^^
36  File "/nix/store/62fdlzq1x1ak2lsxp4ij7ip5k9nia3hc-python3-3.13.7/lib/python3.13/http/client.py", line 300, in _read_status
37    raise RemoteDisconnected("Remote end closed connection without"
38                             " response")
39http.client.RemoteDisconnected: Remote end closed connection without response

    Log after

     02025-11-14T20:48:10.552126Z TestFramework (ERROR): Unexpected exception
 1Traceback (most recent call last):
 2  File "/home/hodlinator/bc/3/test/functional/test_framework/test_framework.py", line 138, in main
 3    self.setup()
 4    ~~~~~~~~~~^^
 5  File "/home/hodlinator/bc/3/test/functional/test_framework/test_framework.py", line 268, in setup
 6    self.setup_network()
 7    ~~~~~~~~~~~~~~~~~~^^
 8  File "/home/hodlinator/bc/3/./build/test/functional/feature_abortnode.py", line 21, in setup_network
 9    self.setup_nodes()
10    ~~~~~~~~~~~~~~~~^^
11  File "/home/hodlinator/bc/3/test/functional/test_framework/test_framework.py", line 381, in setup_nodes
12    self.start_nodes()
13    ~~~~~~~~~~~~~~~~^^
14  File "/home/hodlinator/bc/3/test/functional/test_framework/test_framework.py", line 527, in start_nodes
15    node.wait_for_rpc_connection()
16    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
17  File "/home/hodlinator/bc/3/test/functional/test_framework/test_node.py", line 316, in wait_for_rpc_connection
18    raise FailedToStartError(self._node_msg(
19        f'bitcoind exited with status {self.process.returncode} during initialization. {str_error}'))
20test_framework.test_node.FailedToStartError: [node 0] bitcoind exited with status -6 during initialization. terminate called after throwing an instance of 'std::runtime_error'
21  what():  Hello
22************************

    Note how even the C++ exception message is now included.

  2. qa: Account for errno not always being set for ConnectionResetError 
    Logging issue can be triggered by:

```diff
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -263,6 +263,7 @@ std::string RequestMethodString(HTTPRequest::RequestMethod m)
 /** HTTP request callback */
 static void http_request_cb(struct evhttp_request* req, void* arg)
 {
+    throw std::runtime_error{"Hello"};
     evhttp_connection* conn{evhttp_request_get_connection(req)};
     // Track active requests
     {
```

http.client.RemoteDisconnected not specifying errno to ConnectionResetError-ctor:
https://github.com/python/cpython/blob/ce4b0ede16aea62ee7b1e02df7e1538102a356da/Lib/http/client.py#L1556C9-L1556C29
    76e0e6087d
  3. DrahtBot added the label Tests on Nov 14, 2025
  4. DrahtBot commented at 9:10 pm on November 14, 2025: contributor

    The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

    Code Coverage & Benchmarks

    For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33875.

    Reviews

    See the guideline for information on the review process.

    Type Reviewers
    ACK furszy, l0rinc

    If your review is incorrectly listed, please react with 👎 to this comment and the bot will ignore it on the next update.

    LLM Linter (✨ experimental)

    Possible typos and grammar issues:

    • Work around issue where socket timeouts don’t have errno set. -> Work around an issue where socket timeouts don’t have errno set. [missing article “an” makes the sentence slightly ungrammatical]

    drahtbot_id_5_m

  5. in test/functional/test_framework/test_node.py:374 in 76e0e6087d 
    373+                    if isinstance(e, TimeoutError):
374+                        error_num = errno.ETIMEDOUT
375+                    # http.client.RemoteDisconnected inherits from this type and
376+                    # doesn't specify errno.
377+                    elif isinstance(e, ConnectionResetError):
378+                        error_num = errno.ECONNRESET
    furszy commented at 8:43 pm on November 15, 2025:

    nit: might want to update the line below to state this could also happen due to an uncaught exception at the server side. Talking about this:

    0errno.ECONNRESET, # This might happen when the RPC server is in warmup
    hodlinator commented at 1:10 pm on November 17, 2025:

    Will try to come up with something in case I re-touch. (Edit: ->) Something like:

    0errno.ECONNRESET,  # This might happen when the RPC server is in warmup, or throws an exception and disconnects us
  6. furszy commented at 8:55 pm on November 15, 2025: member

    Tested ACK 76e0e6087d0310ec31f43d751de60adf0c0a2faa

    Thanks for improving this. It makes understanding internal issues simpler.

    It’d be nice if the upcoming http server implementation caught these unhandled exceptions, writes to std::cerr and returns a proper error instead of exposing the internal one via the http response. Tagging @pinheadmz.

  7. l0rinc approved
  8. l0rinc commented at 6:16 pm on November 19, 2025: contributor

    untested code review ACK 76e0e6087d0310ec31f43d751de60adf0c0a2faa

    This is a continuation of https://github.com/bitcoin/bitcoin/pull/30660/files#diff-7f22a082e3a80ca2f212e36193f87dd80237035afedb7f15b116ef7fa265f3eeR326, separating the existing TimeoutError to add extra details for ConnectionResetError as well.


hodlinator DrahtBot furszy l0rinc

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