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14b8c0476f
In `MatrixFederationHttpClient._send_request()`, we make a HTTP request using an `Agent`, wrap that request in a timeout and await the resulting `Deferred`. On its own, the `Agent` performing the HTTP request correctly stashes and restores the logging context while waiting. The addition of the timeout introduces a path where the logging context is not restored when execution resumes. To address this, we wrap the timeout `Deferred` in a `make_deferred_yieldable()` to stash the logging context and restore it on completion of the `await`. However this is not sufficient, since by the time we construct the timeout `Deferred`, the `Agent` has already stashed and cleared the logging context when using `make_deferred_yieldable()` to produce its `Deferred` for the request. Hence, we wrap the `Agent` request in a `run_in_background()` to "fork" and preserve the logging context so that we can stash and restore it when `await`ing the timeout `Deferred`. This approach is similar to the one used with `defer.gatherResults`. Note that the code is still not fully correct. When a timeout occurs, the request remains running in the background (existing behavior which is nothing to do with the new call to `run_in_background`) and may re-start the logging context after it has finished. |
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| .. | ||
| _scripts | ||
| api | ||
| app | ||
| appservice | ||
| config | ||
| crypto | ||
| events | ||
| federation | ||
| groups | ||
| handlers | ||
| http | ||
| logging | ||
| metrics | ||
| module_api | ||
| push | ||
| replication | ||
| res | ||
| rest | ||
| server_notices | ||
| spam_checker_api | ||
| state | ||
| static | ||
| storage | ||
| streams | ||
| util | ||
| __init__.py | ||
| event_auth.py | ||
| notifier.py | ||
| python_dependencies.py | ||
| server.py | ||
| types.py | ||
| visibility.py | ||