Introduce `Clock.call_when_running(...)` to wrap startup code in a
logcontext, ensuring we can identify which server generated the logs.
Background:
> Ideally, nothing from the Synapse homeserver would be logged against the `sentinel`
> logcontext as we want to know which server the logs came from. In practice, this is not
> always the case yet especially outside of request handling.
>
> Global things outside of Synapse (e.g. Twisted reactor code) should run in the
> `sentinel` logcontext. It's only when it calls into application code that a logcontext
> gets activated. This means the reactor should be started in the `sentinel` logcontext,
> and any time an awaitable yields control back to the reactor, it should reset the
> logcontext to be the `sentinel` logcontext. This is important to avoid leaking the
> current logcontext to the reactor (which would then get picked up and associated with
> the next thing the reactor does).
>
> *-- `docs/log_contexts.md`
Also adds a lint to prefer `Clock.call_when_running(...)` over
`reactor.callWhenRunning(...)`
Part of https://github.com/element-hq/synapse/issues/18905
Switch to OpenTracing's `ContextVarsScopeManager` instead of our own
custom `LogContextScopeManager`.
This is now possible because the linked Twisted issue from the comment
in our custom `LogContextScopeManager` is resolved:
https://twistedmatrix.com/trac/ticket/10301
This PR is spawning from exploring different possibilities to solve the
`scope` loss problem I was encountering in
https://github.com/element-hq/synapse/pull/18804#discussion_r2268254424.
This appears to solve the problem and I've added the additional test
from there to this PR ✅
Bulk refactor `Counter` metrics to be homeserver-scoped. We also add
lints to make sure that new `Counter` metrics don't sneak in without
using the `server_name` label (`SERVER_NAME_LABEL`).
All of the "Fill in" commits are just bulk refactor.
Part of https://github.com/element-hq/synapse/issues/18592
### Testing strategy
1. Add the `metrics` listener in your `homeserver.yaml`
```yaml
listeners:
# This is just showing how to configure metrics either way
#
# `http` `metrics` resource
- port: 9322
type: http
bind_addresses: ['127.0.0.1']
resources:
- names: [metrics]
compress: false
# `metrics` listener
- port: 9323
type: metrics
bind_addresses: ['127.0.0.1']
```
1. Start the homeserver: `poetry run synapse_homeserver --config-path
homeserver.yaml`
1. Fetch `http://localhost:9322/_synapse/metrics` and/or
`http://localhost:9323/metrics`
1. Observe response includes the `synapse_user_registrations_total`,
`synapse_http_server_response_count_total`, etc metrics with the
`server_name` label
Spawning from getting `HMAC incorrect` errors that seem unexplainable
except for the `registration_shared_secret` being misconfigured. It's
also possible my HMAC calculation is incorrect but every time I
double-check the result with the [known-good Python
example](553e124f76/docs/admin_api/register_api.md)
(which matches [Synapse's
source](24e849e483/synapse/rest/admin/users.py (L618-L633))),
it's as expected.
With these logs, we can actually debug whether
`registration_shared_secret` is being configured correctly or not.
It also helps specifically when using `registration_shared_secret_path`
since the default Synapse behavior (of creating the file and secret if
it doesn't exist) can mask deployment race condition where we would
start up Synapse before the `registration_shared_secret_path` file was
put in place:
> **`registration_shared_secret_path`**
>
> [...]
>
> If this file does not exist, Synapse will create a new shared secret
on startup and store it in this file.
>
> *-- [Synapse config
docs](6521406a37/docs/usage/configuration/config_documentation.md (registration_shared_secret_path))*
This only applies to the [`POST
/_synapse/admin/v1/register`](553e124f76/docs/admin_api/register_api.md)
endpoint but does log very sensitive information so we've made it so you
have to explicitly enable the logs by configuring
`synapse.rest.admin.users.registration_debug` (does not inherit root log
level) (via our new `ExplicitlyConfiguredLogger`)
`homeserver.yaml`
```yaml
log_config: "/myserver.log.config.yaml"
```
`myserver.log.config.yaml`
```yaml
version: 1
formatters:
precise:
format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s - %(message)s'
handlers:
# ... file/buffer handler (see `sample_log_config.yaml`)
# A handler that writes logs to stderr. Unused by default, but can be used
# instead of "buffer" and "file" in the logger handlers.
console:
class: logging.StreamHandler
formatter: precise
loggers:
synapse.storage.SQL:
# beware: increasing this to DEBUG will make synapse log sensitive
# information such as access tokens.
level: INFO
# Has to be explicitly configured as such. Will not inherit from the root level even if it's set to DEBUG
synapse.rest.admin.users.registration_debug:
level: DEBUG
root:
level: INFO
handlers: [console]
disable_existing_loggers: false
```
This can be reviewed commit by commit.
This enables the `flake8-logging` and `flake8-logging-format` rules in
Ruff, as well as logging exception stack traces in a few places where it
makes sense
- https://docs.astral.sh/ruff/rules/#flake8-logging-log
- https://docs.astral.sh/ruff/rules/#flake8-logging-format-g
### Linting to avoid pre-formatting log messages
See [`adamchainz/flake8-logging` -> *LOG011 avoid pre-formatting log
messages*](152db2f167/README.rst (log011-avoid-pre-formatting-log-messages))
Practically, this means prefer placeholders (`%s`) over f-strings for
logging.
This is because placeholders are passed as args to loggers, so they can
do special handling of them.
For example, Sentry will record the args separately in their logging
integration:
c15b390dfe/sentry_sdk/integrations/logging.py (L280-L284)
One theoretical small perf benefit is that log levels that aren't
enabled won't get formatted, so it doesn't unnecessarily create
formatted strings
During the migration the automated script to update the copyright
headers accidentally got rid of some of the existing copyright lines.
Reinstate them.
* Update mypy and mypy-zope
* Remove unused ignores
These used to suppress
```
synapse/storage/engines/__init__.py:28: error: "__new__" must return a
class instance (got "NoReturn") [misc]
```
and
```
synapse/http/matrixfederationclient.py:1270: error: "BaseException" has no attribute "reasons" [attr-defined]
```
(note that we check `hasattr(e, "reasons")` above)
* Avoid empty body warnings, sometimes by marking methods as abstract
E.g.
```
tests/handlers/test_register.py:58: error: Missing return statement [empty-body]
tests/handlers/test_register.py:108: error: Missing return statement [empty-body]
```
* Suppress false positive about `JaegerConfig`
Complaint was
```
synapse/logging/opentracing.py:450: error: Function "Type[Config]" could always be true in boolean context [truthy-function]
```
* Fix not calling `is_state()`
Oops!
```
tests/rest/client/test_third_party_rules.py:428: error: Function "Callable[[], bool]" could always be true in boolean context [truthy-function]
```
* Suppress false positives from ParamSpecs
````
synapse/logging/opentracing.py:971: error: Argument 2 to "_custom_sync_async_decorator" has incompatible type "Callable[[Arg(Callable[P, R], 'func'), **P], _GeneratorContextManager[None]]"; expected "Callable[[Callable[P, R], **P], _GeneratorContextManager[None]]" [arg-type]
synapse/logging/opentracing.py:1017: error: Argument 2 to "_custom_sync_async_decorator" has incompatible type "Callable[[Arg(Callable[P, R], 'func'), **P], _GeneratorContextManager[None]]"; expected "Callable[[Callable[P, R], **P], _GeneratorContextManager[None]]" [arg-type]
````
* Drive-by improvement to `wrapping_logic` annotation
* Workaround false "unreachable" positives
See https://github.com/Shoobx/mypy-zope/issues/91
```
tests/http/test_proxyagent.py:626: error: Statement is unreachable [unreachable]
tests/http/test_proxyagent.py:762: error: Statement is unreachable [unreachable]
tests/http/test_proxyagent.py:826: error: Statement is unreachable [unreachable]
tests/http/test_proxyagent.py:838: error: Statement is unreachable [unreachable]
tests/http/test_proxyagent.py:845: error: Statement is unreachable [unreachable]
tests/http/federation/test_matrix_federation_agent.py:151: error: Statement is unreachable [unreachable]
tests/http/federation/test_matrix_federation_agent.py:452: error: Statement is unreachable [unreachable]
tests/logging/test_remote_handler.py:60: error: Statement is unreachable [unreachable]
tests/logging/test_remote_handler.py:93: error: Statement is unreachable [unreachable]
tests/logging/test_remote_handler.py:127: error: Statement is unreachable [unreachable]
tests/logging/test_remote_handler.py:152: error: Statement is unreachable [unreachable]
```
* Changelog
* Tweak DBAPI2 Protocol to be accepted by mypy 1.0
Some extra context in:
- https://github.com/matrix-org/python-canonicaljson/pull/57
- https://github.com/python/mypy/issues/6002
- https://mypy.readthedocs.io/en/latest/common_issues.html#covariant-subtyping-of-mutable-protocol-members-is-rejected
* Pull in updated canonicaljson lib
so the protocol check just works
* Improve comments in opentracing
I tried to workaround the ignores but found it too much trouble.
I think the corresponding issue is
https://github.com/python/mypy/issues/12909. The mypy repo has a PR
claiming to fix this (https://github.com/python/mypy/pull/14677) which
might mean this gets resolved soon?
* Better annotation for INTERACTIVE_AUTH_CHECKERS
* Drive-by AUTH_TYPE annotation, to remove an ignore
```py
@trace
@tag_args
async def get_oldest_event_ids_with_depth_in_room(...)
...
```
Before this PR, you would see a warning in the logs and the span was not exported:
```
2022-08-03 19:11:59,383 - synapse.logging.opentracing - 835 - ERROR - GET-0 - @trace may not have wrapped EventFederationWorkerStore.get_oldest_event_ids_with_depth_in_room correctly! The function is not async but returned a coroutine.
```
`start_active_span` was inconsistent as to whether it would activate the span
immediately, or wait for `scope.__enter__` to happen (it depended on whether
the current logcontext already had an associated scope). The inconsistency was
rather confusing if you were hoping to set up a couple of separate spans before
activating either.
Looking at the other implementations of opentracing `ScopeManager`s, the
intention is that it *should* be activated immediately, as the name
implies. Indeed, the idea is that you don't have to use the scope as a
contextmanager at all - you can just call `.close` on the result. Hence, our
cleanup has to happen in `.close` rather than `.__exit__`.
So, the main change here is to ensure that `start_active_span` does activate
the span, and that `scope.close()` does close the scope.
We also add some tests, which requires a `tracer` param so that we don't have
to rely on the global variable in unit tests.
As far as I can tell our logging contexts are meant to log the request ID, or sometimes the request ID followed by a suffix (this is generally stored in the name field of LoggingContext). There's also code to log the name@memory location, but I'm not sure this is ever used.
This simplifies the code paths to require every logging context to have a name and use that in logging. For sub-contexts (created via nested_logging_contexts, defer_to_threadpool, Measure) we use the current context's str (which becomes their name or the string "sentinel") and then potentially modify that (e.g. add a suffix).
Part of #9744
Removes all redundant `# -*- coding: utf-8 -*-` lines from files, as python 3 automatically reads source code as utf-8 now.
`Signed-off-by: Jonathan de Jong <jonathan@automatia.nl>`
This modifies the configuration of structured logging to be usable from
the standard Python logging configuration.
This also separates the formatting of logs from the transport allowing
JSON logs to files or standard logs to sockets.
