diff options
| -rw-r--r-- | docs/log_contexts.rst | 8 | ||||
| -rw-r--r-- | synapse/util/logcontext.py | 53 |
2 files changed, 33 insertions, 28 deletions
diff --git a/docs/log_contexts.rst b/docs/log_contexts.rst index b19b7fa1ea..82ac4f91e5 100644 --- a/docs/log_contexts.rst +++ b/docs/log_contexts.rst @@ -279,9 +279,9 @@ Obviously that option means that the operations done in that might be fixed by setting a different logcontext via a ``with LoggingContext(...)`` in ``background_operation``). -The second option is to use ``logcontext.preserve_fn``, which wraps a function -so that it doesn't reset the logcontext even when it returns an incomplete -deferred, and adds a callback to the returned deferred to reset the +The second option is to use ``logcontext.run_in_background``, which wraps a +function so that it doesn't reset the logcontext even when it returns an +incomplete deferred, and adds a callback to the returned deferred to reset the logcontext. In other words, it turns a function that follows the Synapse rules about logcontexts and Deferreds into one which behaves more like an external function — the opposite operation to that described in the previous section. @@ -293,7 +293,7 @@ It can be used like this: def do_request_handling(): yield foreground_operation() - logcontext.preserve_fn(background_operation)() + logcontext.run_in_background(background_operation) # this will now be logged against the request context logger.debug("Request handling complete") diff --git a/synapse/util/logcontext.py b/synapse/util/logcontext.py index a8dea15c1b..d660ec785b 100644 --- a/synapse/util/logcontext.py +++ b/synapse/util/logcontext.py @@ -292,36 +292,41 @@ class PreserveLoggingContext(object): def preserve_fn(f): - """Wraps a function, to ensure that the current context is restored after + """Function decorator which wraps the function with run_in_background""" + def g(*args, **kwargs): + return run_in_background(f, *args, **kwargs) + return g + + +def run_in_background(f, *args, **kwargs): + """Calls a function, ensuring that the current context is restored after return from the function, and that the sentinel context is set once the deferred returned by the funtion completes. Useful for wrapping functions that return a deferred which you don't yield on. """ - def g(*args, **kwargs): - current = LoggingContext.current_context() - res = f(*args, **kwargs) - if isinstance(res, defer.Deferred) and not res.called: - # The function will have reset the context before returning, so - # we need to restore it now. - LoggingContext.set_current_context(current) - - # The original context will be restored when the deferred - # completes, but there is nothing waiting for it, so it will - # get leaked into the reactor or some other function which - # wasn't expecting it. We therefore need to reset the context - # here. - # - # (If this feels asymmetric, consider it this way: we are - # effectively forking a new thread of execution. We are - # probably currently within a ``with LoggingContext()`` block, - # which is supposed to have a single entry and exit point. But - # by spawning off another deferred, we are effectively - # adding a new exit point.) - res.addBoth(_set_context_cb, LoggingContext.sentinel) - return res - return g + current = LoggingContext.current_context() + res = f(*args, **kwargs) + if isinstance(res, defer.Deferred) and not res.called: + # The function will have reset the context before returning, so + # we need to restore it now. + LoggingContext.set_current_context(current) + + # The original context will be restored when the deferred + # completes, but there is nothing waiting for it, so it will + # get leaked into the reactor or some other function which + # wasn't expecting it. We therefore need to reset the context + # here. + # + # (If this feels asymmetric, consider it this way: we are + # effectively forking a new thread of execution. We are + # probably currently within a ``with LoggingContext()`` block, + # which is supposed to have a single entry and exit point. But + # by spawning off another deferred, we are effectively + # adding a new exit point.) + res.addBoth(_set_context_cb, LoggingContext.sentinel) + return res def make_deferred_yieldable(deferred): |