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Document the behaviour of ResponseCache
it looks like everything that uses ResponseCache expects to have to `make_deferred_yieldable` its results. It's debatable whether that is the best approach, but let's document it for now to avoid further confusion.
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@ -31,6 +31,18 @@ class ResponseCache(object):
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self.timeout_sec = timeout_ms / 1000.
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def get(self, key):
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"""Look up the given key.
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Returns a deferred which doesn't follow the synapse logcontext rules,
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so you'll probably want to make_deferred_yieldable it.
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Args:
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key (str):
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Returns:
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twisted.internet.defer.Deferred|None: None if there is no entry
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for this key; otherwise a deferred result.
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"""
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result = self.pending_result_cache.get(key)
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if result is not None:
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return result.observe()
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@ -38,6 +50,26 @@ class ResponseCache(object):
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return None
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def set(self, key, deferred):
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"""Set the entry for the given key to the given deferred.
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*deferred* should run its callbacks in the sentinel logcontext (ie,
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you should wrap normal synapse deferreds with
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logcontext.run_in_background).
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Returns a new Deferred which also doesn't follow the synapse logcontext
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rules, so you will want to make_deferred_yieldable it
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(TODO: before using this more widely, it might make sense to refactor
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it and get() so that they do the necessary wrapping rather than having
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to do it everywhere ResponseCache is used.)
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Args:
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key (str):
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deferred (twisted.internet.defer.Deferred):
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Returns:
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twisted.internet.defer.Deferred
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"""
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result = ObservableDeferred(deferred, consumeErrors=True)
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self.pending_result_cache[key] = result
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