From 44a498418c62a835aae9bff8550f844888b3ab84 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff Date: Thu, 11 Jan 2018 22:40:51 +0000 Subject: [PATCH] Optimise LoggingContext creation and copying It turns out that the only thing we use the __dict__ of LoggingContext for is `request`, and given we create lots of LoggingContexts and then copy them every time we do a db transaction or log line, using the __dict__ seems a bit redundant. Let's try to optimise things by making the request attribute explicit. --- synapse/util/logcontext.py | 25 ++++++++++++++++++------- tests/crypto/test_keyring.py | 14 +++++++------- tests/util/test_logcontext.py | 16 ++++++++-------- 3 files changed, 33 insertions(+), 22 deletions(-) diff --git a/synapse/util/logcontext.py b/synapse/util/logcontext.py index 48c9f6802d..ca71a1fc27 100644 --- a/synapse/util/logcontext.py +++ b/synapse/util/logcontext.py @@ -52,13 +52,16 @@ except Exception: class LoggingContext(object): """Additional context for log formatting. Contexts are scoped within a "with" block. + Args: name (str): Name for the context for debugging. """ __slots__ = [ - "previous_context", "name", "usage_start", "usage_end", "main_thread", - "__dict__", "tag", "alive", + "previous_context", "name", "ru_stime", "ru_utime", + "db_txn_count", "db_txn_duration", "usage_start", "usage_end", + "main_thread", "alive", + "request", "tag", ] thread_local = threading.local() @@ -96,7 +99,9 @@ class LoggingContext(object): self.db_txn_count = 0 self.db_txn_duration = 0. self.usage_start = None + self.usage_end = None self.main_thread = threading.current_thread() + self.request = None self.tag = "" self.alive = True @@ -105,7 +110,11 @@ class LoggingContext(object): @classmethod def current_context(cls): - """Get the current logging context from thread local storage""" + """Get the current logging context from thread local storage + + Returns: + LoggingContext: the current logging context + """ return getattr(cls.thread_local, "current_context", cls.sentinel) @classmethod @@ -155,11 +164,13 @@ class LoggingContext(object): self.alive = False def copy_to(self, record): - """Copy fields from this context to the record""" - for key, value in self.__dict__.items(): - setattr(record, key, value) + """Copy logging fields from this context to a log record or + another LoggingContext + """ - record.ru_utime, record.ru_stime = self.get_resource_usage() + # 'request' is the only field we currently use in the logger, so that's + # all we need to copy + record.request = self.request def start(self): if threading.current_thread() is not self.main_thread: diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py index 570312da84..c899fecf5d 100644 --- a/tests/crypto/test_keyring.py +++ b/tests/crypto/test_keyring.py @@ -68,7 +68,7 @@ class KeyringTestCase(unittest.TestCase): def check_context(self, _, expected): self.assertEquals( - getattr(LoggingContext.current_context(), "test_key", None), + getattr(LoggingContext.current_context(), "request", None), expected ) @@ -82,7 +82,7 @@ class KeyringTestCase(unittest.TestCase): lookup_2_deferred = defer.Deferred() with LoggingContext("one") as context_one: - context_one.test_key = "one" + context_one.request = "one" wait_1_deferred = kr.wait_for_previous_lookups( ["server1"], @@ -96,7 +96,7 @@ class KeyringTestCase(unittest.TestCase): wait_1_deferred.addBoth(self.check_context, "one") with LoggingContext("two") as context_two: - context_two.test_key = "two" + context_two.request = "two" # set off another wait. It should block because the first lookup # hasn't yet completed. @@ -137,7 +137,7 @@ class KeyringTestCase(unittest.TestCase): @defer.inlineCallbacks def get_perspectives(**kwargs): self.assertEquals( - LoggingContext.current_context().test_key, "11", + LoggingContext.current_context().request, "11", ) with logcontext.PreserveLoggingContext(): yield persp_deferred @@ -145,7 +145,7 @@ class KeyringTestCase(unittest.TestCase): self.http_client.post_json.side_effect = get_perspectives with LoggingContext("11") as context_11: - context_11.test_key = "11" + context_11.request = "11" # start off a first set of lookups res_deferreds = kr.verify_json_objects_for_server( @@ -173,7 +173,7 @@ class KeyringTestCase(unittest.TestCase): self.assertIs(LoggingContext.current_context(), context_11) context_12 = LoggingContext("12") - context_12.test_key = "12" + context_12.request = "12" with logcontext.PreserveLoggingContext(context_12): # a second request for a server with outstanding requests # should block rather than start a second call @@ -211,7 +211,7 @@ class KeyringTestCase(unittest.TestCase): sentinel_context = LoggingContext.current_context() with LoggingContext("one") as context_one: - context_one.test_key = "one" + context_one.request = "one" defer = kr.verify_json_for_server("server9", {}) try: diff --git a/tests/util/test_logcontext.py b/tests/util/test_logcontext.py index e2f7765f49..4850722bc5 100644 --- a/tests/util/test_logcontext.py +++ b/tests/util/test_logcontext.py @@ -12,12 +12,12 @@ class LoggingContextTestCase(unittest.TestCase): def _check_test_key(self, value): self.assertEquals( - LoggingContext.current_context().test_key, value + LoggingContext.current_context().request, value ) def test_with_context(self): with LoggingContext() as context_one: - context_one.test_key = "test" + context_one.request = "test" self._check_test_key("test") @defer.inlineCallbacks @@ -25,14 +25,14 @@ class LoggingContextTestCase(unittest.TestCase): @defer.inlineCallbacks def competing_callback(): with LoggingContext() as competing_context: - competing_context.test_key = "competing" + competing_context.request = "competing" yield sleep(0) self._check_test_key("competing") reactor.callLater(0, competing_callback) with LoggingContext() as context_one: - context_one.test_key = "one" + context_one.request = "one" yield sleep(0) self._check_test_key("one") @@ -43,14 +43,14 @@ class LoggingContextTestCase(unittest.TestCase): @defer.inlineCallbacks def cb(): - context_one.test_key = "one" + context_one.request = "one" yield function() self._check_test_key("one") callback_completed[0] = True with LoggingContext() as context_one: - context_one.test_key = "one" + context_one.request = "one" # fire off function, but don't wait on it. logcontext.preserve_fn(cb)() @@ -107,7 +107,7 @@ class LoggingContextTestCase(unittest.TestCase): sentinel_context = LoggingContext.current_context() with LoggingContext() as context_one: - context_one.test_key = "one" + context_one.request = "one" d1 = logcontext.make_deferred_yieldable(blocking_function()) # make sure that the context was reset by make_deferred_yieldable @@ -124,7 +124,7 @@ class LoggingContextTestCase(unittest.TestCase): argument isn't actually a deferred""" with LoggingContext() as context_one: - context_one.test_key = "one" + context_one.request = "one" d1 = logcontext.make_deferred_yieldable("bum") self._check_test_key("one")