Include eventid in log lines when processing incoming federation transactions (#3959)

when processing incoming transactions, it can be hard to see what's going on,
because we process a bunch of stuff in parallel, and because we may end up
recursively working our way through a chain of three or four events.

This commit creates a way to use logcontexts to add the relevant event ids to
the log lines.
This commit is contained in:
Richard van der Hoff 2018-09-27 11:25:34 +01:00 committed by GitHub
parent ae6ad4cf41
commit 4a15a3e4d5
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6 changed files with 115 additions and 57 deletions

View file

@ -46,6 +46,7 @@ from synapse.replication.http.federation import (
from synapse.types import get_domain_from_id
from synapse.util.async_helpers import Linearizer, concurrently_execute
from synapse.util.caches.response_cache import ResponseCache
from synapse.util.logcontext import nested_logging_context
from synapse.util.logutils import log_function
# when processing incoming transactions, we try to handle multiple rooms in
@ -187,21 +188,22 @@ class FederationServer(FederationBase):
for pdu in pdus_by_room[room_id]:
event_id = pdu.event_id
try:
yield self._handle_received_pdu(
origin, pdu
)
pdu_results[event_id] = {}
except FederationError as e:
logger.warn("Error handling PDU %s: %s", event_id, e)
pdu_results[event_id] = {"error": str(e)}
except Exception as e:
f = failure.Failure()
pdu_results[event_id] = {"error": str(e)}
logger.error(
"Failed to handle PDU %s: %s",
event_id, f.getTraceback().rstrip(),
)
with nested_logging_context(event_id):
try:
yield self._handle_received_pdu(
origin, pdu
)
pdu_results[event_id] = {}
except FederationError as e:
logger.warn("Error handling PDU %s: %s", event_id, e)
pdu_results[event_id] = {"error": str(e)}
except Exception as e:
f = failure.Failure()
pdu_results[event_id] = {"error": str(e)}
logger.error(
"Failed to handle PDU %s: %s",
event_id, f.getTraceback().rstrip(),
)
yield concurrently_execute(
process_pdus_for_room, pdus_by_room.keys(),

View file

@ -339,14 +339,18 @@ class FederationHandler(BaseHandler):
"[%s %s] Requesting state at missing prev_event %s",
room_id, event_id, p,
)
state, got_auth_chain = (
yield self.federation_client.get_state_for_room(
origin, room_id, p,
with logcontext.nested_logging_context(p):
state, got_auth_chain = (
yield self.federation_client.get_state_for_room(
origin, room_id, p,
)
)
)
auth_chains.update(got_auth_chain)
state_group = {(x.type, x.state_key): x.event_id for x in state}
state_groups.append(state_group)
auth_chains.update(got_auth_chain)
state_group = {
(x.type, x.state_key): x.event_id for x in state
}
state_groups.append(state_group)
# Resolve any conflicting state
def fetch(ev_ids):
@ -483,20 +487,21 @@ class FederationHandler(BaseHandler):
"[%s %s] Handling received prev_event %s",
room_id, event_id, ev.event_id,
)
try:
yield self.on_receive_pdu(
origin,
ev,
sent_to_us_directly=False,
)
except FederationError as e:
if e.code == 403:
logger.warn(
"[%s %s] Received prev_event %s failed history check.",
room_id, event_id, ev.event_id,
with logcontext.nested_logging_context(ev.event_id):
try:
yield self.on_receive_pdu(
origin,
ev,
sent_to_us_directly=False,
)
else:
raise
except FederationError as e:
if e.code == 403:
logger.warn(
"[%s %s] Received prev_event %s failed history check.",
room_id, event_id, ev.event_id,
)
else:
raise
@defer.inlineCallbacks
def _process_received_pdu(self, origin, event, state, auth_chain):
@ -1135,7 +1140,8 @@ class FederationHandler(BaseHandler):
try:
logger.info("Processing queued PDU %s which was received "
"while we were joining %s", p.event_id, p.room_id)
yield self.on_receive_pdu(origin, p, sent_to_us_directly=True)
with logcontext.nested_logging_context(p.event_id):
yield self.on_receive_pdu(origin, p, sent_to_us_directly=True)
except Exception as e:
logger.warn(
"Error handling queued PDU %s from %s: %s",
@ -1581,15 +1587,22 @@ class FederationHandler(BaseHandler):
Notifies about the events where appropriate.
"""
contexts = yield logcontext.make_deferred_yieldable(defer.gatherResults(
[
logcontext.run_in_background(
self._prep_event,
@defer.inlineCallbacks
def prep(ev_info):
event = ev_info["event"]
with logcontext.nested_logging_context(suffix=event.event_id):
res = yield self._prep_event(
origin,
ev_info["event"],
event,
state=ev_info.get("state"),
auth_events=ev_info.get("auth_events"),
)
defer.returnValue(res)
contexts = yield logcontext.make_deferred_yieldable(defer.gatherResults(
[
logcontext.run_in_background(prep, ev_info)
for ev_info in event_infos
], consumeErrors=True,
))

View file

@ -200,7 +200,7 @@ class LoggingContext(object):
sentinel = Sentinel()
def __init__(self, name=None, parent_context=None):
def __init__(self, name=None, parent_context=None, request=None):
self.previous_context = LoggingContext.current_context()
self.name = name
@ -218,6 +218,13 @@ class LoggingContext(object):
self.parent_context = parent_context
if self.parent_context is not None:
self.parent_context.copy_to(self)
if request is not None:
# the request param overrides the request from the parent context
self.request = request
def __str__(self):
return "%s@%x" % (self.name, id(self))
@ -256,9 +263,6 @@ class LoggingContext(object):
)
self.alive = True
if self.parent_context is not None:
self.parent_context.copy_to(self)
return self
def __exit__(self, type, value, traceback):
@ -439,6 +443,35 @@ class PreserveLoggingContext(object):
)
def nested_logging_context(suffix, parent_context=None):
"""Creates a new logging context as a child of another.
The nested logging context will have a 'request' made up of the parent context's
request, plus the given suffix.
CPU/db usage stats will be added to the parent context's on exit.
Normal usage looks like:
with nested_logging_context(suffix):
# ... do stuff
Args:
suffix (str): suffix to add to the parent context's 'request'.
parent_context (LoggingContext|None): parent context. Will use the current context
if None.
Returns:
LoggingContext: new logging context.
"""
if parent_context is None:
parent_context = LoggingContext.current_context()
return LoggingContext(
parent_context=parent_context,
request=parent_context.request + "-" + suffix,
)
def preserve_fn(f):
"""Function decorator which wraps the function with run_in_background"""
def g(*args, **kwargs):