Always use the name as the log ID. (#9829)

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).

1 files changed, 4 insertions, 11 deletions

diff --git a/synapse/metrics/background_process_metrics.py b/synapse/metrics/background_process_metrics.py
index e8a9096c03..78e9cfbc26 100644
--- a/synapse/metrics/background_process_metrics.py
+++ b/synapse/metrics/background_process_metrics.py
@@ -16,7 +16,7 @@
 import logging
 import threading
 from functools import wraps
-from typing import TYPE_CHECKING, Dict, Optional, Set, Union
+from typing import TYPE_CHECKING, Dict, Optional, Set
 
 from prometheus_client.core import REGISTRY, Counter, Gauge
 
@@ -199,7 +199,7 @@ def run_as_background_process(desc: str, func, *args, bg_start_span=True, **kwar
         _background_process_start_count.labels(desc).inc()
         _background_process_in_flight_count.labels(desc).inc()
 
-        with BackgroundProcessLoggingContext(desc, count) as context:
+        with BackgroundProcessLoggingContext("%s-%s" % (desc, count)) as context:
             try:
                 ctx = noop_context_manager()
                 if bg_start_span:
@@ -242,19 +242,12 @@ class BackgroundProcessLoggingContext(LoggingContext):
     processes.
     """
 
-    __slots__ = ["_id", "_proc"]
+    __slots__ = ["_proc"]
 
-    def __init__(self, name: str, id: Optional[Union[int, str]] = None):
+    def __init__(self, name: str):
         super().__init__(name)
-        self._id = id
-
         self._proc = _BackgroundProcess(name, self)
 
-    def __str__(self) -> str:
-        if self._id is not None:
-            return "%s-%s" % (self.name, self._id)
-        return "%s@%x" % (self.name, id(self))
-
     def start(self, rusage: "Optional[resource._RUsage]"):
         """Log context has started running (again)."""