SQLite cache: Use SQLite write-ahead logging for better concurrency

This allows read operations to not block writes.

[1] https://sqlite.org/wal.html

Author: amotl

CHANGES.rst

@@ -5,6 +5,10 @@ grafana-wtf changelog
 
 in progress
 ===========
+- SQLite cache: Use `SQLite write-ahead logging`_ for better concurrency
+  behaviour, allowing read operations to not block writes. Thanks, @JWCook.
+
+.. _SQLite write-ahead logging: https://sqlite.org/wal.html
 
 2024-03-31 0.19.0
 =================

grafana_wtf/core.py

@@ -72,7 +72,7 @@ def enable_cache(self, expire_after=60, drop_cache=False):
             log.info(f"Response cache will expire after {expire_after} seconds")
 
         session = CachedSession(
-            cache_name=__appname__, expire_after=expire_after, use_cache_dir=True, **self.session_args
+            cache_name=__appname__, expire_after=expire_after, use_cache_dir=True, wal=True, **self.session_args
         )
         self.set_session(session)
         self.set_user_agent()