Merge pull request #1036 from Aiven-Open/keejon/fix-lru-cache

fix: use async lru_cache

pyproject.toml

@@ -12,6 +12,7 @@ dependencies = [
   "accept-types < 1",
   "aiohttp < 4",
   "aiokafka == 0.10.0",
+  "async_lru",
   "cachetools == 5.3.3",
   "confluent-kafka == 2.4.0",
   "isodate < 1",

requirements/requirements-dev.txt

@@ -16,6 +16,8 @@ aiosignal==1.3.1
     # via aiohttp
 anyio==4.4.0
     # via watchfiles
+async-lru==2.0.4
+    # via karapace (/karapace/pyproject.toml)
 async-timeout==4.0.3
     # via
     #   aiohttp
@@ -208,6 +210,7 @@ tomli==2.0.1
 typing-extensions==4.12.2
     # via
     #   anyio
+    #   async-lru
     #   karapace (/karapace/pyproject.toml)
 ujson==5.10.0
     # via karapace (/karapace/pyproject.toml)

requirements/requirements-typing.txt

@@ -16,6 +16,8 @@ aiosignal==1.3.1
     # via aiohttp
 anyio==4.5.0
     # via watchfiles
+async-lru==2.0.4
+    # via karapace (/karapace/pyproject.toml)
 async-timeout==4.0.3
     # via
     #   aiohttp
@@ -113,6 +115,7 @@ types-protobuf==3.20.4.6
 typing-extensions==4.12.2
     # via
     #   anyio
+    #   async-lru
     #   karapace (/karapace/pyproject.toml)
     #   multidict
     #   mypy

requirements/requirements.txt

@@ -16,6 +16,8 @@ aiosignal==1.3.1
     # via aiohttp
 anyio==4.4.0
     # via watchfiles
+async-lru==2.0.4
+    # via karapace (/karapace/pyproject.toml)
 async-timeout==4.0.3
     # via
     #   aiohttp
@@ -96,6 +98,7 @@ tenacity==9.0.0
 typing-extensions==4.12.2
     # via
     #   anyio
+    #   async-lru
     #   karapace (/karapace/pyproject.toml)
 ujson==5.10.0
     # via karapace (/karapace/pyproject.toml)

src/karapace/serialization.py

@@ -5,10 +5,10 @@
 from __future__ import annotations
 
 from aiohttp import BasicAuth
+from async_lru import alru_cache
 from avro.io import BinaryDecoder, BinaryEncoder, DatumReader, DatumWriter
 from cachetools import TTLCache
 from collections.abc import MutableMapping
-from functools import lru_cache
 from google.protobuf.message import DecodeError
 from jsonschema import ValidationError
 from karapace.client import Client
@@ -180,7 +180,7 @@ async def _get_schema_recursive(
         except InvalidSchema as e:
             raise SchemaRetrievalError(f"Failed to parse schema string from response: {json_result}") from e
 
-    @lru_cache(maxsize=100)
+    @alru_cache(maxsize=100)
     async def get_schema(
         self,
         subject: Subject,

tests/integration/test_client_protobuf.py

@@ -18,6 +18,12 @@ async def test_remote_client_protobuf(registry_async_client):
     assert sc_id >= 0
     stored_schema, _ = await reg_cli.get_schema_for_id(sc_id)
     assert stored_schema == schema_protobuf, f"stored schema {stored_schema} is not {schema_protobuf}"
+
+    stored_id, stored_schema, _ = await reg_cli.get_schema(subject)
+    assert stored_id == sc_id
+    assert stored_schema == schema_protobuf
+
+    # get same schema a second time to hit cache
     stored_id, stored_schema, _ = await reg_cli.get_schema(subject)
     assert stored_id == sc_id
     assert stored_schema == schema_protobuf