fix: msgspec json log rendering

Adds a custom rendering processor to the processor chain that uses
msgspec encoder.

Closes #166

src/starlite_saqlalchemy/log/__init__.py

@@ -5,13 +5,13 @@
 import logging
 from typing import TYPE_CHECKING
 
-import msgspec
 import structlog
 from starlite.config.logging import LoggingConfig
 
 from starlite_saqlalchemy import settings
 
 from . import controller, worker
+from .msgspec_renderer import msgspec_json_renderer
 
 if TYPE_CHECKING:
     from collections.abc import Sequence
@@ -27,24 +27,20 @@
     "worker",
 )
 
+
 default_processors = [
     structlog.contextvars.merge_contextvars,
     controller.drop_health_logs,
     structlog.processors.add_log_level,
     structlog.processors.TimeStamper(fmt="iso", utc=True),
 ]
 
-if settings.app.ENVIRONMENT == "local":
+if settings.app.ENVIRONMENT == "local":  # pragma: no cover
     LoggerFactory: Any = structlog.WriteLoggerFactory
     default_processors.extend([structlog.dev.ConsoleRenderer()])
-else:  # pragma: no cover
+else:
     LoggerFactory = structlog.BytesLoggerFactory
-    default_processors.extend(
-        [
-            structlog.processors.dict_tracebacks,
-            structlog.processors.JSONRenderer(serializer=msgspec.json.encode),
-        ]
-    )
+    default_processors.extend([structlog.processors.dict_tracebacks, msgspec_json_renderer])
 
 
 def configure(processors: Sequence[Processor]) -> None:

src/starlite_saqlalchemy/log/msgspec_renderer.py

@@ -0,0 +1,31 @@
+"""A JSON Renderer for structlog using msgspec.
+
+Msgspec doesn't have an API consistent with the stdlib's `json` module,
+which is required for structlog's `JSONRenderer`.
+"""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+import msgspec
+
+if TYPE_CHECKING:
+    from structlog.typing import EventDict, WrappedLogger
+
+
+_encoder = msgspec.json.Encoder()
+
+
+def msgspec_json_renderer(_: WrappedLogger, __: str, event_dict: EventDict) -> bytes:
+    """Structlog processor that uses `msgspec` for JSON encoding.
+
+    Args:
+        _ ():
+        __ ():
+        event_dict (): The data to be logged.
+
+    Returns:
+        The log event encoded to JSON by msgspec.
+    """
+    return _encoder.encode(event_dict)