Add orjson JSON serializer for FastAPI & structlog performance

.vscode/settings.json

@@ -8,6 +8,7 @@
     "linkpulse",
     "migratehistory",
     "Nixpacks",
+    "ORJSON",
     "pytz",
     "starlette",
     "structlog",

CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added the `orjson` serializer for faster JSON serialization
+  - Used in `structlog`'s `JSONRenderer` for production logging
+  - Used in `fastapi`'s `Response` for faster response serialization
 - Improved documentation in multiple files
   - `__main__.py`
   - `logging.py`

backend/linkpulse/app.py

@@ -13,12 +13,13 @@ from apscheduler.triggers.interval import IntervalTrigger  # type: ignore
 from asgi_correlation_id import CorrelationIdMiddleware
 from dotenv import load_dotenv
 from fastapi import FastAPI, Request, Response, status
+from fastapi.responses import ORJSONResponse
 from fastapi_cache import FastAPICache
 from fastapi_cache.backends.inmemory import InMemoryBackend
 from fastapi_cache.decorator import cache
 from linkpulse.logging import setup_logging
 from linkpulse.middleware import LoggingMiddleware
-from linkpulse.utilities import get_ip, hide_ip, is_development, get_db
+from linkpulse.utilities import get_db, get_ip, hide_ip, is_development
 from psycopg2.extras import execute_values
 
 load_dotenv(dotenv_path=".env")
@@ -113,7 +114,7 @@ class IPCounter:
     last_seen: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
 
 
-app = FastAPI(lifespan=lifespan)
+app = FastAPI(lifespan=lifespan, default_response_class=ORJSONResponse)
 
 setup_logging()
 

backend/linkpulse/logging.py

@@ -1,13 +1,20 @@
 import logging
 import os
 import sys
-from typing import List, Optional
+from typing import Any, List, Optional
 
 import structlog
 from structlog.types import EventDict, Processor
 
 
-def rename_event_key(_, __, event_dict: EventDict) -> EventDict:
+def decode_bytes(_: Any, __: Any, bs: bytes) -> str:
+    """
+    orjson returns bytes; we need strings
+    """
+    return bs.decode()
+
+
+def rename_event_key(_: Any, __: Any, event_dict: EventDict) -> EventDict:
     """
     Renames the `event` key to `msg`, as Railway expects it in that form.
     """
@@ -15,7 +22,7 @@ def rename_event_key(_, __, event_dict: EventDict) -> EventDict:
     return event_dict
 
 
-def drop_color_message_key(_, __, event_dict: EventDict) -> EventDict:
+def drop_color_message_key(_: Any, __: Any, event_dict: EventDict) -> EventDict:
     """
     Uvicorn logs the message a second time in the extra `color_message`, but we don't
     need it. This processor drops the key from the event dict if it exists.
@@ -80,7 +87,9 @@ def setup_logging(
 
     log_renderer: structlog.types.Processor
     if json_logs:
-        log_renderer = structlog.processors.JSONRenderer()
+        import orjson
+
+        log_renderer = structlog.processors.JSONRenderer(serializer=orjson.dumps)
     else:
         log_renderer = structlog.dev.ConsoleRenderer()
 
@@ -92,6 +101,8 @@ def setup_logging(
             # Remove _record & _from_structlog.
             structlog.stdlib.ProcessorFormatter.remove_processors_meta,
             log_renderer,
+            # required with orjson
+            *([decode_bytes] if json_logs else []),  # type: ignore
         ],
     )
 

backend/poetry.lock

@@ -531,6 +531,73 @@ files = [
 [package.dependencies]
 psutil = "*"
 
+[[package]]
+name = "orjson"
+version = "3.10.10"
+description = "Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "orjson-3.10.10-cp310-cp310-macosx_10_15_x86_64.macosx_11_0_arm64.macosx_10_15_universal2.whl", hash = "sha256:b788a579b113acf1c57e0a68e558be71d5d09aa67f62ca1f68e01117e550a998"},
+    {file = "orjson-3.10.10-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:804b18e2b88022c8905bb79bd2cbe59c0cd014b9328f43da8d3b28441995cda4"},
+    {file = "orjson-3.10.10-cp310-cp310-manylinux_2_17_armv7l.manylinux2014_armv7l.whl", hash = "sha256:9972572a1d042ec9ee421b6da69f7cc823da5962237563fa548ab17f152f0b9b"},
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+    {file = "orjson-3.10.10.tar.gz", hash = "sha256:37949383c4df7b4337ce82ee35b6d7471e55195efa7dcb45ab8226ceadb0fe3b"},
+]
+
 [[package]]
 name = "packaging"
 version = "24.1"
@@ -1126,4 +1193,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.12"
-content-hash = "a0cc32861b71da789edc5df54e79239d6cca81cb3d14984a1306a3f92735589f"
+content-hash = "674210864455c4a103c7e78f9879c0360fcdc0ae62d36a2fe44f1df4f59f04e6"

backend/pyproject.toml

@@ -26,6 +26,7 @@ psycopg2 = "^2.9.10"
 structlog = "^24.4.0"
 uvicorn = "^0.32.0"
 asgi-correlation-id = "^4.3.4"
+orjson = "^3.10.10"
 
 
 [tool.poetry.group.dev.dependencies]