014 add json logging

tests/logging/test_json_logging.py

@@ -0,0 +1,56 @@
+import json
+import logging
+from io import StringIO
+
+import structlog
+
+from app.runtime.logging import configure_logging
+
+
+def test_application_log_is_serialized_as_json() -> None:
+    stream = StringIO()
+
+    configure_logging(stream=stream)
+
+    logging.getLogger("app.test").info("application_event")
+
+    payload = json.loads(stream.getvalue().splitlines()[0])
+
+    assert payload["event"] == "application_event"
+    assert payload["level"] == "info"
+    assert payload["logger"] == "app.test"
+    assert isinstance(payload["timestamp"], str)
+
+    _reset_logging()
+
+
+def test_uvicorn_loggers_use_shared_json_logging_setup() -> None:
+    stream = StringIO()
+
+    configure_logging(stream=stream)
+
+    logging.getLogger("uvicorn.error").error("uvicorn_error_event")
+    logging.getLogger("uvicorn.access").info("uvicorn_access_event")
+
+    records = [json.loads(line) for line in stream.getvalue().splitlines()]
+
+    assert [record["event"] for record in records] == [
+        "uvicorn_error_event",
+        "uvicorn_access_event",
+    ]
+    assert [record["logger"] for record in records] == [
+        "uvicorn.error",
+        "uvicorn.access",
+    ]
+    assert all(record["level"] in {"error", "info"} for record in records)
+    assert all(isinstance(record["timestamp"], str) for record in records)
+
+    _reset_logging()
+
+
+def _reset_logging() -> None:
+    structlog.reset_defaults()
+    root_logger = logging.getLogger()
+    root_logger.handlers = []
+    for logger_name in ("uvicorn", "uvicorn.error", "uvicorn.access"):
+        logging.getLogger(logger_name).handlers = []