decomposer: generate deliverable files for Define the service contract and project architecture for the FastAPI endpoint monitoring service.; Implement the typed monitor CRUD API and concurrency-safe in-memory state according to the service design.; Implement secure on-demand endpoint checks with status updates, latency measurement, robust error handling, and redacted structured logs.; Add operational API endpoints and environment-driven runtime configuration to the monitoring service.; Create automated tests for the monitoring service.; Package the service with Docker and developer documentation.; Validate the complete project.

app/logging.py

@@ -2,16 +2,39 @@ import json
 import logging
 from urllib.parse import urlsplit, urlunsplit
 
-
+_STANDARD = set(logging.makeLogRecord({}).__dict__) | {"message", "asctime"}
-def redacted_url(url: str) -> str:
-    parsed = urlsplit(url)
-    host = parsed.hostname or ""
-    if ":" in host and not host.startswith("["):
-        host = f"[{host}]"
-    if parsed.port:
-        host = f"{host}:{parsed.port}"
-    return urlunsplit((parsed.scheme, host, parsed.path, "REDACTED" if parsed.query else "", ""))
 
 
-def log_event(logger: logging.Logger, event: str, **fields: object) -> None:
+def redact_url(value: str) -> str:
-    logger.info(json.dumps({"event": event, **fields}, default=str, sort_keys=True))
+    try:
+        parsed = urlsplit(value)
+        if parsed.scheme not in {"http", "https"} or not parsed.hostname:
+            return value
+        host = f"[{parsed.hostname}]" if ":" in parsed.hostname else parsed.hostname
+        port = f":{parsed.port}" if parsed.port else ""
+        query = "<redacted>" if parsed.query else ""
+        fragment = "<redacted>" if parsed.fragment else ""
+        return urlunsplit((parsed.scheme, host + port, parsed.path, query, fragment))
+    except ValueError:
+        return "<invalid-url>"
+
+
+class StructuredJsonFormatter(logging.Formatter):
+    def format(self, record: logging.LogRecord) -> str:
+        payload: dict[str, object] = {
+            "level": record.levelname.lower(),
+            "logger": record.name,
+            "message": record.getMessage(),
+        }
+        for key, value in record.__dict__.items():
+            if key not in _STANDARD and not key.startswith("_"):
+                payload[key] = value
+        return json.dumps(payload, default=str, separators=(",", ":"))
+
+
+def configure_logging(level: str) -> None:
+    handler = logging.StreamHandler()
+    handler.setFormatter(StructuredJsonFormatter())
+    root = logging.getLogger()
+    root.handlers[:] = [handler]
+    root.setLevel(level.upper())