improvement(error_handlers): Add context dump to the exceptions

This commit adds additional information and trace ids to the exception
that occur inside the API calls, allowing to collect more information
about the error, including the request data.

Fixes scylladb#492

argus/backend/error_handlers.py

@@ -1,4 +1,7 @@
+import base64
+from hashlib import sha256
 import logging
+import os
 from traceback import format_exception
 from flask import request
 
@@ -12,14 +15,24 @@ class DataValidationError(APIException):
     pass
 
 def handle_api_exception(exception: Exception):
+    trace_id = base64.encodebytes(sha256(os.urandom(64)).digest()).decode(encoding="utf-8").strip()
     if issubclass(exception.__class__, APIException):
+        LOGGER.info("TraceId: %s", trace_id)
         LOGGER.info("Endpoint %s responded with error %s: %s", request.endpoint, exception.__class__.__name__, str(exception))
+        LOGGER.info("Headers\n%s", request.headers)
+        LOGGER.info("Request Data Start\n%s\nRequest Data End", request.json if request.is_json else request.get_data(as_text=True))
+        LOGGER.info("TraceId: %s", trace_id)
     else:
+        LOGGER.error("TraceId: %s", trace_id)
         LOGGER.error("Exception in %s\n%s", request.endpoint, "".join(format_exception(exception)))
+        LOGGER.error("Headers\n%s", request.headers)
+        LOGGER.error("Request Data Start\n%s\nRequest Data End", request.json if request.is_json else request.get_data(as_text=True))
+        LOGGER.error("TraceId: %s", trace_id)
 
     return {
         "status": "error",
         "response": {
+            "trace_id": trace_id,
             "exception": exception.__class__.__name__,
             "arguments": exception.args
         }