use additional loki logger

backend/Pipfile

@@ -25,3 +25,4 @@ pymemcache = "*"
 fastapi-cli = "*"
 scikit-learn = "*"
 pyqt6 = "*"
+loki-logger-handler = "*"

backend/Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "bb22b4e28c7aa199c94b688ad93d3ab0ccf1089a172131f4aec03b78e7bd7f1c"
+            "sha256": "6edd6644586e8814a0b4526adb3352dfc17828ca129de7a68c1d5929efe94daa"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -507,6 +507,15 @@
             "markers": "python_version >= '3.8'",
             "version": "==1.4.7"
         },
+        "loki-logger-handler": {
+            "hashes": [
+                "sha256:aa1a9c933282c134a1e4271aba3cbaa2a3660eab6ea415bad7a072444ab98aa8",
+                "sha256:f6114727a9e5e6f3f2058b9b5324d1cab6d1a04e802079f7b57a8aeb7bd0a112"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '2.7'",
+            "version": "==1.0.2"
+        },
         "lxml": {
             "hashes": [
                 "sha256:01220dca0d066d1349bd6a1726856a78f7929f3878f7e2ee83c296c69495309e",

backend/src/constants.py

@@ -1,4 +1,4 @@
-"""Module allowing to access the parameters of route generation"""
+"""Module setting global parameters for the application, such as logging, cache, route generation, etc."""
 
 import logging
 import os
@@ -16,19 +16,33 @@ cache_dir_string = os.getenv('OSM_CACHE_DIR', './cache')
 OSM_CACHE_DIR = Path(cache_dir_string)
 
 
-# if we are in a debug session, set verbose and rich logging
-if os.getenv('DEBUG', "false") == "true":
+# if we are in a debug (local) session, set verbose and rich logging
+debug = os.getenv('DEBUG', "false") == "true"
+if os.getenv('KUBERNETES_SERVICE_HOST', None) is not None:
+    # in that case we want to log to stdout and also to loki
+    from loki_logger_handler.loki_logger_handler import LokiLoggerHandler
+    loki_handler = LokiLoggerHandler(
+        url=os.getenv('LOKI_URL', 'http://loki:3100'),
+        labels={'app': 'anyway', 'env': 'production' if debug else 'staging'}
+    )
+    if debug:
+        logging.basicConfig(
+            level=logging.DEBUG,
+            handlers=[loki_handler, logging.StreamHandler()]
+        )
+    else:
+        logging.basicConfig(
+            level=logging.INFO,
+            handlers=[loki_handler, logging.StreamHandler()]
+        )
+else:
+    # in that case we are local and we want to log to stdout only, but make it pretty
     from rich.logging import RichHandler
     logging.basicConfig(
         level=logging.DEBUG,
         format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
         handlers=[RichHandler()]
     )
-else:
-    logging.basicConfig(
-        level=logging.INFO,
-        format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
-    )
 
 
 MEMCACHED_HOST_PATH = os.getenv('MEMCACHED_HOST_PATH', None)

backend/src/main.py

@@ -11,7 +11,7 @@ from .utils.landmarks_manager import LandmarkManager
 from .utils.toilets_manager import ToiletsManager
 from .utils.optimizer import Optimizer
 from .utils.refiner import Refiner
-from .persistence import client as cache_client
+from .cache import client as cache_client
 
 
 logger = logging.getLogger(__name__)

backend/src/tests/test_utils.py

@@ -4,7 +4,7 @@ from fastapi import HTTPException
 from pydantic import ValidationError
 
 from ..structs.landmark import Landmark
-from ..persistence import client as cache_client
+from ..cache import client as cache_client
 
 
 def landmarks_to_osmid(landmarks: list[Landmark]) -> list[int] :