From b4a453be04564a05bf633bccc78439735a662f67 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Trkan?= <lukas@trkan.cz>
Date: Thu, 30 Oct 2025 17:38:13 +0100
Subject: [PATCH] feat(logs): add loki logging

---
 7project/backend/app/app.py              | 23 +++++++++++++++++++++--
 7project/backend/requirements.txt        |  2 ++
 7project/tofu/modules/prometheus/main.tf | 18 ++++++++++++++++++
 3 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/7project/backend/app/app.py b/7project/backend/app/app.py
index 30578b1..98b2c66 100644
--- a/7project/backend/app/app.py
+++ b/7project/backend/app/app.py
@@ -1,6 +1,8 @@
 import logging
 import os
+import sys
 from datetime import datetime
+from pythonjsonlogger import jsonlogger
 
 from fastapi import Depends, FastAPI
 from fastapi.middleware.cors import CORSMiddleware
@@ -58,7 +60,24 @@ fastApi.include_router(auth_router)
 fastApi.include_router(categories_router)
 fastApi.include_router(transactions_router)
 
-logging.basicConfig(filename='app.log', level=logging.INFO, format='%(asctime)s %(message)s')
+
+for h in list(logging.root.handlers):
+    logging.root.removeHandler(h)
+
+_log_handler = logging.StreamHandler(sys.stdout)
+_formatter = jsonlogger.JsonFormatter(
+    fmt='%(asctime)s %(levelname)s %(name)s %(message)s %(pathname)s %(lineno)d %(process)d %(thread)d'
+)
+_log_handler.setFormatter(_formatter)
+
+logging.root.setLevel(logging.INFO)
+logging.root.addHandler(_log_handler)
+
+
+for _name in ("uvicorn", "uvicorn.error", "uvicorn.access"):
+    _logger = logging.getLogger(_name)
+    _logger.handlers = [_log_handler]
+    _logger.propagate = True
 
 
 @fastApi.middleware("http")
@@ -95,7 +114,7 @@ async def log_traffic(request: Request, call_next):
         "process_time": process_time,
         "client_host": client_host
     }
-    logging.info(str(log_params))
+    logging.getLogger(__name__).info("http_request", extra=log_params)
     return response
 
 
diff --git a/7project/backend/requirements.txt b/7project/backend/requirements.txt
index d7f5316..840974c 100644
--- a/7project/backend/requirements.txt
+++ b/7project/backend/requirements.txt
@@ -70,3 +70,5 @@ watchfiles==1.1.0
 wcwidth==0.2.14
 websockets==15.0.1
 yarl==1.20.1
+
+python-json-logger==2.0.7
\ No newline at end of file
diff --git a/7project/tofu/modules/prometheus/main.tf b/7project/tofu/modules/prometheus/main.tf
index e943cfa..fcf553c 100644
--- a/7project/tofu/modules/prometheus/main.tf
+++ b/7project/tofu/modules/prometheus/main.tf
@@ -64,3 +64,21 @@ resource "kubectl_manifest" "argocd-tunnel-bind" {
     base_domain = var.cloudflare_domain
   })
 }
+
+resource "helm_release" "loki_stack" {
+  name       = "loki-stack"
+  repository = "https://grafana.github.io/helm-charts"
+  chart      = "loki-stack"
+  namespace  = kubernetes_namespace.monitoring.metadata[0].name
+  version = "2.9.12"
+
+  set = [{
+    name  = "grafana.enabled"
+    value = "false"
+  }]
+
+
+  depends_on = [
+    helm_release.kube_prometheus_stack
+  ]
+}