From a423419eca285d0b23ad3f31956297851a608d22 Mon Sep 17 00:00:00 2001
From: Hassan Abouelela <47495861+HassanAbouelela@users.noreply.github.com>
Date: Sun, 14 Mar 2021 10:45:36 +0300
Subject: Adds Logging Support

Adds formatters and handlers for logging.

Signed-off-by: Hassan Abouelela <47495861+HassanAbouelela@users.noreply.github.com>
---
 .dockerignore        |  1 +
 .gitignore           |  3 +++
 backend/__init__.py  |  3 +++
 backend/constants.py |  2 ++
 backend/logs.py      | 45 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 54 insertions(+)
 create mode 100644 backend/logs.py

diff --git a/.dockerignore b/.dockerignore
index b87d345..6d587e9 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -9,3 +9,4 @@ __pycache__
 .github
 .gitlab
 .gitignore
+logs/
diff --git a/.gitignore b/.gitignore
index f2bc6c8..4b518e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -133,3 +133,6 @@ dmypy.json
 
 # VSCode Settings
 .vscode/settings.json
+
+# Logs
+logs/
diff --git a/backend/__init__.py b/backend/__init__.py
index 220b457..f8b0afe 100644
--- a/backend/__init__.py
+++ b/backend/__init__.py
@@ -1,3 +1,5 @@
+import logging
+
 import sentry_sdk
 from sentry_sdk.integrations.asgi import SentryAsgiMiddleware
 from starlette.applications import Starlette
@@ -6,6 +8,7 @@ from starlette.middleware.authentication import AuthenticationMiddleware
 from starlette.middleware.cors import CORSMiddleware
 
 from backend import constants
+from backend import logs  # This has to be imported before other logging statements
 from backend.authentication import JWTAuthenticationBackend
 from backend.middleware import DatabaseMiddleware, ProtectedDocsMiddleware
 from backend.route_manager import create_route_map
diff --git a/backend/constants.py b/backend/constants.py
index d90fd9a..50c09ea 100644
--- a/backend/constants.py
+++ b/backend/constants.py
@@ -15,6 +15,8 @@ SNEKBOX_URL = os.getenv("SNEKBOX_URL", "http://snekbox.default.svc.cluster.local
 PRODUCTION = os.getenv("PRODUCTION", "True").lower() != "false"
 PRODUCTION_URL = "https://forms.pythondiscord.com"
 
+LOG_FILES = os.getenv("LOG_FILES", "False").lower() != "false"
+
 OAUTH2_CLIENT_ID = os.getenv("OAUTH2_CLIENT_ID")
 OAUTH2_CLIENT_SECRET = os.getenv("OAUTH2_CLIENT_SECRET")
 OAUTH2_REDIRECT_URI = os.getenv(
diff --git a/backend/logs.py b/backend/logs.py
new file mode 100644
index 0000000..6b4a300
--- /dev/null
+++ b/backend/logs.py
@@ -0,0 +1,45 @@
+"""
+Patch the uvicorn, watchgod, and global loggers.
+"""
+import logging
+import sys
+from logging import handlers
+from pathlib import Path
+
+from backend import constants
+
+# Setup constants
+LOGGING_LEVEL = logging.INFO if constants.PRODUCTION else logging.DEBUG
+FORMATTER = logging.Formatter("%(asctime)s | %(name)s | %(levelname)s | %(message)s")
+
+# Setup the project logger
+handler = logging.StreamHandler(sys.stdout)
+handler.setFormatter(FORMATTER)
+
+logger = logging.getLogger("backend")
+logger.setLevel(LOGGING_LEVEL)
+logger.addHandler(handler)
+
+# Format uvicorn logging
+try:
+    logging.getLogger("uvicorn").handlers[0].setFormatter(FORMATTER)
+except KeyError:
+    logger.warning("Could not patch uvicorn logger, continuing.")
+
+# Add file handlers for local development
+if constants.LOG_FILES:
+    # Setup uvicorn handler
+    uvicorn_log = Path("logs", ".uvicorn.log")
+    uvicorn_log.parent.mkdir(exist_ok=True)
+    # Store two copies of 100KB Files
+    uvicorn_handler = handlers.RotatingFileHandler(uvicorn_log, maxBytes=100000, backupCount=1)
+    uvicorn_handler.setFormatter(FORMATTER)
+
+    # Setup app handler
+    backend_log = Path("logs", ".backend.log")
+    file_handler = logging.FileHandler(backend_log)
+    file_handler.setFormatter(FORMATTER)
+
+    # Add all handlers
+    logging.getLogger("uvicorn").addHandler(uvicorn_handler)
+    logger.addHandler(file_handler)
-- 
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