feat: log to file

.env.example

@@ -10,6 +10,9 @@ SELECTOR_TYPE=xpath
 # Cache file location (stores the hash of previous content)
 CACHE_FILE=.cache/hash.txt
 
+# Optional: Log file path (leave empty to only log to console)
+LOG_FILE=.logs/alert.log
+
 # SMTP Email Configuration
 SMTP_HOST=smtp.gmail.com
 SMTP_PORT=587

.gitignore

@@ -214,3 +214,4 @@ __marimo__/
 # ----------------------------------
 
 .env
+.logs

alert.py

@@ -7,6 +7,7 @@ Supports optional XPath/CSS selectors for monitoring specific page sections.
 
 import hashlib
 import logging
+import logging.handlers
 import smtplib
 import sys
 from email.mime.multipart import MIMEMultipart
@@ -128,13 +129,40 @@ def send_email(
 
 def main() -> int:
     """Main execution function."""
-    # Logging to INFO
-    logging.basicConfig(level=logging.INFO, format="[%(asctime)s] %(levelname)s: %(message)s")
-
     # Load configuration from environment
     env = Env()
     env.read_env()
 
+    # Configure logging
+    log_format = "[%(asctime)s] %(levelname)s: %(message)s"
+    log_level = logging.INFO
+
+    # Get log file path from environment (optional)
+    log_file = env.str("LOG_FILE", default=None)
+
+    # Setup logging handlers
+    handlers = []
+
+    # Always add console handler
+    console_handler = logging.StreamHandler()
+    console_handler.setFormatter(logging.Formatter(log_format))
+    handlers.append(console_handler)
+
+    # Add file handler if log file is configured
+    if log_file:
+        log_path = Path(log_file)
+        log_path.parent.mkdir(parents=True, exist_ok=True)
+        file_handler = logging.handlers.RotatingFileHandler(
+            log_path,
+            maxBytes=10 * 1024 * 1024,  # 10 MB
+            backupCount=5
+        )
+        file_handler.setFormatter(logging.Formatter(log_format))
+        handlers.append(file_handler)
+
+    # Configure root logger
+    logging.basicConfig(level=log_level, format=log_format, handlers=handlers, force=True)
+
     url = env.str("URL")
     selector = env.str("SELECTOR", default=None)
     selector_type = env.str("SELECTOR_TYPE", default="xpath")