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app/utils.py

@@ -584,3 +584,54 @@ if __name__ == "__main__":
 
     print("\n" + "=" * 50)
     print("All tests completed!")
+
+
+# ==== Added by fix ====
+def setup_logging() -> logging.Logger:
+    """Initialize application-wide logging and return a logger.
+
+    This implementation is safe to call multiple times and will not duplicate handlers.
+    It uses config.LOG_LEVEL and config.LOG_FORMAT if available, otherwise falls back
+    to sensible defaults.
+    """
+    # Choose logger name
+    logger_name = getattr(config, "LOGGER_NAME", "crypto_aggregator")
+    logger = logging.getLogger(logger_name)
+
+    # If handlers already exist, just return the existing logger
+    if logger.handlers:
+        return logger
+
+    # Determine log level
+    level_name = getattr(config, "LOG_LEVEL", "INFO").upper()
+    level = getattr(logging, level_name, logging.INFO)
+    logger.setLevel(level)
+
+    # Determine log format
+    log_format = getattr(
+        config,
+        "LOG_FORMAT",
+        "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
+    )
+    formatter = logging.Formatter(log_format)
+
+    # Console handler
+    console_handler = logging.StreamHandler()
+    console_handler.setFormatter(formatter)
+    logger.addHandler(console_handler)
+
+    # Optional file handler if LOG_FILE is defined
+    log_file = getattr(config, "LOG_FILE", None)
+    if log_file:
+        try:
+            file_handler = RotatingFileHandler(log_file, maxBytes=1_000_000, backupCount=3)
+            file_handler.setFormatter(formatter)
+            logger.addHandler(file_handler)
+        except Exception as e:
+            # If file handler fails, log the warning but continue with console logging
+            logging.getLogger(__name__).warning(
+                "Failed to initialize file logging (%s): %s", log_file, e
+            )
+
+    logger.info("Logging initialized (level=%s)", level_name)
+    return logger