Update mark_price.py

examples/rest_api/market/mark_price.py

@@ -1,8 +1,59 @@
+# spot_price_fetcher.py
+
 import logging
-from aster.rest_api import Client
+import sys
+from aster.rest_api import Client as AsterClient  # Renaming Client to avoid confusion
 from aster.lib.utils import config_logging
+from aster.lib.errors import APIError, ConnectionError
+
+# Define constants for clarity and easy modification
+SYMBOL = "BTCUSDT"
+LOG_LEVEL = logging.DEBUG
+
+
+def fetch_and_log_mark_price(client: AsterClient, symbol: str) -> None:
+    """
+    Fetches the mark price for a given trading symbol using the Aster client
+    and logs the result or any encountered errors.
+
+    Args:
+        client: An initialized instance of the Aster REST API Client.
+        symbol: The trading pair symbol (e.g., "BTCUSDT").
+    """
+    try:
+        # Attempt to retrieve the mark price for the specified symbol.
+        mark_price_data = client.mark_price(symbol)
+        logging.info("Successfully retrieved mark price for %s: %s", symbol, mark_price_data)
+
+    except (APIError, ConnectionError) as e:
+        # Catch specific exceptions related to API interaction or network issues.
+        logging.error("Failed to fetch mark price for %s. Error: %s", symbol, e)
+    except Exception as e:
+        # Catch any other unexpected exceptions.
+        logging.critical("An unexpected error occurred during price fetching: %s", e)
+
+
+if __name__ == "__main__":
+    # 1. Configure logging system.
+    # We configure logging inside the main execution block.
+    try:
+        config_logging(logging, LOG_LEVEL)
+        logging.debug("Logging initialized at %s level.", logging.getLevelName(LOG_LEVEL))
+    except Exception as e:
+        print(f"FATAL: Could not configure logging. Error: {e}", file=sys.stderr)
+        sys.exit(1)
+
+
+    # 2. Initialize the client.
+    # Note: Ensure that the API keys (if required) are configured correctly
+    # via environment variables or a configuration file that 'Client()' expects.
+    try:
+        client = AsterClient()
+        logging.info("Aster REST API Client initialized.")
+    except Exception as e:
+        logging.critical("Failed to initialize Aster client. Check configuration. Error: %s", e)
+        sys.exit(1)
 
-config_logging(logging, logging.DEBUG)
 
-client = Client()
-logging.info(client.mark_price("BTCUSDT"))
+    # 3. Execute the core logic.
+    fetch_and_log_mark_price(client, SYMBOL)