Hello,
Yes, you can definitely enhance your Dash application’s logging to include the callback function’s name and execution time. To achieve this, you’ll need to customize the Dash server’s request handling and integrate logging within your callback functions.
Here’s how you can modify your app.py to achieve the desired logging output:
Python
import dash
from dash import html, Input, Output
import logging
import time
from flask import request
Configure logging
logging.basicConfig(level=logging.INFO, format=‘%(asctime)s - %(levelname)s - %(message)s’)
logger = logging.getLogger(name)
app = dash.Dash(name)
app.layout = html.Div([
html.Button(‘Click Me’, id=‘my-button’),
html.Div(id=‘output-div’)
])
@app.callback(
Output(‘output-div’, ‘children’),
Input(‘my-button’, ‘n_clicks’)
)
def my_callback_func(n_clicks):
start_time = time.time()
if n_clicks is None:
return “Click the button”
time.sleep(0.5) # Simulate some processing time
end_time = time.time()
execution_time_ms = int((end_time - start_time) * 1000)
# Log the request details
logger.info(f"{request.remote_addr} - - [{time.strftime('%d/%b/%Y %H:%M:%S')}] \"POST /_dash-update-component HTTP/1.1\" 200 - {my_callback_func.__name__} - {execution_time_ms}ms")
return f"Button clicked {n_clicks} times. Callback executed in {execution_time_ms}ms"
if name == ‘main’:
app.run_server(debug=True)
Explanation:
Import Necessary Modules:
logging for logging functionality.
time for measuring execution time.
flask.request to access request details.
Configure Logging:
logging.basicConfig() sets up basic logging with a timestamp, log level, and message format.
logger = logging.getLogger(name) creates a logger instance.
Callback Function Modification: SunPass
start_time = time.time() records the start time of the callback execution.
time.sleep(0.5) simulates some processing time. Replace this with your actual callback logic.
end_time = time.time() records the end time.
execution_time_ms calculates the execution time in milliseconds.
Logging the Request Details:
logger.info(…) logs the request details, including:
request.remote_addr (client IP address).
Timestamp.
Request method and URL.
HTTP status code (200).
my_callback_func.name (name of the callback function).
execution_time_ms (execution time in milliseconds).
Key improvements:
Callback Function Name: The my_callback_func.name attribute retrieves the name of the callback function.
Execution Time: The execution time is calculated and included in the log message, providing valuable performance insights.
Request Details: The log message includes the client IP address, timestamp, request method, URL, and HTTP status code, giving you a more complete picture of the request.
Clear Log Format: The log format is customized to include all the desired information in a readable format.
Important Notes:
Best Regards