Get the exception easily with Azure app insight using python flask

Question

I had tried the code below for getting the exception in https://learn.microsoft.com/en-us/azure/azure-monitor/app/opencensus-python


from opencensus.ext.azure.log_exporter import AzureLogHandler

logger = logging.getLogger(__name__)
# TODO: replace the all-zero GUID with your instrumentation key.
logger.addHandler(AzureLogHandler(
    connection_string='InstrumentationKey=00000000-0000-0000-0000-000000000000')
)

properties = {'custom_dimensions': {'key_1': 'value_1', 'key_2': 'value_2'}}

# Use properties in exception logs
try:
    result = 1 / 0  # generate a ZeroDivisionError
except Exception:
    logger.exception('Captured an exception.', extra=properties)

It is working. I can catch the exception. However, I want to ask if there is an easy way to catch the exception automatically in the python flask? Since I try the below code, it just gives me a request record, not the exception.

        app = Flask(__name__)
        app.logger.addHandler(file_handler)
        handler = AzureEventHandler(
            connection_string="InstrumentationKey={}".format(app.config['APPINSIGHTS_INSTRUMENTATIONKEY']))
        handler.setFormatter(logging.Formatter(
            '%(asctime)s %(levelname)s: %(message)s '
            '[in %(pathname)s:%(lineno)d]'))
        handler.setLevel(logging.ERROR)
        app.logger.addHandler(handler)

Thank you for helping

If my reply is helpful, please accept it as answer(click on the mark option beside the reply to toggle it from greyed out to fill in.), see https://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work — Jason Pan, Apr 23 '21 at 03:58
Does my answer useful to you? If you need further help ,pls let me know. — Jason Pan, Apr 26 '21 at 05:41

score 2 · Accepted Answer · answered Apr 23 '21 at 01:42

Your code should like below. For more details, you can check offical sample code.

Flask "To-Do" Sample Application

import logging
import sys

from flask import Flask

sys.path.append('..')
from config import Config
from flask_sqlalchemy import SQLAlchemy
from opencensus.ext.azure import metrics_exporter
from opencensus.ext.azure.log_exporter import AzureLogHandler
from opencensus.ext.flask.flask_middleware import FlaskMiddleware
from opencensus.trace import config_integration

logger = logging.getLogger(__name__)
app = Flask(__name__)
app.config.from_object(Config)

db = SQLAlchemy(app)

# Import here to avoid circular imports
from app import routes  # noqa isort:skip

# Trace integrations for sqlalchemy library
config_integration.trace_integrations(['sqlalchemy'])

# Trace integrations for requests library
config_integration.trace_integrations(['requests'])

# FlaskMiddleware will track requests for the Flask application and send
# request/dependency telemetry to Azure Monitor
middleware = FlaskMiddleware(app)

# Processor function for changing the role name of the app
def callback_function(envelope):
    envelope.tags['ai.cloud.role'] = "To-Do App"
    return True

# Adds the telemetry processor to the trace exporter
middleware.exporter.add_telemetry_processor(callback_function)

# Exporter for metrics, will send metrics data
exporter = metrics_exporter.new_metrics_exporter(
    enable_standard_metrics=False,
    connection_string='InstrumentationKey=' + Config.INSTRUMENTATION_KEY)

# Exporter for logs, will send logging data
logger.addHandler(
    AzureLogHandler(
        connection_string='InstrumentationKey=' + Config.INSTRUMENTATION_KEY
        )
    )


if __name__ == '__main__':
    app.run(host='localhost', port=5000, threaded=True, debug=True)

Get the exception easily with Azure app insight using python flask

1 Answers1