Service bus not triggering on Azure, working locally

Question

I am unable to get my Azure Function to trigger when hosted on azure, using azure service bus queues as a trigger. It works fine when its run locally, but doesn't remotely.

function.json

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "msg",
      "type": "serviceBusTrigger",
      "direction": "in",
      "AzureWebJobsStorage": "AzureWebJobsStorage",
      "queueName": "selectivitycalculation",
      "connection":  "AzureServiceBusConnectionString"
    }
  ]
}

local.settings.json

{
  "IsEncrypted": false,
  "Values": {
    "FUNCTIONS_WORKER_RUNTIME": "python",
    "AzureWebJobsStorage": XXXXXX,
    "AzureServiceBusConnectionString": XXXXXXX
  }
}

host.json

{
    "version": "2.0",
    "extensions": {
        "serviceBus": {
            "prefetchCount": 100,
            "messageHandlerOptions": {
                    "autoComplete": false,
                    "maxConcurrentCalls": 32,
                    "maxAutoRenewDuration": "00:55:00"
            }
        }
    },
    "extensionBundle": {
        "id": "Microsoft.Azure.Functions.ExtensionBundle",
        "version": "[1.*, 2.0.0)"
    },
    "functions": [ "SelectivityCalculation" ],
    "logging": {
        "fileLoggingMode": "debugOnly",
        "logLevel": {
          "Function.MyFunction": "Information",
          "default": "None"
        },
        "applicationInsights": {
            "samplingSettings": {
              "isEnabled": true,
              "maxTelemetryItemsPerSecond" : 20
            }
        }
    }
}

__init__.py

import azure.functions as func
import logging
import sys
from .azure_functions_controller import selectivity_callback

def main(msg: func.ServiceBusMessage):
    logger.info('Python ServiceBus queue trigger processed message.')
    print('working')
    selectivity_callback(msg.get_body())

Folder Structure

Calculator
 | - __app__
 | | - SelectivityCalculation
 | | | - __init__.py
 | | | - azure_functions_controller.py
 | | | - functions.json
 | | - SharedCode
 | | | - ...
 | | - host.json
 | | - bin

And my application settings on Azure

My dev environment is as follows:

1) Windows 10 Pro 2) VS Code 1.41.1 3) Azure Functions CLI 2.7.1948 4) Python 3.7.4

I have the same issue as I've added PrefetchCount to host.json. — Marco

Cindy Pau Cindy Pau · Accepted Answer · 2020-01-09T07:04:18

Have you remember to upload Function Settings file to Azure?

At least you need these settings to make the Function run fine:

[
  {
    "name": "APPINSIGHTS_INSTRUMENTATIONKEY",
    "value": "xxxxxxxxxxxxxxxx",
    "slotSetting": false
  },
  {
    "name": "AzureWebJobsStorage",
    "value": "xxxxxxxxxxxxxxxx",
    "slotSetting": false
  },
  {
    "name": "bowmantest_SERVICEBUS",
    "value": "xxxxxxxxxxxxxxxx",
    "slotSetting": false
  },
  {
    "name": "BUILD_FLAGS",
    "value": "UseExpressBuild",
    "slotSetting": false
  },
  {
    "name": "ENABLE_ORYX_BUILD",
    "value": "true",
    "slotSetting": false
  },
  {
    "name": "FUNCTIONS_EXTENSION_VERSION",
    "value": "~2",
    "slotSetting": false
  },
  {
    "name": "FUNCTIONS_WORKER_RUNTIME",
    "value": "python",
    "slotSetting": false
  },
  {
    "name": "SCM_DO_BUILD_DURING_DEPLOYMENT",
    "value": "1",
    "slotSetting": false
  },
  {
    "name": "XDG_CACHE_HOME",
    "value": "/tmp/.cache",
    "slotSetting": false
  }
]

Given that you are working well locally, I suspect it is because you did not upload a configuration file. If my Application Settings only has three settings from your screenshot, then my Function will not display anything when it is triggered.

Service bus not triggering on Azure, working locally

2 Answers