Azure function working in local but not after uploading to azure

Question

I'm new with azure functions and azure as whole.

I'm using azure functions for interacting with a SignalR service for usage in a xamarin forms app. I borrowed the azure function code from docs.MSDocs on serverless signalR service

Worked well in local (tested the web client provided in the docs, And also a simple console app).

But when the function was moved to azure. Initially I faced CORS error fixed those and then faced 502. Could not debug or find the root cause. After few hours of browsing found that azure itself provides a template for signalR serverless connection.

Used the template, configured the app settings with signalR endpoints (I have set the app setting for AzureSignalRConnectionString).

Still facing 502 error, . How can I get it to work? Or How do I find out the root cause for the failure.

Negotiate function code:

index.js

module.exports = async function (context, req, connectionInfo) {
    context.res.body = connectionInfo;
};

Function.json

{
  "bindings": [
    {
      "authLevel": "anonymous",
      "type": "httpTrigger",
      "direction": "in",
      "methods": [
        "post"
      ],
      "name": "req"
    },
    {
      "type": "http",
      "direction": "out",
      "name": "res"
    },
    {
      "type": "signalRConnectionInfo",
      "name": "connectionInfo",
      "hubName": "messaage",
      "connectionStringSetting": "AzureSignalRConnectionString",
      "direction": "in"
    }
  ]
}

did you add AzureSignalRConnectionString in azure portal ? – NAS Mar 04 '21 at 19:02 — NAS, Mar 04 '21 at 19:02
S I did ADD it to the portal. @NAS – Nikhileshwar Mar 05 '21 at 00:47 — Nikhileshwar, Mar 05 '21 at 00:47

score 2 · Accepted Answer · answered Mar 05 '21 at 05:37

2

SignalR Service needs a URL to access Function App when you're using SignalR Service trigger binding. The URL format: <Function_App_URL>/runtime/webhooks/signalr?code=<API_KEY>. Explanation: The Function_App_URL can be found on Function App's Overview page and The API_KEY is generated by Azure Function. You can get the API_KEY from signalr_extension in the App keys blade of Function App.

And if you are very new to this, here is a step by step article to follow: https://github.com/aspnet/AzureSignalR-samples/tree/master/samples/BidirectionChat

answered Mar 05 '21 at 05:37

Doris Lv

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Thanks for the detailed explanation. I'll check this and let you know. – Nikhileshwar Mar 05 '21 at 05:42
Have you solve your problem? @Error280MonkeyFound – Doris Lv Mar 10 '21 at 01:15
Hi, yes I solved my issue by completely removing my azure functions and recreating them. Earlier function app had a runtime error. Something was messed up in that app, as I used both portal and vs code to publish functions. – Nikhileshwar Mar 10 '21 at 04:08

Azure function working in local but not after uploading to azure

1 Answers1