How to check Azure function is running on local en

Question

I have a condition in code where i need to check if current environment is not local.i have used !RoleEnvironment.IsEmulated, now this is not working in Azure functions but works in Cloud service. Same code is Shared in Cloud service also, so solution should work with cloud service and azure functions.

how can i check current environment is local not hosted/deployed?

Answer 1

Based on answer by Fabio Cavalcante, here is a working Azure function that checks the current running environment (local or hosted):

using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Azure.WebJobs.Host;
using System;

namespace AzureFunctionTests
{
    public static class WhereAmIRunning
    {
        [FunctionName("whereamirunning")]
        public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
        {
            bool isLocal = string.IsNullOrEmpty(Environment.GetEnvironmentVariable("WEBSITE_INSTANCE_ID"));

            string response = isLocal ? "Function is running on local environment." : "Function is running on Azure.";

            return req.CreateResponse(HttpStatusCode.OK, response);
        }
    }
}

Answer 2

You can use an approach similar to what the actual runtime uses to identify whether it is running on Azure: https://github.com/Azure/azure-webjobs-sdk-script/blob/efb55da/src/WebJobs.Script/Config/ScriptSettingsManager.cs#L25

In this case, the runtime checks for the presence of an app setting named WEBSITE_INSTANCE_ID

Answer 3

You can use the AZURE_FUNCTIONS_ENVIRONMENT environment variable, which is set automatically:

Environment.GetEnvironmentVariable("AZURE_FUNCTIONS_ENVIRONMENT"); // set to "Development" locally

https://github.com/Azure/azure-functions-host/issues/4491