Using ILogger in Azure durable function activity?

Question

I am using the azure functions for a table insert event trigger, specifically the durable functions, and I'm trying to to produce some logs in my activity function.

The problem is that the activity function does not receive any "ILogger", nor does the orchestrator, thus I don't have any access and cannot produce logs for debug.

The overall flow is:

HTTP request => Duarble HTTP starter => Durable functions orchestrator => Durable function activity.

Is there a way to create a logger instance for some class deriving from ILogger? Or perhaps a way to pass the ILogger instance from the HTTP starter down to the activity function?

Any solution would be much appreciated!

Community · Accepted Answer · 2020-06-20 09:12:55Z

6

By default the ILogger instance is injected in your functions, unless you are using DI.

All you need to do is Use the ILogger which is injected into your functions. Example:

[FunctionName("Demo")]
public async static Task RunOrchestrator(
    [OrchestrationTrigger] DurableOrchestrationContext context,
    ILogger log)
{
    log.LogInformation("Starting Orchestration function");
}

Incase if you using Dependency injection you should just do the below in your startup builder.Services.AddLogging();

More Information :

https://github.com/Azure/azure-functions-host/issues/4858

https://github.com/Azure/azure-functions-host/issues/2720#issuecomment-503627355

Microsoft Docs

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Sep 2, 2019 at 4:36

HariHaran

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7 Comments

Martin Over a year ago

By default the ILogger isn't injected in the Durable activity function. (It is howerver in the orchestration), so where should the "builder.Services.AddLogging()" be added?

HariHaran Over a year ago

Inorder to use builder.Services.AddLogging() you will need to add Statup class and make the function as dependency injected one

Billy Ray Valentine Over a year ago

@HariHaran I've implemented DI for durable functions as well but the line above does not seem to work. Can't inject an ILogger via the function or the constructor? Any ideas?

HariHaran Over a year ago

@BillyRayValentine please raise a question with more error info,i'll check it out.

Billy Ray Valentine Over a year ago

Hi @HariHaran, please see question here: stackoverflow.com/questions/58752340/…

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