How to read azure function live logs programmatically?

Kolhar, Rajratan (SHS TE DC IND DI-DH TPF DPL) 1

I have a function which does some internal job and logs the status using Microsoft.Extensions.Logging.ILogger.

I want to read the live logs of it for testing purpose using C#

How can I do that?

I have also setup the ApplicationInsight for the function and I'm able to see the live logs in Live Metrics, But I want to read it programmatically.

Can anyone help me here?

1 answer

Mike Urnun 9,811 Reputation points Microsoft Employee

2020-10-16T20:53:10.177+00:00
Hello @Kolhar, Rajratan (SHS TE DC IND DI-DH TPF DPL) It doesn't seem possible at this time to retrieve the data generated in Live Metrics programmatically, please see:

Allow access to Live Metric Stream data feed for building custom visualizations

Retrieve Azure AppInsights Live Metrics through API By design, the data is short-lived per session basis in Azure Portal only. Although this doesn't necessarily mean that your scenario is impossible. Could you elaborate on what kind of testing you're attempting to implement and what the end-goal is? There may be other ways to approach it :)
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Kolhar, Rajratan (SHS TE DC IND DI-DH TPF DPL) 1 Reputation point

2020-10-19T07:21:52.15+00:00

Hello @Mike Urnun
I'm trying to do E2E testing for my function app.
whenever a valid event (Lets say X) occurs my function does some job. And whenever an invalid scenario occurs (Lets say Y) my function doesn't do anything instead if just logs a message saying "Y is invalid, Hence not doing anything!!!"

So as a part of E2E, I want to have an automated testcase which covers invalid scenarios too. In order to do that, I want to trigger invalid event as Given part (Gherkin) and as part of Assertion, I want to see whether the message is logged by function or not.

PS: I know I can do that by using any of the azure resources (Queue, blob etc) by logging the message to that resource and as part of assertion, I can check that resource. But I want to know whether there is any way to directly fetch the live function logs/live metric logs.

Mike Urnun 9,811 Reputation points Microsoft Employee

2020-10-19T21:28:24.297+00:00

Hi @Kolhar, Rajratan (SHS TE DC IND DI-DH TPF DPL) I see but since it's not possible with Live Metrics of App Insights at this time, I believe you can try the Built-in Log Streaming service in App Service and fetch the data programmatically from the kudu endpoint: https://{sitename}.scm.azurewebsites.net/api/logstream/application

More info is here: Diagnostic Log Stream

Mike Urnun 9,811 Reputation points Microsoft Employee

2020-10-20T21:05:50.06+00:00

Hi @Kolhar, Rajratan (SHS TE DC IND DI-DH TPF DPL) - Just following up on my comment above, please let me know if you had any further questions regarding this matter. Thanks!
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How to read azure function live logs programmatically?

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