Events are not sent in AWS Lambda (ASP.NET Core Web API) .

Hi guys.

As far as AWS lambda freezes all background threads right after returning results, exceptionless is not working, seems to be because of Timers also get frozen.

 [
  {
    "date": "2019-08-19T14:47:33.2301596+00:00",
    "level": {
      "name": "Trace",
      "ordinal": 0
    },
    "source": "DefaultEventQueue",
    "message": "Processing queue...",
    "exception": null
  },
  {
    "date": "2019-08-19T14:47:23.0338945+00:00",
    "level": {
      "name": "Info",
      "ordinal": 2
    },
    "source": "DefaultEventQueue",
    "message": "Sent 1 events to \"https://collector.exceptionless.io\".",
    "exception": null
  },
  {
    "date": "2019-08-19T14:43:09.9984337+00:00",
    "level": {
      "name": "Trace",
      "ordinal": 0
    },
    "source": "DefaultEventQueue",
    "message": "Processing queue...",
    "exception": null
  },
  {
    "date": "2019-08-19T14:42:43.3919108+00:00",
    "level": {
      "name": "Trace",
      "ordinal": 0
    },
    "source": "ExceptionlessClient",
    "message": "Submitting event: type=log",
    "exception": null
  },
  {
    "date": "2019-08-19T14:42:43.3906358+00:00",
    "level": {
      "name": "Trace",
      "ordinal": 0
    },
    "source": "DuplicateCheckerPlugin",
    "message": "Enqueueing event with hash: 5055887 to cache.",
    "exception": null
  },
  {
    "date": "2019-08-19T14:42:43.3903982+00:00",
    "level": {
      "name": "Trace",
      "ordinal": 0
    },
    "source": "DuplicateCheckerPlugin",
    "message": "Checking event: Unknown error responding to request: InvalidOperationException:\nSystem.InvalidOperationException: It is our exception that we throw to test\n   at My.Api.Controllers.ValuesController.Get(Int32 id) with hash: 5055887",
    "exception": null
  },
  {
    "date": "2019-08-19T14:42:41.9262751+00:00",
    "level": {
      "name": "Trace",
      "ordinal": 0
    },
    "source": "DefaultEventQueue",
    "message": "Processing queue...",
    "exception": null
  }
]

2019-08-19T14:47:23.0338945+00:00 I invoked Lambda with a parameter that triggers ProcessQueue() method.

See: related

You could call ProcessQueue inside of here:

context.Response.OnCompleted(() =>
{
// Perform slow code here.
return Task.CompletedTask;
});

or on the last line of your function. Did that solve it?

I've tried these two variants. Both of them responds only when the whole code executes, including part in OnCompleted block.

[HttpGet("{id}")]
public IActionResult Get(int id) {
	this.HttpContext.Response.OnCompleted(() => {
	     Startup.ExceptionlessClient.ProcessQueue();
	     for (long i = 0; i <= 8000000000; i++) {
	     }
	return Task.CompletedTask;
     });	
     return Ok("exit ok");
}

[HttpGet("{id}")]
public IActionResult Get(int id) {
	this.HttpContext.Response.OnCompleted(() => {
		return Task.WhenAll(Startup.ExceptionlessClient.ProcessQueueAsync(), Task.Delay(20000));
		});
return Ok("exit ok");
}

The inner for loop won't do anything because the compiler will remove it. You'd be better to just call ProcessQueueAsync and await it otherwise a deadlock could occur. Were you able to get any further on this issue?

Were you able to get any further on this issue?

Unfortunately, no. Just thought we need some very lightweight client.

What happens if you call ExceptionlessClient.Default.Startup() in your app. Does it always report the events?

We just made some huge improvements to our ASP.NET Core client to better support functions. Can you please upgrade to https://github.com/exceptionless/Exceptionless.Net/releases/tag/v4.6.2 and let us know if you run into any issues.

Take a look at these sample apps as well:

https://github.com/exceptionless/Exceptionless.Net/tree/master/samples/Exceptionless.SampleLambda

https://github.com/exceptionless/Exceptionless.Net/tree/master/samples/Exceptionless.SampleLambdaAspNetCore

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Events are not sent in AWS Lambda (ASP.NET Core Web API) . #215

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Events are not sent in AWS Lambda (ASP.NET Core Web API) . #215

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niemyjski commented on Aug 19, 2019

hmvs commented on Aug 20, 2019

niemyjski commented on Sep 20, 2019

niemyjski commented on Jan 16, 2020

hmvs commented on Feb 20, 2020

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niemyjski commented on Jan 10, 2021

ejsmith commented on Jan 12, 2021

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