C#•11mo ago

No error log - app quits (async problem?)

Hey, I am working on an app that has multiple background workers:

List<Tasks> tasks = [];
foreach (var item in items)
{ 
    // Could be I am doing this wrong? I am learning async as I go
    tasks.Add(Task
        .Run(async () => await StepOne(foo))
        .ContinueWith(async x => await StepTwo(boo));
} 

await Task.WhenAll(tasks);
// End app

List<Tasks> tasks = [];
foreach (var item in items)
{ 
    // Could be I am doing this wrong? I am learning async as I go
    tasks.Add(Task
        .Run(async () => await StepOne(foo))
        .ContinueWith(async x => await StepTwo(boo));
} 

await Task.WhenAll(tasks);
// End app

StepOne works correctly, in StepTwo I am calling OpenAI API via this NuGet (https://github.com/OkGoDoIt/OpenAI-API-dotnet).

// OAI is just wrapper around OpenAPI NuGet
await OAI.Service.TextToSpeech.SaveSpeechToFileAsync(new TextToSpeechRequest()
{
    Input = "Lorem ipsum",
    ResponseFormat = ResponseFormats.MP3,
    Model = Model.TTS_HD,
    Voice = Voices.Shimmer,
    Speed = 1.1,
}, outputFile);

// OAI is just wrapper around OpenAPI NuGet
await OAI.Service.TextToSpeech.SaveSpeechToFileAsync(new TextToSpeechRequest()
{
    Input = "Lorem ipsum",
    ResponseFormat = ResponseFormats.MP3,
    Model = Model.TTS_HD,
    Voice = Voices.Shimmer,
    Speed = 1.1,
}, outputFile);

On this line my app (Console application) just turns off - no error log, nothing. So I tried doing try-catch block - nothing. I debugged and figured out problem is here (L133): https://github.com/OkGoDoIt/OpenAI-API-dotnet/blob/5f7c23a928be39da87e89d5105a044ecb7401727/OpenAI_API/EndpointBase.cs#L133 It's being called with following:

req: {Method: POST, RequestUri: 'https://api.openai.com/v1/audio/speech', Version: 1.1, Content: System.Net.Http.StringContent, Headers:
{
  Content-Type: application/json; charset=utf-8
}}
streaming: false

req: {Method: POST, RequestUri: 'https://api.openai.com/v1/audio/speech', Version: 1.1, Content: System.Net.Http.StringContent, Headers:
{
  Content-Type: application/json; charset=utf-8
}}
streaming: false

Seems to be correct (calling other endpoint with same NuGet - e.g. chat completion works) I cloned the repo, put try-catch block around that line - still nothing. When trying to debug the HttpClient method my debugger is just jumping all around place without sense. I guess I would have to get the code of HttpClient locally and do it like that - but at that point I am wondering. Anyone has idea why this is happening? I expect it's because of how I use Tasks? I am clueless here, not getting any output or error anywhere :/

10 Replies

NatroOP•11mo ago

The reason was in fact using Task.Run instead of just putting awaits after each other. Why though?

Angius•11mo ago

Also, that ContinueWith()... Can't be sure that is the issue, but

foreach (var item in items)
{ 
    // Could be I am doing this wrong? I am learning async as I go
    tasks.Add(Task
        .Run(async () => await StepOne(foo))
        .ContinueWith(async x => await StepTwo(boo));
}

foreach (var item in items)
{ 
    // Could be I am doing this wrong? I am learning async as I go
    tasks.Add(Task
        .Run(async () => await StepOne(foo))
        .ContinueWith(async x => await StepTwo(boo));
}

can just be

foreach (var item in items)
{ 
    // Could be I am doing this wrong? I am learning async as I go
    tasks.Add(async () => {
        await StepOne(foo);
        await StepTwo(boo);
    });
}

foreach (var item in items)
{ 
    // Could be I am doing this wrong? I am learning async as I go
    tasks.Add(async () => {
        await StepOne(foo);
        await StepTwo(boo);
    });
}

NatroOP•11mo ago

Yeah, I figured I am doing something wrong the moment I used ContinueWith and had no clue what the 'x' is for I assume I can pass stuff from prev task?

Angius•11mo ago

Yep Basically,

Foo().ContinueWith(num => Bar(num));

Foo().ContinueWith(num => Bar(num));

is the pre-async version of

var num = await Foo();
Bar(num);

var num = await Foo();
Bar(num);

NatroOP•11mo ago

Oh that makes sense. Thank you 🙂 Do you know why the errors were not logged though?

Angius•11mo ago

¯\_(ツ)_/¯ With async code, it usually happens when something's fucky-wucky with that, like not awaiting a task or something But everything seems fine at a glance

NatroOP•11mo ago

Yeah, the only thing I changed was the continue with to await and it works now. Fun times

Angius•11mo ago

There you go lol Unfortunately, C# has its fair share of old APIs like that that should not be sued anymore Non-generic collections, WebClient, etc There's a nice analyzer, BannedSymbolsAnalyzer I believe it's called, that can help you ban anything you don't want from the code

NatroOP•11mo ago

Will check it out, thank you

Angius•11mo ago

https://github.com/dotnet/roslyn-analyzers/blob/main/src/Microsoft.CodeAnalysis.BannedApiAnalyzers/BannedApiAnalyzers.Help.md

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No error log - app quits (async problem?)