Attachment length is always 0

[bagusnl]

Hi, I'm working on SentrySDK integration for our project, and when trying to upload the application log to the Sentry-compatible self-hosted DSN (tried both bugsink and glitchtip) but the attachment length seems to be always 0. This leads to the attachment not shown in the dashboard and in the case for GlitchTip, a BadRequest error.

Tried to use both global scope, local scope, copying the log file to temporary folder, using StreamReader, etc but it seems to always do the same thing.
Sender snippet example

            SentrySdk.ConfigureScope(s =>
            {
                s.AddAttachment(LoggerBase.LogPath, AttachmentType.Default, "text/plain");
            });

where LogPath contains the path to the current log where the app is using. I do believe that this is correct since Sentry debug console does not show any errors before sending the envelope.

Debug message

[Sentry]    Sentry event caught! ID: 898aac16b7824effaa048bcce3a2f6db, Level: Error

  Debug: Ending session as Crashed, due to unhandled exception.
   Info: Ended session (SID: 125a7b4cb6754d3796c66d514855f8de; DID: a0d2095d-77f4-4121-91ee-1cb541a43ac3) with status 'Crashed'.
  Debug: Deleting persisted session file with contents: {"update":{"sid":"125a7b4cb6754d3796c66d514855f8de","did":"a0d2095d-77f4-4121-91ee-1cb541a43ac3","init":true,"started":"2024-11-12T21:01:28.7803595+07:00","timestamp":"2024-11-12T14:01:28.781261+00:00","seq":0,"duration":0,"errors":0,"attrs":{"release":"[email protected]\u002B325e4d73d25d70a87b4f42b59848240f01d4bd28","environment":"debug"}}}
   Info: Deleted persisted session file 'C:\Users\bagusnl\AppData\LocalLow\CollapseLauncher\_SentryCache\Sentry\CAF5A941A32B9D83162232D9AB8F9CBCC023861C\.session'.
  Debug: Event not sampled.
  Debug: Enqueuing envelope 898aac16b7824effaa048bcce3a2f6db
   Info: Envelope queued up: '898aac16b7824effaa048bcce3a2f6db'
  Debug: Tracking depth: 1.
  Debug: Storing file C:\Users\bagusnl\AppData\LocalLow\CollapseLauncher\_SentryCache\Sentry\CAF5A941A32B9D83162232D9AB8F9CBCC023861C\1731420106_-6636_898aac16b7824effaa048bcce3a2f6db_58448818.envelope.
  Debug: Envelope handed off to transport (event ID: '898aac16b7824effaa048bcce3a2f6db'). 1 items in queue.
  Debug: CachingTransport worker signal triggered.
  Debug: De-queueing event 898aac16b7824effaa048bcce3a2f6db
  Debug: Flushing cached envelopes.
  Debug: Signaling flush completed.
  Debug: Successfully flushed all events up to call to FlushAsync.
  Debug: Flushing caching transport with remaining flush time.
  Debug: Reading cached envelope: C:\Users\bagusnl\AppData\LocalLow\CollapseLauncher\_SentryCache\Sentry\CAF5A941A32B9D83162232D9AB8F9CBCC023861C\__processing\1731420106_-6636_898aac16b7824effaa048bcce3a2f6db_58448818.envelope
  Debug: CachingTransport received request to flush the cache.
  Debug: Sending cached envelope: 898aac16b7824effaa048bcce3a2f6db
  Debug: HttpTransport: Envelope '898aac16b7824effaa048bcce3a2f6db' successfully sent. Content: {"sdk":{"name":"sentry.dotnet","version":"4.13.0"},"event_id":"898aac16b7824effaa048bcce3a2f6db","trace":{"trace_id":"17c90feb289d417bb698951abc16fb1d","public_key":"2acc39f86f2b4f5a99bac09494af13c6","release":"CollapseLauncher@1.82.1\u002B325e4d73d25d70a87b4f42b59848240f01d4bd28","environment":"debug"},"sent_at":"2024-11-12T14:01:48.2080705+00:00"} {"type":"event","length":7162} 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{"type":"attachment","filename":"log-2024-11-12-pre1.82.1-id1.log","attachment_type":"event.attachment","content_type":"text/plain","length":0}  {"type":"session","length":360} {"sid":"125a7b4cb6754d3796c66d514855f8de","did":"a0d2095d-77f4-4121-91ee-1cb541a43ac3","init":false,"started":"2024-11-12T21:01:28.7803595+07:00","timestamp":"2024-11-12T14:01:46.7547321+00:00","seq":1,"duration":17,"errors":1,"status":"crashed","attrs":{"release":"[email protected]\u002B325e4d73d25d70a87b4f42b59848240f01d4bd28","environment":"debug"}}
  Debug: No cached file to process.
  Debug: Flushing cached envelopes.
  Debug: No cached file to process.

Link to the Sentry handler code

https://github.com/CollapseLauncher/Collapse/blob/325e4d73d25d70a87b4f42b59848240f01d4bd28/Hi3Helper.Core/Classes/SentryHelper/SentryHelper.cs

[jamescrosswell]

@bagusnl it doesn't look like there are any clues in either your code or the debug log.

Are you able to describe how we can reproduce this?

[bagusnl]

When I try to upload attach a log with the exception data, in the debug log you can see that the length is 0
{"type":"attachment","filename":"log-2024-11-12-pre1.82.1-id1.log","attachment_type":"event.attachment","content_type":"text/plain","length":0}

I have tried Sentry.io DSN and it works just fine as I can see the attachment in the dashboard, but the "length":0 causes a bit of a problem with other DSN provider such as attachment not seen or error 400 (BadRequest) when sending the envelope

[jamescrosswell]

Ah, I see... so the root cause of the problem is that the attachment length isn't being set properly.

I'm still not sure how to reproduce this though... If you could create a minimum reproducible example of the problem, I'd recommend opening an issue.