feat: Handle failures getting auth token from Spotify by charlesharries · Pull Request #73 · teal-fm/piper

charlesharries · 2026-08-26T11:57:04Z

This morning I noticed that Spotify briefly returned a 502 error when trying to refresh my access token:

2026/08/26 08:24:08 spotify: Error refreshing token for user 1: spotify token refresh failed (502):
<html><head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>502 Server Error</title>
</head>
<body text=#000000 bgcolor=#ffffff>
<h1>Error: Server Error</h1>
<h2>The server encountered a temporary error and could not complete your request.<p>Please try again in 30 seconds.</h2>
<h2></h2>
</body></html>
2026/08/26 08:24:08 spotify: No users to fetch tracks for.
2026/08/26 08:24:28 spotify: Error refreshing token for user 1: no refresh token available for user 1
2026/08/26 08:24:28 spotify: No users to fetch tracks for.
2026/08/26 08:24:58 spotify: Error refreshing token for user 1: no refresh token available for user 1
2026/08/26 08:24:58 spotify: No users to fetch tracks for.

Piper interpreted this as the refresh token being invalid and revoked it — resulting in no more tracks being scrobbled from Piper until I logged back in and set the refresh token anew.

Spotify returns a 400 response with {"error": "invalid_grant"} when the access token has legitimately expired (i.e. after 6 months, now, woof); this 502 was transient and should have kept the refresh token around to continue scrobbling.

This fix makes sure that only Spotify's real bad token scenario deletes the refresh token from the DB.

Summary by CodeRabbit

Bug Fixes
- Improved Spotify authentication recovery after token-refresh failures.
- Stale access tokens are now cleared after unsuccessful refresh attempts.
- Persisted refresh tokens are retained for temporary failures and removed only when Spotify permanently rejects them.
- Users with invalid or permanently rejected Spotify credentials are fully disconnected, preventing repeated failed refresh attempts.

coderabbitai · 2026-08-26T11:57:13Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Organization UI

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Run ID: 5c3e9224-6e4c-4dcf-af72-a5fd9c9146c3

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Reviewing files that changed from the base of the PR and between b17b781 and f217b73.

📒 Files selected for processing (2)

db/db.go
service/spotify/spotify.go

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📝 Walkthrough

Walkthrough

Spotify refresh handling now preserves refresh tokens after retryable failures, clears stale access-token cache entries, and deletes persisted refresh tokens only for HTTP 400 invalid_grant responses. Tests cover response classification and token state changes.

Changes

Spotify refresh handling

Layer / File(s)	Summary
Clear and select Spotify tokens `db/db.go`	The database clears stored Spotify token fields and excludes empty refresh tokens from expired-token selection.
Classify rejected refresh tokens `service/spotify/spotify.go`	The refresh flow treats only HTTP 400 responses with JSON error `invalid_grant` as permanent rejection. Permanent rejection clears persisted credentials.
Validate refresh failure persistence `service/spotify/spotify_test.go`	Tests configure credentials and a stub HTTP transport. They verify transient failures, invalid-grant cleanup, stale access-token removal, and rejection classification across response cases.

Estimated code review effort: 2 (Simple) | ~15 minutes

Merge Risk: ⚪ Minimal · up to f217b

The change narrows refresh-token deletion to Spotify's confirmed invalid-token response, preventing transient token-service failures from unnecessarily disconnecting users. No actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: karitham

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: handling Spotify authentication-token failures. It is concise and related to the token refresh failure behavior.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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greptile-apps · 2026-08-26T11:59:43Z

Greptile Summary

The PR prevents transient Spotify token-refresh failures from deleting stored refresh tokens.

Deletes persisted tokens only for HTTP 400 responses containing invalid_grant.
Adds coverage for transient failures, rejected tokens, and response classification.
Restores prior Viper credential values after each refresh-token test.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
service/spotify/spotify.go	Narrows refresh-token deletion to Spotify’s explicit invalid-grant response while retaining retryable tokens after transient failures.
service/spotify/spotify_test.go	Adds token-refresh regression tests and now restores prior global Viper credential values during cleanup.

_{Reviews (2): Last reviewed commit: "feat: Restore previous config during tes..." | Re-trigger Greptile}

coderabbitai

Actionable comments posted: 1

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Inline comments:
In `@service/spotify/spotify.go`:
- Line 291: Update UpdateUserToken and the GetUsersWithExpiredTokens selection
path so cleared refresh tokens are represented as NULL or excluded when empty,
preventing users with no refresh token from being returned to refresh jobs.
Preserve normal token persistence and refresh behavior for non-empty tokens.

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Create a new PR with the fixes

ℹ️ Review info

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 59554ca6-8549-4aaf-9357-7b66e06419b5

📥 Commits

Reviewing files that changed from the base of the PR and between ba25c77 and b17b781.

📒 Files selected for processing (2)

service/spotify/spotify.go
service/spotify/spotify_test.go

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mmattbtw

lgtm, thanks!

charlesharries added 2 commits August 26, 2026 12:43

feat: Only clear refresh token if Spotify tells us to

9385497

feat: Spotify only reports bad tokens with HTTP 400

ecd3a9b

greptile-apps Bot reviewed Aug 26, 2026

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Comment thread service/spotify/spotify_test.go Outdated

feat: Restore previous config during test teardown

b17b781

charlesharries marked this pull request as ready for review August 26, 2026 17:34

coderabbitai Bot reviewed Aug 26, 2026

View reviewed changes

Comment thread service/spotify/spotify.go Outdated

fix: Ensure tokens are nulled on expiry

f217b73

mmattbtw approved these changes Aug 27, 2026

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mmattbtw merged commit b9e497e into teal-fm:main Aug 27, 2026
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feat: Handle failures getting auth token from Spotify - #73

feat: Handle failures getting auth token from Spotify#73
mmattbtw merged 4 commits into
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charlesharries:auth-failure-token

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Confidence Score: 5/5

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charlesharries commented Aug 26, 2026 •

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