telegram: exclude link targets from message length - #5499
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Signed-off-by: Aleksei Chistiakov <aleks00799@gmail.com>
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe Telegram notifier now counts visible HTML text when enforcing the 4096-rune message limit. Markup and attribute values are excluded. Malformed HTML falls back to full-message rune counting. ChangesTelegram HTML length handling
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The PR corrects Telegram length counting to use visible HTML text while preserving the over-limit fallback for malformed content. No actionable merge-blocking risk remains after normal checks and review. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description explains the behavior change, testing, bugfix coverage, sign-off, and release-note entry. Some checklist items are not explicitly addressed, but the required information is mostly complete.
✨ Finishing Touches🧪 Generate unit tests (beta)
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| for { | ||
| switch tokenizer.Next() { | ||
| case html.ErrorToken: | ||
| return count |
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This seems like the wrong with to return here?
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x/net/html uses ErrorToken for normal EOF, so returning the accumulated count remains correct when Raw() is empty. An incomplete token can also return ErrorToken with unconsumed raw bytes, which made this path return a partial count. Commit fc7887d detects that case and conservatively returns the raw rune count instead.
| return err | ||
| } | ||
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| // htmlTextRuneCount excludes HTML markup and attribute values such as link targets. |
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Can you find the corresponding source code? I don't feel comfortable just trusting the documentation.
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Verified against source. The Bot API calls parseTextEntities in Client.cpp. TDLib HTML parsing stores href separately as entity data and removes markup from resulting text in MessageEntity.cpp. The 4096 limit is then checked against parsed text in MessageContent.cpp. Thus the embedded link target is excluded from that limit. There is also a separate 32768-byte raw-input guard before parsing; this regression case remains below it.
| expText: `Alertmanager notification could not be sent: message length exceeds Telegram limits. | ||
| Please check the template used for producing the message content.`, | ||
| }, | ||
| { |
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Let's add a test case for broken html too?
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Added in fc7887d. The regression renders a malformed anchor at the beginning through safeHtml, followed by more than 4096 raw runes. Before the fix, tokenization returned a partial count and the message was sent unchanged; it now takes the conservative fallback path.
Signed-off-by: Aleksei Chistiakov <aleks00799@gmail.com>
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Actionable comments posted: 1
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Inline comments:
In `@notify/telegram/telegram.go`:
- Around line 161-162: Update htmlTextRuneCount to detect incomplete HTML
comment and markup-declaration tokens before returning the partial count,
including cases where the tokenizer yields an empty Raw() ErrorToken after
skipping the incomplete token. Ensure malformed oversized messages trigger the
existing length fallback, and add a regression test covering an unterminated
comment or markup declaration.
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notify/telegram/telegram.gonotify/telegram/telegram_test.go
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Signed-off-by: Aleksei Chistiakov <aleks00799@gmail.com>
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Thanks, I think this approach is sound, even described by Telegram . I'm just worried about the maintenance overhead of this: The API contract here is extremely weak. And the previous implementation is much easier to maintain/understand. I will talk to the other maintainers to find out what they think. |
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Sure, no problem. Happy to help! |
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Summary
hrefURLs.Testing
go test ./notify/... -count=1golangci-lint run ./notify/telegram/...Pull Request Checklist
Which user-facing changes does this PR introduce?