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delivery-log-storage: the tailer keeps the lines of queued messages

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Every mail.log line headed by a queue id is written to send_log_lines as the
tailer reads it, dated by the line's own stamp. The id is taken from the head
of the line only - the tail is the far end's text - and has to look like one:
"NOQUEUE:" and "warning:" stand in the same place.

The tailer does not check for a send-log row first: a message's first lines
come before the journal milter writes it. Lines that never get a row are
removed by the prune, which deletes lines older than an hour whose queue id
no row carries. It runs at start, after each send-log sweep and hourly.

While the tailer catches up at start a line is written only if it is not
there already, as the inbound journal does: its place is saved every few
seconds, so an unclean stop means reading some lines twice.

Checked on Windows: go vet clean; go test ./internal/logtail passes except
TestFollowTailsAndRotates, which fails there on renaming an open file and
always did. New tests: which line heads are queue ids, a line dated by its
stamp, no second copy after a rewound offset, the prune cadence and cutoff.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
mix
2026-10-12 10:11:28 +03:00
co-authored by Claude Opus 5.5
parent 3d17206063
commit 81df131217
8 changed files with 319 additions and 17 deletions
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docs/roadmap.md
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@@ -36,7 +36,7 @@ in `git log` and [CHANGELOG.md](../CHANGELOG.md).
| structured-logging | `log/slog` with levels and fields | candidate | — | — |
| review-2026-08-followups | Remaining findings of the 2026-08-19 code review | candidate | — | — |
| panel-notifications | E-mail notifications about important events | candidate | — | — |
| delivery-log-storage | Keep a message's `mail.log` lines with its send-log row | in progress | 1/8 | [plans/delivery-log-storage.md](plans/delivery-log-storage.md) |
| delivery-log-storage | Keep a message's `mail.log` lines with its send-log row | in progress | 2/8 | [plans/delivery-log-storage.md](plans/delivery-log-storage.md) |
| password-reset | Password reset by e-mail | candidate | — | — |
| phone-desktop-mode | A phone browser in "desktop site" mode gets the phone navigation | candidate | — | — |
| panel-redesign | Panel redesign (accepted mockups, design contract) | shipped `2.0.0` | 27/27 | [plans/panel-redesign.md](plans/panel-redesign.md) |