Files
LambdaMail/services/protocols/go.sum
T
Lucas RayanandClaude Opus 5 93d21b4752 #21: push new mail to the browser over WebSocket
F4 lists real-time updates and the interface had none: an open inbox only
changed when the user reloaded it.

Events come from the transactional outbox rather than from an in-process
callback, which is what the outbox is for (PLAN.md section 9.4): the row
is written in the same transaction as the message, so an event can never
describe a delivery that rolled back, and a crash between commit and
publish loses nothing because the row is still there on restart. The relay
claims rows with SKIP LOCKED so a second instance can help without
publishing anything twice.

The hub fans events out per mailbox, keyed by the mailbox the session
resolved to, so one account's arrivals are never visible to another even
though they share the process. A subscriber that stops reading is dropped
rather than allowed to stall the relay; it reconciles on reconnect.

The client reconnects with capped exponential backoff and treats every
successful connect as a resync, refetching the folder. Without that, a
socket that dropped for a minute would leave the list quietly stale, which
is worse than having no real-time updates at all.

The upgrade goes through a Next rewrite, not the API route handler: a
route handler sees a finished request and cannot upgrade a connection.
Verified against the running stack - the handshake returns 101 through the
Next server, and a message delivered on port 25 arrives as a frame on an
already-open socket without the page asking for it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-02 10:26:54 -03:00

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9.9 KiB
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