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fix(ws): give up a stuck connect attempt and reconnect at once on wake - #954
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A WebSocket that stays in CONNECTING (a phone waking on a dead network, a tunnel that drops the handshake) had no deadline, so no new attempt ever started. wake() also returned when no reconnect timer was set, which is exactly the state of a page that froze before its socket's close event ran. Close and retry an attempt still CONNECTING after 8 s, ending it on the client side without waiting for a close event. wake() now ends a dead socket whose close event is pending and connects at once; an open or connecting socket is left alone. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The title is concise, specific, and accurately summarizes the two main WebSocket changes: abandoning stuck connection attempts and reconnecting on wake. |
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Review comments at @src/lib/ws.ts:
- Line 252: Update wake() so replacing a CLOSING socket does not overwrite a
pending 4008 close with 1006; preserve the 4008 outcome so its late close event
still stops automatic reconnect and shows the notice, while continuing to ignore
duplicate cleanup for ordinary late closes. Add a test that wakes a CLOSING
socket before its 4008 close event arrives.
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changelog.d/ws-connect-deadline.mdsrc/AGENTS.mdsrc/lib/ws.test.tssrc/lib/ws.ts
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…hakes connect - wake() leaves a CLOSING socket to its close event, so an output-stalled (4008) close still stops output and a submit-result that arrives during the closing handshake is still delivered. - A CLOSED socket wake() ends early is remembered: if its late close event says 4008, the replacement connection is closed and output stops. - The connect deadline doubles with each attempt given up (8 s, 16 s, capped at 30 s) and starts over once an attempt opens, so a remote PC whose upgrade waits up to 15 s for the machine relay still connects. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…nd a 4008 - wake() (visible, pageshow, online) now gives up an attempt still CONNECTING after an earlier deadline fired (its deadline has grown to 16-30 s) and connects at once; the fresh attempt starts at 8 s again. A first attempt still connecting is left alone as before. - A pending backoff retry is cancelled when connect() creates a new socket and when output stops, and the retry callback checks for a stopped output, so a replacement closed with 4008 inside the backoff window no longer reconnects and replays attaches behind "Terminal output stopped". Regression tests for both in src/lib/ws.test.ts (each fails on the previous head). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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… ping (#967) ## Problem A WebSocket can still report `OPEN` after its TCP path is gone, for example when a phone moves from Wi-Fi to cellular or wakes on a changed network. No close event arrives for tens of seconds to minutes. In that time: - the terminal stops updating while the header still says connected, and no reconnecting banner shows; - keys go to `rawSend` on the dead socket and `sendInput()` returns true, so PaneTerminal never keeps them as a held draft and they are lost; - a composer send waits the full 90 s submit timeout; - `wake()` (visibilitychange / pageshow / online) leaves an `OPEN` socket alone. ## Cause `HerdrSocket` treats `readyState === OPEN` as proof that the connection is alive. The protocol has no app-level ping. Bun's own pings and idle timeout only tell the server about a dead peer, and the browser never sees them. ## Fix - **Protocol** (`shared/protocol.ts`): new `ClientMessage` `ping {id}`, `ServerMessage` `pong {id}` and `ServerFeature` `"ping"`. The doc comments on both frames are new. - **Server** (`server/index.ts`): answers `ping` with `pong` for any role and lists `"ping"` in its snapshot. A malformed id gets an `invalid_ping` error frame, not a pong. - **Remote relay:** no code change. `MachineRelay` already forwards frames as they are, so the remote PC's own snapshot decides whether the client pings. The contract test proves the pass-through. - **Demo** (`site/demo/transport.ts`): lists `"ping"` and answers it the way the server does. - **Client** (`src/lib/ws.ts`): - Tracks `lastFrameAt`. On a bridge whose last snapshot listed `"ping"`, it probes an `OPEN` socket on wake (visible, pageshow, online) and after 20 s without a frame while the page is visible (checked every 5 s). The flag is remembered across reconnects, so a socket whose snapshot never arrives (a relay path that dies right after the upgrade, a failed snapshot) is probed too. - Only the `pong` of a ping in flight ends a probe. Any frame still postpones the idle probe, but a frame the browser buffered before a sleep, or a pong with another id, does not prove the path is alive. The probe ends before handlers run, so `canInput()` already reads true for them. - No pong within 3 s sends a second ping; no pong to that drops the socket on the client side: `socket = null`, the disconnect handlers run, submits settle as `disconnected`, `close()` is called, and `connect()` runs at once with retries reset. The open handler then replays the role and attaches. Each probe that ends in a drop doubles the per-ping deadline (cap 12 s) until a pong comes back, so a slow relayed link is not dropped over and over. - A dropped socket is kept in `endedEarly` (now a `WeakSet`, shared with `wake()`), so a 4008 close that arrives after the drop still stops output and closes the replacement. A socket that is `CLOSING` when the deadline hits is left to its close event (same rule as #954's `wake()`). - Hiding the page cancels a probe; showing it starts a fresh one. A deadline that fires more than 2 s late (the page was frozen and the timer ran before the queued pong) pings again instead of dropping. - While a probe waits, `canInput()` refuses, so typing goes to the held draft. `submit()`, `pendingAction()` and `sendSecret()` wait the probe out after their snapshot wait and right before sending; if the socket is dropped they settle as `disconnected` having sent nothing (the secret is still cleared). The composer no longer reports offline during a routine probe. - New explicit `ConnectionState` (`idle | connecting | open | probing | waiting | stopped | closed`), exposed as `state`. `connected` still reads the socket itself, so the banner does not flash on every tab switch. - **Held draft** (`src/components/PaneTerminal.tsx`): once input is held for a pane, all later typing joins the draft until Send or Discard, also after the terminal is ready again. Before this, keys refused during a probe (or a disconnect) were held while the next keys after the pong went straight to the pty: `echo ` held and `rm -rf build⏎` run. Text, pastes, Backspace and anything with a line break join the draft; Enter is left out of it, a sticky-modifier chord is refused with a note (new string, translated in ko/ja/zh/tr), and the input line's Enter is refused while a draft is held. Other control keys (Ctrl+C, Escape from the Stop button, Tab, arrows) still reach the program, so an interrupt never waits on the draft. - `src/AGENTS.md`: the WS client row records the probe rules, and a new row records the held-draft rule. ## Tests - `src/lib/ws.test.ts` (fake socket and fake timers): - an `OPEN` socket with no pong gets a second ping at 3 s and is dropped at 6 s. The disconnect handler runs once, a pending submit settles as `disconnected`, a new socket starts with no backoff and its open replays role and attach at the saved geometry, and the late close of the old socket changes nothing; - during a probe, `sendInput` and `sendKeys` are refused; a buffered `pane-status` frame and a pong with another id leave it probing; the matching pong restores input; a second wake sends no second ping; - a socket that only delivers stale frames during a probe is dropped; - `submit`, `pendingAction(steer)` and `sendSecret` started during a probe send nothing until the pong, then each sends once; - a submit already waiting on its snapshot when `wake()` runs, and a secret, settle as `disconnected` with nothing sent when the probe drops the socket; - a 4008 close after a probe drop still stops output and closes the replacement; - a deadline that runs out while the page is frozen pings again, and the pre-freeze pong no longer counts; - hiding the page cancels the probe (no drop in 60 s), showing it starts a fresh one; - a reconnected socket with no snapshot is probed when the previous snapshot listed `ping`; - a probe drop doubles the next deadline, and a pong resets it; - plus the earlier idle-ping, no-flag and `CLOSING` tests. - The 10 new or changed tests fail with the previous `ws.ts` of this branch (checked by restoring it). - `scripts/terminal-input-regression.ts`: after the terminal becomes ready with `a` held, Enter and `b` are typed: the draft reads `ab` and nothing reaches the pane; Escape still reaches the pane with the draft kept; Send types `ab` once with no Enter. It fails without the PaneTerminal change (checked by restoring it and rebuilding). - `server/ping.contract.test.ts` (integration, real herdr): the snapshot lists `ping`; ping gets a pong with the same id, also for an observe role; a malformed id gets `invalid_ping`; ping and pong pass through `MachineRelay`. Not rerun for the review fixes (no server change). - `bun run typecheck`: pass. - `HERDR_TEST_MODE=unit bun test ./src/lib/ws.test.ts`: 49 pass. - `bun run test:unit`: 3088 pass, 0 fail, 8 skip (includes the #949 convention guards). - `bun run check run --build bun scripts/terminal-input-regression.ts`: pass. - `scripts/ui-contexts-regression.ts` passed on the first revision; not rerun after the review fixes. - No browser test of a real half-open socket: Playwright cannot hold a socket half-open, so the unit tests cover that part. ## Notes - **Stacked on #954; retarget to main after it merges.** It builds on #954's connect deadline, `wake()` rules and `SOCKET_CLOSING` handling in `ws.ts`. - **Release:** `shared/protocol.ts` and `server/index.ts` are inputs to the remote bundle, so the release must raise `REMOTE_BUNDLE_VERSION`. The release guard from #948 (`scripts/release-guards.ts`) refuses to tag otherwise. It is not bumped here. Until a remote PC updates, its snapshot does not list `ping`, so it is never probed and behaves as before. - **Trade-off:** a key typed within one round trip of a probe start lands in the held draft with Send/Discard rather than being sent, and later typing joins it until the user picks one. Sending it later on its own would break the never-queue rule. - **Left out on purpose:** - In-flight submits still settle as `disconnected` on a probe drop rather than waiting for the close event: a half-open socket may not close for minutes, and the server never types a message more than 45 s after it arrived. - No "checking connection" UI and no state-change event for probe start and end. `inputReady` drives the "Waiting for terminal input…" banner and the key bar, so a sub-second probe on a healthy link would flash both on every wake. The held-draft banner already shows the case the user can act on, and the composer no longer reports offline. The remaining gap: PaneTerminal recomputes `inputReady` only when a message arrives. - The `ping` flag survives a reconnect: if a PC is downgraded to a bridge without `ping`, the first probe after the reconnect costs one drop before the new snapshot clears the flag. - `resume()` in PaneTerminal still resets the screen before the attach answers (render-scroll-1's second half). - **Overlaps:** - #956 edits the held-draft code (`applyToDraft` Backspace and line breaks) and the same lines of `scripts/terminal-input-regression.ts`: a textual conflict, and the test expectation changes with it: after #956 an Enter in the draft becomes a space plus a notice, so the held and sent text become `a b` instead of `ab`. Never an Enter either way. - #932 edits the same `submit()` guard area in `ws.ts`, plus `protocol.ts` and the demo transport. - #951, #936 and #859 add to the protocol unions, the demo switch and `server/index.ts`'s message switch. These are textual merges with no conflict in meaning. - #962, #964 and #966 touch PaneTerminal's key bar and input line, not the onData draft path. - #952 owns `server/machine-relay.ts`. Nothing changed there. - From a mobile-terminal stability audit: connection-1, render-scroll-1, lifecycle-1, history-1, moshi-1. ## Merge-session review Fixed (each with a regression test that fails without the fix): - **Hiding the page answered the probe** (`ws.ts`): a submit, pending action or secret waiting on a probe was sent on an unchecked socket once the page hid. A hidden page now pauses the probe (`probePaused`): input stays refused, waiters keep waiting, and showing the page pings again. Test: `keeps a submit and a secret waiting when the page hides during a probe...`; the existing hide test now expects `probing` and refused input while hidden. - **Replacing a CLOSING socket left its probe unresolved** (`ws.ts`): `connect()` now ends a non-null previous socket (CLOSING, or CLOSED before its close event) first, so its probe and waiting submits settle, the disconnect handlers run, and a late 4008 from it still stops output (`endedEarly`). Test: `settles a submit waiting on a probe when a CLOSING socket is replaced...`. - **Ctrl+Enter under modifyOtherKeys got past the held-draft guard** (`PaneTerminal.tsx`): a modified Enter is decided on before its rewrite to `CSI 27;5;13~` and refused like a chord, with the held-input note. Test: `terminal-input-regression` turns on modifyOtherKeys and presses Ctrl+Enter beside a held draft. - **A paste with a tab went to the pty and a multi-line paste was dropped in silence** (`PaneTerminal.tsx`): while a draft is held, a paste the draft cannot take is refused with the held-input note. Test: paste `a\tb` and `x\ny` beside a held draft; nothing reaches the pane, and the multi-line paste is told or held, never dropped in silence (written so it still holds once #956 folds line breaks into the draft). - **The input line said "disconnected" and its non-empty line got past the draft rule** (`TerminalInput.tsx`, `PaneTerminal.tsx`): `onEnter` returns `boolean | string` and the held-input reason is shown; `sendTerminalLine` refuses beside a held draft too and keeps the text. Test: empty Enter and `ls` + Enter on the input line beside a held draft show the held-input note and send nothing. - `src/AGENTS.md` rows and the changelog fragment updated to match. Deferred (unchanged from the builder's notes, including its review finding 8): the items under "Left out on purpose" above, such as PaneTerminal recomputing `inputReady` only when a message arrives. Notes for the merge step: - #968 is stacked on this branch and does not carry these two commits; it picks them up when restacked onto main after this PR squash-merges. - #956 overlap: the `terminal-input-regression` Send step now checks the draft's own text, so it holds whether #956 shows `ab` or `a b`. Checks: `bun run check fast` pass; `scripts/ui-regression.ts` (terminal input, Ctrl+Enter, held-draft lanes) pass; `scripts/sticky-modifiers-regression.ts` pass. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Problem
On a phone, the app could stay disconnected until a reload after waking:
CONNECTING(waking on a dead network, a tunnel that drops the handshake) never timed out, so no new attempt started.wake()(visibilitychange / pageshow / online) did nothing unless a reconnect timer was pending. A page frozen in the background can come back with a socket alreadyCLOSEDwhose close event has not run yet, so no timer is set and the wake was ignored.Cause
HerdrSocket.connect()insrc/lib/ws.tshad no deadline for the handshake, andwake()returned early onreconnectTimer === null.Fix
CONNECT_TIMEOUT_MS = 8_000: an attempt stillCONNECTINGat the deadline is closed and ended on the client side through the same path as a close event (closed()), which settles submits, fires disconnect handlers and schedules the normal backoff retry. The abandoned socket's late close event is ignored by the existing stale-socket guard.wake()no longer requires a pending timer. A socket that isCLOSING/CLOSEDwith its close event still pending is ended first (so its submits and listeners settle), thenconnect()runs at once. An open or connecting socket is left alone; a stopped output (4008) and a disposed client still do not reconnect.close().Tests
src/lib/ws.test.ts(fake WebSocket + fake timers):CONNECTINGis closed at 8 s, a new attempt starts after the backoff, the late close event changes nothing, and an open socket gets no deadline;CLOSEDsocket and no timer connects at once; wake while connecting or open does nothing.ws.ts).bun run typecheck: pass.HERDR_TEST_MODE=unit bun test ./src/lib/ws.test.ts: 32 pass.bun run test:unit: 3075 pass, 0 fail, 8 skip (after the review fixes).HerdrSocketand covered by the unit tests.Notes
src/lib/ws.tsandws.test.ts, but only the submit path (SubmitDelivery,canSteerMessages,steering_id); it does not touch connect/wake/close. Textual merge conflicts are unlikely; whichever lands second may need a trivial rebase of the test file's tail.OPENbut is dead (heartbeat), and anything server-side.src/AGENTS.md's WS client row records the deadline and wake rule.Review follow-up (670a259)
server/machine-relay.ts), so a fixed 8 s cut every such handshake. Test: a 12 s handshake connects on the second attempt.wake()leaves aCLOSINGsocket to its close event: a server close withOUTPUT_STALLED_CLOSE_CODE(4008) still stops output, and asubmit-resultarriving during the closing handshake is still delivered. Tests for both orderings.CLOSEDsocket thatwake()ends early (defensive; per spec readyState turns CLOSED in the task that fires close) is remembered: a late 4008 close from it closes the replacement and stops output. Test included.Merge-session review (f928acf)
Fixed:
wake()(visible, pageshow, online) now gives up an attempt stillCONNECTINGafter an earlier deadline already fired (its deadline has grown to 16-30 s) and connects at once;wake()also resets the deadline so the fresh attempt starts at 8 s. A first attempt still connecting is left alone. Before, a 30 s attempt started on a network that then came back kept the page disconnected for the rest of its deadline. Test: an escalated attempt is replaced on wake and the new one times out at 8 s.connect()creates a new socket and when output stops (stopOutput()), and the retry callback returns on a stopped output or disposed client. Before (also on main after a plain 1006), a pane mount connecting inside the backoff window, then a 4008 on that replacement, let the old timer reconnect and replay attaches behind "Terminal output stopped". Test: a retry pending at 4 s does not open a socket after the replacement closes with 4008.src/AGENTS.mdWS client row updated to match.Checks:
bun run check fastpassed (typecheck, build, 3077 unit tests);scripts/ui-contexts-regression.ts(includes the composer reconnect check) passed.Deferred: none.
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