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fix(terminal): bound live xterm backpressure

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d fei
2026-08-24 19:06:50 +08:00
parent 9cfd8e8989
commit 7c62b16e5f
8 changed files with 200 additions and 52 deletions
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src/web/public/terminal-ui.js
+19 -8
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@@ -3167,7 +3167,7 @@ Object.assign(CodemanApp.prototype, {
* arrived, which looked like truncated responses and idle shell commands.
*/
_scheduleTerminalWriteFlush() {
if (this.writeFrameScheduled || this.pendingWrites.length === 0) return;
if (this._terminalWriteInFlight || this.writeFrameScheduled || this.pendingWrites.length === 0) return;
this.writeFrameScheduled = true;
this._safeYield(() => {
this.writeFrameScheduled = false;
@@ -3358,7 +3358,7 @@ Object.assign(CodemanApp.prototype, {
* Strips markers and writes content atomically within a single frame.
*/
flushPendingWrites() {
if (this.pendingWrites.length === 0 || !this.terminal) return;
if (this._terminalWriteInFlight || this.pendingWrites.length === 0 || !this.terminal) return;
const _t0 = performance.now();
// xterm.js 6.0+ natively handles DEC 2026 synchronized output markers.
@@ -3389,14 +3389,25 @@ Object.assign(CodemanApp.prototype, {
const preserveViewportY =
this.terminal.buffer?.active && !this.isTerminalAtBottom() ? this.terminal.buffer.active.viewportY : null;
if (_joinedLen <= MAX_FRAME_BYTES) {
this.terminal.write(joined);
} else {
// Write first chunk now, defer rest to next frame
this.terminal.write(joined.slice(0, MAX_FRAME_BYTES));
const writeChunk = joined.slice(0, MAX_FRAME_BYTES);
if (_joinedLen > MAX_FRAME_BYTES) {
// Keep the remainder app-side where the 128KB cap can see it. The next
// chunk is scheduled only after xterm confirms this one was parsed.
this.pendingWrites.push(joined.slice(MAX_FRAME_BYTES));
deferred = true;
this._scheduleTerminalWriteFlush();
}
this._terminalWriteInFlight = true;
this._terminalWriteInFlightBytes = writeChunk.length;
try {
this.terminal.write(writeChunk, () => {
this._terminalWriteInFlight = false;
this._terminalWriteInFlightBytes = 0;
this._scheduleTerminalWriteFlush();
});
} catch (err) {
this._terminalWriteInFlight = false;
this._terminalWriteInFlightBytes = 0;
throw err;
}
if (
preserveViewportY !== null &&