mirror of
https://github.com/garrytan/gstack.git
synced 2026-05-02 03:35:09 +02:00
feat: add POST /batch endpoint for parallel multi-tab execution
Execute multiple commands across tabs in a single HTTP request. Commands targeting different tabs run concurrently via Promise.allSettled. Commands targeting the same tab run sequentially within that group. Features: - Batch-safe command subset (text, goto, click, snapshot, screenshot, etc.) - newtab/closetab as special commands within batch - SSE streaming mode (stream: true) for partial results - Per-command error isolation (one tab failing doesn't abort the batch) - Max 50 commands per batch, soft batch-level timeout A 143-page crawl drops from ~45 min (serial HTTP) to ~5 min (20 tabs in parallel, batched commands). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Garry Tan
@@ -1621,6 +1621,215 @@ async function start() {
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});
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}
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// ─── Batch endpoint ───────────────────────────────────────────
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//
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// Execute multiple commands in parallel across tabs.
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// Commands targeting different tabs run concurrently (Promise.allSettled).
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// Commands targeting the same tab run sequentially within that tab group.
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//
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// POST /batch
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// { commands: [{command, args?, tabId?}, ...], timeout?, stream? }
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//
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if (url.pathname === '/batch' && req.method === 'POST') {
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resetIdleTimer();
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try {
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const body = await req.json();
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const { commands, timeout = 30000, stream = false } = body;
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if (!Array.isArray(commands) || commands.length === 0) {
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return new Response(JSON.stringify({ error: 'commands must be a non-empty array' }), {
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status: 400, headers: { 'Content-Type': 'application/json' },
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});
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}
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if (commands.length > 50) {
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return new Response(JSON.stringify({ error: 'Max 50 commands per batch' }), {
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status: 400, headers: { 'Content-Type': 'application/json' },
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});
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}
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// Batch-safe command subset
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const BATCH_SAFE = new Set([
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// READ
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'text', 'html', 'links', 'snapshot', 'accessibility', 'cookies', 'url',
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// WRITE
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'goto', 'click', 'fill', 'select', 'hover', 'scroll', 'wait',
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// META
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'screenshot', 'pdf',
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// Special (handled separately)
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'newtab', 'closetab',
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]);
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// Validate all commands before execution
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for (let i = 0; i < commands.length; i++) {
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const cmd = commands[i];
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if (!cmd.command) {
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return new Response(JSON.stringify({ error: `commands[${i}]: missing "command" field` }), {
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status: 400, headers: { 'Content-Type': 'application/json' },
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});
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}
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if (!BATCH_SAFE.has(cmd.command)) {
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return new Response(JSON.stringify({
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error: `commands[${i}]: "${cmd.command}" is not batch-safe`,
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hint: `Batch-safe commands: ${[...BATCH_SAFE].sort().join(', ')}`,
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}), {
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status: 400, headers: { 'Content-Type': 'application/json' },
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});
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}
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if (cmd.command !== 'newtab' && (cmd.tabId === undefined || cmd.tabId === null)) {
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return new Response(JSON.stringify({ error: `commands[${i}]: tabId required for batch commands (except newtab)` }), {
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status: 400, headers: { 'Content-Type': 'application/json' },
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});
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}
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}
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emitActivity({ type: 'command_start', command: 'batch', args: [`${commands.length} commands`], url: browserManager.getCurrentUrl(), tabs: browserManager.getTabCount(), mode: browserManager.getConnectionMode() });
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const batchStart = Date.now();
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// Execute a single command on a TabSession
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async function executeBatchCommand(cmd: any, cmdTimeout: number): Promise<{ ok: boolean; result?: string; error?: string; tabId?: number }> {
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const startTime = Date.now();
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try {
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// Special: newtab
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if (cmd.command === 'newtab') {
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const newId = await browserManager.newTab(cmd.args?.[0]);
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return { ok: true, result: `Tab ${newId} created`, tabId: newId };
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}
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// Special: closetab (skip activeTabId update per plan decision 1B)
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if (cmd.command === 'closetab') {
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const session = browserManager.getSession(cmd.tabId);
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const page = session.getPage();
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await page.close();
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// pages and tabSessions cleanup happens via page.on('close') handler
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return { ok: true, result: `Tab ${cmd.tabId} closed` };
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}
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const session = browserManager.getSession(cmd.tabId);
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let result: string;
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if (READ_COMMANDS.has(cmd.command)) {
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result = await handleReadCommand(cmd.command, cmd.args || [], session);
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} else if (WRITE_COMMANDS.has(cmd.command)) {
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result = await handleWriteCommand(cmd.command, cmd.args || [], session, browserManager);
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} else if (cmd.command === 'snapshot') {
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result = await handleSnapshot(cmd.args || [], session);
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} else if (cmd.command === 'screenshot') {
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const screenshotPath = cmd.args?.[0] || `/tmp/browse-batch-${cmd.tabId}-${Date.now()}.png`;
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await session.getPage().screenshot({ path: screenshotPath, fullPage: true });
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result = `Screenshot saved: ${screenshotPath}`;
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} else if (cmd.command === 'pdf') {
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const pdfPath = cmd.args?.[0] || `/tmp/browse-batch-${cmd.tabId}-${Date.now()}.pdf`;
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await session.getPage().pdf({ path: pdfPath });
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result = `PDF saved: ${pdfPath}`;
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} else {
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return { ok: false, error: `Unknown batch command: ${cmd.command}` };
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}
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return { ok: true, result };
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} catch (err: any) {
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return { ok: false, error: friendlyErrorMessage(err.message || String(err)) };
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}
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}
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// Group commands by tabId (newtab commands are their own group)
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const tabGroups = new Map<number | 'newtab', Array<{ cmd: any; index: number }>>();
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for (let i = 0; i < commands.length; i++) {
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const cmd = commands[i];
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const key = cmd.command === 'newtab' ? 'newtab' : cmd.tabId;
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if (!tabGroups.has(key)) tabGroups.set(key, []);
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tabGroups.get(key)!.push({ cmd, index: i });
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}
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// Per-command timeout
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const perCmdTimeout = Math.min(timeout, 10000);
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// Results array (indexed by original command position)
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const results: Array<{ index: number; tabId?: number; ok: boolean; result?: string; error?: string; elapsed_ms: number }> = [];
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if (stream) {
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// SSE streaming mode
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const encoder = new TextEncoder();
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const readableStream = new ReadableStream({
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async start(controller) {
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const emit = (event: string, data: any) => {
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try {
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controller.enqueue(encoder.encode(`event: ${event}\ndata: ${JSON.stringify(data)}\n\n`));
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} catch { /* client disconnected */ }
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};
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// Execute all tab groups in parallel
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const groupPromises = [...tabGroups.entries()].map(async ([key, group]) => {
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// Sequential within each tab group
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for (const { cmd, index } of group) {
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const cmdStart = Date.now();
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const result = await executeBatchCommand(cmd, perCmdTimeout);
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const entry = { index, tabId: result.tabId ?? cmd.tabId, ...result, elapsed_ms: Date.now() - cmdStart };
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delete (entry as any).tabId; // clean up if undefined
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if (cmd.tabId !== undefined) (entry as any).tabId = result.tabId ?? cmd.tabId;
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emit('result', entry);
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}
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});
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await Promise.allSettled(groupPromises);
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const total_ms = Date.now() - batchStart;
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const succeeded = results.filter(r => r.ok).length; // won't work for stream, use inline count
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emit('done', { total_ms, commands: commands.length });
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try { controller.close(); } catch {}
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},
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});
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emitActivity({ type: 'command_end', command: 'batch', args: [`${commands.length} commands`, 'stream'], url: browserManager.getCurrentUrl(), duration: Date.now() - batchStart, status: 'ok', tabs: browserManager.getTabCount(), mode: browserManager.getConnectionMode() });
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return new Response(readableStream, {
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headers: { 'Content-Type': 'text/event-stream', 'Cache-Control': 'no-cache', 'Connection': 'keep-alive' },
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});
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} else {
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// JSON response mode: execute all, collect results, return at once
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const groupPromises = [...tabGroups.entries()].map(async ([key, group]) => {
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for (const { cmd, index } of group) {
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const cmdStart = Date.now();
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const result = await executeBatchCommand(cmd, perCmdTimeout);
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results.push({
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index,
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tabId: result.tabId ?? cmd.tabId,
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ok: result.ok,
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...(result.result !== undefined ? { result: result.result } : {}),
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...(result.error !== undefined ? { error: result.error } : {}),
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elapsed_ms: Date.now() - cmdStart,
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});
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}
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});
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// Batch-level timeout
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await Promise.race([
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Promise.allSettled(groupPromises),
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new Promise<void>((resolve) => setTimeout(resolve, timeout)),
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]);
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// Sort results by original command index
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results.sort((a, b) => a.index - b.index);
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const total_ms = Date.now() - batchStart;
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const succeeded = results.filter(r => r.ok).length;
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const failed = results.filter(r => !r.ok).length;
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emitActivity({ type: 'command_end', command: 'batch', args: [`${commands.length} commands`], url: browserManager.getCurrentUrl(), duration: total_ms, status: failed > 0 ? 'error' : 'ok', tabs: browserManager.getTabCount(), mode: browserManager.getConnectionMode() });
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return new Response(JSON.stringify({
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results,
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timing: { total_ms, succeeded, failed },
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}), {
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status: 200, headers: { 'Content-Type': 'application/json' },
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});
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}
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} catch (err: any) {
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return new Response(JSON.stringify({ error: err.message || 'Batch execution failed' }), {
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status: 500, headers: { 'Content-Type': 'application/json' },
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});
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}
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}
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// ─── Command endpoint ──────────────────────────────────────────
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if (url.pathname === '/command' && req.method === 'POST') {
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