feat(playground): chat web sobre claude_pipe --stream (SSE)
Backend Go (web/server.go) que sirve un chat single-page y, por cada mensaje, lanza claude_pipe --stream como subprocess y reenvia sus eventos NDJSON (text_delta + result) al navegador via Server-Sent Events. Frontend vanilla (web/index.html), sin frameworks ni node_modules. Prueba el stack completo end to end a traves de una surface real: captura PTY -> vt_render -> parse_claude_tui (con fix del spinner) -> delta de streaming -> chat en vivo. Cada mensaje es una sesion claude one-shot (sin memoria entre turnos). Playground del padre, no indexado.
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@@ -44,3 +44,24 @@ go run artifact_probe.go --root /home/enmanuel/fn_registry --prompt "tu prompt a
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`--root` debe ser un repo cuyos MCP de claude ya estén aprobados, para que la TUI
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no muestre el diálogo de arranque.
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## Chat en el navegador (`web/`)
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Un chat web que prueba todo el stack end to end: backend Go con SSE que lanza
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`claude_pipe --stream` por cada mensaje y reenvía los `text_delta` al navegador,
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frontend chat vanilla (sin frameworks, sin node_modules).
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```bash
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cd apps/claude_pipe
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CGO_ENABLED=1 go build -tags fts5 -o claude_pipe . # binario con el fix del spinner
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cd playground
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go run ./web # http://localhost:8099
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# o con flags:
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go run ./web --port 8099 --root /home/enmanuel/fn_registry --warmup 4s --idle 4s --max 120s
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```
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Abre `http://localhost:8099` y escribe. Cada mensaje es una sesión `claude` nueva
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(sin memoria entre turnos: `claude_pipe` es one-shot). Hay ~8s de `warmup`+`idle`
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antes de la primera respuesta. La respuesta se reconstruye desde la TUI parseada,
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ya sin el spinner de carga.
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@@ -0,0 +1,173 @@
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<!doctype html>
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<html lang="es">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>claude_pipe · chat (TUI parseada)</title>
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<style>
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:root {
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--bg: #0b0e14; --panel: #11151f; --border: #1f2633;
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--user: #1e3a5f; --assist: #161b27; --text: #e6e9ef;
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--muted: #7c8597; --accent: #0ea5e9;
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}
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* { box-sizing: border-box; }
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html, body { height: 100%; margin: 0; }
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body {
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background: var(--bg); color: var(--text);
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font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
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display: flex; flex-direction: column; height: 100vh;
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}
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header {
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padding: 12px 18px; border-bottom: 1px solid var(--border);
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display: flex; align-items: center; gap: 10px; background: var(--panel);
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}
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header .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); }
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header h1 { font-size: 14px; margin: 0; font-weight: 600; }
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header .sub { font-size: 12px; color: var(--muted); margin-left: auto; }
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#log {
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flex: 1; overflow-y: auto; padding: 18px;
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display: flex; flex-direction: column; gap: 12px;
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}
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.msg { max-width: 760px; padding: 10px 14px; border-radius: 12px; white-space: pre-wrap; word-wrap: break-word; }
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.msg.user { align-self: flex-end; background: var(--user); border: 1px solid #285183; }
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.msg.assistant { align-self: flex-start; background: var(--assist); border: 1px solid var(--border); font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 14px; }
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.msg.assistant.pending::after { content: "▋"; color: var(--accent); animation: blink 1s steps(2) infinite; }
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.msg .role { font-size: 11px; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .5px; }
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.msg.err { align-self: center; background: #3a1620; border: 1px solid #7f1d1d; color: #fecaca; font-size: 13px; }
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@keyframes blink { 50% { opacity: 0; } }
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form {
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display: flex; gap: 10px; padding: 14px 18px; border-top: 1px solid var(--border); background: var(--panel);
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}
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#prompt {
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flex: 1; resize: none; background: var(--bg); color: var(--text);
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border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; font: inherit;
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}
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#prompt:focus { outline: none; border-color: var(--accent); }
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button {
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background: var(--accent); color: #04121d; border: none; border-radius: 10px;
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padding: 0 18px; font-weight: 600; cursor: pointer;
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}
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button:disabled { opacity: .5; cursor: default; }
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.hint { font-size: 11px; color: var(--muted); padding: 0 18px 10px; background: var(--panel); }
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</style>
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</head>
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<body>
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<header>
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<span class="dot"></span>
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<h1>claude_pipe · chat</h1>
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<span class="sub">respuesta parseada de la TUI de claude, vía SSE</span>
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</header>
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<div id="log">
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<div class="msg assistant">
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<div class="role">sistema</div>Escribe un mensaje. Cada turno lanza una sesión nueva de claude (sin memoria entre mensajes) y muestra su respuesta en streaming, parseada desde la TUI.
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</div>
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</div>
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<form id="form">
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<textarea id="prompt" rows="2" placeholder="Escribe tu mensaje… (Enter envía, Shift+Enter salto de línea)" autofocus></textarea>
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<button id="send" type="submit">Enviar</button>
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</form>
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<div class="hint">Cada mensaje = una captura PTY → vt_render → parse_claude_tui. Sin memoria entre turnos. Hay ~8s de warmup+idle antes de la primera respuesta.</div>
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<script>
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const log = document.getElementById('log');
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const form = document.getElementById('form');
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const promptEl = document.getElementById('prompt');
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const sendBtn = document.getElementById('send');
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let busy = false;
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function addMsg(role, text, cls) {
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const div = document.createElement('div');
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div.className = 'msg ' + (cls || role);
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const r = document.createElement('div');
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r.className = 'role';
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r.textContent = role;
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div.appendChild(r);
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div.appendChild(document.createTextNode(text || ''));
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log.appendChild(div);
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log.scrollTop = log.scrollHeight;
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return div;
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}
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function setBody(div, text) {
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// Keep the .role child, replace the trailing text node.
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while (div.childNodes.length > 1) div.removeChild(div.lastChild);
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div.appendChild(document.createTextNode(text));
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log.scrollTop = log.scrollHeight;
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}
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form.addEventListener('submit', (e) => {
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e.preventDefault();
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send();
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});
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promptEl.addEventListener('keydown', (e) => {
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if (e.key === 'Enter' && !e.shiftKey) {
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e.preventDefault();
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send();
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}
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});
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function send() {
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if (busy) return;
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const prompt = promptEl.value.trim();
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if (!prompt) return;
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addMsg('tú', prompt, 'user');
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promptEl.value = '';
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setBusy(true);
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const bubble = addMsg('claude', '', 'assistant');
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bubble.classList.add('pending');
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let acc = '';
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const es = new EventSource('/chat?prompt=' + encodeURIComponent(prompt));
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es.onmessage = (ev) => {
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let obj;
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try { obj = JSON.parse(ev.data); } catch { return; }
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if (obj.type === 'text_delta') {
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acc += obj.text || '';
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setBody(bubble, acc);
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} else if (obj.type === 'result') {
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// The result carries the authoritative final answer (clean last frame).
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if (obj.result) { acc = obj.result; setBody(bubble, acc); }
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}
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};
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es.addEventListener('done', () => {
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bubble.classList.remove('pending');
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if (!acc) setBody(bubble, '(respuesta vacía)');
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es.close();
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setBusy(false);
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});
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es.addEventListener('error', (ev) => {
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let msg = 'error de conexión';
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try { const o = JSON.parse(ev.data); if (o.message) msg = o.message; } catch {}
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bubble.classList.remove('pending');
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if (!acc) { addMsg('error', msg, 'err'); bubble.remove(); }
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es.close();
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setBusy(false);
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});
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es.onerror = () => {
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// Network-level error / stream closed unexpectedly.
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if (busy) {
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bubble.classList.remove('pending');
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es.close();
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setBusy(false);
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}
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};
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}
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function setBusy(b) {
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busy = b;
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sendBtn.disabled = b;
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sendBtn.textContent = b ? '…' : 'Enviar';
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if (!b) promptEl.focus();
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}
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</script>
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</body>
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</html>
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@@ -0,0 +1,140 @@
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// Command server is a browser chat playground for claude_pipe. It serves a small
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// single-page chat UI and, for each message, launches `claude_pipe --stream` as a
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// subprocess and relays its NDJSON events (text_delta + result) to the browser as
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// Server-Sent Events. The browser renders the answer token-chunk by token-chunk.
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//
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// This proves the whole stack end to end through a real surface: the PTY capture,
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// the VT render, the TUI parser (with the spinner fix), and the streaming delta —
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// all driving a live chat in the browser.
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//
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// Each message is an independent one-shot claude session: claude_pipe does not keep
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// conversation context between turns, so the chat has no memory across messages.
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//
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// Run:
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//
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// cd apps/claude_pipe && CGO_ENABLED=1 go build -tags fts5 -o claude_pipe .
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// cd playground && go run ./web # then open http://localhost:8099
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package main
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import (
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"bufio"
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_ "embed"
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"flag"
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"fmt"
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"log"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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)
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//go:embed index.html
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var indexHTML []byte
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var (
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binPath string
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root string
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warmup string
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idle string
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maxDur string
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)
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func main() {
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port := flag.String("port", "8099", "port to listen on")
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bin := flag.String("bin", "/home/enmanuel/fn_registry/apps/claude_pipe/claude_pipe", "path to the claude_pipe binary")
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rootDir := flag.String("root", "/home/enmanuel/fn_registry", "cwd for claude (a repo whose MCP servers are approved)")
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wu := flag.String("warmup", "4s", "claude_pipe --warmup")
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id := flag.String("idle", "4s", "claude_pipe --idle")
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md := flag.String("max", "120s", "claude_pipe --max")
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flag.Parse()
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abs, err := filepath.Abs(*bin)
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if err != nil {
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log.Fatalf("resolve --bin: %v", err)
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}
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if _, err := os.Stat(abs); err != nil {
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log.Fatalf("claude_pipe binary not found at %s — build it first:\n (cd .. && CGO_ENABLED=1 go build -tags fts5 -o claude_pipe .)", abs)
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}
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binPath, root, warmup, idle, maxDur = abs, *rootDir, *wu, *id, *md
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http.HandleFunc("/", handleIndex)
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http.HandleFunc("/chat", handleChat)
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addr := ":" + *port
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log.Printf("claude_pipe web chat → http://localhost:%s (bin=%s root=%s)", *port, binPath, root)
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log.Fatal(http.ListenAndServe(addr, nil))
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}
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func handleIndex(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/" {
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http.NotFound(w, r)
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return
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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_, _ = w.Write(indexHTML)
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}
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// handleChat runs claude_pipe --stream for the given prompt and relays each NDJSON
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// line as a Server-Sent Event. The browser opens this via EventSource.
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func handleChat(w http.ResponseWriter, r *http.Request) {
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prompt := r.URL.Query().Get("prompt")
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if prompt == "" {
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http.Error(w, "missing prompt", http.StatusBadRequest)
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return
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}
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flusher, ok := w.(http.Flusher)
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if !ok {
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http.Error(w, "streaming unsupported", http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "text/event-stream")
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w.Header().Set("Cache-Control", "no-cache")
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w.Header().Set("Connection", "keep-alive")
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w.Header().Set("X-Accel-Buffering", "no")
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// The request context is cancelled when the browser closes the EventSource;
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// CommandContext then kills the claude_pipe subprocess (and its PTY child).
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cmd := exec.CommandContext(r.Context(), binPath,
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"--stream",
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"--cwd", root,
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"--warmup", warmup,
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"--idle", idle,
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"--max", maxDur,
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prompt,
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)
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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sse(w, flusher, "error", fmt.Sprintf(`{"message":%q}`, err.Error()))
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return
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}
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cmd.Stderr = os.Stderr
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if err := cmd.Start(); err != nil {
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sse(w, flusher, "error", fmt.Sprintf(`{"message":%q}`, err.Error()))
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return
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}
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sc := bufio.NewScanner(stdout)
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sc.Buffer(make([]byte, 1024*1024), 1024*1024)
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for sc.Scan() {
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// Each line is already a JSON object ({"type":"text_delta",...} or result).
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// Relay it verbatim as the SSE data payload.
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sse(w, flusher, "", sc.Text())
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}
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_ = cmd.Wait()
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// Signal completion so the browser can close the stream.
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sse(w, flusher, "done", "{}")
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}
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// sse writes one Server-Sent Event. If event is empty, a default "message" event
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// is emitted (what EventSource.onmessage receives).
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func sse(w http.ResponseWriter, f http.Flusher, event, data string) {
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if event != "" {
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fmt.Fprintf(w, "event: %s\n", event)
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}
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fmt.Fprintf(w, "data: %s\n\n", data)
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f.Flush()
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}
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Reference in New Issue
Block a user