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245
docs/sw.js
245
docs/sw.js
@@ -1,244 +1 @@
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const TARGET_SUBSTRING = "openrouter.ai/api/v1/chat/completions";
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const THREADS_KEY = "threads_v1";
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const SAVE_BYTES_THRESHOLD = 6 * 1024;
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const SAVE_TIME_THRESHOLD = 800;
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const BROADCAST_THROTTLE_MS = 600;
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const DB_NAME = "localforage";
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const STORE_NAME = "keyvaluepairs";
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const gid = () => Math.random().toString(36).slice(2, 9) + "-" + Date.now().toString(36);
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const now = () => Date.now();
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function openLFDB() {
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return new Promise((resolve, reject) => {
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const req = indexedDB.open(DB_NAME);
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req.onsuccess = (e) => resolve(e.target.result);
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req.onerror = (e) => reject(e.target.error || new Error("open error"));
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});
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}
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async function idbGetRaw(key) {
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const db = await openLFDB();
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const tx = db.transaction(STORE_NAME, "readonly");
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const store = tx.objectStore(STORE_NAME);
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return await new Promise((res, rej) => {
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const r = store.get(key);
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r.onsuccess = (ev) => res(ev.target.result);
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r.onerror = (ev) => rej(ev.target.error || new Error("get error"));
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});
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}
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async function idbPutRaw(key, value) {
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const db = await openLFDB();
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const tx = db.transaction(STORE_NAME, "readwrite");
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const store = tx.objectStore(STORE_NAME);
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return await new Promise((res, rej) => {
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const r = store.put({ key, value });
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r.onsuccess = () => res(true);
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r.onerror = (ev) => rej(ev.target.error || new Error("put error"));
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});
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}
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async function idbGetThreads() {
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const rec = await idbGetRaw(THREADS_KEY).catch((err) => {
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throw err;
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});
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if (!rec) return [];
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return Array.isArray(rec.value) ? rec.value : [];
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}
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async function idbWriteThreads(arr) {
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await idbPutRaw(THREADS_KEY, arr);
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}
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function pickLastThread(threads) {
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if (!threads || threads.length === 0) return null;
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const sorted = [...threads].sort((a, b) => (b.updatedAt || 0) - (a.updatedAt || 0));
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return sorted[0];
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}
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function upsertAssistantInThreadObj(threadObj, streamId, text) {
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threadObj.updatedAt = now();
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for (let i = threadObj.messages.length - 1; i >= 0; i--) {
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const m = threadObj.messages[i];
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if (m && m.sw_streamId === streamId) {
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m.content = text;
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m.contentParts = [{ type: "text", text }];
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m.updatedAt = now();
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m._sw_savedAt = now();
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return threadObj;
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}
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}
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const msg = {
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id: "swmsg-" + gid(),
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role: "assistant",
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content: text,
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contentParts: [{ type: "text", text }],
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kind: "assistant",
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sw_saved: true,
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sw_streamId: streamId,
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createdAt: now(),
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updatedAt: now(),
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_sw_savedAt: now()
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};
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threadObj.messages.push(msg);
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return threadObj;
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}
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async function safeFlushLastThread(streamId, accumulated, meta = {}) {
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const threads = await idbGetThreads();
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let thread = pickLastThread(threads);
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const ts = now();
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if (!thread) {
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thread = { id: "sw-thread-" + gid(), title: "Missed while backgrounded", pinned: false, updatedAt: ts, messages: [] };
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threads.unshift(thread);
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}
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upsertAssistantInThreadObj(thread, streamId, accumulated);
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await idbWriteThreads(threads);
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return { ok: true, threadId: thread.id };
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}
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async function broadcast(msg) {
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try {
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const cl = await self.clients.matchAll({ includeUncontrolled: true, type: "window" });
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for (const c of cl) {
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try {
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c.postMessage(msg);
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} catch (_) {
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}
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}
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} catch (_) {
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}
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}
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self.addEventListener("install", (ev) => self.skipWaiting());
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self.addEventListener("activate", (ev) => ev.waitUntil(self.clients.claim()));
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self.addEventListener("fetch", (event) => {
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try {
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const url = String(event.request.url || "");
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if (!url.includes(TARGET_SUBSTRING)) return;
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event.respondWith((async () => {
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const upstream = await fetch(event.request);
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if (!upstream || !upstream.body) return upstream;
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const streamId = "sw-" + gid();
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const meta = { url, startedAt: now(), bytes: 0, status: "started" };
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broadcast({ type: "sw-intercept-start", streamId, meta });
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const [clientStream, swStream] = upstream.body.tee();
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const savePromise = (async () => {
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const reader = swStream.getReader();
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const decoder = new TextDecoder("utf-8");
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let accumulated = "";
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let sinceSaveBytes = 0;
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let lastSaveAt = 0;
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let lastBroadcastAt = 0;
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async function maybeFlush(force = false) {
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try {
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const nowMs = now();
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if (!force && sinceSaveBytes < SAVE_BYTES_THRESHOLD && nowMs - lastSaveAt < SAVE_TIME_THRESHOLD) return;
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await safeFlushLastThread(streamId, accumulated, { bytes: meta.bytes });
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sinceSaveBytes = 0;
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lastSaveAt = nowMs;
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if (nowMs - lastBroadcastAt > BROADCAST_THROTTLE_MS) {
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lastBroadcastAt = nowMs;
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broadcast({ type: "sw-intercept-progress", streamId, meta: { bytes: meta.bytes, savedAt: lastSaveAt, snippet: accumulated.slice(-1024) } });
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}
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} catch (err) {
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broadcast({ type: "sw-intercept-error", streamId, meta: { error: String(err && err.message ? err.message : err) } });
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}
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}
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try {
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while (true) {
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const { value, done } = await reader.read();
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if (done) break;
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let chunk = "";
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try {
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chunk = decoder.decode(value, { stream: true });
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} catch (e) {
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chunk = "";
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}
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accumulated += chunk;
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const bytes = value ? value.byteLength || 0 : chunk.length;
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meta.bytes += bytes;
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sinceSaveBytes += bytes;
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await maybeFlush(false);
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}
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await maybeFlush(true);
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meta.status = "finished";
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meta.endedAt = now();
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broadcast({ type: "sw-intercept-end", streamId, meta: { totalBytes: meta.bytes, endedAt: meta.endedAt } });
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} catch (err) {
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meta.status = "error";
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meta.error = String(err && err.message ? err.message : err);
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broadcast({ type: "sw-intercept-error", streamId, meta: { error: meta.error } });
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}
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})();
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event.waitUntil(savePromise);
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return new Response(clientStream, { status: upstream.status, statusText: upstream.statusText, headers: upstream.headers });
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})());
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} catch (err) {
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broadcast({ type: "sw-debug", text: "fetch handler error: " + String(err && err.message ? err.message : err) });
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}
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});
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self.addEventListener("message", (event) => {
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const data = event.data || {};
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(async () => {
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try {
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if (data.type === "PING") {
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if (event.ports && event.ports[0]) event.ports[0].postMessage({ type: "PONG", ts: now(), ok: true });
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else broadcast({ type: "PONG", ts: now(), ok: true });
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return;
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}
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if (data.type === "PING_STATUS") {
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const reply = { type: "PONG_STATUS", ts: now() };
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if (event.ports && event.ports[0]) event.ports[0].postMessage(reply);
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else broadcast(reply);
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return;
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}
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if (data.type === "TEST_WRITE") {
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try {
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const threads = await idbGetThreads();
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const tid = "sw-test-" + gid();
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const nowMs = now();
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const testThread = { id: tid, title: "SW test " + new Date(nowMs).toISOString(), pinned: false, updatedAt: nowMs, messages: [{ id: "swtest-" + gid(), role: "assistant", content: "sw test write @" + new Date(nowMs).toISOString(), contentParts: [{ type: "text", text: "sw test write" }], createdAt: nowMs, updatedAt: nowMs }] };
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threads.unshift(testThread);
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await idbWriteThreads(threads);
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const res = { type: "TEST_WRITE_RESULT", ok: true, tid };
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if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
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else broadcast(res);
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} catch (err) {
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const res = { type: "TEST_WRITE_RESULT", ok: false, error: String(err && err.message ? err.message : err) };
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if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
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else broadcast(res);
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}
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return;
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}
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if (data.type === "READ_KEY") {
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const key = data.key || THREADS_KEY;
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try {
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const rec = await idbGetRaw(key);
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const val = rec ? rec.value : null;
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const res = { type: "READ_KEY_RESULT", ok: true, key, value: val };
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if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
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else broadcast(res);
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} catch (err) {
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const res = { type: "READ_KEY_RESULT", ok: false, key, error: String(err && err.message ? err.message : err) };
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if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
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else broadcast(res);
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}
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return;
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}
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if (data.type === "LIST_SW_SAVED") {
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try {
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const threads = await idbGetThreads();
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const found = [];
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for (const t of threads || []) {
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for (const m of t.messages || []) {
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if (m && m.sw_streamId) found.push({ threadId: t.id, messageId: m.id, sw_streamId: m.sw_streamId, snippet: (m.content || "").slice(0, 200) });
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}
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}
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const res = { type: "LIST_SW_SAVED_RESULT", ok: true, found };
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if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
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else broadcast(res);
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} catch (err) {
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const res = { type: "LIST_SW_SAVED_RESULT", ok: false, error: String(err && err.message ? err.message : err) };
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if (event.ports && event.ports[0]) event.ports[0].postMessage(res);
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else broadcast(res);
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}
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return;
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}
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} catch (err) {
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const r = { type: "SW_ERROR", error: String(err && err.message ? err.message : err) };
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if (event.ports && event.ports[0]) event.ports[0].postMessage(r);
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else broadcast(r);
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}
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})();
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});
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