ZacharyZhang-NYandClaude Opus 5.5
b34562333b
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
60 lines
2.1 KiB
JavaScript
60 lines
2.1 KiB
JavaScript
// Streams the wasm, runs Go, shows crashes.
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const stderr = []
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function crash (msg) {
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const why = [msg, stderr.join('').slice(-4000)].filter(Boolean).join('\n\n')
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console.error('crychic: crash', why)
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document.getElementById('why').textContent = why
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document.getElementById('over').hidden = false
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}
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document.getElementById('reload').onclick = () => location.reload()
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async function load () {
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if (!globalThis.Go || !globalThis.fs) throw new Error('wasm_exec.js did not load.')
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const write = globalThis.fs.writeSync.bind(globalThis.fs)
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globalThis.fs.writeSync = (fd, buf) => {
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if (fd === 2) stderr.push(new TextDecoder().decode(buf))
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return write(fd, buf)
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}
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const t0 = performance.now()
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const res = await fetch('__WASM__')
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if (!res.ok) throw new Error(`${res.url}: HTTP ${res.status}`)
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const total = Number('__SIZE__')
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const reader = res.body.getReader()
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const parts = []
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let got = 0
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for (;;) {
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const { done, value } = await reader.read()
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if (done) break
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parts.push(value)
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got += value.length
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const pct = Math.min(100, Math.floor(got / total * 100))
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document.getElementById('fill').style.width = pct + '%'
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document.getElementById('loading').setAttribute('aria-valuenow', pct)
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}
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const bytes = new Uint8Array(got)
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let off = 0
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for (const p of parts) {
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bytes.set(p, off)
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off += p.length
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}
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const go = new Go()
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const { instance } = await WebAssembly.instantiate(bytes, go.importObject)
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go.run(instance).then(() => crash('The Go program exited.'), (err) => crash(String(err && err.stack || err)))
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await new Promise((resolve, reject) => {
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const until = performance.now() + 30000
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const poll = () => {
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if (window.__crychic?.ready) return resolve()
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if (performance.now() > until) return reject(new Error('No frame within 30 s.'))
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requestAnimationFrame(poll)
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}
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poll()
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})
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const first = Math.round(performance.now() - t0)
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document.getElementById('loading').remove()
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window.__crychicBoot = { wasm: '__WASM__', bytes: got, first }
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console.info(`crychic: wasm ${(got / 1e6).toFixed(1)} MB, first frame ${first} ms`)
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}
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load().catch((err) => crash(String(err && err.stack || err)))
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