russell@unturf.com
df154b9a56
Tab switching during a long-running eval used to silently abandon
the calc — output stopped streaming, no snapshot, nothing to come
back to. Now setActiveTab pauses the outgoing tab's eval (and
optionally portal-saves the env), terminates the worker, and on
re-entry hydrates + re-fires the original input.
Pieces:
* serve-coop.py + make serve-repl — dev server that emits
Cross-Origin-Opener-Policy: same-origin and
Cross-Origin-Embedder-Policy: require-corp so SharedArrayBuffer
is constructable in the browser. Same headers production needs.
* C tier eval-loop pause poll — c/eval.c grows lumbda_check_pause(),
guarded by #ifdef LUMBDA_WASM. Called at the top of leval()'s
while(1); masked to every 1024th iteration so the polling cost
stays under noise floor. When the JS-library import
js_lumbda_pause_requested returns 1, lisp_error("paused")
longjmps out so module-global env survives intact for the
portal-snapshot that follows.
* SAB plumbing — main thread allocates new SharedArrayBuffer(4),
hands it through worker config → runner.setPauseFlag →
lumbda-c.loader.setPauseFlag → globalThis._lumbdaCPauseFlag.
Atomics.store / Atomics.load on index 0 is the signalling
channel. Falls back to null when COOP/COEP isn't isolated, in
which case pause degrades to a hard worker.terminate().
* autoPauseTab() — on setActiveTab away, snapshots the tier
(C tier with SAB) or hard-cancels (other tiers / no SAB),
stashes tab.autoPause = {tier, blob, inputSrc, savedAt},
terminates the workers so the heap is reclaimed.
* autoResumeTab() — on setActiveTab into a tab with autoPause,
reboots the tier, hydrates MEMFS, runs (portal-load! ...), then
re-fires the original input via sendInput so the eval restarts
from the saved state. Asm + Python paths re-run from scratch
until their poll sites land.
Also closes two UX papercuts from fox: chip ⇣ export icon bumped
from 0.85em muted to 1em green so it's actually discoverable; the
scope toggle now reads "scope: this tab" / "scope: all tabs" so the
button label describes the state rather than a target.
115 lines
5.6 KiB
HTML
115 lines
5.6 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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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>lumbda repl — three tiers, persistent sessions</title>
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<link rel="stylesheet" href="style.css">
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<link rel="stylesheet" href="repl.css">
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<script type="importmap">
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{
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"imports": {
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"@codemirror/state": "https://esm.sh/*@codemirror/state@6.4.1",
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"@codemirror/view": "https://esm.sh/*@codemirror/view@6.34.1",
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"@codemirror/commands": "https://esm.sh/*@codemirror/commands@6.6.2",
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"@codemirror/language": "https://esm.sh/*@codemirror/language@6.10.3",
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"@codemirror/legacy-modes/mode/scheme": "https://esm.sh/*@codemirror/legacy-modes@6.4.1/mode/scheme",
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"@codemirror/theme-one-dark": "https://esm.sh/*@codemirror/theme-one-dark@6.1.2",
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"@lezer/highlight": "https://esm.sh/*@lezer/highlight@1.2.1",
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"@lezer/common": "https://esm.sh/*@lezer/common@1.2.3",
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"style-mod": "https://esm.sh/*style-mod@4.1.2",
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"crelt": "https://esm.sh/*crelt@1.0.6",
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"w3c-keyname": "https://esm.sh/*w3c-keyname@2.2.8"
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}
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}
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</script>
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</head>
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<body class="repl">
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<header>
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<a class="brand" href="../" aria-label="lumbda home">
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<img class="logo" src="lumbda-logo-green.png" alt="" aria-hidden="true">
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<h1 aria-label="lumbda.">lumbda<span class="period" aria-hidden="true">.</span></h1>
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</a>
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<p class="tagline">three tiers, persistent sessions</p>
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</header>
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<div id="lock-screen" class="lock-screen">
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<div class="lock-card">
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<h2>unlock</h2>
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<p>type a password to unlock or create a vault. every keystroke and
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transcript line stays inside your browser — nothing leaves
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this tab.</p>
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<details class="lock-explain">
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<summary>how the encryption works</summary>
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<ul>
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<li>your password is run through <strong>PBKDF2</strong> (200,000
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iterations, SHA-256) with a random 32-byte salt generated
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once per device and stored in <code>localStorage</code>.</li>
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<li>that derives an <strong>AES-GCM 256-bit key</strong>. all
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transcripts are encrypted with this key before any
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<code>localStorage.setItem()</code> call.</li>
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<li>the <strong>vault id</strong> is
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<code>SHA-256(password || salt)</code> — different
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passwords on the same device address completely independent
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vaults. wrong password = decryption fails, you don't see
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other vaults' contents.</li>
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<li>same protocol as <a href="https://unsandbox.com/blog/vault-encryption-design"
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target="_blank">unsandbox's vault design</a>, implemented
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on the native <code>crypto.subtle</code> API instead of a
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shipped CryptoJS bundle. source:
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<a href="crypto.js" target="_blank"><code>crypto.js</code></a>.</li>
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<li>passwords are never sent anywhere — not to lumbda.com,
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not to a backend, not to a worker. nothing to leak in
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transit because nothing transits.</li>
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<li><strong>ephemeral</strong> skips the vault entirely —
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nothing is written to disk; closing the tab loses everything.
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use this on a shared machine when persistence would be a
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footgun.</li>
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</ul>
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</details>
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<input id="password" type="password" autocomplete="off" autofocus placeholder="password">
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<div class="lock-row">
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<button id="unlock" class="primary">unlock vault</button>
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<button id="fresh" class="secondary" title="skip the vault, run ephemerally — transcripts vanish on reload">ephemeral</button>
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</div>
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<p class="lock-note" id="lock-note"></p>
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</div>
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</div>
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<main id="repl-stream" class="repl-stream" hidden>
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<section class="tabbar" id="tabbar">
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<div class="tabs" id="tabs"></div>
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<button id="new-tab" class="ghost" title="new repl session">+</button>
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<span class="spacer"></span>
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<button id="reset-tier" class="ghost" title="reboot the worker for the current tab — state lost">↻ reboot tier</button>
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<button id="clear-log" class="ghost" title="clear the transcript">clear log</button>
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<button id="cancel" class="ghost" disabled>cancel</button>
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<button id="lock" class="ghost" title="lock vault — passes back to lock screen">lock</button>
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</section>
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<section class="portal-bar" id="portal-bar">
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<span class="portal-label" title="save the current tab's tier state to your encrypted vault. comes back exactly the same after a tab close + reopen.">portals:</span>
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<button id="portal-save" class="ghost" title="save tier state — names the snapshot by date+time">💾 save</button>
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<button id="portal-import" class="ghost" title="import a .portal.json file">📁 import</button>
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<button id="portal-scope" class="ghost" title="toggle between this tab's checkpoints and every tab's">scope: this tab 📂</button>
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<input id="portal-import-file" type="file" accept=".json,.portal,application/json" hidden>
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<div id="portal-chips" class="portal-chips"></div>
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</section>
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<div id="transcript" class="transcript"></div>
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<div class="prompt-bar" id="prompt-bar">
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<span class="prompt-sigil">λ></span>
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<textarea id="input" rows="1" spellcheck="false"
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placeholder="(+ 1 2)"></textarea>
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<select id="tier-select" title="which tier evaluates this input">
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<option value="python">python (pyodide)</option>
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<option value="c" selected>c (emcc)</option>
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<option value="asm">asm (wat)</option>
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<option value="all">all three (race)</option>
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</select>
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<button id="send" class="primary">send</button>
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</div>
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</main>
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<script type="module" src="repl.js"></script>
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</body>
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</html>
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