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Monorepo for Aesthetic.Computer aesthetic.computer
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667// Cross-process coordination for controllers running on this host. Never steal// an abandoned lease: a timed-out/terminated owner may have delivered input.import { mkdirSync, writeFileSync, rmSync, readdirSync, readFileSync } from "node:fs";import { join } from "node:path";import { homedir } from "node:os";import { createHash, randomUUID } from "node:crypto";import { AsyncLocalStorage } from "node:async_hooks";const held = new AsyncLocalStorage();const delay = ms => new Promise(resolve => setTimeout(resolve, ms));
export function machineLeaseKey(spec) { if (spec?.local) return "local"; const host = spec?.sshHost || spec?.ssh; if (!host) throw new Error("Native coordination needs an explicit machine transport"); return `remote:${host.split(/\s+/)[0].replace(/^[^@]+@/, "").toLowerCase()}`;}function tryAcquire(key, root) { mkdirSync(root, { recursive: true, mode: 0o700 }); const path = join(root, createHash("sha256").update(key).digest("hex").slice(0,32)); try { mkdirSync(path, { mode: 0o700 }); } catch (error) { if (error.code === "EEXIST") return null; throw error; } try { writeFileSync(join(path,"owner.json"), JSON.stringify({pid:process.pid,token:randomUUID(),since:new Date().toISOString()}), {mode:0o600}); } catch(error) { rmSync(path,{recursive:true,force:true});throw error; } return () => rmSync(path,{recursive:true,force:true});}function options(opts) { return {timeoutMs:1000,root:process.env.SLAB_INPUT_LEASE_DIR || join(homedir(),".local/share/slab/input-leases"),...opts};}export async function withMachineLease(spec, fn, opts = {}) { const key=machineLeaseKey(spec); if (held.getStore()?.has(key)) return fn(); const {timeoutMs,root}=options(opts), deadline=Date.now()+timeoutMs; let release; while (!(release=tryAcquire(key,root))) { if (Date.now()>=deadline) throw new Error(`Computer-use machine busy; no action sent. Inspect input leases in ${root} before clearing an abandoned owner.`); await delay(25); } const active=new Set(held.getStore() || []);active.add(key); try { return await held.run(active,fn); } finally { release(); }}export function withMachineLeaseSync(spec, fn, opts = {}) { const key=machineLeaseKey(spec); if (held.getStore()?.has(key)) return fn(); const {timeoutMs,root}=options(opts),deadline=Date.now()+timeoutMs; let release; while (!(release=tryAcquire(key,root))) { if (Date.now()>=deadline) throw new Error(`Computer-use machine busy; no action sent. Inspect input leases in ${root}.`); Atomics.wait(new Int32Array(new SharedArrayBuffer(4)),0,0,25); } const active=new Set(held.getStore() || []);active.add(key); try { return held.run(active,fn); } finally { release(); }}
export function inspectMachineLeases(opts = {}) { const {root}=options(opts); let names; try {names=readdirSync(root);} catch(error) {if(error.code==="ENOENT") return [];throw error;} return names.filter(name=>/^[a-f0-9]{32}$/.test(name)).map(id=>{ try { const owner=JSON.parse(readFileSync(join(root,id,"owner.json"),"utf8")); let alive=true; try {process.kill(owner.pid,0);} catch(error) {alive=error.code!=="ESRCH";} return {id,pid:owner.pid,since:owner.since,ownerAlive:alive}; } catch {return {id,ownerAlive:null};} });}