85 lines
2.8 KiB
TypeScript
85 lines
2.8 KiB
TypeScript
import { performance } from 'node:perf_hooks'
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import type { Command, State } from '../src/types/screen.js'
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export function parseCommand(value: unknown): Command {
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if (!value || typeof value !== 'object') throw new Error('Некорректная команда')
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const c = value as Record<string, unknown>
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if (
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typeof c.id !== 'string' ||
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!/^[a-zA-Z0-9-]{1,80}$/.test(c.id) ||
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typeof c.action !== 'string' ||
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!['play', 'pause', 'stop', 'seek'].includes(c.action) ||
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typeof c.media !== 'string' ||
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!['audio', 'video'].includes(c.media) ||
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typeof c.position !== 'number' ||
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!Number.isFinite(c.position) ||
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c.position < 0 ||
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c.position > 60
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) {
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throw new Error('Некорректная команда')
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}
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return {
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id: c.id,
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action: c.action as Command['action'],
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media: c.media as Command['media'],
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position: c.position,
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}
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}
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export class Controller {
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state: State = { revision: 0, command: null, status: 'idle', error: '', samples: [] }
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private seen = new Set<string>()
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private startedAt = 0
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constructor(private publish: (state: State) => void) {}
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command(input: unknown) {
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const command = parseCommand(input)
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if (this.seen.has(command.id)) return
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this.seen.add(command.id)
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// shortcut: помним 4096 команд стенда; долговременная дедупликация — SCREEN-004.
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if (this.seen.size > 4096) this.seen.delete(this.seen.values().next().value!)
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this.startedAt = performance.now()
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this.state = {
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...this.state,
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revision: this.state.revision + 1,
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command,
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status: 'pending',
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error: '',
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}
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this.publish(this.state)
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}
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report(input: unknown) {
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if (!input || typeof input !== 'object') throw new Error('Некорректный отчёт')
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const r = input as Record<string, unknown>
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if (
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typeof r.status !== 'string' ||
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!['playing', 'paused', 'stopped', 'ended', 'error'].includes(r.status) ||
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typeof r.id !== 'string' ||
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(r.error !== undefined && typeof r.error !== 'string')
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)
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throw new Error('Некорректный отчёт')
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if (
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r.id !== this.state.command?.id ||
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(this.state.status !== 'pending' && r.status !== 'ended' && r.status !== 'error')
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)
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return
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const samples =
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r.status === 'playing' && this.state.command.action === 'play'
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? [
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...this.state.samples.slice(-399),
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{
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media: this.state.command.media,
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milliseconds: performance.now() - this.startedAt,
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},
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]
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: this.state.samples
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this.state = {
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...this.state,
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revision: this.state.revision + 1,
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status: r.status as State['status'],
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error: String(r.error ?? '').slice(0, 500),
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samples,
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}
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this.publish(this.state)
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}
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}
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