44 lines
1.3 KiB
JavaScript
44 lines
1.3 KiB
JavaScript
/**
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* Keep database waits and long scans visible without logging every record.
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* update() also checks elapsed time when a synchronous loop delays timers.
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*/
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export function createProgress({ log = console.log, intervalMs = 5000, now = Date.now } = {}) {
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if (!Number.isSafeInteger(intervalMs) || intervalMs < 1) throw new Error('进度输出间隔必须为正整数毫秒');
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let message = '';
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let startedAt;
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let lastOutput;
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let closed = false;
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function output(force = false) {
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if (closed || !message) return;
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const current = now();
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if (!force && lastOutput !== undefined && current - lastOutput < intervalMs) return;
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lastOutput = current;
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const seconds = Math.max(0, Math.floor((current - startedAt) / 1000));
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log(message + '（已用时 ' + seconds + ' 秒）');
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}
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const timer = setInterval(() => output(), intervalMs);
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timer.unref?.();
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return {
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stage(value) {
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if (closed) return;
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message = String(value ?? '').trim();
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startedAt = now();
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output(true);
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},
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update(value) {
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if (closed) return;
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message = String(value ?? '').trim();
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if (startedAt === undefined) startedAt = now();
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output();
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},
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close() {
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if (closed) return;
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closed = true;
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clearInterval(timer);
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},
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};
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}
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