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logger.js
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logger.js
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import process from 'node:process'
import EventEmitter from 'node:events'
import prettyMs from 'pretty-ms'
import indent from 'indent-string'
export default class Logger extends EventEmitter {
constructor(overrides) {
super()
Object.assign(this, overrides)
}
measure(startEvent) {
const startTime = process.hrtime()
this.log(startEvent)
return (endEvent) => {
const endTime = process.hrtime(startTime)
const duration = endTime[0] * 1e3 + endTime[1] * 1e-6
this.log({
...startEvent,
...endEvent,
message: `${startEvent.message} › ${endEvent.message}`,
duration,
})
}
}
log(event) {
event = {
...event,
time: Date.now(),
}
this.emit('log', event, this.format(event))
}
format(event) {
const timestamp = new Date(event.time).toISOString()
let line = `[${timestamp}] [${event.level}] [${event.topic}] ${event.message}`
if (event.duration) {
line += ` (${prettyMs(event.duration)})`
}
if (event.error) {
line += `\n${indent(event.error.stack, 4)}`
}
return line
}
}