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to-json.ts
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to-json.ts
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import { randomBytes } from 'crypto'
import { traceGlobals } from '../shared'
import fs from 'fs'
import path from 'path'
import { PHASE_DEVELOPMENT_SERVER } from '../../shared/lib/constants'
const localEndpoint = {
serviceName: 'nextjs',
ipv4: '127.0.0.1',
port: 9411,
}
type Event = {
traceId: string
parentId?: number
name: string
id: number
timestamp: number
duration: number
localEndpoint?: typeof localEndpoint
tags?: Object
startTime?: number
}
// Batch events as zipkin allows for multiple events to be sent in one go
export function batcher(reportEvents: (evts: Event[]) => Promise<void>) {
const events: Event[] = []
// Promise queue to ensure events are always sent on flushAll
const queue = new Set()
return {
flushAll: async () => {
await Promise.all(queue)
if (events.length > 0) {
await reportEvents(events)
events.length = 0
}
},
report: (event: Event) => {
events.push(event)
if (events.length > 100) {
const evts = events.slice()
events.length = 0
const report = reportEvents(evts)
queue.add(report)
report.then(() => queue.delete(report))
}
},
}
}
let writeStream: RotatingWriteStream
let traceId: string
let batch: ReturnType<typeof batcher> | undefined
const writeStreamOptions = {
flags: 'a',
encoding: 'utf8',
}
class RotatingWriteStream {
file: string
writeStream!: fs.WriteStream
size: number
sizeLimit: number
private rotatePromise: Promise<void> | undefined
private drainPromise: Promise<void> | undefined
constructor(file: string, sizeLimit: number) {
this.file = file
this.size = 0
this.sizeLimit = sizeLimit
this.createWriteStream()
}
private createWriteStream() {
this.writeStream = fs.createWriteStream(this.file, writeStreamOptions)
}
// Recreate the file
private async rotate() {
await this.end()
try {
fs.unlinkSync(this.file)
} catch (err: any) {
// It's fine if the file does not exist yet
if (err.code !== 'ENOENT') {
throw err
}
}
this.size = 0
this.createWriteStream()
this.rotatePromise = undefined
}
async write(data: string): Promise<void> {
if (this.rotatePromise) await this.rotatePromise
this.size += data.length
if (this.size > this.sizeLimit) {
await (this.rotatePromise = this.rotate())
}
if (!this.writeStream.write(data, 'utf8')) {
if (this.drainPromise === undefined) {
this.drainPromise = new Promise<void>((resolve, _reject) => {
this.writeStream.once('drain', () => {
this.drainPromise = undefined
resolve()
})
})
}
await this.drainPromise
}
}
end(): Promise<void> {
return new Promise((resolve) => {
this.writeStream.end(resolve)
})
}
}
const reportToLocalHost = (
name: string,
duration: number,
timestamp: number,
id: number,
parentId?: number,
attrs?: Object,
startTime?: number
) => {
const distDir = traceGlobals.get('distDir')
const phase = traceGlobals.get('phase')
if (!distDir || !phase) {
return
}
if (!traceId) {
traceId = process.env.TRACE_ID || randomBytes(8).toString('hex')
}
if (!batch) {
batch = batcher(async (events) => {
if (!writeStream) {
await fs.promises.mkdir(distDir, { recursive: true })
const file = path.join(distDir, 'trace')
writeStream = new RotatingWriteStream(
file,
// Development is limited to 50MB, production is unlimited
phase === PHASE_DEVELOPMENT_SERVER ? 52428800 : Infinity
)
}
const eventsJson = JSON.stringify(events)
try {
await writeStream.write(eventsJson + '\n')
} catch (err) {
console.log(err)
}
})
}
batch.report({
traceId,
parentId,
name,
id,
timestamp,
duration,
tags: attrs,
startTime,
})
}
export default {
flushAll: () =>
batch
? batch.flushAll().then(() => {
const phase = traceGlobals.get('phase')
// Only end writeStream when manually flushing in production
if (phase !== PHASE_DEVELOPMENT_SERVER) {
writeStream.end()
}
})
: undefined,
report: reportToLocalHost,
}