a5bfc1eecc
Uses a simple counter for span ids, previously these required to be randomly generated but I've changed the importer script to ensure it gets prepended `0`s to make sure it gets to 16 characters which Jaeger requires. ## Bug - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Errors have helpful link attached, see `contributing.md` ## Feature - [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [ ] Errors have helpful link attached, see `contributing.md` ## Documentation / Examples - [ ] Make sure the linting passes by running `yarn lint`
113 lines
2.5 KiB
TypeScript
113 lines
2.5 KiB
TypeScript
import { SpanId } from './shared'
|
|
import { reporter } from './report'
|
|
|
|
const NUM_OF_MICROSEC_IN_SEC = BigInt('1000')
|
|
let count = 0
|
|
const getId = () => {
|
|
count++
|
|
return count
|
|
}
|
|
|
|
// eslint typescript has a bug with TS enums
|
|
/* eslint-disable no-shadow */
|
|
export enum SpanStatus {
|
|
Started,
|
|
Stopped,
|
|
}
|
|
|
|
export class Span {
|
|
name: string
|
|
id: SpanId
|
|
parentId?: SpanId
|
|
duration: number | null
|
|
attrs: { [key: string]: any }
|
|
status: SpanStatus
|
|
|
|
_start: bigint
|
|
|
|
constructor({
|
|
name,
|
|
parentId,
|
|
attrs,
|
|
startTime,
|
|
}: {
|
|
name: string
|
|
parentId?: SpanId
|
|
startTime?: bigint
|
|
attrs?: Object
|
|
}) {
|
|
this.name = name
|
|
this.parentId = parentId
|
|
this.duration = null
|
|
this.attrs = attrs ? { ...attrs } : {}
|
|
this.status = SpanStatus.Started
|
|
this.id = getId()
|
|
this._start = startTime || process.hrtime.bigint()
|
|
}
|
|
|
|
// Durations are reported as microseconds. This gives 1000x the precision
|
|
// of something like Date.now(), which reports in milliseconds.
|
|
// Additionally, ~285 years can be safely represented as microseconds as
|
|
// a float64 in both JSON and JavaScript.
|
|
stop(stopTime?: bigint) {
|
|
const end: bigint = stopTime || process.hrtime.bigint()
|
|
const duration = (end - this._start) / NUM_OF_MICROSEC_IN_SEC
|
|
this.status = SpanStatus.Stopped
|
|
if (duration > Number.MAX_SAFE_INTEGER) {
|
|
throw new Error(`Duration is too long to express as float64: ${duration}`)
|
|
}
|
|
const timestamp = this._start / NUM_OF_MICROSEC_IN_SEC
|
|
reporter.report(
|
|
this.name,
|
|
Number(duration),
|
|
Number(timestamp),
|
|
this.id,
|
|
this.parentId,
|
|
this.attrs
|
|
)
|
|
}
|
|
|
|
traceChild(name: string, attrs?: Object) {
|
|
return new Span({ name, parentId: this.id, attrs })
|
|
}
|
|
|
|
manualTraceChild(
|
|
name: string,
|
|
startTime: bigint,
|
|
stopTime: bigint,
|
|
attrs?: Object
|
|
) {
|
|
const span = new Span({ name, parentId: this.id, attrs, startTime })
|
|
span.stop(stopTime)
|
|
}
|
|
|
|
setAttribute(key: string, value: any) {
|
|
this.attrs[key] = String(value)
|
|
}
|
|
|
|
traceFn(fn: any) {
|
|
try {
|
|
return fn()
|
|
} finally {
|
|
this.stop()
|
|
}
|
|
}
|
|
|
|
async traceAsyncFn<T>(fn: () => T | Promise<T>): Promise<T> {
|
|
try {
|
|
return await fn()
|
|
} finally {
|
|
this.stop()
|
|
}
|
|
}
|
|
}
|
|
|
|
export const trace = (
|
|
name: string,
|
|
parentId?: SpanId,
|
|
attrs?: { [key: string]: string }
|
|
) => {
|
|
return new Span({ name, parentId, attrs })
|
|
}
|
|
|
|
export const flushAllTraces = () => reporter.flushAll()
|