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import { Interface } from '../index.js'
import { formatUnit } from '../units.js'
import { writeFile } from 'fs/promises'
function filterProp(
prop: Record<string, string | number | boolean | null>
): Record<string, string | number | boolean> {
const filteredProp: Record<string, string | number | boolean> = {}
for (const [key, value] of Object.entries(prop)) {
if (value !== null) {
filteredProp[key] = value
}
}
return filteredProp
}
export default function createInterface(
file: string = (() => {
const file = process.env.JSON_OUTPUT_FILE
if (!file) {
throw new Error('env var JSON_OUTPUT_FILE is not set')
}
return file
})()
): Interface {
const metrics = new Map<
string,
{
key: Record<string, string | number>
value: number
unit: string
count: number
relativeTo?: string
}
>()
const iface: Interface = {
measurement: async (scenario, props, name, value, unit, relativeTo) => {
const keyObject = {
scenario: scenario,
...filterProp(props),
name: name,
}
const key = JSON.stringify(keyObject)
const current = metrics.get(key)
if (current) {
current.value += value
current.count++
} else {
metrics.set(key, {
key: keyObject,
value,
unit: unit,
count: 1,
relativeTo,
})
}
},
finish: async () => {
await writeFile(
file,
JSON.stringify(
[...metrics.values()].map(
({ key, value, unit, count, relativeTo }) => {
return {
key,
value: value / count,
unit,
text: formatUnit(value / count, unit),
datapoints: count,
relativeTo,
}
}
)
)
)
},
}
return iface
}
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