45 lines
1.0 KiB
TypeScript
45 lines
1.0 KiB
TypeScript
import { readFileSync } from 'node:fs'
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export type MappedMetric = {
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edge: string
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timestamp: string
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tag: string
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value: number
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}
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type MappingConfig = {
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edge: string
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tags: string[]
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}
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export type MetricMapper = {
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edge: string
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mapValues: (values: number[], timestamp: string) => MappedMetric[]
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}
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type MetricMapperOptions = {
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// filePath contract:
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// - built-in mappings are passed as URL via new URL('../mappings/*.json', import.meta.url);
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// - env overrides are expected as absolute paths inside the runtime container.
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filePath: string | URL
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}
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function readMappingConfig(filePath: string | URL): MappingConfig {
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return JSON.parse(readFileSync(filePath, 'utf8')) as MappingConfig
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}
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export function createMetricMapper(options: MetricMapperOptions): MetricMapper {
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const config = readMappingConfig(options.filePath)
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return {
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edge: config.edge,
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mapValues: (values, timestamp) =>
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values.map((value, index) => ({
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edge: config.edge,
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timestamp,
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tag: config.tags[index],
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value,
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})),
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}
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}
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