56 lines
1.4 KiB
TypeScript
56 lines
1.4 KiB
TypeScript
import { postCloudIngest } from '../cloud-ingest.js'
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import { log } from '../helpers/log.js'
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import type { TopicHandler } from '../types.js'
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const EDGE = 'edge5i'
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const REGISTER_COUNT = 100
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type DemoModbusMetric = {
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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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function parseValues(payload: Buffer): number[] {
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const values = JSON.parse(payload.toString('utf8')) as number[]
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assertRegisterCount(values)
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return values
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}
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function assertRegisterCount(values: number[]): void {
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if (values.length !== REGISTER_COUNT) {
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throw new Error(`Expected ${REGISTER_COUNT} modbus values, got ${values.length}`)
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}
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}
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function toMetrics(values: number[], timestamp: string): DemoModbusMetric[] {
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return values.map((value, index) => ({
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edge: EDGE,
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timestamp,
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tag: `register-${String(index).padStart(3, '0')}`,
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value,
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}))
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}
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async function postMetrics(metrics: DemoModbusMetric[]): Promise<void> {
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for (const metric of metrics) {
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const response = await postCloudIngest(metric)
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if (!response.ok) {
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const text = await response.text()
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throw new Error(text)
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}
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}
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log(`${EDGE}.modbus.posted ${metrics.length} metrics`)
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}
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export const handle: TopicHandler = async (topic, payload) => {
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log(`${EDGE}.modbus.received ${topic} ${payload.length} bytes`)
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const values = parseValues(payload)
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const metrics = toMetrics(values, new Date().toISOString())
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await postMetrics(metrics)
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}
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