80 lines
2.1 KiB
TypeScript
80 lines
2.1 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 = 'edge5cdab'
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const REGISTER_COUNT = 100
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type Edge5iiModbusMetric = {
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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 toFloatCDAB(reg0: number, reg1: number): number {
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const buf = Buffer.allocUnsafe(4)
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buf.writeUInt16BE(reg1, 0)
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buf.writeUInt16BE(reg0, 2)
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return buf.readFloatBE(0)
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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 ${values.length}`)
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}
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}
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function toMetrics(values: number[], timestamp: string): Edge5iiModbusMetric[] {
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const metrics: Edge5iiModbusMetric[] = []
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for (let i = 0; i < values.length; i += 2) {
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const tag = `register-${String(i).padStart(3, '0')}`
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const value = toFloatCDAB(values[i], values[i + 1])
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if (isNaN(value)) {
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log(
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`${EDGE}.modbus: не удалось собрать число для ${tag}, ` +
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`исходные values[${i}]=${values[i]}, values[${i + 1}]=${values[i + 1]}, пропуск`,
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)
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continue
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};
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metrics.push({
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edge: EDGE,
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timestamp,
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tag,
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value,
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})
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}
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return metrics
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}
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async function postMetrics(metrics: Edge5iiModbusMetric[]): Promise<void> {
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for (const metric of metrics) {
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const response = await postCloudIngest(metric)
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if (!response.ok) {
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const text = await response.text()
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throw new Error(text)
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}
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}
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log(`${EDGE}.modbus.posted ${metrics.length} metrics`)
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}
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export const handle: TopicHandler = async (topic, payload) => {
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const timestamp = new Date().toISOString()
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log(`${EDGE}.modbus.received ${topic} ${payload.length} bytes`)
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const values = parseValues(payload)
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const metrics = toMetrics(values, timestamp);
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await postMetrics(metrics)
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}
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