Implemented InfluxPointWriter for writing into influx with stream

src/streamHandler/InfluxPointWriter.js

@@ -0,0 +1,38 @@
+const logger = require.main.require("./helper/logger.js")("InfluxPointWriter");
+const { Writeable } = require('stream');
+const {InfluxDB, Point, HttpError} = require('@influxdata/influxdb-client')
+
+/**
+ * Get points and write them into influx
+ */
+class InfluxPointWriter extends Writeable{
+    /**
+     * 
+     * @param {string} url Influx-Url
+     * @param {string} token Auth-token
+     * @param {string} org Organization to use
+     * @param {string} bucket Bucket to use
+     * @param {string} precision Precision to use
+     */
+    constructor(url, token, org, bucket, precision = 'us'){
+        this._api = new InfluxDB({url, token}).getWriteApi(org, bucket, precision);
+    }
+
+    _write(point, encoding, next){
+        this._api.writePoint(point);
+        next();
+    }
+
+    _flush(next){
+        this._api.flush(true)
+            .then(
+                next,
+                (err) => { next(new Error(`WriteApi rejected promise for flush: ${err}`)); }
+            );
+    }
+}
+
+// Specify exports
+module.exports = {
+    InfluxPointWriter
+};