feat: implement WebSocket server for real-time sensor data handling and add sensor status update routes

realtime/src/store/influx.js

@@ -0,0 +1,65 @@
+const { InfluxDB, Point } = require('@influxdata/influxdb-client');
+
+const client = new InfluxDB({
+    url: process.env.INFLX_URL,
+    token: process.env.INFLX_TOKEN,
+});
+
+const bucket = process.env.INFLX_BUCKET || 'sensors';
+const org = process.env.INFLX_ORG;
+
+const writeApi = client.getWriteApi(org, bucket, 'ms', {
+    flushInterval: 100,
+    batchSize: 50,
+});
+
+const fieldMap = {
+    t: 'temperature',
+    h: 'humidity',
+    spd: 'speed',
+    cog: 'cog',
+    sog: 'sog',
+    hdg: 'headingTrue',
+    lat: 'latitude',
+    lon: 'longitude',
+};
+
+function writeSensorData(fields, sensor, session, timestamp) {
+    const point = new Point('sensor_data')
+        .tag('sensor', sensor)
+        .tag('session', session)
+        .timestamp(timestamp);
+
+    for (const [short, long] of Object.entries(fieldMap)) {
+        if (fields[short] !== undefined) {
+            point.floatField(long, fields[short]);
+        }
+    }
+
+    writeApi.writePoint(point);
+}
+
+async function queryHistory(sensor, session, since) {
+    const queryApi = client.getQueryApi(org);
+    const query = `
+        from(bucket: "${bucket}")
+            |> range(start: ${since})
+            |> filter(fn: (r) => r._measurement == "sensor_data")
+            |> filter(fn: (r) => r.sensor == "${sensor}")
+            |> filter(fn: (r) => r.session == "${session}")
+            |> pivot(rowKey:["_time"], columnKey: ["_field"], valueColumn: "_value")
+    `;
+
+    const rows = [];
+    return new Promise((resolve, reject) => {
+        queryApi.queryRows(query, {
+            next(row, tableMeta) {
+                rows.push(tableMeta.toObject(row));
+            },
+            error: reject,
+            complete() { resolve(rows); },
+        });
+    });
+}
+
+module.exports = { writeSensorData, queryHistory };

realtime/src/store/redis.js

@@ -1,6 +1,6 @@
 const redis = require('ioredis');
 
-const connectionsToken = "snsr_pending_token";
+const connectionsToken = "sensors_pending";
 const connectedSensorsKey = "sensors";
 
 
@@ -122,4 +122,12 @@ async function queryAll(from) {
 
 configure();
 
-module.exports = { checkRedis, appendAsConnection, createConnectionToken, consumeConnectionToken, query, queryAll };
+async function hset(key, ...args) {
+    return client.hset(key, ...args);
+}
+
+async function del(key) {
+    return client.del(key);
+}
+
+module.exports = { checkRedis, appendAsConnection, createConnectionToken, consumeConnectionToken, query, queryAll, hset, del };