first version

app.js

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+const assert = require('assert');
+assert.ok(process.env.JAMBONES_MYSQL_HOST &&
+    process.env.JAMBONES_MYSQL_USER &&
+    process.env.JAMBONES_MYSQL_PASSWORD &&
+    process.env.JAMBONES_MYSQL_DATABASE, 'missing JAMBONES_MYSQL_XXX env vars');
+assert.ok(process.env.JAMBONES_REDIS_HOST, 'missing JAMBONES_REDIS_HOST env var');
+assert.ok(process.env.DRACHTIO_HOST, 'missing DRACHTIO_HOST env var');
+assert.ok(process.env.DRACHTIO_PORT, 'missing DRACHTIO_PORT env var');
+assert.ok(process.env.DRACHTIO_SECRET, 'missing DRACHTIO_SECRET env var');
+const opts = Object.assign({
+  timestamp: () => { return `, "time": "${new Date().toISOString()}"`; }
+}, { level: process.env.JAMBONES_LOGLEVEL || 'info' });
+const logger = require('pino')(opts);
+const Srf = require('drachtio-srf');
+const srf = new Srf();
+const setName = `${(process.env.JAMBONES_CLUSTER_ID || 'default')}:active-sip`;
+
+const {
+  lookupAllVoipCarriers,
+  lookupSipGatewaysByCarrier,
+} = require('@jambonz/db-helpers')({
+  host: process.env.JAMBONES_MYSQL_HOST,
+  user: process.env.JAMBONES_MYSQL_USER,
+  password: process.env.JAMBONES_MYSQL_PASSWORD,
+  database: process.env.JAMBONES_MYSQL_DATABASE,
+  connectionLimit: process.env.JAMBONES_MYSQL_CONNECTION_LIMIT || 10
+}, logger);
+
+const {
+  retrieveSet } = require('@jambonz/realtimedb-helpers')({
+  host: process.env.JAMBONES_REDIS_HOST || 'localhost',
+  port: process.env.JAMBONES_REDIS_PORT || 6379
+}, logger);
+
+srf.locals = {
+  ...srf.locals,
+  dbHelpers: {
+    lookupAllVoipCarriers,
+    lookupSipGatewaysByCarrier,
+  },
+  realtimeDbHelpers: {
+    retrieveSet
+  }
+};
+
+srf.connect({ host: process.env.DRACHTIO_HOST, port: process.env.DRACHTIO_PORT, secret: process.env.DRACHTIO_SECRET });
+srf.on('connect', (err, hp) => {
+  const ativateRegBot = async(err, hp) => {
+    if (err) return logger.error({ err }, 'Error connecting to drachtio server');
+    logger.info(`connected to drachtio listening on ${hp}`);
+    // Only run when I'm the first member in the set Of Actip Sip SBC
+    const set = await retrieveSet(setName);
+    const newArray = Array.from(set);
+    let startRegBot = !newArray || newArray.length == 0;
+    if (!startRegBot) {
+      const firstSbc = newArray.at(0);
+      const hostports = hp.split(',');
+      for (const hp of hostports) {
+        const arr = /^(.*)\/(.*:\d+)$/.exec(hp);
+        if (firstSbc === arr[2]) {
+          startRegBot = true;
+          break;
+        }
+      }
+    }
+    if (startRegBot) {
+      srf.locals.regbotStatus = require('./lib/sip-trunk-register')(logger, srf);
+    } else {
+      // Timer 30 seconds to make sure the task is transfered to another SBC outbound handler
+      setTimeout(ativateRegBot.bind(this, err, hp), 30 * 1000);
+    }
+  };
+  ativateRegBot(err, hp);
+});
+
+if (process.env.NODE_ENV === 'test') {
+  srf.on('error', (err) => {
+    logger.info(err, 'Error connecting to drachtio');
+  });
+}
+
+module.exports = { srf, logger };