add support for autoscaling SBC SIP servers; bugfix: synthAudio calls must past stats obj

lib/utils/install-srf-locals.js

@@ -135,6 +135,7 @@ function installSrfLocals(srf, logger) {
     retrieveSet,
     addToSet,
     removeFromSet,
+    monitorSet,
     pushBack,
     popFront,
     removeFromList,
@@ -178,6 +179,7 @@ function installSrfLocals(srf, logger) {
       retrieveSet,
       addToSet,
       removeFromSet,
+      monitorSet,
       pushBack,
       popFront,
       removeFromList,

lib/utils/sbc-pinger.js

@@ -7,13 +7,15 @@ const debug = require('debug')('jambonz:feature-server');
 module.exports = (logger) => {
   logger = logger || noopLogger;
   let idxSbc = 0;
+  let sbcs = [];
 
-  assert.ok(process.env.JAMBONES_SBCS, 'missing JAMBONES_SBCS env var');
-  const sbcs = process.env.JAMBONES_SBCS
-    .split(',')
-    .map((sbc) => sbc.trim());
-  assert.ok(sbcs.length, 'JAMBONES_SBCS env var is empty or misconfigured');
-  logger.info({sbcs}, 'SBC inventory');
+  if (process.env.JAMBONES_SBCS) {
+    sbcs = process.env.JAMBONES_SBCS
+      .split(',')
+      .map((sbc) => sbc.trim());
+    assert.ok(sbcs.length, 'JAMBONES_SBCS env var is empty or misconfigured');
+    logger.info({sbcs}, 'SBC inventory');
+  }
 
   // listen for SNS lifecycle changes
   let lifecycleEmitter = new Emitter();
@@ -96,8 +98,19 @@ module.exports = (logger) => {
   }, 20000);
 
   // initial ping once we are up
-  setTimeout(() => {
+  setTimeout(async() => {
     const {srf} = require('../..');
+
+    // if SBCs are auto-scaling, monitor them as they come and go
+    if (!process.env.JAMBONES_SBCS) {
+      const {monitorSet} = srf.locals.dbHelpers;
+      const setName = `${(process.env.JAMBONES_CLUSTER_ID || 'default')}:active-sip`;
+      await monitorSet(setName, 10, (members) => {
+        sbcs = members;
+        logger.info(`sbc-pinger: SBC roster has changed, list of active SBCs is now ${sbcs}`);
+      });
+    }
+
     pingProxies(srf);
   }, 1000);