Log number of provided devices.

lib/roles/provider.js

@@ -14,6 +14,7 @@ module.exports = function(options) {
   var client = Promise.promisifyAll(adb.createClient())
   var workers = Object.create(null)
   var tracker = new events.EventEmitter()
+  var counter = 0
 
   // Output
   var push = zmq.socket('push')
@@ -102,6 +103,7 @@ module.exports = function(options) {
       function exitListener(code, signal) {
         var data = workers[device.id]
         delete workers[device.id]
+        counter -= 1
         switch (code) {
           case 0:
             log.info('Device worker "%s" stopped cleanly', device.id)
@@ -160,6 +162,9 @@ module.exports = function(options) {
           proc.removeListener('exit', exitListener)
         }
       }
+
+      counter += 1
+      boast()
       return true
     }
     return false
@@ -201,6 +206,8 @@ module.exports = function(options) {
     function onExit() {
       delete workers[id]
       log.info('Gracefully killed device worker "%s"', id)
+      counter -= 1
+      boast()
       deferred.resolve()
     }
 
@@ -222,6 +229,8 @@ module.exports = function(options) {
     function onExit() {
       delete workers[id]
       log.warn('Force killed device worker "%s"', id)
+      counter -= 1
+      boast()
       deferred.resolve()
     }
 
@@ -253,6 +262,10 @@ module.exports = function(options) {
       })
   }
 
+  function boast() {
+    log.info('Providing %d device(s)', counter)
+  }
+
   process.on('SIGINT', function(e) {
     log.info('Received SIGINT')
     gracefullyExit()