feat(browser): add browserNoActivity configuration

Add a new configuration option `browserNoActivityTimeout` with a default value of 10000 ms. If, during the execution, Karma does not receive any message from a browser within `browserNoActivityTimeout`, it disconnects the browser.

docs/config/01-configuration-file.md

@@ -105,6 +105,16 @@ Usually any disconnection is considered as a failure, but this option allows to
 a flaky network link between the karma server and the browsers.
 
 
+## browserNoActivityTimeout
+**Type:** Number
+
+**Default:** `10000`
+
+**Description:** How long does Karma wait for a message from a browser before disconnecting it (in ms).
+
+If, during the execution, Karma does not receive any message from a browser within `browserNoActivityTimeout` ms, it will disconnect the browser.
+
+
 ## browsers
 **Type:** Array
 

lib/browser.js

@@ -22,7 +22,8 @@ var DISCONNECTED = 5;
 
 
 var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter, socket, timer,
-    /* config.browserDisconnectTimeout */ disconnectDelay) {
+    /* config.browserDisconnectTimeout */ disconnectDelay,
+    /* config.browserNoActivityTimeout */ noActivityTimeout) {
 
   var name = helper.browserFullNameToShort(fullName);
   var log = logger.create(name);
@@ -33,6 +34,33 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
     }).join(', ');
   };
 
+  var self = this;
+  var pendingDisconnect;
+  var disconnect = function(reason) {
+    self.state = DISCONNECTED;
+    self.disconnectsCount++;
+    log.warn('Disconnected (%d times)' + (reason || ''), self.disconnectsCount);
+    collection.remove(self);
+  };
+
+  var noActivityTimeoutId;
+  var refreshNoActivityTimeout = noActivityTimeout ? function() {
+    clearNoActivityTimeout();
+    noActivityTimeoutId = timer.setTimeout(function() {
+      self.lastResult.totalTimeEnd();
+      self.lastResult.disconnected = true;
+      disconnect(', because no message in ' + noActivityTimeout + ' ms.');
+      emitter.emit('browser_complete', self);
+    }, noActivityTimeout);
+  } : function() {};
+
+  var clearNoActivityTimeout = noActivityTimeout ? function() {
+    if (noActivityTimeoutId) {
+      timer.clearTimeout(noActivityTimeoutId);
+      noActivityTimeoutId = null;
+    }
+  } : function() {};
+
   this.id = id;
   this.fullName = fullName;
   this.name = name;
@@ -68,6 +96,8 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
 
     this.lastResult.error = true;
     emitter.emit('browser_error', this, error);
+
+    refreshNoActivityTimeout();
   };
 
   this.onInfo = function(info) {
@@ -83,6 +113,8 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
     if (helper.isDefined(info.log)) {
       emitter.emit('browser_log', this, info.log, info.type);
     }
+
+    refreshNoActivityTimeout();
   };
 
   this.onStart = function(info) {
@@ -94,6 +126,7 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
     }
 
     emitter.emit('browser_start', this, info);
+    refreshNoActivityTimeout();
   };
 
   this.onComplete = function(result) {
@@ -110,17 +143,10 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
 
     emitter.emit('browsers_change', collection);
     emitter.emit('browser_complete', this, result);
-  };
 
-  var self = this;
-  var disconnect = function() {
-    self.state = DISCONNECTED;
-    self.disconnectsCount++;
-    log.warn('Disconnected (%d times)', self.disconnectsCount);
-    collection.remove(self);
+    clearNoActivityTimeout();
   };
 
-  var pendingDisconnect;
   this.onDisconnect = function(_, disconnectedSocket) {
     activeSockets.splice(activeSockets.indexOf(disconnectedSocket), 1);
 
@@ -141,6 +167,8 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
         disconnect();
         emitter.emit('browser_complete', self);
       }, disconnectDelay);
+
+      clearNoActivityTimeout();
     }
   };
 
@@ -166,6 +194,8 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
     if (pendingDisconnect) {
       timer.clearTimeout(pendingDisconnect);
     }
+
+    refreshNoActivityTimeout();
   };
 
   this.onResult = function(result) {
@@ -181,6 +211,7 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
     this.lastResult.add(result);
 
     emitter.emit('spec_complete', this, result);
+    refreshNoActivityTimeout();
   };
 
   this.serialize = function() {
@@ -197,6 +228,7 @@ var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter,
     });
 
     this.state = EXECUTING;
+    refreshNoActivityTimeout();
   };
 };
 

lib/config.js

@@ -214,6 +214,7 @@ var Config = function() {
   };
   this.browserDisconnectTimeout = 2000;
   this.browserDisconnectTolerance = 0;
+  this.browserNoActivityTimeout = 10000;
 };
 
 var CONFIG_SYNTAX_HELP = '  module.exports = function(config) {\n' +

test/unit/browser.spec.coffee

@@ -464,3 +464,20 @@ describe 'Browser', ->
       socket.emit 'result', {success: true, suite: [], log: []}
       expect(browser.lastResult.success).to.equal 1
 
+
+    it 'disconnect when no message during the run', ->
+      timer = createMockTimer()
+      browser = new Browser 'fake-id', 'Chrome 31.0', collection, emitter, socket, timer, 10, 20
+      browser.init()
+      browser.execute()
+
+      spyBrowserComplete = sinon.spy()
+      emitter.on 'browser_complete', spyBrowserComplete
+
+      socket.emit 'start', {total: 11}
+      socket.emit 'result', {success: true, suite: [], log: []}
+
+      timer.wind 20
+      expect(browser.state).to.equal Browser.STATE_DISCONNECTED
+      expect(browser.disconnectsCount).to.equal 1
+      expect(spyBrowserComplete).to.have.been.called