feat: Add possibility to stop a karma server

Add detached mode using the `karma start --detached` command.
Add middleware for stopping a server (detached or not).
Described the detached option.

docs/config/01-configuration-file.md

@@ -249,6 +249,18 @@ customHeaders: [{
 }]
 ```
 
+
+## detached
+**Type:** Boolean
+
+**Default:** `false`
+
+**CLI:** `--detached`
+
+**Description:** When true, this will start the karma server in another process, writing no output to the console.
+The server can be stopped using the `karma stop` command.
+
+
 ## exclude
 **Type:** Array
 

lib/cli.js

@@ -1,6 +1,7 @@
 var path = require('path')
 var optimist = require('optimist')
 var fs = require('graceful-fs')
+var spawn = require('child_process').spawn
 
 var Server = require('./server')
 var helper = require('./helper')
@@ -159,6 +160,7 @@ var describeStart = function () {
       '  $0 start [<configFile>] [<options>]')
     .describe('port', '<integer> Port where the server is running.')
     .describe('auto-watch', 'Auto watch source files and run on change.')
+    .describe('detached', 'Detach the server.')
     .describe('no-auto-watch', 'Do not watch source files.')
     .describe('log-level', '<disable | error | warn | info | debug> Level of logging.')
     .describe('colors', 'Use colors when reporting and printing logs.')
@@ -190,6 +192,17 @@ var describeRun = function () {
     .describe('no-colors', 'Do not use colors when reporting or printing logs.')
 }
 
+var describeStop = function () {
+  optimist
+    .usage('Karma - Spectacular Test Runner for JavaScript.\n\n' +
+      'STOP - Stop the server (requires running server).\n\n' +
+      'Usage:\n' +
+      '  $0 run [<configFile>] [<options>]')
+    .describe('port', '<integer> Port where the server is listening.')
+    .describe('log-level', '<disable | error | warn | info | debug> Level of logging.')
+    .describe('help', 'Print usage.')
+}
+
 var describeCompletion = function () {
   optimist
     .usage('Karma - Spectacular Test Runner for JavaScript.\n\n' +
@@ -199,6 +212,21 @@ var describeCompletion = function () {
     .describe('help', 'Print usage.')
 }
 
+var startServer = function (config) {
+  var args = process.argv
+  var detachedIndex = args.indexOf('--detached')
+  if (detachedIndex === -1) {
+    new Server(config).start()
+    return
+  }
+  args.splice(detachedIndex, 1)
+  var child = spawn(args[0], args.slice(1), {
+    detached: true,
+    stdio: ['ignore', 'ignore', 'ignore']
+  })
+  child.unref()
+}
+
 exports.process = function () {
   var argv = optimist.parse(argsBeforeDoubleDash(process.argv.slice(2)))
   var options = {
@@ -215,6 +243,10 @@ exports.process = function () {
       options.clientArgs = parseClientArgs(process.argv)
       break
 
+    case 'stop':
+      describeStop()
+      break
+
     case 'init':
       describeInit()
       break
@@ -243,11 +275,14 @@ exports.run = function () {
 
   switch (config.cmd) {
     case 'start':
-      new Server(config).start()
+      startServer(config)
       break
     case 'run':
       require('./runner').run(config)
       break
+    case 'stop':
+      require('./stopper').stop(config)
+      break
     case 'init':
       require('./init').init(config)
       break

lib/config.js

@@ -266,6 +266,7 @@ var Config = function () {
   this.concurrency = Infinity
   this.failOnEmptyTestSuite = true
   this.retryLimit = 2
+  this.detached = false
 }
 
 var CONFIG_SYNTAX_HELP = '  module.exports = function(config) {\n' +

lib/middleware/runner.js

@@ -1,5 +1,5 @@
 /**
- * Runner middleware is reponsible for communication with `karma run`.
+ * Runner middleware is responsible for communication with `karma run`.
  *
  * It basically triggers a test run and streams stdout back.
  */

lib/middleware/stopper.js

@@ -0,0 +1,18 @@
+/**
+ * Stopper middleware is responsible for communicating with `karma stop`.
+ */
+
+var log = require('../logger').create('middleware:stopper')
+
+var createStopperMiddleware = function (urlRoot) {
+  return function (request, response, next) {
+    if (request.url !== urlRoot + 'stop') return next()
+    response.writeHead(200)
+    log.info('Stopping server')
+    response.end('OK')
+    process.exit(0)
+  }
+}
+
+createStopperMiddleware.$inject = ['config.urlRoot']
+exports.create = createStopperMiddleware

lib/stopper.js

@@ -0,0 +1,33 @@
+var http = require('http')
+
+var cfg = require('./config')
+var logger = require('./logger')
+
+exports.stop = function (config) {
+  logger.setupFromConfig(config)
+  var log = logger.create('stopper')
+  config = cfg.parseConfig(config.configFile, config)
+  var options = {
+    hostname: config.hostname,
+    path: config.urlRoot + 'stop',
+    port: config.port,
+    method: 'GET'
+  }
+
+  var request = http.request(options)
+
+  request.on('response', function (response) {
+    log.info('Server stopped.')
+    process.exit(response.statusCode === 200 ? 0 : 1)
+  })
+
+  request.on('error', function (e) {
+    if (e.code === 'ECONNREFUSED') {
+      log.error('There is no server listening on port %d', options.port)
+      process.exit(1, e.code)
+    } else {
+      throw e
+    }
+  })
+  request.end()
+}

lib/web-server.js

@@ -7,6 +7,7 @@ var Promise = require('bluebird')
 
 var common = require('./middleware/common')
 var runnerMiddleware = require('./middleware/runner')
+var stopperMiddleware = require('./middleware/stopper')
 var stripHostMiddleware = require('./middleware/strip_host')
 var karmaMiddleware = require('./middleware/karma')
 var sourceFilesMiddleware = require('./middleware/source_files')
@@ -56,6 +57,7 @@ var createWebServer = function (injector, emitter, fileList) {
 
   var handler = connect()
     .use(injector.invoke(runnerMiddleware.create))
+    .use(injector.invoke(stopperMiddleware.create))
     .use(injector.invoke(stripHostMiddleware.create))
     .use(injector.invoke(karmaMiddleware.create))
     .use(injector.invoke(sourceFilesMiddleware.create))

test/e2e/steps/core_steps.js

@@ -15,19 +15,18 @@ module.exports = function coreSteps () {
   var cleansingNeeded = true
   var additionalArgs = []
 
-  var cleanseIfNeeded = (function (_this) {
-    return function () {
-      if (cleansingNeeded) {
-        try {
-          rimraf.sync(tmpDir)
-        } catch (e) {}
+  var cleanseIfNeeded = function () {
+    if (cleansingNeeded) {
+      try {
+        rimraf.sync(tmpDir)
+      } catch (e) {
+      }
 
-        cleansingNeeded = false
+      cleansingNeeded = false
 
-        return cleansingNeeded
-      }
+      return cleansingNeeded
     }
-  })(this)
+  }
 
   this.Given(/^a configuration with:$/, function (fileContent, callback) {
     cleanseIfNeeded()
@@ -40,17 +39,39 @@ module.exports = function coreSteps () {
     return callback()
   })
 
-  this.When(/^I (run|runOut|start|init) Karma$/, function (command, callback) {
+  this.When(/^I start a server in background/, function (callback) {
     this.writeConfigFile(tmpDir, tmpConfigFile, (function (_this) {
       return function (err, hash) {
         if (err) {
           return callback.fail(new Error(err))
         }
 
+        var configFile = path.join(tmpDir, hash + '.' + tmpConfigFile)
+        var runtimePath = path.join(baseDir, 'bin', 'karma')
+        _this.child = spawn('' + runtimePath, ['start', '--log-level', 'debug', configFile])
+        _this.child.stdout.on('data', function () {
+          callback()
+          callback = function () {
+          }
+        })
+        _this.child.on('exit', function (exitCode) {
+          _this.childExitCode = exitCode
+        })
+      }
+    })(this))
+  })
+
+  this.When(/^I (run|runOut|start|init|stop) Karma( with log-level ([a-z]+))?$/, function (command, withLogLevel, level, callback) {
+    this.writeConfigFile(tmpDir, tmpConfigFile, (function (_this) {
+      return function (err, hash) {
+        if (err) {
+          return callback.fail(new Error(err))
+        }
+        level = withLogLevel === undefined ? 'warn' : level
         var configFile = path.join(tmpDir, hash + '.' + tmpConfigFile)
         var runtimePath = path.join(baseDir, 'bin', 'karma')
         var execKarma = function (done) {
-          var cmd = runtimePath + ' ' + command + ' --log-level warn ' + configFile + ' ' + additionalArgs
+          var cmd = runtimePath + ' ' + command + ' --log-level ' + level + ' ' + configFile + ' ' + additionalArgs
 
           return exec(cmd, {
             cwd: baseDir
@@ -107,11 +128,10 @@ module.exports = function coreSteps () {
     })(this))
   })
 
-  this.Then(/^it passes with( no debug)?:$/, {timeout: 10 * 1000}, function (noDebug, expectedOutput, callback) {
-    noDebug = noDebug === ' no debug'
+  this.Then(/^it passes with( no debug| like)?:$/, {timeout: 10 * 1000}, function (mode, expectedOutput, callback) {
+    var noDebug = mode === ' no debug'
+    var like = mode === ' like'
     var actualOutput = this.lastRun.stdout.toString()
-    var actualError = this.lastRun.error
-    var actualStderr = this.lastRun.stderr.toString()
     var lines
 
     if (noDebug) {
@@ -120,12 +140,15 @@ module.exports = function coreSteps () {
       })
       actualOutput = lines.join('\n')
     }
+    if (like && actualOutput.indexOf(expectedOutput) >= 0) {
+      return callback()
+    }
 
     if (actualOutput.indexOf(expectedOutput) === 0) {
       return callback()
     }
 
-    if (actualError || actualStderr) {
+    if (actualOutput) {
       return callback(new Error('Expected output to match the following:\n  ' + expectedOutput + '\nGot:\n  ' + actualOutput))
     }
 
@@ -159,4 +182,12 @@ module.exports = function coreSteps () {
       callback(new Error('Expected output to match the following:\n  ' + expectedOutput + '\nGot:\n  ' + actualOutput))
     }
   })
+
+  this.Then(/^The server is dead( with exit code ([0-9]+))?$/, function (withExitCode, code, callback) {
+    setTimeout((function (_this) {
+      if (_this.childExitCode === undefined) return callback(new Error('Server has not exited.'))
+      if (code === undefined || parseInt(code, 10) === _this.childExitCode) return callback()
+      callback(new Error('Exit-code mismatch'))
+    })(this), 1000)
+  })
 }

test/e2e/stop.feature

@@ -0,0 +1,42 @@
+Feature: Stop karma
+  TODO write this
+
+  Scenario: A server can't be stopped if it isn't running
+    When I stop Karma
+    Then it fails with like:
+      """
+      ERROR \[stopper\]: There is no server listening on port [0-9]+
+      """
+
+  Scenario: A server can be stopped
+    Given a configuration with:
+      """
+      files = ['basic/plus.js', 'basic/test.js'];
+      browsers = ['PhantomJS'];
+      plugins = [
+        'karma-jasmine',
+        'karma-phantomjs-launcher'
+      ];
+      singleRun = false;
+      """
+    When I start a server in background
+    And I stop Karma
+    Then The server is dead with exit code 0
+
+  Scenario: A server can be stopped and give informative output
+    Given a configuration with:
+      """
+      files = ['basic/plus.js', 'basic/test.js'];
+      browsers = ['PhantomJS'];
+      plugins = [
+        'karma-jasmine',
+        'karma-phantomjs-launcher'
+      ];
+      singleRun = false;
+      """
+    When I start a server in background
+    And I stop Karma with log-level info
+    Then it passes with like:
+    """
+    Server stopped.
+    """