Added single instance policy

src/NzbDrone.App.Test/NzbDrone.Host.Test.csproj

@@ -60,6 +60,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="ContainerFixture.cs" />
+    <Compile Include="NzbDroneProcessServiceFixture.cs" />
     <Compile Include="RouterTest.cs" />
     <Compile Include="MonitoringProviderTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />

src/NzbDrone.App.Test/NzbDroneProcessServiceFixture.cs

@@ -0,0 +1,91 @@
+using System.Collections.Generic;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Common.Model;
+using NzbDrone.Common.Processes;
+using NzbDrone.Host;
+using NzbDrone.Test.Common;
+
+namespace NzbDrone.App.Test
+{
+    [TestFixture]
+    public class NzbDroneProcessServiceFixture : TestBase<SingleInstancePolicy>
+    {
+        private const int CURRENT_PROCESS_ID = 5;
+
+        [SetUp]
+        public void Setup()
+        {
+            Mocker.GetMock<IProcessProvider>().Setup(c => c.GetCurrentProcess())
+                .Returns(new ProcessInfo() { Id = CURRENT_PROCESS_ID });
+        }
+
+        [Test]
+        public void should_continue_if_only_instance()
+        {
+            Mocker.GetMock<IProcessProvider>()
+                .Setup(c => c.FindProcessByName(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME))
+                .Returns(new List<ProcessInfo>());
+
+            Mocker.GetMock<IProcessProvider>().Setup(c => c.FindProcessByName(ProcessProvider.NZB_DRONE_PROCESS_NAME))
+                .Returns(new List<ProcessInfo>
+                {
+                    new ProcessInfo{Id = CURRENT_PROCESS_ID}
+                });
+
+
+            Subject.EnforceSingleInstance();
+
+
+            Mocker.GetMock<IBrowserService>().Verify(c => c.LaunchWebUI(), Times.Never());
+
+        }
+
+        [Test]
+        public void should_enforce_if_another_console_is_running()
+        {
+            Mocker.GetMock<IProcessProvider>()
+                .Setup(c => c.FindProcessByName(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME))
+                    .Returns(new List<ProcessInfo>
+                {
+                    new ProcessInfo{Id = 10}
+                });
+
+            Mocker.GetMock<IProcessProvider>().Setup(c => c.FindProcessByName(ProcessProvider.NZB_DRONE_PROCESS_NAME))
+                .Returns(new List<ProcessInfo>
+                {
+                    new ProcessInfo{Id = CURRENT_PROCESS_ID}
+                });
+
+
+
+            Assert.Throws<TerminateApplicationException>(() => Subject.EnforceSingleInstance());
+            Mocker.GetMock<IBrowserService>().Verify(c => c.LaunchWebUI(), Times.Once());
+            ExceptionVerification.ExpectedWarns(1);
+        }
+
+        [Test]
+        public void should_return_false_if_another_gui_is_running()
+        {
+            Mocker.GetMock<IProcessProvider>()
+                .Setup(c => c.FindProcessByName(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME))
+                .Returns(new List<ProcessInfo>
+                {
+                      new ProcessInfo{Id = CURRENT_PROCESS_ID}
+                
+                });
+
+            Mocker.GetMock<IProcessProvider>().Setup(c => c.FindProcessByName(ProcessProvider.NZB_DRONE_PROCESS_NAME))
+                .Returns(new List<ProcessInfo>
+                {
+                      new ProcessInfo{Id = 10}
+                });
+
+
+
+            Assert.Throws<TerminateApplicationException>(() => Subject.EnforceSingleInstance());
+            Mocker.GetMock<IBrowserService>().Verify(c => c.LaunchWebUI(), Times.Once());
+            ExceptionVerification.ExpectedWarns(1);
+        }
+    }
+}

src/NzbDrone.Common/Processes/ProcessProvider.cs

@@ -15,6 +15,7 @@ public interface IProcessProvider
     {
         ProcessInfo GetCurrentProcess();
         ProcessInfo GetProcessById(int id);
+        List<ProcessInfo> FindProcessByName(string name);
         void OpenDefaultBrowser(string url);
         void WaitForExit(Process process);
         void SetPriority(int processId, ProcessPriorityClass priority);
@@ -74,6 +75,11 @@ public ProcessInfo GetProcessById(int id)
             return processInfo;
         }
 
+        public List<ProcessInfo> FindProcessByName(string name)
+        {
+            return Process.GetProcessesByName(name).Select(ConvertToProcessInfo).Where(c => c != null).ToList();
+        }
+
         public void OpenDefaultBrowser(string url)
         {
             Logger.Info("Opening URL [{0}]", url);
@@ -213,23 +219,29 @@ private static ProcessInfo ConvertToProcessInfo(Process process)
 
             process.Refresh();
 
+            ProcessInfo processInfo = null;
+
             try
             {
-                if (process.Id <= 0 || process.HasExited) return null;
+                if (process.Id <= 0) return null;
 
-                return new ProcessInfo
+                processInfo = new ProcessInfo();
+                processInfo.Id = process.Id;
+                processInfo.Name = process.ProcessName;
+                processInfo.StartPath = GetExeFileName(process);
+
+                if (process.HasExited)
                 {
-                    Id = process.Id,
-                    StartPath = GetExeFileName(process),
-                    Name = process.ProcessName
-                };
+                    processInfo = null;
+                }
             }
-            catch (Win32Exception)
+            catch (Win32Exception e)
             {
-                Logger.Warn("Coudn't get process info for " + process.ProcessName);
+                Logger.WarnException("Couldn't get process info for " + process.ProcessName, e);
             }
 
-            return null;
+            return processInfo;
+
         }
 
         private static string GetExeFileName(Process process)

src/NzbDrone.Console/ConsoleApp.cs

@@ -32,8 +32,10 @@ public static void Main(string[] args)
                     Thread.Sleep(1000);
                 }
             }
-            catch (TerminateApplicationException)
+            catch (TerminateApplicationException e)
             {
+                Logger.Info("Application has been terminated. Reason " + e.Reason);
+                return;
             }
             catch (Exception e)
             {

src/NzbDrone.Host/ApplicationServer.cs

@@ -1,8 +1,6 @@
-using System;
-using System.ServiceProcess;
+using System.ServiceProcess;
 using NLog;
 using NzbDrone.Common.EnvironmentInfo;
-using NzbDrone.Common.Processes;
 using NzbDrone.Core.Configuration;
 using NzbDrone.Host.Owin;
 
@@ -20,20 +18,20 @@ public class NzbDroneServiceFactory : ServiceBase, INzbDroneServiceFactory
         private readonly IConfigFileProvider _configFileProvider;
         private readonly IRuntimeInfo _runtimeInfo;
         private readonly IHostController _hostController;
-        private readonly IProcessProvider _processProvider;
         private readonly PriorityMonitor _priorityMonitor;
         private readonly IStartupArguments _startupArguments;
+        private readonly IBrowserService _browserService;
         private readonly Logger _logger;
 
-        public NzbDroneServiceFactory(IConfigFileProvider configFileProvider, IHostController hostController, IRuntimeInfo runtimeInfo,
-                           IProcessProvider processProvider, PriorityMonitor priorityMonitor, IStartupArguments startupArguments, Logger logger)
+        public NzbDroneServiceFactory(IConfigFileProvider configFileProvider, IHostController hostController, 
+            IRuntimeInfo runtimeInfo, PriorityMonitor priorityMonitor, IStartupArguments startupArguments, IBrowserService browserService, Logger logger)
         {
             _configFileProvider = configFileProvider;
             _hostController = hostController;
             _runtimeInfo = runtimeInfo;
-            _processProvider = processProvider;
             _priorityMonitor = priorityMonitor;
             _startupArguments = startupArguments;
+            _browserService = browserService;
             _logger = logger;
         }
 
@@ -50,15 +48,7 @@ public void Start()
                 _runtimeInfo.IsUserInteractive &&
                 _configFileProvider.LaunchBrowser)
             {
-                try
-                {
-                    _logger.Info("Starting default browser. {0}", _hostController.AppUrl);
-                    _processProvider.OpenDefaultBrowser(_hostController.AppUrl);
-                }
-                catch (Exception e)
-                {
-                    _logger.ErrorException("Failed to open URL in default browser.", e);
-                }
+                _browserService.LaunchWebUI();
             }
 
             _priorityMonitor.Start();

src/NzbDrone.Host/Bootstrap.cs

@@ -7,9 +7,11 @@
 
 namespace NzbDrone.Host
 {
-    public static class Bootstrap
+    public class Bootstrap
     {
-        public static IContainer Start(StartupArguments args, IUserAlert userAlert)
+        public IContainer Container { get; private set; }
+
+        public Bootstrap(StartupArguments args, IUserAlert userAlert)
         {
             var logger = NzbDroneLogger.GetLogger();
 
@@ -21,15 +23,25 @@ public static IContainer Start(StartupArguments args, IUserAlert userAlert)
 
             if (!PlatformValidation.IsValidate(userAlert))
             {
-                throw new TerminateApplicationException();
+                throw new TerminateApplicationException("Missing system requirements");
             }
 
-            var container = MainAppContainerBuilder.BuildContainer(args);
+            Container = MainAppContainerBuilder.BuildContainer(args);
 
-            DbFactory.RegisterDatabase(container);
-            container.Resolve<Router>().Route();
 
-            return container;
         }
+
+        public void Start()
+        {
+            DbFactory.RegisterDatabase(Container);
+            Container.Resolve<Router>().Route();
+        }
+
+
+        public void EnsureSingleInstance()
+        {
+            Container.Resolve<ISingleInstancePolicy>().EnforceSingleInstance();
+        }
+
     }
 }

src/NzbDrone.Host/BrowserService.cs

@@ -0,0 +1,40 @@
+using System;
+using NLog;
+using NzbDrone.Common.Processes;
+using NzbDrone.Core.Configuration;
+
+namespace NzbDrone.Host
+{
+    public interface IBrowserService
+    {
+        void LaunchWebUI();
+    }
+
+    public class BrowserService : IBrowserService
+    {
+        private readonly IProcessProvider _processProvider;
+        private readonly IConfigFileProvider _configFileProvider;
+        private readonly Logger _logger;
+
+        public BrowserService(IProcessProvider processProvider, IConfigFileProvider configFileProvider, Logger logger)
+        {
+            _processProvider = processProvider;
+            _configFileProvider = configFileProvider;
+            _logger = logger;
+        }
+
+        public void LaunchWebUI()
+        {
+            var url = string.Format("http://localhost:{0}", _configFileProvider.Port);
+            try
+            {
+                _logger.Info("Starting default browser. {0}", url);
+                _processProvider.OpenDefaultBrowser(url);
+            }
+            catch (Exception e)
+            {
+                _logger.ErrorException("Couldn't open defult browser to " + url, e);
+            }
+        }
+    }
+}

src/NzbDrone.Host/NzbDrone.Host.csproj

@@ -116,6 +116,8 @@
     </Compile>
     <Compile Include="AccessControl\FirewallAdapter.cs" />
     <Compile Include="AccessControl\UrlAclAdapter.cs" />
+    <Compile Include="BrowserService.cs" />
+    <Compile Include="NzbDroneProcessService.cs" />
     <Compile Include="IUserAlert.cs" />
     <Compile Include="Owin\NlogTextWriter.cs" />
     <Compile Include="Owin\OwinServiceProvider.cs" />

src/NzbDrone.Host/NzbDroneProcessService.cs

@@ -0,0 +1,47 @@
+using System.Linq;
+using NLog;
+using NzbDrone.Common.Processes;
+
+namespace NzbDrone.Host
+{
+    public interface ISingleInstancePolicy
+    {
+        void EnforceSingleInstance();
+    }
+
+    public class SingleInstancePolicy : ISingleInstancePolicy
+    {
+        private readonly IProcessProvider _processProvider;
+        private readonly IBrowserService _browserService;
+        private readonly Logger _logger;
+
+        public SingleInstancePolicy(IProcessProvider processProvider, IBrowserService browserService, Logger logger)
+        {
+            _processProvider = processProvider;
+            _browserService = browserService;
+            _logger = logger;
+        }
+
+        public void EnforceSingleInstance()
+        {
+            if (IsAlreadyRunning())
+            {
+                _logger.Warn("Another instance of NzbDrone is already running.");
+                _browserService.LaunchWebUI();
+                throw new TerminateApplicationException("Another instance is already running");
+            }
+        }
+
+        private bool IsAlreadyRunning()
+        {
+            var currentId = _processProvider.GetCurrentProcess().Id;
+            var consoleIds = _processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME).Select(c => c.Id);
+            var guiIds = _processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_PROCESS_NAME).Select(c => c.Id);
+
+            var otherProcesses = consoleIds.Union(guiIds).Except(new[] { currentId });
+
+            return otherProcesses.Any();
+        }
+
+    }
+}

src/NzbDrone.Host/Owin/IHostController.cs

@@ -2,7 +2,6 @@
 {
     public interface IHostController
     {
-        string AppUrl { get; }
         void StartServer();
         void StopServer();
     }

src/NzbDrone.Host/Owin/OwinHostController.cs

@@ -107,11 +107,6 @@ private void BuildApp(IAppBuilder appBuilder)
             }
         }
 
-        public string AppUrl
-        {
-            get { return string.Format("http://localhost:{0}", _configFileProvider.Port); }
-        }
-
         public void StopServer()
         {
             if (_host == null) return;

src/NzbDrone.Host/TerminateApplicationException.cs

@@ -4,5 +4,11 @@ namespace NzbDrone.Host
 {
     public class TerminateApplicationException : ApplicationException
     {
+        public TerminateApplicationException(string reason)
+        {
+            Reason = reason;
+        }
+
+        public string Reason { get; private set; }
     }
 }

src/NzbDrone/SysTray/SysTrayApp.cs

@@ -2,7 +2,7 @@
 using System.ComponentModel;
 using System.Windows.Forms;
 using NzbDrone.Common.EnvironmentInfo;
-using NzbDrone.Common.Processes;
+using NzbDrone.Host;
 using NzbDrone.Host.Owin;
 
 namespace NzbDrone.SysTray
@@ -14,16 +14,14 @@ public interface ISystemTrayApp
 
     public class SystemTrayApp : Form, ISystemTrayApp
     {
-        private readonly IProcessProvider _processProvider;
-        private readonly IHostController _hostController;
+        private readonly IBrowserService _browserService;
 
         private readonly NotifyIcon _trayIcon = new NotifyIcon();
         private readonly ContextMenu _trayMenu = new ContextMenu();
 
-        public SystemTrayApp(IProcessProvider processProvider, IHostController hostController)
+        public SystemTrayApp(IBrowserService browserService)
         {
-            _processProvider = processProvider;
-            _hostController = hostController;
+            _browserService = browserService;
         }
 
 
@@ -84,7 +82,7 @@ private void LaunchBrowser(object sender, EventArgs e)
         {
             try
             {
-                _processProvider.OpenDefaultBrowser(_hostController.AppUrl);
+                _browserService.LaunchWebUI();
             }
             catch (Exception)
             {

src/NzbDrone/WindowsApp.cs

@@ -10,7 +10,7 @@ namespace NzbDrone
 {
     public static class WindowsApp
     {
-        private static readonly Logger Logger =  NzbDroneLogger.GetLogger();
+        private static readonly Logger Logger = NzbDroneLogger.GetLogger();
 
         public static void Main(string[] args)
         {
@@ -20,12 +20,18 @@ public static void Main(string[] args)
 
                 LogTargets.Register(startupArgs, false, true);
 
-                var container = Bootstrap.Start(startupArgs, new MessageBoxUserAlert());
-                container.Register<ISystemTrayApp, SystemTrayApp>();
-                container.Resolve<ISystemTrayApp>().Start();
+                var bootstrap = new Bootstrap(startupArgs, new MessageBoxUserAlert());
+
+                bootstrap.EnsureSingleInstance();
+
+                bootstrap.Start();
+                bootstrap.Container.Register<ISystemTrayApp, SystemTrayApp>();
+                bootstrap.Container.Resolve<ISystemTrayApp>().Start();
+
             }
-            catch (TerminateApplicationException)
+            catch (TerminateApplicationException e)
             {
+                Logger.Info("Application has been terminated. Reason " + e.Reason);
             }
             catch (Exception e)
             {
@@ -34,5 +40,7 @@ public static void Main(string[] args)
                 MessageBox.Show(text: message, buttons: MessageBoxButtons.OK, icon: MessageBoxIcon.Error, caption: "Epic Fail!");
             }
         }
+
+
     }
 }