Use dynamic port by default

Author: FlorianRappl

src/ElectronNET.AspNet/API/WebHostBuilderExtensions.cs

@@ -68,15 +68,14 @@ public static IWebHostBuilder UseElectron(this IWebHostBuilder builder, string[]
             // work as expected, see issue #952
             Environment.SetEnvironmentVariable("ELECTRON_RUN_AS_NODE", null);
 
-            var webPort = PortHelper.GetFreePort(ElectronNetRuntime.AspNetWebPort ?? ElectronNetRuntime.DefaultWebPort);
-            ElectronNetRuntime.AspNetWebPort = webPort;
+            var webPort = ElectronNetRuntime.AspNetWebPort ?? 0;
 
             // check for the content folder if its exists in base director otherwise no need to include
             // It was used before because we are publishing the project which copies everything to bin folder and contentroot wwwroot was folder there.
             // now we have implemented the live reload if app is run using /watch then we need to use the default project path.
 
             // For port 0 (dynamic port assignment), Kestrel requires binding to specific IP (127.0.0.1) not localhost
-            var host = "localhost";
+            var host = webPort == 0? "127.0.0.1" : "localhost";
 
             if (Directory.Exists($"{AppDomain.CurrentDomain.BaseDirectory}\\wwwroot"))
             {

src/ElectronNET.AspNet/Runtime/Controllers/RuntimeControllerAspNetBase.cs

@@ -1,7 +1,11 @@
 namespace ElectronNET.AspNet.Runtime
 {
     using System;
+    using System.Linq;
     using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Hosting.Server;
+    using Microsoft.AspNetCore.Hosting.Server.Features;
+    using Microsoft.Extensions.DependencyInjection;
     using ElectronNET.API;
     using ElectronNET.API.Bridge;
     using ElectronNET.Common;
@@ -11,11 +15,13 @@
 
     internal abstract class RuntimeControllerAspNetBase : RuntimeControllerBase
     {
+        private readonly IServer server;
         private readonly AspNetLifetimeAdapter aspNetLifetimeAdapter;
         private SocketBridgeService socketBridge;
 
-        protected RuntimeControllerAspNetBase(AspNetLifetimeAdapter aspNetLifetimeAdapter)
+        protected RuntimeControllerAspNetBase(IServer server, AspNetLifetimeAdapter aspNetLifetimeAdapter)
         {
+            this.server = server;
             this.aspNetLifetimeAdapter = aspNetLifetimeAdapter;
             this.aspNetLifetimeAdapter.Ready += this.AspNetLifetimeAdapter_Ready;
             this.aspNetLifetimeAdapter.Stopping += this.AspNetLifetimeAdapter_Stopping;
@@ -53,6 +59,12 @@ protected void HandleReady()
                 this.ElectronProcess.IsReady() &&
                 this.aspNetLifetimeAdapter.IsReady())
             {
+                var serverAddressesFeature = this.server.Features.Get<IServerAddressesFeature>();
+                var address = serverAddressesFeature.Addresses.First();
+                var uri = new Uri(address);
+
+                ElectronNetRuntime.AspNetWebPort = uri.Port;
+
                 this.TransitionState(LifetimeState.Ready);
                 Task.Run(this.RunReadyCallback);
             }

src/ElectronNET.AspNet/Runtime/Controllers/RuntimeControllerAspNetDotnetFirst.cs

@@ -2,6 +2,7 @@
 {
     using System;
     using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Hosting.Server;
     using ElectronNET.AspNet.Services;
     using ElectronNET.Common;
     using ElectronNET.Runtime.Data;
@@ -13,7 +14,7 @@ internal class RuntimeControllerAspNetDotnetFirst : RuntimeControllerAspNetBase
         private ElectronProcessBase electronProcess;
         private readonly string authorization;
 
-        public RuntimeControllerAspNetDotnetFirst(AspNetLifetimeAdapter aspNetLifetimeAdapter, IElectronAuthenticationService authenticationService = null) : base(aspNetLifetimeAdapter)
+        public RuntimeControllerAspNetDotnetFirst(IServer server, AspNetLifetimeAdapter aspNetLifetimeAdapter, IElectronAuthenticationService authenticationService = null) : base(server, aspNetLifetimeAdapter)
         {
             this.authorization = Guid.NewGuid().ToString("N"); // 32 hex chars, no hyphens
 

src/ElectronNET.AspNet/Runtime/Controllers/RuntimeControllerAspNetElectronFirst.cs

@@ -2,6 +2,7 @@
 {
     using System;
     using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Hosting.Server;
     using ElectronNET.Runtime.Data;
     using ElectronNET.Runtime.Services.ElectronProcess;
 
@@ -10,7 +11,7 @@ internal class RuntimeControllerAspNetElectronFirst : RuntimeControllerAspNetBas
         private ElectronProcessBase electronProcess;
         private int? port;
 
-        public RuntimeControllerAspNetElectronFirst(AspNetLifetimeAdapter aspNetLifetimeAdapter) : base(aspNetLifetimeAdapter)
+        public RuntimeControllerAspNetElectronFirst(IServer server, AspNetLifetimeAdapter aspNetLifetimeAdapter) : base(server, aspNetLifetimeAdapter)
         {
         }