Always pass through Process Id to subprocess

Improve command line parsing

Partial import of changes from #2375

Author: amaitland

CefSharp.BrowserSubprocess.Core/WcfEnabledSubProcess.cpp

@@ -14,19 +14,20 @@ namespace CefSharp
     {
         void WcfEnabledSubProcess::OnBrowserCreated(CefBrowserWrapper^ browser)
         {
-            if (!parentBrowserId.HasValue)
+            if (!_parentBrowserId.HasValue)
             {
-                parentBrowserId = browser->BrowserId;
+                _parentBrowserId = browser->BrowserId;
             }
 
-            if (!parentProcessId.HasValue || !parentBrowserId.HasValue)
+            if (!_parentBrowserId.HasValue)
             {
                 return;
             }
 
-            auto browserId = browser->IsPopup ? parentBrowserId.Value : browser->BrowserId;
+            //TODO: This can likely be simplified as both values are likely equal
+            auto browserId = browser->IsPopup ? _parentBrowserId.Value : browser->BrowserId;
 
-            auto serviceName = RenderprocessClientFactory::GetServiceName(parentProcessId.Value, browserId);
+            auto serviceName = RenderprocessClientFactory::GetServiceName(_parentProcessId, browserId);
 
             auto binding = BrowserProcessServiceHost::CreateBinding();
 

CefSharp.BrowserSubprocess.Core/WcfEnabledSubProcess.h

@@ -17,22 +17,21 @@ namespace CefSharp
         public ref class WcfEnabledSubProcess : SubProcess
         {
         private:
-            Nullable<int> parentBrowserId;
+            Nullable<int> _parentBrowserId;
 
             /// <summary>
             /// The PID for the parent (browser) process
             /// </summary>
-            Nullable<int> parentProcessId;
+            int _parentProcessId;
 
         public:
-            WcfEnabledSubProcess(IEnumerable<String^>^ args) : SubProcess(args)
+            WcfEnabledSubProcess(int parentProcessId, IEnumerable<String^>^ args) : SubProcess(args)
             {
-                parentProcessId = CommandLineArgsParser::LocateParentProcessId(args);
+                _parentProcessId = parentProcessId;
             }
 
             void OnBrowserCreated(CefBrowserWrapper^ browser) override;
             void OnBrowserDestroyed(CefBrowserWrapper^ browser) override;
-
         };
     }
 }

CefSharp.BrowserSubprocess/Program.cs

@@ -3,9 +3,7 @@
 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
 
 using System;
-using System.Collections.Generic;
 using System.Diagnostics;
-using System.Linq;
 using CefSharp.Internals;
 
 namespace CefSharp.BrowserSubprocess
@@ -19,16 +17,14 @@ public static int Main(string[] args)
             SubProcess.EnableHighDPISupport();
 
             int result;
-
-            const string typePrefix = "--type=";
-            var typeArgument = args.SingleOrDefault(arg => arg.StartsWith(typePrefix));
-            var type = typeArgument.Substring(typePrefix.Length);
+            var type = args.GetArgumentValue(CefSharpArguments.SubProcessTypeArgument);
+            var parentProcessId = int.Parse(args.GetArgumentValue(CefSharpArguments.HostProcessIdArgument));
 
             //Use our custom subProcess provides features like EvaluateJavascript
             if (type == "renderer")
             {
                 var wcfEnabled = args.HasArgument(CefSharpArguments.WcfEnabledArgument);
-                var subProcess = wcfEnabled ? new WcfEnabledSubProcess(args) : new SubProcess(args);
+                var subProcess = wcfEnabled ? new WcfEnabledSubProcess(parentProcessId, args) : new SubProcess(args);
 
                 using (subProcess)
                 {

CefSharp.Core/Internals/CefSharpApp.h

@@ -58,11 +58,12 @@ namespace CefSharp
             if (CefSharpSettings::WcfEnabled)
             {
                 commandLine->AppendArgument(StringUtils::ToNative(CefSharpArguments::WcfEnabledArgument));
-                //ChannelId was removed in https://bitbucket.org/chromiumembedded/cef/issues/1912/notreached-in-logchannelidandcookiestores
-                //We need to know the process Id to establish WCF communication
-                commandLine->AppendArgument(StringUtils::ToNative(CefSharpArguments::WcfHostProcessIdArgument + "=" + Process::GetCurrentProcess()->Id));
             }
 
+            //ChannelId was removed in https://bitbucket.org/chromiumembedded/cef/issues/1912/notreached-in-logchannelidandcookiestores
+            //We need to know the process Id to establish WCF communication and for monitoring of parent process exit
+            commandLine->AppendArgument(StringUtils::ToNative(CefSharpArguments::HostProcessIdArgument + "=" + Process::GetCurrentProcess()->Id));
+
             if (_cefSettings->_cefCustomSchemes->Count > 0)
             {
                 String^ argument = "=";

CefSharp/Internals/CefSharpArguments.cs

@@ -7,8 +7,9 @@ namespace CefSharp.Internals
     public static class CefSharpArguments
     {
         public const string WcfEnabledArgument = "--wcf-enabled";
-        public const string WcfHostProcessIdArgument = "--wcf-host-process-id";
+        public const string HostProcessIdArgument = "--host-process-id";
         public const string CustomSchemeArgument = "--custom-scheme";
         public const string FocusedNodeChangedEnabledArgument = "--focused-node-enabled";
+        public const string SubProcessTypeArgument = "--type";
     }
 }

CefSharp/Internals/CommandLineArgsParser.cs

@@ -17,18 +17,15 @@ public static bool HasArgument(this IEnumerable<string> args, string arg)
             return args.Any(a => a.StartsWith(arg));
         }
 
-        public static int? LocateParentProcessId(this IEnumerable<string> args)
+        public static string GetArgumentValue(this IEnumerable<string> args, string argumentName)
         {
-            var hostProcessId = args.SingleOrDefault(arg => arg.StartsWith(CefSharpArguments.WcfHostProcessIdArgument));
-            if (hostProcessId == null)
+            var arg = args.FirstOrDefault(a => a.StartsWith(argumentName));
+            if (arg == null)
             {
                 return null;
             }
 
-            var parentProcessId = hostProcessId
-                .Split('=')
-                .Last();
-            return int.Parse(parentProcessId);
+            return arg.Split('=').Last();
         }
     }
 }