[dotnet-watch] Make pipe reads and writes fully async

src/BuiltInTools/DotNetDeltaApplier/StartupHook.cs

@@ -59,7 +59,7 @@ public static void Initialize()
                 agent.Reporter.Report("Writing capabilities: " + agent.Capabilities, AgentMessageSeverity.Verbose);
 
                 var initPayload = new ClientInitializationPayload(agent.Capabilities);
-                initPayload.Write(pipeClient);
+                await initPayload.WriteAsync(pipeClient, CancellationToken.None);
 
                 while (pipeClient.IsConnected)
                 {
@@ -71,8 +71,8 @@ public static void Initialize()
                     var logEntries = agent.GetAndClearLogEntries(update.ResponseLoggingLevel);
 
                     // response:
-                    pipeClient.WriteByte(UpdatePayload.ApplySuccessValue);
-                    UpdatePayload.WriteLog(pipeClient, logEntries);
+                    await pipeClient.WriteAsync((byte)UpdatePayload.ApplySuccessValue, CancellationToken.None);
+                    await UpdatePayload.WriteLogAsync(pipeClient, logEntries, CancellationToken.None);
                 }
             }
             catch (Exception ex)

src/BuiltInTools/HotReloadAgent/AgentMessageSeverity.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+namespace Microsoft.DotNet.HotReload;
 
 internal enum AgentMessageSeverity : byte
 {

src/BuiltInTools/HotReloadAgent/Microsoft.DotNet.HotReload.Agent.Package.csproj

@@ -1,7 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <!-- This source package is used by Visual Studio WebTools -->
-    <TargetFramework>$(VisualStudioServiceTargetFramework)</TargetFramework>
+    <!--
+      Intentionally pinned. This feature is supported in projects targeting 6.0 or newer.
+      At the same time source build requires us to not target 6.0, so we fall back to netstandard.
+    -->
+    <TargetFramework>netstandard2.1</TargetFramework>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <DebugType>none</DebugType>
     <GenerateDependencyFile>false</GenerateDependencyFile>
@@ -19,9 +22,6 @@
     <!-- Remove once https://github.com/NuGet/Home/issues/8583 is fixed -->
     <NoWarn>$(NoWarn);NU5128</NoWarn>
   </PropertyGroup>
-  <ItemGroup>
-    <FrameworkReference Include="Microsoft.AspNetCore.App" />
-  </ItemGroup>
 
   <!-- Make sure the shared source files do not require any global usings -->
   <ItemGroup>

src/BuiltInTools/dotnet-watch/HotReload/BlazorWebAssemblyDeltaApplier.cs

@@ -119,7 +119,10 @@ await browserRefreshServer.SendAndReceiveAsync(
                         anyFailure = true;
                     }
 
-                    ReportLog(reporter, data.Log.Select(entry => (entry.Message, (AgentMessageSeverity)entry.Severity)));
+                    foreach (var entry in data.Log)
+                    {
+                        ReportLogEntry(reporter, entry.Message, (AgentMessageSeverity)entry.Severity);
+                    }
                 },
                 cancellationToken);
 

src/BuiltInTools/dotnet-watch/HotReload/DefaultDeltaApplier.cs

@@ -36,9 +36,9 @@ async Task<ImmutableArray<string>> ConnectAsync()
 
                     // When the client connects, the first payload it sends is the initialization payload which includes the apply capabilities.
 
-                    var capabilities = ClientInitializationPayload.Read(_pipe).Capabilities;
+                    var capabilities = (await ClientInitializationPayload.ReadAsync(_pipe, cancellationToken)).Capabilities;
                     Reporter.Verbose($"Capabilities: '{capabilities}'");
-                    return capabilities.Split(' ').ToImmutableArray();
+                    return [.. capabilities.Split(' ')];
                 }
                 catch (EndOfStreamException)
                 {
@@ -149,7 +149,11 @@ private async Task<bool> ReceiveApplyUpdateResult(CancellationToken cancellation
                     return false;
                 }
 
-                ReportLog(Reporter, UpdatePayload.ReadLog(_pipe));
+                await foreach (var (message, severity) in UpdatePayload.ReadLogAsync(_pipe, cancellationToken))
+                {
+                    ReportLogEntry(Reporter, message, severity);
+                }
+
                 return true;
             }
             finally

src/BuiltInTools/dotnet-watch/HotReload/DeltaApplier.cs

@@ -28,24 +28,21 @@ internal abstract class DeltaApplier(IReporter reporter) : IDisposable
 
         public abstract void Dispose();
 
-        public static void ReportLog(IReporter reporter, IEnumerable<(string message, AgentMessageSeverity severity)> log)
+        public static void ReportLogEntry(IReporter reporter, string message, AgentMessageSeverity severity)
         {
-            foreach (var (message, severity) in log)
+            switch (severity)
             {
-                switch (severity)
-                {
-                    case AgentMessageSeverity.Error:
-                        reporter.Error(message);
-                        break;
-
-                    case AgentMessageSeverity.Warning:
-                        reporter.Warn(message, emoji: "⚠");
-                        break;
-
-                    default:
-                        reporter.Verbose(message, emoji: "🕵️");
-                        break;
-                }
+                case AgentMessageSeverity.Error:
+                    reporter.Error(message);
+                    break;
+
+                case AgentMessageSeverity.Warning:
+                    reporter.Warn(message, emoji: "⚠");
+                    break;
+
+                default:
+                    reporter.Verbose(message, emoji: "🕵️");
+                    break;
             }
         }
     }