public static async Task ReceiveDeltas(HotReloadAgent hotReloadAgent)
{
Log("Attempting to receive deltas.");
// This value is configured by dotnet-watch when the app is to be launched.
var namedPipeName = Environment.GetEnvironmentVariable("DOTNET_HOTRELOAD_NAMEDPIPE_NAME") ??
throw new InvalidOperationException("DOTNET_HOTRELOAD_NAMEDPIPE_NAME was not specified.");
using var pipeClient = new NamedPipeClientStream(".", namedPipeName, PipeDirection.InOut, PipeOptions.CurrentUserOnly | PipeOptions.Asynchronous);
try
{
await pipeClient.ConnectAsync(5000);
Log("Connected.");
}
catch (TimeoutException)
{
Log("Unable to connect to hot-reload server.");
return;
}
while (pipeClient.IsConnected)
{
var update = await UpdatePayload.ReadAsync(pipeClient, default);
Log("Attempting to apply deltas.");
hotReloadAgent.ApplyDeltas(update.Deltas);
pipeClient.WriteByte((byte)ApplyResult.Success);
}
Log("Stopped received delta updates. Server is no longer connected.");
}
public static async Task ReceiveDeltas()
{
Log("Attempting to receive deltas.");
using var pipeClient = new NamedPipeClientStream(".", "netcore-hot-reload", PipeDirection.InOut, PipeOptions.CurrentUserOnly | PipeOptions.Asynchronous);
try
{
await pipeClient.ConnectAsync(5000);
Log("Connected.");
}
catch (TimeoutException)
{
Log("Unable to connect to hot-reload server.");
return;
}
List <Action>?receiveDeltaNotifications = null;
while (pipeClient.IsConnected)
{
var update = await UpdatePayload.ReadAsync(pipeClient, default);
Log("Attempting to apply deltas.");
try
{
foreach (var item in update.Deltas)
{
var assembly = AppDomain.CurrentDomain.GetAssemblies().FirstOrDefault(a => a.Modules.FirstOrDefault() is Module m && m.ModuleVersionId == item.ModuleId);
if (assembly is not null)
{
System.Reflection.Metadata.AssemblyExtensions.ApplyUpdate(assembly, item.MetadataDelta, item.ILDelta, ReadOnlySpan <byte> .Empty);
}
}
// We want to base this off of mvids, but we'll figure that out eventually.
var applyResult = update.ChangedFile is string changedFile && changedFile.EndsWith(".razor", StringComparison.Ordinal) ?
ApplyResult.Success :
ApplyResult.Success_RefreshBrowser;
pipeClient.WriteByte((byte)applyResult);
// Defer discovering the receiving deltas until the first hot reload delta.
// This should give enough opportunity for AppDomain.GetAssemblies() to be sufficiently populated.
receiveDeltaNotifications ??= GetAssembliesReceivingDeltas();
receiveDeltaNotifications.ForEach(r => r.Invoke());
Log("Deltas applied.");
}
catch (Exception ex)
{
Log(ex.ToString());
}
}
Log("Stopped received delta updates. Server is no longer connected.");
}