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;
}
var initPayload = new ClientInitializationPayload {
Capabilities = GetApplyUpdateCapabilities()
};
Log("Writing capabilities: " + initPayload.Capabilities);
initPayload.Write(pipeClient);
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 ValueTask InitializeAsync(DotNetWatchContext context, CancellationToken cancellationToken)
{
if (!SuppressNamedPipeForTests)
{
_pipe = new NamedPipeServerStream(_namedPipeName, PipeDirection.InOut, 1, PipeTransmissionMode.Byte, PipeOptions.Asynchronous | PipeOptions.CurrentUserOnly);
_connectionTask = _pipe.WaitForConnectionAsync(cancellationToken);
_capabilities = Task.Run(async() =>
{
try
{
await _connectionTask;
// When the client connects, the first payload it sends is the initialization payload which includes the apply capabilities.
var capabiltiies = ClientInitializationPayload.Read(_pipe).Capabilities;
_reporter.Verbose($"Application supports the following capabilities {capabiltiies}.");
return(capabiltiies.Split(' ').ToImmutableArray());
}
catch
{
// Do nothing. This is awaited by Apply which will surface the error.
}
return(ImmutableArray <string> .Empty);
});
}
if (context.Iteration == 0)
{
var deltaApplier = Path.Combine(AppContext.BaseDirectory, "hotreload", "Microsoft.Extensions.DotNetDeltaApplier.dll");
context.ProcessSpec.EnvironmentVariables.DotNetStartupHooks.Add(deltaApplier);
// Configure the app for EnC
context.ProcessSpec.EnvironmentVariables["DOTNET_MODIFIABLE_ASSEMBLIES"] = "debug";
context.ProcessSpec.EnvironmentVariables["DOTNET_HOTRELOAD_NAMEDPIPE_NAME"] = _namedPipeName;
}
return(default);