private static async Task PerformHandshakeAsync(IPC ipc)
{
// Do a two-way handshake with the browser, this ensures that the appropriate
// interop handlers have been set up before control returns to the user.
//
// The handshake sequence looks like this:
//
// 1. dotnet starts listening for components:init
// 2. dotnet sends components:init repeatedly
// 3. JS starts listening for components:init
// 4. JS sends a components:init once it has received one from dotnet - it's ready
// 5. dotnet receives components:init - it's ready
//
// Because either side might take any amount of time to start listening,
// step 3 can occur at any point prior to step 4. The whole process works
// because steps 1, 2, 4, and 5 can only occur in that order
var cts = new CancellationTokenSource();
var incomingHandshakeCancellationToken = cts.Token;
ipc.Once("components:init", args =>
{
var argsArray = (object[])args;
InitialUriAbsolute = ((JsonElement)argsArray[0]).GetString();
BaseUriAbsolute = ((JsonElement)argsArray[1]).GetString();
cts.Cancel();
});
Log("Waiting for interop connection");
while (!incomingHandshakeCancellationToken.IsCancellationRequested)
{
ipc.Send("components:init");
try
{
await Task.Delay(100, incomingHandshakeCancellationToken);
}
catch (TaskCanceledException)
{
}
}
Log("Interop connected");
}
protected override void BeginInvokeJS(long asyncHandle, string identifier, string argsJson)
{
_ipc.Send("JS.BeginInvokeJS", asyncHandle, identifier, argsJson);
}