public GreeterImpl(string instanceName, GreetingFederator federator)
{
this.instanceName = instanceName;
this.federator = federator;
}
public static void Main(string[] args)
{
int port;
if (!int.TryParse(Environment.GetEnvironmentVariable("GREETINGS_PORT"), out port))
{
port = DefaultPort;
}
var instanceName = Environment.GetEnvironmentVariable("GREETINGS_NAME") ?? Environment.MachineName;
var downStreamHosts = Environment.GetEnvironmentVariable("GREETINGS_DOWNSTREAM_HOSTS") ?? string.Empty;
int helloDelay;
if (!int.TryParse(Environment.GetEnvironmentVariable("GREETINGS_DELAYMS"), out helloDelay))
{
helloDelay = 0;
}
var federator = new GreetingFederator(downStreamHosts, instanceName);
Server server = new Server
{
Services = { Greeter.BindService(new GreeterImpl(instanceName, federator)) },
Ports = { new ServerPort("0.0.0.0", port, ServerCredentials.Insecure) }
};
server.Start();
Console.WriteLine($"Greeter server [{instanceName}] listening on port [{port}]");
var cts = new CancellationTokenSource();
if (helloDelay != 0)
{
int numBytes;
string payload = string.Empty;
if (int.TryParse(Environment.GetEnvironmentVariable("GREETINGS_NUMBYTES"), out numBytes))
{
if (numBytes > 0)
{
payload = new string('*', numBytes);
}
}
Console.WriteLine($"Greeter server [{instanceName}] will federate as client");
Task.Run(() => {
while (!cts.IsCancellationRequested)
{
federator.SayHello(new HelloRequest {
Name = payload
});
if (helloDelay > 0)
{
Task.Delay(helloDelay, cts.Token);
}
}
}, cts.Token);
}
var syncTask = new TaskCompletionSource <bool>();
System.Runtime.Loader.AssemblyLoadContext.Default.Unloading += (context) => {
Console.WriteLine("Greeter server received kill signal...");
cts.Cancel();
server.ShutdownAsync().Wait();
syncTask.SetResult(true);
};
syncTask.Task.Wait(-1);
Console.WriteLine("Greeter server stopped");
}