public ChannelReader <string> WeatherStream(CancellationToken cancellationToken)
{
var channel = Channel.CreateUnbounded <string>();
_ = WriteItemsAsync(channel.Writer);
return(channel.Reader);
async Task WriteItemsAsync(ChannelWriter <string> writer)
{
using var replies = _client.GetWeatherStream(new WeatherRequest(), cancellationToken: cancellationToken);
try
{
await foreach (var forecast in replies.ResponseStream.ReadAllAsync())
{
var date = DateTimeOffset.FromUnixTimeSeconds(forecast.DateTimeStamp);
await writer.WriteAsync($"{date:s} | {forecast.Summary} | {forecast.TemperatureC} C", cancellationToken);
}
}
catch (RpcException ex) when(ex.StatusCode == StatusCode.Cancelled)
{
replies.Dispose();
Console.WriteLine("Stream cancelled.");
}
catch (Exception ex)
{
writer.TryComplete(ex);
}
writer.TryComplete();
}
}
private static async Task Main(string[] args)
{
var channel = GrpcChannel.ForAddress("https://localhost:5005");
var client = new WeatherForecasts.WeatherForecastsClient(channel);
var cts = new CancellationTokenSource();
cts.CancelAfter(TimeSpan.FromSeconds(5));
using var replies = client.GetWeatherStream(new WeatherRequest(), cancellationToken: cts.Token);
try
{
await foreach (var weatherData in replies.ResponseStream.ReadAllAsync(cancellationToken: cts.Token))
{
var date = DateTimeOffset.FromUnixTimeSeconds(weatherData.DateTimeStamp);
Console.WriteLine($"{date:s} | {weatherData.Summary} | {weatherData.TemperatureC} C");
}
while (await replies.ResponseStream.MoveNext(cts.Token))
{
}
}
catch (RpcException ex) when(ex.StatusCode == StatusCode.Cancelled)
{
replies.Dispose();
Console.WriteLine("Stream cancelled.");
}
Console.WriteLine("Press a key to exit");
Console.ReadKey();
}
static async Task Main(string[] args)
{
var channel = GrpcChannel.ForAddress("https://localhost:5001");
var client = new WeatherForecasts.WeatherForecastsClient(channel);
var dataStream = client.GetWeatherStream(new Empty());
var cancellationToken = new CancellationTokenSource(TimeSpan.FromSeconds(10)).Token;
try
{
await foreach (var weatherData in dataStream.ResponseStream.ReadAllAsync(cancellationToken))
{
Console.WriteLine(weatherData.DateTimeStamp + ": " + weatherData.DegreesCelsius + "C, humidity "
+ weatherData.Humidity + "%");
}
}
catch (RpcException e) when(e.StatusCode == StatusCode.Cancelled)
{
Console.WriteLine("Stream cancelled by client.");
}
}