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using NATS.Client.Core;
using NATS.Client.JetStream;
using NATS.Client.JetStream.Models;
using Nats.Common;
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.AddServiceDefaults();
builder.AddNatsClient("nats", configureOptions: opts =>
{
var jsonRegistry = new NatsJsonContextSerializerRegistry(AppJsonContext.Default);
return opts with { SerializerRegistry = jsonRegistry };
});
builder.AddNatsJetStream();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
app.MapDefaultEndpoints();
app.MapGet("/ping", async (INatsConnection nats) =>
{
var rtt = await nats.PingAsync();
return Results.Json(new { rtt, nats.ServerInfo });
});
app.MapPost("/stream", async (StreamConfig config, INatsJSContext jetStream) =>
{
var stream = await jetStream.CreateStreamAsync(config);
var name = stream.Info.Config.Name;
return Results.Created($"/stream/{name}", name);
});
app.MapGet("/stream/{name}", async (string name, INatsJSContext jetStream) =>
{
var stream = await jetStream.GetStreamAsync(name);
return Results.Ok(stream.Info);
});
app.MapPost("/publish/", async (AppEvent @event, INatsJSContext jetStream) =>
{
try
{
var ack = await jetStream.PublishAsync(@event.Subject, @event);
ack.EnsureSuccess();
}
catch (NatsJSPublishNoResponseException)
{
return Results.Problem("Make sure the stream is created before publishing.");
}
return Results.Created();
});
app.MapGet("/consume/{name}", async (string name, INatsJSContext jetStream) =>
{
var stream = await jetStream.GetStreamAsync(name);
var consumer = await stream.CreateOrderedConsumerAsync();
var events = new List<AppEvent>();
await foreach(var msg in consumer.ConsumeAsync<AppEvent>())
{
events.Add(msg.Data!);
if (msg.Metadata?.NumPending == 0)
{
break;
}
}
return Results.Ok(events);
});
app.Run();
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