I use AddHttpClient() dependency injection to add a named client to a transient service. At times, when I execute netstat -a on the server, I see many connections open with TIME_WAIT or CLOSE_WAIT status. I believe that these connections take up so much resource that, other TCP connections are unable to operate. Is this possible? Is there a way to stop these, and is it safe?
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
ServicePointManager.DefaultConnectionLimit = 200;
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddHttpClient(FirebaseService.FirebaseServiceClient, ConfigureFirebaseClient);
services.AddTransient<FirebaseService>();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseMvc();
}
void ConfigureFirebaseClient(HttpClient client)
{
var scopes = new string[] { "https://www.googleapis.com/auth/firebase.messaging" };
Stream certificateStream = File.OpenRead("firebase-adminsdk.json");
var serviceCredentials = GoogleCredential.FromStream(certificateStream);
certificateStream.Close();
var scopedCredentials = serviceCredentials.CreateScoped(scopes);
var token = scopedCredentials.UnderlyingCredential.GetAccessTokenForRequestAsync().GetAwaiter().GetResult();
client.SetBearerToken(token);
}
}
public class FirebaseService
{
public static string FirebaseServiceClient = "FirebaseServiceClient";
private HttpClient _client;
private readonly ILogger<FirebaseService> _logger;
private readonly string _messagingUrl;
public FirebaseService(
ILogger<FirebaseService> logger,
IHttpClientFactory clientFactory)
{
_logger = logger;
_messagingUrl = "https://fcm.googleapis.com/v1/projects/test2/messages:send";
_client = clientFactory.CreateClient(FirebaseServiceClient);
}
public async Task<string> PostToFirebase(Dictionary<string, string> payload)
{
HttpResponseMessage result = null;
string cont = null;
try
{
var content = JsonConvert.SerializeObject(payload, Formatting.None);
var stringContent = new StringContent(content, Encoding.UTF8, "application/json");
result = await _client.PostAsync(_messagingUrl, stringContent);
cont = await result.Content.ReadAsStringAsync();
return cont;
}
finally
{
result?.Dispose();
}
}
}
public class ValuesController : ControllerBase
{
private readonly IServiceProvider _serviceProvider;
public ValuesController(IServiceProvider serviceProvider)
{
_serviceProvider = serviceProvider;
}
[HttpGet]
public async Task<IActionResult> Get()
{
var payload = new Dictionary<string, string>();
List<Task> tasks = new List<Task>();
for (int i = 0; i < 100; i++)
{
FirebaseService firebaseService = (FirebaseService)_serviceProvider.GetService(typeof(FirebaseService));
var task = firebaseService.PostToFirebase(payload);
tasks.Add(task);
Console.WriteLine(i);
}
await Task.WhenAll(tasks.ToArray());
//Console.WriteLine(result);
return Ok();
}
}
