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在C#中,中間件和微服務(wù)注冊(cè)中心的交互通常是通過(guò)使用一些開(kāi)源框架和庫(kù)來(lái)實(shí)現(xiàn)的。這里我們以.NET Core中間件和Consul作為微服務(wù)注冊(cè)中心為例進(jìn)行說(shuō)明。
dotnet add package Consul
public class ConsulConfig
{
public string Address { get; set; }
public string ServiceName { get; set; }
public string ServiceID { get; set; }
public int ServicePort { get; set; }
}
"ConsulConfig": {
"Address": "http://localhost:8500",
"ServiceName": "your_service_name",
"ServiceID": "your_service_id",
"ServicePort": 80
}
public void ConfigureServices(IServiceCollection services)
{
// ...
services.Configure<ConsulConfig>(Configuration.GetSection("ConsulConfig"));
services.AddSingleton<IConsulClient, ConsulClient>(p => new ConsulClient(consulConfig =>
{
var address = Configuration["ConsulConfig:Address"];
consulConfig.Address = new Uri(address);
}));
}
public class ConsulRegisterMiddleware
{
private readonly IConsulClient _consulClient;
private readonly IOptions<ConsulConfig> _consulConfig;
private readonly IHostApplicationLifetime _lifetime;
public ConsulRegisterMiddleware(IConsulClient consulClient, IOptions<ConsulConfig> consulConfig, IHostApplicationLifetime lifetime)
{
_consulClient = consulClient;
_consulConfig = consulConfig;
_lifetime = lifetime;
}
public async Task RegisterAsync()
{
var registration = new AgentServiceRegistration
{
ID = _consulConfig.Value.ServiceID,
Name = _consulConfig.Value.ServiceName,
Address = Dns.GetHostName(),
Port = _consulConfig.Value.ServicePort,
Check = new AgentServiceCheck
{
HTTP = $"http://{Dns.GetHostName()}:{_consulConfig.Value.ServicePort}/health",
Interval = TimeSpan.FromSeconds(10),
DeregisterCriticalServiceAfter = TimeSpan.FromSeconds(60)
}
};
await _consulClient.Agent.ServiceRegister(registration);
_lifetime.ApplicationStopping.Register(async () =>
{
await _consulClient.Agent.ServiceDeregister(_consulConfig.Value.ServiceID);
});
}
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IHostApplicationLifetime lifetime)
{
// ...
var consulRegisterMiddleware = app.ApplicationServices.GetRequiredService<ConsulRegisterMiddleware>();
consulRegisterMiddleware.RegisterAsync().Wait();
}
現(xiàn)在,當(dāng)你的服務(wù)啟動(dòng)時(shí),它會(huì)自動(dòng)將自己注冊(cè)到Consul。當(dāng)服務(wù)關(guān)閉時(shí),它會(huì)自動(dòng)從Consul注銷。這樣,其他服務(wù)就可以通過(guò)Consul發(fā)現(xiàn)和調(diào)用你的服務(wù)了。
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