public static async Task UseServiceRegistry(this IApplicationBuilder app, IHostApplicationLifetime lifetime,
ILogger logger, ServiceInstanceData data)
{
for (int attempt = 1; attempt <= Retries; ++attempt)
{
await Task.Delay(TimeSpan.FromSeconds((attempt - 1) * 5));
try
{
logger.LogInformation(
$"UseServiceRegistry (attempt {attempt}/{Retries}) called for {JsonConvert.SerializeObject(data)}");
if (!await RegisterServiceInstance(logger, data))
{
continue;
}
}
catch
{
logger.LogWarning($"UseServiceRegistry failed due to exception.");
continue;
}
lifetime.ApplicationStopping.Register(async() =>
{
var deregisterClient = new HttpClient();
await deregisterClient.DeleteAsync($"{ServiceRegistryAddress}/{data.InstanceId}");
});
return;
}
throw new Exception($"Service registration failed after {Retries} attempts");
}
private static async Task <bool> RegisterServiceInstance(ILogger logger, ServiceInstanceData data)
{
var registerClient = new HttpClient {
Timeout = TimeSpan.FromSeconds(2)
};
var response = await registerClient.PostAsync(ServiceRegistryAddress,
new StringContent(JsonConvert.SerializeObject(data), Encoding.UTF8, "application/json"));
if (response == null || (int)response.StatusCode < 200 || (int)response.StatusCode > 299)
{
logger.LogWarning($"UseServiceRegistry failed. Response {JsonConvert.SerializeObject(response)}");
return(false);
}
logger.LogInformation("UseServiceRegistry succeeded.");
return(true);
}
