public Task StartAsync(CancellationToken stoppingToken)
{
_logger.Info("Starting background services...");
SendTransaction(null);
_timer = new Timer(SendTransaction, null, TimeSpan.Zero, TimeSpan.FromMinutes(60));
return(Task.CompletedTask);
}
private void Connect()
{
_logger.Info("Attempting initial connection to RabbitMQ...");
var connectionRetries = 0;
var connected = ConnectToQueue();
if (!connected)
{
_logger.Info($"Initial connection to RabbitMQ failed. Beginning retries [MAX = {_queueConnectionSettings.Value.MaxConnectionRetries}]...");
}
while (CanRetry(connected, connectionRetries))
{
connectionRetries++;
_logger.Info($"Attempting {connectionRetries} connection to RabbitMQ...");
connected = ConnectToQueue();
if (CanRetry(connected, connectionRetries))
{
_logger.Info($"Connection attempt {connectionRetries} to RabbitMQ failed. Will retry in {_queueConnectionSettings.Value.ConnectionRetryWaitSeconds} seconds...");
var task = Task.Delay(new TimeSpan(0, 0, 0, _queueConnectionSettings.Value.ConnectionRetryWaitSeconds));
task.Wait();
}
else
{
_logger.Info($"Connection attempt {connectionRetries} to RabbitMQ failed. Max retries of {_queueConnectionSettings.Value.MaxConnectionRetries} reached. Will not retry.");
}
}
if (!connected)
{
_logger.Info("Application could not successfully connected to RabbitMQ.");
throw new Exception("Unable to connect to RabbitMQ");
}
_logger.Info("Application has successfully connected to RabbitMQ.");
}
public T InvokeApi <T>(string url, ApiRequestData data, IApiLogger logger)
{
string value = "";
try
{
var request = (HttpWebRequest)WebRequest.Create(url);
request.Credentials = CredentialCache.DefaultCredentials;
request.Timeout = data.requestTimeout;
// headers
if (data.acceptHeader != null)
{
request.Accept = data.acceptHeader;
}
foreach (KeyValuePair <string, string> header in data.headers)
{
request.Headers.Add(header.Key, header.Value);
}
request.Method = data.method.ToString();
//處理POST資料
if (data.method == ApiRequestData.Method.POST ||
data.method == ApiRequestData.Method.PUT)
{
var paramBytes = Encoding.UTF8.GetBytes(data.postData);
request.ContentType = data.contentTypeText;
request.ContentLength = paramBytes.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(paramBytes, 0, paramBytes.Length);
}
}
logger.Info($"{url} req: {data.postData}");
using (var response = (HttpWebResponse)request.GetResponse())
{
//HttpStatusCode=200才算呼叫成功
if (response.StatusCode == HttpStatusCode.OK)
{
using (var sr = new StreamReader(response.GetResponseStream()))
{
value = sr.ReadToEnd();
}
}
else
{
throw new Exception(((int)response.StatusCode).ToString() + ":" + response.StatusDescription);
}
}
}
catch (Exception ex)
{
logger.Error($"invokeApi {ex.ToString()}");
}
logger.Info($"{url} resp: {value}");
return(JsonConvert.DeserializeObject <T>(value));
}
