private async Task <bool> IsReachable(IEndPointHandle endpoint)
{
try
{
var config = GetConfig();
var uri = BuildUri(endpoint, config);
var response = await GetHttpClient(config).GetAsync(uri, HttpCompletionOption.ResponseContentRead).ConfigureAwait(false);
return(response.Headers.Contains(GigyaHttpHeaders.ServerHostname));
}
catch
{
return(false);
}
}
private string BuildUri(IEndPointHandle endpoint, ServiceDiscoveryConfig config)
{
var useHttps = config.UseHttpsOverride ?? UseHttpsDefault;
var urlTemplate = useHttps ? "https://{0}:{1}/" : "http://{0}:{1}/";
var port = endpoint.Port ?? DefaultPort ?? config.DefaultPort;
if (port == null)
{
throw new ConfigurationException("Cannot access service. Service Port not configured. See tags to find missing configuration", unencrypted: new Tags
{
{ "ServiceName", ServiceName },
{ "Required configuration key", $"Discovery.{ServiceName}.DefaultPort" }
});
}
return(string.Format(urlTemplate, endpoint.HostName, port));
}
private async Task <bool> IsReachable(IEndPointHandle endpoint)
{
try
{
var config = GetConfig();
var port = GetEffectivePort(endpoint, config);
if (port == null)
{
return(false);
}
var uri = BuildUri(endpoint.HostName, port.Value, config);
var response = await GetHttpClient(config).GetAsync(uri, HttpCompletionOption.ResponseContentRead).ConfigureAwait(false);
return(response.Headers.Contains(HSHttpHeaders.ServerHostname));
}
catch
{
return(false);
}
}
private async Task <object> InvokeCore(HttpServiceRequest request, Type resultReturnType, JsonSerializerSettings jsonSettings)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
request.Overrides = TracingContext.TryGetOverrides();
request.TracingData = new TracingData
{
HostName = CurrentApplicationInfo.HostName?.ToUpperInvariant(),
ServiceName = CurrentApplicationInfo.Name,
RequestID = TracingContext.TryGetRequestID(),
SpanID = Guid.NewGuid().ToString("N"), //Each call is new span
ParentSpanID = TracingContext.TryGetSpanID(),
SpanStartTime = DateTimeOffset.UtcNow,
AbandonRequestBy = TracingContext.AbandonRequestBy
};
PrepareRequest?.Invoke(request);
var requestContent = JsonConvert.SerializeObject(request, jsonSettings);
while (true)
{
var config = GetConfig();
var clientCallEvent = EventPublisher.CreateEvent();
clientCallEvent.TargetService = ServiceName;
clientCallEvent.RequestId = request.TracingData?.RequestID;
clientCallEvent.TargetMethod = request.Target.MethodName;
clientCallEvent.SpanId = request.TracingData?.SpanID;
clientCallEvent.ParentSpanId = request.TracingData?.ParentSpanID;
string responseContent;
HttpResponseMessage response;
IEndPointHandle endPoint = await ServiceDiscovery.GetNextHost(clientCallEvent.RequestId).ConfigureAwait(false);
int?effectivePort = GetEffectivePort(endPoint, config);
if (effectivePort == null)
{
throw new ConfigurationException("Cannot access service. Service Port not configured. See tags to find missing configuration", unencrypted: new Tags {
{ "ServiceName", ServiceName },
{ "Required configuration key", $"Discovery.{ServiceName}.DefaultPort" }
});
}
// The URL is only for a nice experience in Fiddler, it's never parsed/used for anything.
var uri = BuildUri(endPoint.HostName, effectivePort.Value, config) + ServiceName;
if (request.Target.MethodName != null)
{
uri += $".{request.Target.MethodName}";
}
if (request.Target.Endpoint != null)
{
uri += $"/{request.Target.Endpoint}";
}
try
{
Log.Debug(_ => _("ServiceProxy: Calling remote service. See tags for details.",
unencryptedTags: new
{
remoteEndpoint = endPoint.HostName,
remotePort = effectivePort,
remoteServiceName = ServiceName,
remoteMethodName = request.Target.MethodName
}));
clientCallEvent.TargetHostName = endPoint.HostName;
clientCallEvent.TargetPort = effectivePort.Value;
var httpContent = new StringContent(requestContent, Encoding.UTF8, "application/json");
httpContent.Headers.Add(HSHttpHeaders.ProtocolVersion, HttpServiceRequest.ProtocolVersion);
clientCallEvent.RequestStartTimestamp = Stopwatch.GetTimestamp();
try
{
response = await GetHttpClient(config).PostAsync(uri, httpContent).ConfigureAwait(false);
responseContent = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
}
finally
{
clientCallEvent.ResponseEndTimestamp = Stopwatch.GetTimestamp();
}
if (response.Headers.TryGetValues(HSHttpHeaders.ExecutionTime, out IEnumerable <string> values))
{
var time = values.FirstOrDefault();
if (TimeSpan.TryParse(time, out TimeSpan executionTime))
{
clientCallEvent.ServerTimeMs = executionTime.TotalMilliseconds;
}
}
}
catch (HttpRequestException ex)
{
Log.Error("The remote service failed to return a valid HTTP response. Continuing to next " +
"host. See tags for URL and exception for details.",
exception: ex,
unencryptedTags: new { uri });
endPoint.ReportFailure(ex);
clientCallEvent.Exception = ex;
EventPublisher.TryPublish(clientCallEvent); // fire and forget!
continue;
}
catch (TaskCanceledException ex)
{
Exception rex = new RemoteServiceException("The request to the remote service exceeded the " +
"allotted timeout. See the 'RequestUri' property on this exception for the URL that was " +
"called and the tag 'requestTimeout' for the configured timeout.",
uri,
ex,
unencrypted: new Tags
{
{ "requestTimeout", LastHttpClient?.Timeout.ToString() },
{ "requestUri", uri }
});
clientCallEvent.Exception = rex;
EventPublisher.TryPublish(clientCallEvent); // fire and forget!
throw rex;
}
if (response.Headers.Contains(HSHttpHeaders.ServerHostname) || response.Headers.Contains(HSHttpHeaders.ProtocolVersion))
{
try
{
endPoint.ReportSuccess();
if (response.IsSuccessStatusCode)
{
var returnObj = JsonConvert.DeserializeObject(responseContent, resultReturnType, jsonSettings);
clientCallEvent.ErrCode = 0;
EventPublisher.TryPublish(clientCallEvent); // fire and forget!
return(returnObj);
}
else
{
Exception remoteException;
try
{
remoteException = ExceptionSerializer.Deserialize(responseContent);
}
catch (Exception ex)
{
throw new RemoteServiceException("The remote service returned a failure response " +
"that failed to deserialize. See the 'RequestUri' property on this exception " +
"for the URL that was called, the inner exception for the exact error and the " +
"'responseContent' encrypted tag for the original response content.",
uri,
ex,
unencrypted: new Tags {
{ "requestUri", uri }
},
encrypted: new Tags {
{ "responseContent", responseContent }
});
}
clientCallEvent.Exception = remoteException;
EventPublisher.TryPublish(clientCallEvent); // fire and forget!
if (remoteException is RequestException || remoteException is EnvironmentException)
{
ExceptionDispatchInfo.Capture(remoteException).Throw();
}
if (remoteException is UnhandledException)
{
remoteException = remoteException.InnerException;
}
throw new RemoteServiceException("The remote service returned a failure response. See " +
"the 'RequestUri' property on this exception for the URL that was called, and the " +
"inner exception for details.",
uri,
remoteException,
unencrypted: new Tags {
{ "requestUri", uri }
});
}
}
catch (JsonException ex)
{
Log.Error("The remote service returned a response with JSON that failed " +
"deserialization. See the 'uri' tag for the URL that was called, the exception for the " +
"exact error and the 'responseContent' encrypted tag for the original response content.",
exception: ex,
unencryptedTags: new { uri },
encryptedTags: new { responseContent });
clientCallEvent.Exception = ex;
EventPublisher.TryPublish(clientCallEvent); // fire and forget!
throw new RemoteServiceException("The remote service returned a response with JSON that " +
"failed deserialization. See the 'RequestUri' property on this exception for the URL " +
"that was called, the inner exception for the exact error and the 'responseContent' " +
"encrypted tag for the original response content.",
uri,
ex,
new Tags {
{ "responseContent", responseContent }
},
new Tags {
{ "requestUri", uri }
});
}
}
else
{
var exception = response.StatusCode == HttpStatusCode.ServiceUnavailable ?
new Exception($"The remote service is unavailable (503) and is not recognized as a HS host at uri: {uri}") :
new Exception($"The remote service returned a response but is not recognized as a HS host at uri: {uri}");
endPoint.ReportFailure(exception);
if (response.StatusCode == HttpStatusCode.ServiceUnavailable)
{
Log.Error("The remote service is unavailable (503) and is not recognized as a HS host. Continuing to next host.", unencryptedTags: new { uri });
}
else
{
Log.Error("The remote service returned a response but is not recognized as a HS host. Continuing to next host.", unencryptedTags: new { uri, statusCode = response.StatusCode }, encryptedTags: new { responseContent });
}
clientCallEvent.ErrCode = 500001; //(int)GSErrors.General_Server_Error;
EventPublisher.TryPublish(clientCallEvent); // fire and forget!
}
}
}
private int?GetEffectivePort(IEndPointHandle endpoint, ServiceDiscoveryConfig config)
{
return(endpoint.Port ?? DefaultPort ?? config.DefaultPort);
}