private async Task <HttpResponseMessage> GetHttpResponse(string baseUri, ElasticRequestParams eparams, string json)
{
HttpResponseMessage response = null;
var indexUri = $"{baseUri}/{_indexName}";
var policy = GetOrCreatePolicy(indexUri);
var client = CreateClient(baseUri);
try
{
response = await SendAsync(client, eparams.Verb, policy, eparams.GetUri(), json);
}
catch (HttpRequestException ex)
{
_logger.Error(ex, "Elastic connection error for {indexUri}", indexUri);
_exceptions.Add(ex);
}
catch (BrokenCircuitException ex)
{
_logger.Error(ex, "Circuit broken for {indexUri}", indexUri);
_exceptions.Add(ex);
}
catch (OperationCanceledException ex)
{
_logger.Info(ex, "Elastic connection timeout for {indexUri}", indexUri);
_exceptions.Add(ex);
}
catch (Exception ex)
{
_logger.Info(ex, "Unexpected exception for {indexUri}", indexUri);
_exceptions.Add(ex);
}
return(response);
}
private async Task <string> QueryAsync(ElasticRequestParams eparams, string json)
{
var randomIndexes = GetRandomIndexes();
_exceptions.Clear();
foreach (var index in randomIndexes)
{
var baseUri = _uris[index];
if (_logger.IsTraceEnabled)
{
_logger.Trace().Message("Processing request to Elastic")
.Property("baseUri", baseUri)
.Property("searchParams", eparams)
.Property("json", json)
.Write();
}
var response = await GetHttpResponse(baseUri, eparams, json);
if (response == null)
{
_logger.Trace("Response is null");
continue;
}
var result = await response.Content.ReadAsStringAsync();
if (response.IsSuccessStatusCode)
{
return(result);
}
var message = !string.IsNullOrEmpty(result) ? result : response.ReasonPhrase;
HandleErrorResult(response.StatusCode, message);
if (response.StatusCode == HttpStatusCode.NotFound)
{
_logger.Trace("Not found received");
if (eparams.ThrowNotFound)
{
break;
}
return("Not Found");
}
}
throw GetElasticClientException(eparams, json);
}
private Exception GetElasticClientException(ElasticRequestParams eparams, string json)
{
var resultEx = (_exceptions.Count > 1)
? new AggregateException("No successful results", _exceptions)
: _exceptions.FirstOrDefault() ?? new ApplicationException("Normally shouldn't be thrown");
throw new ElasticClientException("Elastic call failed: " + resultEx.Message, resultEx)
{
Request = json,
BaseUrls = _uris,
ElasticRequestParams = eparams
};
}
