internal async Task <IQueryResult <T> > ExecuteQuery <T>(string statement, QueryOptions options, IDataMapper dataMapper)
{
// try get Query node
if (!ClusterOptions.GlobalNodes.TryGetRandom(x => x.HasQuery(), out var node))
{
const string noNodeAvailableMessage = "Unable to locate query node to submit query to.";
Logger.LogError(noNodeAvailableMessage);
throw new ServiceNotAvailableException(ServiceType.Query);
}
options.Statement(statement);
var body = options.GetFormValuesAsJson();
StreamingQueryResult <T> queryResult;
using (var content = new StringContent(body, System.Text.Encoding.UTF8, MediaType.Json))
{
try
{
var response = await HttpClient.PostAsync(node.QueryUri, content, options.CancellationToken)
.ConfigureAwait(false);
var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false);
queryResult = new StreamingQueryResult <T>
{
ResponseStream = stream,
HttpStatusCode = response.StatusCode,
Success = response.StatusCode == HttpStatusCode.OK
};
if (response.StatusCode != HttpStatusCode.OK)
{
//read the header and stop when we reach the queried rows
queryResult.ReadToRows();
if (response.StatusCode != HttpStatusCode.OK || queryResult.Status != QueryStatus.Success)
{
throw new QueryException(queryResult.Message,
queryResult.Status,
queryResult.Errors);
}
}
}
catch (TaskCanceledException e)
{
throw new TimeoutException("The request has timed out.", e);
}
}
return(queryResult);
}
public async Task <IQueryResult <T> > QueryAsync <T>(string statement, IQueryOptions options, CancellationToken cancellationToken)
{
//TODO make url selection round-robin
var clusterNode = Configuration.GlobalNodes.GetRandom(x => x.HasQuery());
options.Statement(statement);
var body = options.GetFormValuesAsJson();
StreamingQueryResult <T> queryResult;
using (var content = new StringContent(body, System.Text.Encoding.UTF8, MediaType.Json))
{
try
{
var response = await HttpClient.PostAsync(clusterNode.QueryUri, content, cancellationToken)
.ConfigureAwait(false);
var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false);
queryResult = new StreamingQueryResult <T>
{
ResponseStream = stream,
HttpStatusCode = response.StatusCode,
Success = response.StatusCode == HttpStatusCode.OK,
};
if (response.StatusCode != HttpStatusCode.OK)
{
//read the header and stop when we reach the queried rows
queryResult.ReadToRows();
if (response.StatusCode != HttpStatusCode.OK || queryResult.Status != QueryStatus.Success)
{
throw new QueryException(queryResult.Message,
queryResult.Status,
queryResult.Errors);
}
}
}
catch (TaskCanceledException e)
{
throw new TimeoutException("The request has timed out.", e);
}
}
return(queryResult);
}
public async Task <IQueryResult <T> > QueryAsync <T>(string statement, IQueryOptions options, CancellationToken cancellationToken)
{
var uriBuilder = new UriBuilder(Configuration.Servers.GetRandom())
{
Scheme = "http",
Path = "/query",
Port = 8093
};
options.Statement(statement);
var body = options.GetFormValuesAsJson();
StreamingQueryResult <T> queryResult = null;
using (var content = new StringContent(body, System.Text.Encoding.UTF8, MediaType.Json))
{
try
{
var response = await HttpClient.PostAsync(uriBuilder.Uri, content, cancellationToken)
.ConfigureAwait(false);
var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false);
queryResult = new StreamingQueryResult <T>
{
ResponseStream = stream,
HttpStatusCode = response.StatusCode,
Success = response.StatusCode == HttpStatusCode.OK,
};
if (response.StatusCode != HttpStatusCode.OK)
{
//read the header and stop when we reach the queried rows
queryResult.ReadToRows();
//A problem with the HTTP request itself
if (response.StatusCode == HttpStatusCode.BadRequest)
{
throw new QueryErrorException(response.ReasonPhrase,
queryResult.Status,
queryResult.Errors);
}
//A problem with the service itself
if (response.StatusCode == HttpStatusCode.ServiceUnavailable)
{
throw new QueryServiceException(response.ReasonPhrase,
queryResult.Status,
queryResult.Errors);
}
//A problem with the query iteself
if (queryResult.Status != QueryStatus.Success)
{
throw new QueryException(queryResult.Message,
queryResult.Status,
queryResult.Errors);
}
}
}
catch (TaskCanceledException e)
{
throw new TimeoutException("The request has timed out.");
}
}
return(queryResult);
}