/// <summary>
/// Gets all the fields for a given search collection
/// </summary>
/// <param name="searchCollectionName">The name of the search collection</param>
public static string[] GetFields(string searchCollectionName)
{
List <string> fieldList = new List <string>();
ESSiteWideSearchCollectionElement searchCollConfig = GetSearchCollectionConfig(searchCollectionName);
if (searchCollConfig == null)
{
throw new ConfigurationErrorsException("ElasticSearch SiteWideSearch collection, " + searchCollectionName + ", cannot be found in configuration.");
}
FieldElementCollection fieldConfigs = searchCollConfig.Fields;
foreach (FieldElement fieldElement in fieldConfigs)
{
fieldList.Add(fieldElement.FieldName);
}
return(fieldList.ToArray());
}
/// <summary>
/// Gets the search results from this SiteWideSearch provider.
/// </summary>
/// <param name="searchCollection">The search collection.</param>
/// <param name="term">The term.</param>
/// <param name="pageSize">Size of the page.</param>
/// <param name="offset">The offset.</param>
/// <returns></returns>
public override ISiteWideSearchResultCollection GetSearchResults(string searchCollection, string term, int pageSize, int offset)
{
ESSiteWideSearchCollectionElement searchCollConfig = ElasticSearchConfig.GetSearchCollectionConfig(searchCollection);
ClusterElement clusterConfig = searchCollConfig.ClusterElementDetails;
var connectionPool = new SniffingConnectionPool(searchCollConfig.ClusterNodes);
var config = new ConnectionConfiguration(connectionPool)
.UsePrettyResponses()
.MaximumRetries(clusterConfig.MaximumRetries)//try 5 times if the server is down
.ExposeRawResponse()
.ThrowOnElasticsearchServerExceptions();
var esClient = new ElasticsearchClient(config);
string[] fieldList = ElasticSearchConfig.GetFields(searchCollection);
//do search_template
var _body = new
{
template = new
{
id = searchCollConfig.Template
},
@params = new
{
my_value = term,
my_size = pageSize.ToString(),
my_from = offset.ToString(),
my_site = searchCollConfig.Site,
my_fields = fieldList
}
};
ElasticsearchResponse <DynamicDictionary> results = null;
try
{
results = esClient.SearchTemplate(searchCollConfig.Index, _body);
}
catch (MaxRetryException ex)
{
try
{
//log the maximum retry excpetion
log.Error("Error using the ESClient Search Template method. Maximum retry exception: ", ex);
//sleep for 5 seconds
Thread.Sleep(clusterConfig.ConnectionTimeoutDelay);
//try to fetch results again
results = esClient.SearchTemplate(searchCollConfig.Index, _body);
}
catch (Exception e)
{
log.Error("Error using the ESClient Search Template method.", e);
throw e;
}
}//retry catch log error sleep retry
List <ESSiteWideSearchResult> foundTerms = new List <ESSiteWideSearchResult>(pageSize);
if (results.Success)
{
var stringResponse = results.Response;
try
{
foreach (var hit in results.Response["hits"].hits)
{
//title is a special case and when it is empty the value needs to be Untitled
string title = SetFieldValue(hit, "title");
if (string.IsNullOrEmpty(title))
{
title = "Untitled";
}
string url = SetFieldValue(hit, "url");
string description = SetFieldValue(hit, "metatag.description");
string type = SetFieldValue(hit, "metatag.dcterms.type");
foundTerms.Add(new ESSiteWideSearchResult(title, url, description, type));
}
}
catch (Exception ex)
{
log.Error("Error retrieving search results.", ex);
throw ex;
}
}
else
{
string prettyResponse = "";
//log the raw response message
//if there is not response them log with message - "No message in response"
if (!string.IsNullOrEmpty(System.Text.Encoding.Default.GetString(results.ResponseRaw)))
{
prettyResponse = System.Text.Encoding.Default.GetString(results.ResponseRaw);
}
else
{
prettyResponse = "No message in response";
}
log.ErrorFormat("Search failed. Http Status Code: {0}. Message: {1}", results.HttpStatusCode.Value, prettyResponse);
throw (new Exception("Search failed. Http Status Code:" + results.HttpStatusCode.Value.ToString() + ". Message: " + prettyResponse));
}
//Return the results
return(new ESSiteWideSearchResultCollection(foundTerms.AsEnumerable())
{
ResultCount = results.Response["hits"].total
});
}
