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Why not to get cluster state with ClusterStateRequest using RestClient #667

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Why not to get cluster state with ClusterStateRequest using RestClient #667

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186 changes: 177 additions & 9 deletions src/main/java/org/opensearch/sdk/SDKClient.java
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Original file line number Diff line number Diff line change
Expand Up @@ -9,9 +9,14 @@

package org.opensearch.sdk;

import static org.opensearch.common.xcontent.XContentParserUtils.ensureExpectedToken;

import java.io.Closeable;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

Expand All @@ -22,6 +27,7 @@
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.guava.GuavaModule;
import org.apache.hc.core5.function.Factory;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.client5.http.ssl.NoopHostnameVerifier;
import org.apache.hc.client5.http.ssl.ClientTlsStrategyBuilder;
Expand All @@ -34,6 +40,8 @@
import org.opensearch.action.ActionRequest;
import org.opensearch.action.ActionResponse;
import org.opensearch.action.ActionType;
import org.opensearch.action.admin.cluster.state.ClusterStateRequest;
import org.opensearch.action.admin.cluster.state.ClusterStateResponse;
import org.opensearch.action.admin.indices.alias.get.GetAliasesRequest;
import org.opensearch.action.admin.indices.delete.DeleteIndexRequest;
import org.opensearch.action.admin.indices.settings.put.UpdateSettingsRequest;
Expand All @@ -49,14 +57,15 @@
import org.opensearch.action.search.MultiSearchResponse;
import org.opensearch.action.search.SearchRequest;
import org.opensearch.action.search.SearchResponse;
import org.opensearch.action.support.IndicesOptions;
import org.opensearch.action.support.IndicesOptions.WildcardStates;
import org.opensearch.action.support.TransportAction;
import org.opensearch.action.support.master.AcknowledgedResponse;
import org.opensearch.action.update.UpdateRequest;
import org.opensearch.action.update.UpdateResponse;
import org.opensearch.client.Cancellable;
import org.opensearch.client.Client;
import org.opensearch.client.ClusterAdminClient;
import org.opensearch.client.ClusterClient;
import org.opensearch.client.GetAliasesResponse;
import org.opensearch.client.IndicesClient;
import org.opensearch.client.RequestOptions;
Expand All @@ -79,6 +88,18 @@
import org.opensearch.client.opensearch.OpenSearchClient;
import org.opensearch.client.transport.OpenSearchTransport;
import org.opensearch.client.transport.rest_client.RestClientTransport;
import org.opensearch.cluster.ClusterName;
import org.opensearch.cluster.ClusterState;
import org.opensearch.cluster.ClusterState.Custom;
import org.opensearch.cluster.block.ClusterBlocks;
import org.opensearch.cluster.metadata.Metadata;
import org.opensearch.cluster.node.DiscoveryNodes;
import org.opensearch.cluster.routing.RoutingTable;
import org.opensearch.common.collect.ImmutableOpenMap;
import org.opensearch.common.xcontent.LoggingDeprecationHandler;
import org.opensearch.common.xcontent.XContentType;
import org.opensearch.core.xcontent.NamedXContentRegistry;
import org.opensearch.core.xcontent.XContentParser;

import javax.net.ssl.SSLEngine;

Expand Down Expand Up @@ -371,7 +392,7 @@ public SDKRestClient admin() {
* @return An instance of a cluster admin client.
*/
public SDKClusterAdminClient cluster() {
return new SDKClusterAdminClient(restHighLevelClient.cluster());
return new SDKClusterAdminClient(restHighLevelClient);
}

/**
Expand Down Expand Up @@ -521,20 +542,167 @@ public void close() throws IOException {
*/
public static class SDKClusterAdminClient {

private final ClusterClient clusterClient;
private final RestHighLevelClient restHighLevelClient;

/**
* Instantiate this class using a {@link ClusterClient}.
* Instantiate this class.
*
* @param clusterClient The client to wrap
* @param restHighLevelClient The Rest client to use for wrapped functions
*/
public SDKClusterAdminClient(ClusterClient clusterClient) {
this.clusterClient = clusterClient;
public SDKClusterAdminClient(RestHighLevelClient restHighLevelClient) {
this.restHighLevelClient = restHighLevelClient;
}

// TODO: Implement state()
// https://github.com/opensearch-project/opensearch-sdk-java/issues/354
/**
* The state of the cluster.
*
* @param request The cluster state request.
* @param listener A listener to be notified with a result
* @return a cancellable async operation
*/
Cancellable state(ClusterStateRequest request, ActionListener<ClusterStateResponse> listener) {
Request restRequest = new Request("GET", "/_cluster/state");
Map<String, String> params = new HashMap<>();

// add any metrics, comma-delimited
EnumSet<ClusterState.Metric> metrics = EnumSet.noneOf(ClusterState.Metric.class);
if (request.routingTable()) {
metrics.add(ClusterState.Metric.ROUTING_TABLE);
}
if (request.nodes()) {
metrics.add(ClusterState.Metric.NODES);
}
if (request.metadata()) {
metrics.add(ClusterState.Metric.METADATA);
}
if (request.blocks()) {
metrics.add(ClusterState.Metric.BLOCKS);
}
if (request.customs()) {
metrics.add(ClusterState.Metric.CUSTOMS);
}
if (!metrics.isEmpty()) {
params.put("metric", metrics.stream().map(ClusterState.Metric::toString).collect(Collectors.joining(",")));
}

// add any indices; if none will default to _all
if (request.indices().length > 0) {
params.put("indices", Arrays.stream(request.indices()).collect(Collectors.joining(",")));
}

// add inidces options
IndicesOptions options = request.indicesOptions();
String expandWildcards = options.getExpandWildcards()
.stream()
.map(WildcardStates::name)
.map(String::toLowerCase)
.collect(Collectors.joining(","));
if (!expandWildcards.isEmpty()) {
params.put("expand_wildcards", expandWildcards);
}
params.put("ignore_unavailable", Boolean.toString(options.ignoreUnavailable()));
params.put("allow_no_indices", Boolean.toString(options.allowNoIndices()));
params.put("ignore_throttled", Boolean.toString(options.ignoreThrottled()));

// Add other values
params.put("wait_for_timeout", request.waitForTimeout().getStringRep());
params.put("wait_for_metadata_version", Long.toString(request.waitForMetadataVersion()));
params.put("cluster_manager_timeout", request.clusterManagerNodeTimeout().getStringRep());

// Add params to request and we're done with the request
restRequest.addParameters(params);

ResponseListener responseListener = new ResponseListener() {
@Override
public void onSuccess(Response response) {
HttpEntity body = response.getEntity();
XContentType type = XContentType.fromFormat(body.getContentType());
if (type != null) {
try {
ClusterName clusterName = null;
long version = 0L;
String stateUUID = null;
Metadata metadata = null;
RoutingTable routingTable = null;
DiscoveryNodes nodes = null;
ClusterBlocks blocks = null;
ImmutableOpenMap<String, Custom> customs = null;
int minimumClusterManagerNodesOnPublishingClusterManager = 0;

XContentParser parser = type.xContent()
.createParser(NamedXContentRegistry.EMPTY, LoggingDeprecationHandler.INSTANCE, body.getContent());
ensureExpectedToken(XContentParser.Token.START_OBJECT, parser.currentToken(), parser);
while (parser.nextToken() != XContentParser.Token.END_OBJECT) {
String fieldName = parser.currentName();
parser.nextToken();

switch (fieldName) {
case "cluster_name":
clusterName = new ClusterName(parser.text());
break;
case "version":
version = parser.longValue();
break;
case "state_uuid":
stateUUID = parser.text();
break;
case "metadata":
case "meta-data":
metadata = Metadata.fromXContent(parser);
break;
case "routing_table":
fieldName = parser.currentName(); // "indices"
parser.nextToken();
while (parser.nextToken() != XContentParser.Token.END_OBJECT) {
fieldName = parser.currentName();
parser.nextToken();
// NOT TODO: I'm giving up on trying to parse this mess
}
break;
case "routing_nodes":
// Same horrible nested parsing as routing_table
break;
case "blocks":
// Nobody bothered to do ClusterBlock fromXContent either
break;
case "nodes":
// Guess what? No DiscoveryNode fromXContent
break;
case "I don't even know what key to look for for customs as they are subclasses":
// Yeah. I'm giving up
break;
default:
}

}
ClusterState state = new ClusterState(
clusterName,
version,
stateUUID,
metadata,
routingTable,
nodes,
blocks,
customs,
minimumClusterManagerNodesOnPublishingClusterManager,
false
);

ClusterStateResponse clusterStateResponse = new ClusterStateResponse(clusterName, state, false);
listener.onResponse(clusterStateResponse);
} catch (UnsupportedOperationException | IOException e) {
listener.onFailure(e);
}
}
}

@Override
public void onFailure(Exception exception) {
listener.onFailure(exception);
}
};
return restHighLevelClient.getLowLevelClient().performRequestAsync(restRequest, responseListener);
}
}

/**
Expand Down