Implement get datasource api

Signed-off-by: Heemin Kim <heemin@amazon.com>

Author: heemin32

src/main/java/org/opensearch/geospatial/ip2geo/action/GetDatasourceAction.java

@@ -0,0 +1,29 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.geospatial.ip2geo.action;
+
+import org.opensearch.action.ActionType;
+
+/**
+ * Ip2Geo datasource get action
+ */
+public class GetDatasourceAction extends ActionType<GetDatasourceResponse> {
+    /**
+     * Get datasource action instance
+     */
+    public static final GetDatasourceAction INSTANCE = new GetDatasourceAction();
+    /**
+     * Name of a get datasource action
+     */
+    public static final String NAME = "cluster:admin/geospatial/datasource/get";
+
+    private GetDatasourceAction() {
+        super(NAME, GetDatasourceResponse::new);
+    }
+}

src/main/java/org/opensearch/geospatial/ip2geo/action/GetDatasourceRequest.java

@@ -0,0 +1,69 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.geospatial.ip2geo.action;
+
+import java.io.IOException;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.extern.log4j.Log4j2;
+
+import org.opensearch.action.ActionRequest;
+import org.opensearch.action.ActionRequestValidationException;
+import org.opensearch.common.io.stream.StreamInput;
+import org.opensearch.common.io.stream.StreamOutput;
+
+/**
+ * Ip2Geo datasource get request
+ */
+@Getter
+@Setter
+@Log4j2
+@EqualsAndHashCode
+public class GetDatasourceRequest extends ActionRequest {
+    /**
+     * @param names the datasource names
+     * @return the datasource names
+     */
+    private String[] names;
+
+    /**
+     * Constructs a new get datasource request with a list of datasources.
+     *
+     * If the list of datasources is empty or it contains a single element "_all", all registered datasources
+     * are returned.
+     *
+     * @param names list of datasource names
+     */
+    public GetDatasourceRequest(final String[] names) {
+        this.names = names;
+    }
+
+    /**
+     * Constructor with stream input
+     * @param in the stream input
+     * @throws IOException IOException
+     */
+    public GetDatasourceRequest(final StreamInput in) throws IOException {
+        super(in);
+        this.names = in.readStringArray();
+    }
+
+    @Override
+    public ActionRequestValidationException validate() {
+        return null;
+    }
+
+    @Override
+    public void writeTo(final StreamOutput out) throws IOException {
+        super.writeTo(out);
+        out.writeStringArray(names);
+    }
+}

src/main/java/org/opensearch/geospatial/ip2geo/action/GetDatasourceResponse.java

@@ -0,0 +1,92 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.geospatial.ip2geo.action;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.util.List;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.extern.log4j.Log4j2;
+
+import org.opensearch.action.ActionResponse;
+import org.opensearch.common.io.stream.StreamInput;
+import org.opensearch.common.io.stream.StreamOutput;
+import org.opensearch.core.xcontent.ToXContentObject;
+import org.opensearch.core.xcontent.XContentBuilder;
+import org.opensearch.geospatial.ip2geo.jobscheduler.Datasource;
+
+/**
+ * Ip2Geo datasource get request
+ */
+@Getter
+@Setter
+@Log4j2
+@EqualsAndHashCode
+public class GetDatasourceResponse extends ActionResponse implements ToXContentObject {
+    private static final String FIELD_NAME_DATASOURCES = "datasources";
+    private static final String FIELD_NAME_NAME = "name";
+    private static final String FIELD_NAME_STATE = "state";
+    private static final String FIELD_NAME_ENDPOINT = "endpoint";
+    private static final String FIELD_NAME_UPDATE_INTERVAL = "update_interval_in_days";
+    private static final String FIELD_NAME_NEXT_UPDATE_AT = "next_update_at_in_epoch_millis";
+    private static final String FIELD_NAME_NEXT_UPDATE_AT_READABLE = "next_update_at";
+    private static final String FIELD_NAME_DATABASE = "database";
+    private static final String FIELD_NAME_UPDATE_STATS = "update_stats";
+    private List<Datasource> datasources;
+
+    /**
+     * Default constructor
+     *
+     * @param datasources List of datasources
+     */
+    public GetDatasourceResponse(final List<Datasource> datasources) {
+        this.datasources = datasources;
+    }
+
+    /**
+     * Constructor with StreamInput
+     *
+     * @param in the stream input
+     */
+    public GetDatasourceResponse(final StreamInput in) throws IOException {
+        datasources = in.readList(Datasource::new);
+    }
+
+    @Override
+    public void writeTo(final StreamOutput out) throws IOException {
+        out.writeList(datasources);
+    }
+
+    @Override
+    public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
+        builder.startObject();
+        builder.startArray(FIELD_NAME_DATASOURCES);
+        for (Datasource datasource : datasources) {
+            builder.startObject();
+            builder.field(FIELD_NAME_NAME, datasource.getName());
+            builder.field(FIELD_NAME_STATE, datasource.getState());
+            builder.field(FIELD_NAME_ENDPOINT, datasource.getEndpoint());
+            builder.field(FIELD_NAME_UPDATE_INTERVAL, datasource.getSchedule().getInterval());
+            builder.timeField(
+                FIELD_NAME_NEXT_UPDATE_AT,
+                FIELD_NAME_NEXT_UPDATE_AT_READABLE,
+                datasource.getSchedule().getNextExecutionTime(Instant.now()).toEpochMilli()
+            );
+            builder.field(FIELD_NAME_DATABASE, datasource.getDatabase());
+            builder.field(FIELD_NAME_UPDATE_STATS, datasource.getUpdateStats());
+            builder.endObject();
+        }
+        builder.endArray();
+        builder.endObject();
+        return builder;
+    }
+}

src/main/java/org/opensearch/geospatial/ip2geo/action/GetDatasourceTransportAction.java

@@ -0,0 +1,76 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.geospatial.ip2geo.action;
+
+import java.util.List;
+
+import lombok.extern.log4j.Log4j2;
+
+import org.opensearch.action.ActionListener;
+import org.opensearch.action.support.ActionFilters;
+import org.opensearch.action.support.HandledTransportAction;
+import org.opensearch.common.inject.Inject;
+import org.opensearch.geospatial.ip2geo.common.DatasourceFacade;
+import org.opensearch.geospatial.ip2geo.jobscheduler.Datasource;
+import org.opensearch.tasks.Task;
+import org.opensearch.transport.TransportService;
+
+/**
+ * Transport action to get datasource
+ */
+@Log4j2
+public class GetDatasourceTransportAction extends HandledTransportAction<GetDatasourceRequest, GetDatasourceResponse> {
+    private final DatasourceFacade datasourceFacade;
+
+    /**
+     * Default constructor
+     * @param transportService the transport service
+     * @param actionFilters the action filters
+     * @param datasourceFacade the datasource facade
+     */
+    @Inject
+    public GetDatasourceTransportAction(
+        final TransportService transportService,
+        final ActionFilters actionFilters,
+        final DatasourceFacade datasourceFacade
+    ) {
+        super(GetDatasourceAction.NAME, transportService, actionFilters, GetDatasourceRequest::new);
+        this.datasourceFacade = datasourceFacade;
+    }
+
+    @Override
+    protected void doExecute(final Task task, final GetDatasourceRequest request, final ActionListener<GetDatasourceResponse> listener) {
+        if (request.getNames().length == 0 || (request.getNames().length == 1 && "_all".equals(request.getNames()[0]))) {
+            // We don't expect too many data sources. Therefore, querying all data sources without pagination should be fine.
+            datasourceFacade.getAllDatasources(new ActionListener<>() {
+                @Override
+                public void onResponse(final List<Datasource> datasources) {
+                    listener.onResponse(new GetDatasourceResponse(datasources));
+                }
+
+                @Override
+                public void onFailure(final Exception e) {
+                    listener.onFailure(e);
+                }
+            });
+        } else {
+            datasourceFacade.getDatasources(request.getNames(), new ActionListener<>() {
+                @Override
+                public void onResponse(final List<Datasource> datasources) {
+                    listener.onResponse(new GetDatasourceResponse(datasources));
+                }
+
+                @Override
+                public void onFailure(final Exception e) {
+                    listener.onFailure(e);
+                }
+            });
+        }
+    }
+}

src/main/java/org/opensearch/geospatial/ip2geo/action/RestGetDatasourceHandler.java

@@ -0,0 +1,48 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.geospatial.ip2geo.action;
+
+import static org.opensearch.geospatial.shared.URLBuilder.URL_DELIMITER;
+import static org.opensearch.geospatial.shared.URLBuilder.getPluginURLPrefix;
+import static org.opensearch.rest.RestRequest.Method.GET;
+
+import java.util.List;
+
+import org.opensearch.client.node.NodeClient;
+import org.opensearch.common.Strings;
+import org.opensearch.rest.BaseRestHandler;
+import org.opensearch.rest.RestRequest;
+import org.opensearch.rest.action.RestToXContentListener;
+
+/**
+ * Rest handler for Ip2Geo datasource get request
+ */
+public class RestGetDatasourceHandler extends BaseRestHandler {
+    private static final String ACTION_NAME = "ip2geo_datasource_get";
+
+    @Override
+    public String getName() {
+        return ACTION_NAME;
+    }
+
+    @Override
+    protected RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) {
+        final String[] names = request.paramAsStringArray("name", Strings.EMPTY_ARRAY);
+        final GetDatasourceRequest getDatasourceRequest = new GetDatasourceRequest(names);
+
+        return channel -> client.executeLocally(GetDatasourceAction.INSTANCE, getDatasourceRequest, new RestToXContentListener<>(channel));
+    }
+
+    @Override
+    public List<Route> routes() {
+        String path1 = String.join(URL_DELIMITER, getPluginURLPrefix(), "ip2geo/datasource");
+        String path2 = String.join(URL_DELIMITER, getPluginURLPrefix(), "ip2geo/datasource/{name}");
+        return List.of(new Route(GET, path1), new Route(GET, path2));
+    }
+}

src/main/java/org/opensearch/geospatial/ip2geo/action/RestPutDatasourceHandler.java

@@ -39,7 +39,7 @@
  *
  */
 public class RestPutDatasourceHandler extends BaseRestHandler {
-    private static final String ACTION_NAME = "ip2geo_datasource";
+    private static final String ACTION_NAME = "ip2geo_datasource_put";
     private final ClusterSettings clusterSettings;
 
     public RestPutDatasourceHandler(final ClusterSettings clusterSettings) {
@@ -53,7 +53,7 @@ public String getName() {
 
     @Override
     protected RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
-        final PutDatasourceRequest putDatasourceRequest = new PutDatasourceRequest(request.param("id"));
+        final PutDatasourceRequest putDatasourceRequest = new PutDatasourceRequest(request.param("name"));
         if (request.hasContentOrSourceParam()) {
             try (XContentParser parser = request.contentOrSourceParamParser()) {
                 PutDatasourceRequest.PARSER.parse(parser, putDatasourceRequest, null);
@@ -70,7 +70,7 @@ protected RestChannelConsumer prepareRequest(final RestRequest request, final No
 
     @Override
     public List<Route> routes() {
-        String path = String.join(URL_DELIMITER, getPluginURLPrefix(), "ip2geo/datasource/{id}");
+        String path = String.join(URL_DELIMITER, getPluginURLPrefix(), "ip2geo/datasource/{name}");
         return List.of(new Route(PUT, path));
     }
 }