code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.skywalking.library.elasticsearch.client;
  
  import com.linecorp.armeria.client.WebClient;
  import com.linecorp.armeria.common.HttpData;
  import com.linecorp.armeria.common.HttpStatus;
  import com.linecorp.armeria.common.util.Exceptions;
  import java.io.InputStream;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.CompletableFuture;
  import lombok.RequiredArgsConstructor;
  import lombok.SneakyThrows;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.library.elasticsearch.ElasticSearchVersion;
  import org.apache.skywalking.library.elasticsearch.requests.IndexRequest;
  import org.apache.skywalking.library.elasticsearch.requests.UpdateRequest;
  import org.apache.skywalking.library.elasticsearch.response.Document;
  import org.apache.skywalking.library.elasticsearch.response.Documents;
  
  @Slf4j
  @RequiredArgsConstructor
  public final class DocumentClient {
      private final CompletableFuture<ElasticSearchVersion> version;
  
      private final WebClient client;
  
      @SneakyThrows
      public boolean exists(String index, String type, String id) {
          return version.thenCompose(
              v -> client.execute(v.requestFactory().document().exist(index, type, id))
                         .aggregate().thenApply(response -> response.status() == HttpStatus.OK)
                         .exceptionally(e -> {
                             log.error("Failed to check whether document exists", e);
                             return false;
                         })).get();
      }
  
      @SneakyThrows
      public Optional<Document> get(String index, String type, String id) {
          final CompletableFuture<Optional<Document>> future = version.thenCompose(
              v -> client.execute(v.requestFactory().document().get(index, type, id))
                         .aggregate().thenApply(response -> {
                      if (response.status() != HttpStatus.OK) {
                          throw new RuntimeException(response.contentUtf8());
                      }
  
                      try (final HttpData content = response.content();
                           final InputStream is = content.toInputStream()) {
                          final Document document = v.codec().decode(is, Document.class);
                          if (!document.isFound()) {
                              return Optional.empty();
                          }
                          return Optional.of(document);
                      } catch (Exception e) {
                          return Exceptions.throwUnsafely(e);
                      }
                  }));
          future.whenComplete((result, exception) -> {
              if (exception != null) {
                  log.error("Failed to get doc by id {} in index {}", id, index, exception);
                  return;
              }
              if (log.isDebugEnabled()) {
                  log.debug("Doc by id {} in index {}: {}", id, index, result);
              }
          });
          return future.get();
      }
  
      @SneakyThrows
      public Optional<Documents> mget(String type, Map<String, List<String>> indexIds) {
          final CompletableFuture<Optional<Documents>> future =
              version.thenCompose(
                  v -> client.execute(v.requestFactory().document().mget(type, indexIds))
                             .aggregate().thenApply(response -> {
                          if (response.status() != HttpStatus.OK) {
                              throw new RuntimeException(response.contentUtf8());
                          }
  
                          try (final HttpData content = response.content();
                               final InputStream is = content.toInputStream()) {
                              return Optional.of(v.codec().decode(is, Documents.class));
                          } catch (Exception e) {
                              return Exceptions.throwUnsafely(e);
                          }
                      }));
          future.whenComplete((result, exception) -> {
              if (exception != null) {
                  log.error("Failed to get doc by indexIds {}", indexIds, exception);
                  return;
              }
              if (log.isDebugEnabled()) {
                  log.debug("Docs by indexIds {}: {}", indexIds, result);
              }
          });
          return future.get();
      }
  
      @SneakyThrows
      public void index(IndexRequest request, Map<String, Object> params) {
          final CompletableFuture<Void> future = version.thenCompose(
              v -> client.execute(v.requestFactory().document().index(request, params))
                         .aggregate().thenAccept(response -> {
                      final HttpStatus status = response.status();
                      if (status != HttpStatus.CREATED && status != HttpStatus.OK) {
                          throw new RuntimeException(response.contentUtf8());
                      }
                  }));
          future.whenComplete((result, exception) -> {
              if (exception != null) {
                  log.error("Failed to index doc: {}, params: {}", request, params, exception);
                  return;
              }
              if (log.isDebugEnabled()) {
                  log.debug("Succeeded indexing doc: {}, params: {}", request, params);
              }
          });
          future.join();
      }
  
      @SneakyThrows
      public void update(UpdateRequest request, Map<String, Object> params) {
          final CompletableFuture<Void> future = version.thenCompose(
              v -> client.execute(v.requestFactory().document().update(request, params))
                         .aggregate().thenAccept(response -> {
                      final HttpStatus status = response.status();
                      if (status != HttpStatus.OK) {
                          throw new RuntimeException(response.contentUtf8());
                      }
                  }));
          future.whenComplete((result, exception) -> {
              if (exception != null) {
                  log.error("Failed to update doc: {}, params: {}", request, params, exception);
                  return;
              }
              if (log.isDebugEnabled()) {
                  log.debug("Succeeded updating doc: {}, params: {}", request, params);
              }
          });
          future.join();
      }
  }
  