| /* |
| * 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.drill.exec.server.rest; |
| |
| import org.apache.drill.exec.util.ValueVectorElementFormatter; |
| import org.apache.drill.shaded.guava.com.google.common.collect.Lists; |
| import org.apache.drill.shaded.guava.com.google.common.collect.Maps; |
| import org.apache.drill.shaded.guava.com.google.common.collect.Sets; |
| |
| import org.apache.drill.common.types.TypeProtos; |
| import org.apache.drill.exec.physical.impl.materialize.QueryDataPackage; |
| import org.apache.drill.exec.proto.GeneralRPCProtos.Ack; |
| import org.apache.drill.exec.record.VectorAccessible; |
| import org.apache.drill.exec.record.VectorContainer; |
| import org.apache.drill.exec.record.VectorWrapper; |
| import org.apache.drill.exec.rpc.Acks; |
| import org.apache.drill.exec.rpc.RpcOutcomeListener; |
| import org.apache.drill.exec.vector.ValueVector.Accessor; |
| import org.apache.drill.exec.record.BatchSchema; |
| import org.apache.drill.exec.record.MaterializedField; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.ArrayList; |
| import java.util.Set; |
| |
| /** |
| * {@code WebUserConnectionWrapper} which represents the {@code UserClientConnection} between |
| * WebServer and Foreman, for the WebUser submitting the query. It provides |
| * access to the {@code UserSession} executing the query. There is no actual physical |
| * channel corresponding to this connection wrapper. |
| * |
| * It returns a close future which do have an EventExecutor out of BitServer EventLoopGroup. |
| * Close future is set only when the {@link WebSessionResources} are closed. |
| */ |
| public class WebUserConnection extends BaseWebUserConnection { |
| |
| public final List<Map<String, String>> results = Lists.newArrayList(); |
| public final Set<String> columns = Sets.newLinkedHashSet(); |
| public final List<String> metadata = new ArrayList<>(); |
| private int autoLimitRowCount; |
| private int rowCount; |
| |
| WebUserConnection(WebSessionResources webSessionResources) { |
| super(webSessionResources); |
| } |
| |
| @Override |
| public void sendData(RpcOutcomeListener<Ack> listener, QueryDataPackage data) { |
| processBatch(data.batch()); |
| listener.success(Acks.OK, null); |
| } |
| |
| private void processBatch(VectorContainer batch) { |
| if (batch == null) { |
| // Empty query: no data, no schema. |
| return; |
| } |
| |
| // Build metadata only on first batch, or if the schema changes |
| if (metadata.isEmpty() || batch.isSchemaChanged()) { |
| columns.clear(); |
| metadata.clear(); |
| buildMetadata(batch.getSchema()); |
| } |
| addResults(batch.getRecordCount(), batch); |
| batch.zeroVectors(); |
| } |
| |
| private void buildMetadata(BatchSchema schema) { |
| for (int i = 0; i < schema.getFieldCount(); ++i) { |
| // DRILL-6847: This section adds query metadata to the REST results |
| MaterializedField col = schema.getColumn(i); |
| columns.add(col.getName()); |
| metadata.add(webDataType(col.getType())); |
| } |
| } |
| |
| private void addResults(int rows, VectorAccessible batch) { |
| ValueVectorElementFormatter formatter = new ValueVectorElementFormatter(webSessionResources.getSession().getOptions()); |
| if (autoLimitRowCount > 0) { |
| rows = Math.max(0, Math.min(rows, autoLimitRowCount - rowCount)); |
| } |
| for (int i = 0; i < rows; ++i) { |
| rowCount++; |
| final Map<String, String> record = Maps.newHashMap(); |
| for (VectorWrapper<?> vw : batch) { |
| final String field = vw.getValueVector().getMetadata().getNamePart().getName(); |
| final TypeProtos.MinorType fieldMinorType = vw.getValueVector().getMetadata().getMajorType().getMinorType(); |
| final Accessor accessor = vw.getValueVector().getAccessor(); |
| final Object value = i < accessor.getValueCount() ? accessor.getObject(i) : null; |
| final String display = value == null ? null : formatter.format(value, fieldMinorType); |
| record.put(field, display); |
| } |
| results.add(record); |
| } |
| } |
| |
| /** |
| * For authenticated WebUser no cleanup of {@link WebSessionResources} is done since it's re-used |
| * for all the queries until lifetime of the web session. |
| */ |
| public void cleanupSession() { } |
| |
| public static class AnonWebUserConnection extends WebUserConnection { |
| |
| AnonWebUserConnection(WebSessionResources webSessionResources) { |
| super(webSessionResources); |
| } |
| |
| /** |
| * For anonymous WebUser after each query request is completed the {@link WebSessionResources} is cleaned up. |
| */ |
| @Override |
| public void cleanupSession() { |
| webSessionResources.close(); |
| } |
| } |
| |
| /** |
| * Sets an autolimit on the size of records to be sent back on the connection |
| * @param autoLimitRowCount Max number of records to be sent back to WebServer |
| */ |
| void setAutoLimitRowCount(int autoLimitRowCount) { |
| this.autoLimitRowCount = autoLimitRowCount; |
| } |
| |
| /** |
| * Gets the max size of records to be sent back by the query |
| * @return Max number of records to be sent back to WebServer |
| */ |
| public int getAutoLimitRowCount() { |
| return this.autoLimitRowCount; |
| } |
| } |