001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.rest;
019
020import java.io.IOException;
021import java.util.Base64;
022import java.util.Base64.Decoder;
023import org.apache.hadoop.hbase.Cell;
024import org.apache.hadoop.hbase.CellUtil;
025import org.apache.hadoop.hbase.filter.Filter;
026import org.apache.hadoop.hbase.filter.ParseFilter;
027import org.apache.hadoop.hbase.rest.model.CellModel;
028import org.apache.hadoop.hbase.rest.model.CellSetModel;
029import org.apache.hadoop.hbase.rest.model.RowModel;
030import org.apache.hadoop.hbase.util.Bytes;
031import org.apache.yetus.audience.InterfaceAudience;
032import org.slf4j.Logger;
033import org.slf4j.LoggerFactory;
034
035import org.apache.hbase.thirdparty.javax.ws.rs.Encoded;
036import org.apache.hbase.thirdparty.javax.ws.rs.GET;
037import org.apache.hbase.thirdparty.javax.ws.rs.HeaderParam;
038import org.apache.hbase.thirdparty.javax.ws.rs.Produces;
039import org.apache.hbase.thirdparty.javax.ws.rs.QueryParam;
040import org.apache.hbase.thirdparty.javax.ws.rs.core.Context;
041import org.apache.hbase.thirdparty.javax.ws.rs.core.MultivaluedMap;
042import org.apache.hbase.thirdparty.javax.ws.rs.core.Response;
043import org.apache.hbase.thirdparty.javax.ws.rs.core.UriInfo;
044
045@InterfaceAudience.Private
046public class MultiRowResource extends ResourceBase implements Constants {
047  private static final Logger LOG = LoggerFactory.getLogger(MultiRowResource.class);
048
049  private static final Decoder base64Urldecoder = Base64.getUrlDecoder();
050
051  TableResource tableResource;
052  Integer versions = null;
053  String[] columns = null;
054
055  /**
056   * Constructor
057   */
058  public MultiRowResource(TableResource tableResource, String versions, String columnsStr)
059    throws IOException {
060    super();
061    this.tableResource = tableResource;
062
063    if (columnsStr != null && !columnsStr.equals("")) {
064      this.columns = columnsStr.split(",");
065    }
066
067    if (versions != null) {
068      this.versions = Integer.valueOf(versions);
069
070    }
071  }
072
073  @GET
074  @Produces({ MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF, MIMETYPE_PROTOBUF_IETF })
075  public Response get(final @Context UriInfo uriInfo,
076    final @HeaderParam("Encoding") String keyEncodingHeader,
077    @QueryParam(Constants.FILTER_B64) @Encoded String paramFilterB64,
078    @QueryParam(Constants.FILTER) String paramFilter) {
079    MultivaluedMap<String, String> params = uriInfo.getQueryParameters();
080    String keyEncoding = (keyEncodingHeader != null)
081      ? keyEncodingHeader
082      : params.getFirst(KEY_ENCODING_QUERY_PARAM_NAME);
083
084    servlet.getMetrics().incrementRequests(1);
085
086    byte[] filterBytes = null;
087    if (paramFilterB64 != null) {
088      filterBytes = base64Urldecoder.decode(paramFilterB64);
089    } else if (paramFilter != null) {
090      filterBytes = paramFilter.getBytes();
091    }
092
093    try {
094      Filter parsedParamFilter = null;
095      if (filterBytes != null) {
096        // Note that this is a completely different representation of the filters
097        // than the JSON one used in the /table/scanner endpoint
098        ParseFilter pf = new ParseFilter();
099        parsedParamFilter = pf.parseFilterString(filterBytes);
100      }
101      CellSetModel model = new CellSetModel();
102      // TODO map this to a Table.get(List<Get> gets) call instead of multiple get calls
103      for (String rk : params.get(ROW_KEYS_PARAM_NAME)) {
104        RowSpec rowSpec = new RowSpec(rk, keyEncoding);
105
106        if (this.versions != null) {
107          rowSpec.setMaxVersions(this.versions);
108        }
109
110        if (this.columns != null) {
111          for (int i = 0; i < this.columns.length; i++) {
112            rowSpec.addColumn(Bytes.toBytes(this.columns[i]));
113          }
114        }
115
116        ResultGenerator generator = ResultGenerator.fromRowSpec(this.tableResource.getName(),
117          rowSpec, parsedParamFilter, !params.containsKey(NOCACHE_PARAM_NAME));
118        Cell value = null;
119        RowModel rowModel = new RowModel(rowSpec.getRow());
120        if (generator.hasNext()) {
121          while ((value = generator.next()) != null) {
122            rowModel.addCell(new CellModel(CellUtil.cloneFamily(value),
123              CellUtil.cloneQualifier(value), value.getTimestamp(), CellUtil.cloneValue(value)));
124          }
125          model.addRow(rowModel);
126        } else {
127          if (LOG.isTraceEnabled()) {
128            LOG.trace("The row : " + rk + " not found in the table.");
129          }
130        }
131      }
132
133      if (model.getRows().isEmpty()) {
134        // If no rows found.
135        servlet.getMetrics().incrementFailedGetRequests(1);
136        return Response.status(Response.Status.NOT_FOUND).type(MIMETYPE_TEXT)
137          .entity("No rows found." + CRLF).build();
138      } else {
139        servlet.getMetrics().incrementSucessfulGetRequests(1);
140        return Response.ok(model).build();
141      }
142    } catch (IOException e) {
143      servlet.getMetrics().incrementFailedGetRequests(1);
144      return processException(e);
145    }
146  }
147}