Source code

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 javax.servlet.ServletContext;
022import org.apache.hadoop.hbase.HTableDescriptor;
023import org.apache.hadoop.hbase.NamespaceDescriptor;
024import org.apache.hadoop.hbase.client.Admin;
025import org.apache.hadoop.hbase.rest.model.NamespacesInstanceModel;
026import org.apache.hadoop.hbase.rest.model.TableListModel;
027import org.apache.hadoop.hbase.rest.model.TableModel;
028import org.apache.yetus.audience.InterfaceAudience;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032import org.apache.hbase.thirdparty.javax.ws.rs.Consumes;
033import org.apache.hbase.thirdparty.javax.ws.rs.DELETE;
034import org.apache.hbase.thirdparty.javax.ws.rs.GET;
035import org.apache.hbase.thirdparty.javax.ws.rs.POST;
036import org.apache.hbase.thirdparty.javax.ws.rs.PUT;
037import org.apache.hbase.thirdparty.javax.ws.rs.Path;
038import org.apache.hbase.thirdparty.javax.ws.rs.PathParam;
039import org.apache.hbase.thirdparty.javax.ws.rs.Produces;
040import org.apache.hbase.thirdparty.javax.ws.rs.core.Context;
041import org.apache.hbase.thirdparty.javax.ws.rs.core.HttpHeaders;
042import org.apache.hbase.thirdparty.javax.ws.rs.core.Response;
043import org.apache.hbase.thirdparty.javax.ws.rs.core.UriInfo;
044
045/**
046 * Implements the following REST end points:
047 * <p>
048 * <tt>/namespaces/{namespace} GET: get namespace properties.</tt>
049 * <tt>/namespaces/{namespace} POST: create namespace.</tt>
050 * <tt>/namespaces/{namespace} PUT: alter namespace.</tt>
051 * <tt>/namespaces/{namespace} DELETE: drop namespace.</tt>
052 * <tt>/namespaces/{namespace}/tables GET: list namespace's tables.</tt>
053 * <p>
054 */
055@InterfaceAudience.Private
056public class NamespacesInstanceResource extends ResourceBase {
057
058  private static final Logger LOG = LoggerFactory.getLogger(NamespacesInstanceResource.class);
059  String namespace;
060  boolean queryTables = false;
061
062  /**
063   * Constructor for standard NamespaceInstanceResource. n
064   */
065  public NamespacesInstanceResource(String namespace) throws IOException {
066    this(namespace, false);
067  }
068
069  /**
070   * Constructor for querying namespace table list via NamespaceInstanceResource. n
071   */
072  public NamespacesInstanceResource(String namespace, boolean queryTables) throws IOException {
073    super();
074    this.namespace = namespace;
075    this.queryTables = queryTables;
076  }
077
078  /**
079   * Build a response for GET namespace description or GET list of namespace tables.
080   * @param context servlet context
081   * @param uriInfo (JAX-RS context variable) request URL
082   * @return A response containing NamespacesInstanceModel for a namespace descriptions and
083   *         TableListModel for a list of namespace tables.
084   */
085  @GET
086  @Produces({ MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
087    MIMETYPE_PROTOBUF_IETF })
088  public Response get(final @Context ServletContext context, final @Context UriInfo uriInfo) {
089    if (LOG.isTraceEnabled()) {
090      LOG.trace("GET " + uriInfo.getAbsolutePath());
091    }
092    servlet.getMetrics().incrementRequests(1);
093
094    // Respond to list of namespace tables requests.
095    if (queryTables) {
096      TableListModel tableModel = new TableListModel();
097      try {
098        HTableDescriptor[] tables = servlet.getAdmin().listTableDescriptorsByNamespace(namespace);
099        for (int i = 0; i < tables.length; i++) {
100          tableModel.add(new TableModel(tables[i].getTableName().getQualifierAsString()));
101        }
102
103        servlet.getMetrics().incrementSucessfulGetRequests(1);
104        return Response.ok(tableModel).build();
105      } catch (IOException e) {
106        servlet.getMetrics().incrementFailedGetRequests(1);
107        throw new RuntimeException("Cannot retrieve table list for '" + namespace + "'.");
108      }
109    }
110
111    // Respond to namespace description requests.
112    try {
113      NamespacesInstanceModel rowModel = new NamespacesInstanceModel(servlet.getAdmin(), namespace);
114      servlet.getMetrics().incrementSucessfulGetRequests(1);
115      return Response.ok(rowModel).build();
116    } catch (IOException e) {
117      servlet.getMetrics().incrementFailedGetRequests(1);
118      throw new RuntimeException("Cannot retrieve info for '" + namespace + "'.");
119    }
120  }
121
122  /**
123   * Build a response for PUT alter namespace with properties specified.
124   * @param model   properties used for alter.
125   * @param uriInfo (JAX-RS context variable) request URL
126   * @return response code.
127   */
128  @PUT
129  @Consumes({ MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF, MIMETYPE_PROTOBUF_IETF })
130  public Response put(final NamespacesInstanceModel model, final @Context UriInfo uriInfo) {
131    return processUpdate(model, true, uriInfo);
132  }
133
134  /**
135   * Build a response for POST create namespace with properties specified.
136   * @param model   properties used for create.
137   * @param uriInfo (JAX-RS context variable) request URL
138   * @return response code.
139   */
140  @POST
141  @Consumes({ MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF, MIMETYPE_PROTOBUF_IETF })
142  public Response post(final NamespacesInstanceModel model, final @Context UriInfo uriInfo) {
143    return processUpdate(model, false, uriInfo);
144  }
145
146  // Check that POST or PUT is valid and then update namespace.
147  private Response processUpdate(NamespacesInstanceModel model, final boolean updateExisting,
148    final UriInfo uriInfo) {
149    if (LOG.isTraceEnabled()) {
150      LOG.trace((updateExisting ? "PUT " : "POST ") + uriInfo.getAbsolutePath());
151    }
152    if (model == null) {
153      try {
154        model = new NamespacesInstanceModel(namespace);
155      } catch (IOException ioe) {
156        servlet.getMetrics().incrementFailedPutRequests(1);
157        throw new RuntimeException("Cannot retrieve info for '" + namespace + "'.");
158      }
159    }
160    servlet.getMetrics().incrementRequests(1);
161
162    if (servlet.isReadOnly()) {
163      servlet.getMetrics().incrementFailedPutRequests(1);
164      return Response.status(Response.Status.FORBIDDEN).type(MIMETYPE_TEXT)
165        .entity("Forbidden" + CRLF).build();
166    }
167
168    Admin admin = null;
169    boolean namespaceExists = false;
170    try {
171      admin = servlet.getAdmin();
172      namespaceExists = doesNamespaceExist(admin, namespace);
173    } catch (IOException e) {
174      servlet.getMetrics().incrementFailedPutRequests(1);
175      return processException(e);
176    }
177
178    // Do not allow creation if namespace already exists.
179    if (!updateExisting && namespaceExists) {
180      servlet.getMetrics().incrementFailedPutRequests(1);
181      return Response.status(Response.Status.FORBIDDEN).type(MIMETYPE_TEXT).entity("Namespace '"
182        + namespace + "' already exists.  Use REST PUT " + "to alter the existing namespace.")
183        .build();
184    }
185
186    // Do not allow altering if namespace does not exist.
187    if (updateExisting && !namespaceExists) {
188      servlet.getMetrics().incrementFailedPutRequests(1);
189      return Response.status(Response.Status.FORBIDDEN).type(MIMETYPE_TEXT).entity(
190        "Namespace '" + namespace + "' does not exist. Use " + "REST POST to create the namespace.")
191        .build();
192    }
193
194    return createOrUpdate(model, uriInfo, admin, updateExisting);
195  }
196
197  // Do the actual namespace create or alter.
198  private Response createOrUpdate(final NamespacesInstanceModel model, final UriInfo uriInfo,
199    final Admin admin, final boolean updateExisting) {
200    NamespaceDescriptor.Builder builder = NamespaceDescriptor.create(namespace);
201    builder.addConfiguration(model.getProperties());
202    if (model.getProperties().size() > 0) {
203      builder.addConfiguration(model.getProperties());
204    }
205    NamespaceDescriptor nsd = builder.build();
206
207    try {
208      if (updateExisting) {
209        admin.modifyNamespace(nsd);
210      } else {
211        admin.createNamespace(nsd);
212      }
213    } catch (IOException e) {
214      servlet.getMetrics().incrementFailedPutRequests(1);
215      return processException(e);
216    }
217
218    servlet.getMetrics().incrementSucessfulPutRequests(1);
219
220    return updateExisting
221      ? Response.ok(uriInfo.getAbsolutePath()).build()
222      : Response.created(uriInfo.getAbsolutePath()).build();
223  }
224
225  private boolean doesNamespaceExist(Admin admin, String namespaceName) throws IOException {
226    NamespaceDescriptor[] nd = admin.listNamespaceDescriptors();
227    for (int i = 0; i < nd.length; i++) {
228      if (nd[i].getName().equals(namespaceName)) {
229        return true;
230      }
231    }
232    return false;
233  }
234
235  /**
236   * Build a response for DELETE delete namespace.
237   * @param message value not used.
238   * @param headers value not used.
239   * @return response code.
240   */
241  @DELETE
242  public Response deleteNoBody(final byte[] message, final @Context UriInfo uriInfo,
243    final @Context HttpHeaders headers) {
244    if (LOG.isTraceEnabled()) {
245      LOG.trace("DELETE " + uriInfo.getAbsolutePath());
246    }
247    if (servlet.isReadOnly()) {
248      servlet.getMetrics().incrementFailedDeleteRequests(1);
249      return Response.status(Response.Status.FORBIDDEN).type(MIMETYPE_TEXT)
250        .entity("Forbidden" + CRLF).build();
251    }
252
253    try {
254      Admin admin = servlet.getAdmin();
255      if (!doesNamespaceExist(admin, namespace)) {
256        return Response.status(Response.Status.NOT_FOUND).type(MIMETYPE_TEXT)
257          .entity("Namespace '" + namespace + "' does not exists.  Cannot " + "drop namespace.")
258          .build();
259      }
260
261      admin.deleteNamespace(namespace);
262      servlet.getMetrics().incrementSucessfulDeleteRequests(1);
263      return Response.ok().build();
264
265    } catch (IOException e) {
266      servlet.getMetrics().incrementFailedDeleteRequests(1);
267      return processException(e);
268    }
269  }
270
271  /**
272   * Dispatch to NamespaceInstanceResource for getting list of tables.
273   */
274  @Path("tables")
275  public NamespacesInstanceResource
276    getNamespaceInstanceResource(final @PathParam("tables") String namespace) throws IOException {
277    return new NamespacesInstanceResource(this.namespace, true);
278  }
279}