| /* |
| * 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.slider.server.appmaster.web.rest.registry; |
| |
| import com.google.inject.Singleton; |
| import org.apache.hadoop.fs.PathNotFoundException; |
| import org.apache.hadoop.registry.client.api.RegistryOperations; |
| import org.apache.hadoop.registry.client.exceptions.AuthenticationFailedException; |
| import org.apache.hadoop.registry.client.exceptions.InvalidRecordException; |
| import org.apache.hadoop.registry.client.exceptions.NoPathPermissionsException; |
| import org.apache.hadoop.registry.client.exceptions.NoRecordException; |
| import org.apache.hadoop.yarn.webapp.ForbiddenException; |
| import org.apache.hadoop.yarn.webapp.NotFoundException; |
| import org.apache.slider.server.appmaster.web.WebAppApi; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.servlet.http.HttpServletRequest; |
| import javax.ws.rs.GET; |
| import javax.ws.rs.Path; |
| import javax.ws.rs.PathParam; |
| import javax.ws.rs.Produces; |
| import javax.ws.rs.WebApplicationException; |
| import javax.ws.rs.core.Context; |
| import javax.ws.rs.core.MediaType; |
| import javax.ws.rs.core.UriInfo; |
| import java.io.IOException; |
| |
| /** |
| * This is the read-only view of the YARN registry. |
| * |
| * Model: |
| * <ol> |
| * <li>a tree of nodes</li> |
| * <li>Default view is of children + record</li> |
| * </ol> |
| * |
| */ |
| @Singleton |
| public class RegistryResource { |
| protected static final Logger log = |
| LoggerFactory.getLogger(RegistryResource.class); |
| public static final String SERVICE_PATH = |
| "/{path:.*}"; |
| |
| private final RegistryOperations registry; |
| |
| /** |
| * Construct an instance bonded to a registry |
| * @param slider slider API |
| */ |
| public RegistryResource(WebAppApi slider) { |
| this.registry = slider.getRegistryOperations(); |
| } |
| |
| /** |
| * Internal init code, per request |
| * @param request incoming request |
| * @param uriInfo URI details |
| */ |
| private void init(HttpServletRequest request, UriInfo uriInfo) { |
| log.debug(uriInfo.getRequestUri().toString()); |
| } |
| |
| @GET |
| @Produces({MediaType.APPLICATION_JSON}) |
| public PathEntryResource getRoot(@Context HttpServletRequest request, |
| @Context UriInfo uriInfo) { |
| return lookup("/", request, uriInfo); |
| } |
| |
| // {path:.*} |
| |
| @Path(SERVICE_PATH) |
| @GET |
| @Produces({MediaType.APPLICATION_JSON}) |
| public PathEntryResource lookup( |
| @PathParam("path") String path, |
| @Context HttpServletRequest request, |
| @Context UriInfo uriInfo) { |
| init(request, uriInfo); |
| return resolvePath(path); |
| } |
| |
| /** |
| * Do the actual processing of requests to responses; can be directly |
| * invoked for testing. |
| * @param path path to query |
| * @return the entry |
| * @throws WebApplicationException on any failure. |
| */ |
| public PathEntryResource resolvePath(String path) throws |
| WebApplicationException { |
| try { |
| PathEntryResource pathEntry = |
| fromRegistry(path); |
| if (log.isDebugEnabled()) { |
| log.debug("Resolved:\n{}", pathEntry); |
| } |
| return pathEntry; |
| } catch (WebApplicationException e) { |
| // rethrow direct |
| throw e; |
| } catch (PathNotFoundException e) { |
| throw new NotFoundException("Not found: " + path); |
| } catch (AuthenticationFailedException e) { |
| throw new ForbiddenException(path); |
| } catch (NoPathPermissionsException e) { |
| throw new ForbiddenException(path); |
| } catch (Exception e) { |
| log.error("Error during generation of response: {}", e, e); |
| throw new WebApplicationException(e); |
| } |
| } |
| |
| |
| /** |
| * Build from the registry, filling up the children and service records. |
| * If there is no service record at the end of the path, that entry is |
| * null |
| * @param path path to query |
| * @return the built up record |
| * @throws IOException problems |
| * |
| */ |
| private PathEntryResource fromRegistry(String path) throws IOException { |
| PathEntryResource entry = new PathEntryResource(); |
| try { |
| entry.service = registry.resolve(path); |
| } catch (NoRecordException e) { |
| // ignoring |
| log.debug("No record at {}", path); |
| } catch (InvalidRecordException e) { |
| // swallowing this exception, the sign of "no entry present" |
| // "nothing parseable" |
| log.warn("Failed to resolve {}: {}", path, e, e); |
| } |
| entry.nodes = registry.list(path); |
| return entry; |
| } |
| } |