org.apache.slider.server.appmaster.web.rest.AbstractSliderResource.java Source code

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Here is the source code for org.apache.slider.server.appmaster.web.rest.AbstractSliderResource.java

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/*
 * 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;

import org.apache.hadoop.fs.PathNotFoundException;
import org.apache.hadoop.registry.client.exceptions.AuthenticationFailedException;
import org.apache.hadoop.registry.client.exceptions.NoPathPermissionsException;
import org.apache.hadoop.yarn.webapp.ForbiddenException;
import org.apache.hadoop.yarn.webapp.NotFoundException;
import org.apache.slider.server.appmaster.management.MetricsAndMonitoring;
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.WebApplicationException;
import javax.ws.rs.core.Response;
import java.io.FileNotFoundException;
import java.net.URI;
import java.net.URL;

/**
 * Abstract resource base class for REST resources
 * that use the slider WebAppApi
 */
public abstract class AbstractSliderResource {
    private static final Logger log = LoggerFactory.getLogger(AbstractSliderResource.class);
    protected final WebAppApi slider;
    protected final MetricsAndMonitoring metricsAndMonitoring;

    protected AbstractSliderResource(WebAppApi slider) {
        this.slider = slider;
        metricsAndMonitoring = slider.getMetricsAndMonitoring();
    }

    /**
     * Generate a redirect to the WASL
     * @param request to base the URL on
     * @return a 302 response
     */
    protected Response redirectToAppWadl(HttpServletRequest request) {
        try {
            URI location = new URL(request.getScheme(), request.getServerName(), request.getServerPort(),
                    RestPaths.APPLICATION_WADL).toURI();
            return Response.temporaryRedirect(location).build();
        } catch (Exception e) {
            log.error("Error during redirect to WADL", e);
            throw new WebApplicationException(Response.serverError().build());
        }
    }

    /**
     * Convert any exception caught into a web application
     * exception for rethrowing
     * @param path path of request
     * @param ex exception
     * @return an exception to throw
     */
    public WebApplicationException buildException(String path, Exception ex) {
        try {
            throw ex;
        } catch (WebApplicationException e) {
            // rethrow direct
            throw e;
        } catch (FileNotFoundException e) {
            return new NotFoundException("Not found: " + path);
        } catch (PathNotFoundException e) {
            return new NotFoundException("Not found: " + path);
        } catch (AuthenticationFailedException e) {
            return new ForbiddenException(path);
        } catch (NoPathPermissionsException e) {
            return new ForbiddenException(path);
        } catch (Exception e) {
            log.error("Error during generation of response: {}", e, e);
            return new WebApplicationException(e);
        }
    }

    /**
     * Mark an GET operation on a path
     * @param verb HTTP Verb
     * @param path path relative to slider API
     */
    protected void mark(String verb, String path) {
        metricsAndMonitoring.markMeterAndCounter(verb + "-" + path);
    }

    /**
     * Mark an GET operation on a path
     * @param verb HTTP Verb
     * @param path path relative to slider API
     */
    protected void mark(String verb, String path, String subpath) {
        metricsAndMonitoring.markMeterAndCounter(verb + "-" + path + subpath);
    }

    /**
     * Mark a GET operation on a path
     * @param path path relative to slider API
     */
    protected void markGet(String path) {
        mark("GET", path);
    }

    /**
     * Mark a GET operation on a path
     * @param path path relative to slider API
     */
    protected void markGet(String path, String subpath) {
        mark("GET", path, subpath);
    }

    /**
     * Mark a GET operation on a path
     * @param path path relative to slider API
     */
    protected void markPost(String path, String subpath) {
        mark("POST", path, subpath);
    }

    /**
     * Mark a GET operation on a path
     * @param path path relative to slider API
     */
    protected void markPut(String path, String subpath) {
        mark("PUT", path, subpath);
    }

    /**
     * Mark a GET operation on a path
     * @param path path relative to slider API
     */
    protected void markDelete(String path, String subpath) {
        mark("DELETE", path, subpath);
    }

}