| /* |
| * 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.knox.gateway.shell; |
| |
| import groovy.lang.Closure; |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.http.HttpRequest; |
| import org.apache.http.NameValuePair; |
| import org.apache.http.client.methods.CloseableHttpResponse; |
| import org.apache.http.client.utils.URIBuilder; |
| import org.apache.http.message.BasicNameValuePair; |
| |
| import java.io.IOException; |
| import java.net.URISyntaxException; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.Future; |
| |
| public abstract class AbstractRequest<T> { |
| private static final String PARAMETER_NAME_DOAS = "doAs"; |
| |
| private final KnoxSession session; |
| |
| private final String doAsUser; |
| |
| protected AbstractRequest( KnoxSession session ) { |
| this(session, null); |
| } |
| |
| protected AbstractRequest( KnoxSession session, String doAsUser ) { |
| this.session = session; |
| this.doAsUser = doAsUser; |
| } |
| |
| protected KnoxSession hadoop() { |
| return session; |
| } |
| |
| protected CloseableHttpResponse execute(HttpRequest request ) throws IOException { |
| addHeaders(request, session.getHeaders()); |
| return session.executeNow( request ); |
| } |
| |
| private void addHeaders(HttpRequest request, Map<String, String> headers) { |
| for(Entry<String, String> header : headers.entrySet()) { |
| request.setHeader(header.getKey(), header.getValue()); |
| } |
| } |
| |
| protected URIBuilder uri( String... parts ) throws URISyntaxException { |
| URIBuilder builder = new URIBuilder(session.base() + StringUtils.join(parts)); |
| |
| if(StringUtils.isNotEmpty(doAsUser)) { |
| builder.addParameter(PARAMETER_NAME_DOAS, doAsUser); |
| } |
| |
| return builder; |
| } |
| |
| protected void addQueryParam( URIBuilder uri, String name, Object value ) { |
| if( value != null ) { |
| uri.addParameter( name, value.toString() ); |
| } |
| } |
| |
| protected void addParam( List<NameValuePair> list, String name, String value ) { |
| if( value != null ) { |
| list.add( new BasicNameValuePair( name, value ) ); |
| } |
| } |
| |
| protected abstract Callable<T> callable(); |
| |
| public KnoxSession getSession() { |
| return session; |
| } |
| |
| public T now() throws KnoxShellException { |
| try { |
| return callable().call(); |
| } catch( Exception e ) { |
| throw new KnoxShellException( e ); |
| } |
| } |
| |
| public Future<T> later() { |
| return hadoop().executeLater( callable() ); |
| } |
| |
| public Future<T> later( final Closure<Void> closure ) { |
| return hadoop().executeLater( new Callable<T>() { |
| @Override |
| public T call() throws Exception { |
| T result = callable().call(); |
| closure.call( result ); |
| return result; |
| } |
| } ); |
| } |
| |
| public String getDoAsUser() { |
| return doAsUser; |
| } |
| } |