io.fabric8.elasticsearch.plugin.acl.ConfigurationLoader Maven / Gradle / Ivy

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/**
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * Licensed 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.
 */

/*
 * Copyright 2015 floragunn UG (haftungsbeschränkt)
 * 
 * Licensed 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 io.fabric8.elasticsearch.plugin.acl;

import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.get.MultiGetItemResponse;
import org.elasticsearch.action.get.MultiGetRequest;
import org.elasticsearch.action.get.MultiGetResponse;
import org.elasticsearch.action.get.MultiGetResponse.Failure;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.settings.loader.JsonSettingsLoader;
import org.elasticsearch.common.util.concurrent.ThreadContext;
import org.elasticsearch.common.util.concurrent.ThreadContext.StoredContext;
import org.elasticsearch.common.xcontent.NamedXContentRegistry;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.threadpool.ThreadPool;

import com.floragunn.searchguard.support.ConfigConstants;

/*
 * HACK: Copy of SG ConfigurationLoader to make use of ConfigurationLoader 
 */
public class ConfigurationLoader {

    protected final Logger log = LogManager.getLogger(this.getClass());
    private final Client client;
    private final ThreadContext threadContext;
    private final String searchguardIndex;
    
    public ConfigurationLoader(final Client client, ThreadPool threadPool, final Settings settings) {
        super();
        this.client = client;
        this.threadContext = threadPool.getThreadContext();
        this.searchguardIndex = settings.get(ConfigConstants.SG_CONFIG_INDEX, ConfigConstants.SG_DEFAULT_CONFIG_INDEX);
        log.debug("Index is: {}", searchguardIndex);
    }
    
    public Map> load(final String[] events, long timeout, TimeUnit timeUnit) throws InterruptedException, TimeoutException {
        final CountDownLatch latch = new CountDownLatch(events.length);
        final Map> rs = new HashMap<>(events.length);
        
        loadAsync(events, new ConfigCallback() {
            
            @Override
            public void success(String type, Settings settings, Long version) {
                if(latch.getCount() <= 0) {
                    log.error("Latch already counted down (for {} of {})  (index={})", type, Arrays.toString(events), searchguardIndex);
                }
                
                rs.put(type, new Tuple(settings, version));
                latch.countDown();
                if(log.isDebugEnabled()) {
                    log.debug("Received config for {} (of {}) with current latch value={}", type, Arrays.toString(events), latch.getCount());
                }
            }
            
            @Override
            public void singleFailure(Failure failure) {
                log.error("Failure {} retrieving configuration for {} (index={})", failure == null ? null : failure.getMessage(), Arrays.toString(events), searchguardIndex);
            }
            
            @Override
            public void noData(String type) {
                log.error("No data for {} while retrieving configuration for {}  (index={})", type, Arrays.toString(events), searchguardIndex);
            }
            
            @Override
            public void failure(Throwable t) {
                log.error("Exception {} while retrieving configuration for {}  (index={})",t,t.toString(), Arrays.toString(events), searchguardIndex);
            }
        });
        
        if(!latch.await(timeout, timeUnit)) {
            //timeout
            throw new TimeoutException("Timeout after " + timeout + "" + timeUnit 
                    + " while retrieving configuration for " + Arrays.toString(events) + "(index=" + searchguardIndex + ")");
        }
        
        return rs;
    }
    
    public void loadAsync(final String[] events, final ConfigCallback callback) {        
        if(events == null || events.length == 0) {
            log.warn("No config events requested to load");
            return;
        }
        
        final MultiGetRequest mget = new MultiGetRequest();

        for (int i = 0; i < events.length; i++) {
            final String event = events[i];
            mget.add(searchguardIndex, event, "0");
        }
        
        mget.refresh(true);
        mget.realtime(true);
        
        try (StoredContext ctx = threadContext.stashContext()) {
            threadContext.putHeader(ConfigConstants.SG_CONF_REQUEST_HEADER, "true");
        
            client.multiGet(mget, new ActionListener() {
                @Override
                public void onResponse(MultiGetResponse response) {
                    MultiGetItemResponse[] responses = response.getResponses();
                    for (int i = 0; i < responses.length; i++) {
                        MultiGetItemResponse singleResponse = responses[i];
                        if(singleResponse != null && !singleResponse.isFailed()) {
                            GetResponse singleGetResponse = singleResponse.getResponse();
                            if(singleGetResponse.isExists() && !singleGetResponse.isSourceEmpty()) {
                                //success
                                Long version = singleGetResponse.getVersion();
                                final Settings _settings = toSettings(singleGetResponse.getSourceAsBytesRef(), singleGetResponse.getType());
                                if(_settings != null) {
                                    callback.success(singleGetResponse.getType(), _settings, version);
                                } else {
                                    log.error("Cannot parse settings for " + singleGetResponse.getType());
                                }
                            } else {
                                //does not exist or empty source
                                callback.noData(singleGetResponse.getType());
                            }
                        } else {
                            //failure
                            callback.singleFailure(singleResponse == null ? null : singleResponse.getFailure());
                        }
                    }
                }           
                
                @Override
                public void onFailure(Exception e) {
                    callback.failure(e);
                }
            });
        }
    }

    private Settings toSettings(final BytesReference ref, final String type) {
        if (ref == null || ref.length() == 0) {
            return null;
        }
        
        XContentParser parser = null;

        try {
            parser = XContentHelper.createParser(NamedXContentRegistry.EMPTY, ref, XContentType.JSON);
            parser.nextToken();
            parser.nextToken();
         
            if(!type.equals((parser.currentName()))) {
                return null;
            }
            
            parser.nextToken();
            
            return Settings.builder().put(new JsonSettingsLoader(true).load(parser.binaryValue())).build();
        } catch (final IOException e) {
            throw ExceptionsHelper.convertToElastic(e);
        } finally {
            if(parser != null) {
                parser.close();
            }
        }
    }
}