c3.ops.priam.resources.BackupServlet.java Source code

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/**
 * Copyright 2013 Netflix, 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.
 */
package c3.ops.priam.resources;

import c3.ops.priam.ICassandraProcess;
import c3.ops.priam.IConfiguration;
import c3.ops.priam.PriamServer;
import c3.ops.priam.backup.*;
import c3.ops.priam.backup.AbstractBackupPath.BackupFileType;
import c3.ops.priam.identity.IPriamInstanceFactory;
import c3.ops.priam.identity.PriamInstance;
import c3.ops.priam.scheduler.PriamScheduler;
import c3.ops.priam.utils.CassandraMonitor;
import c3.ops.priam.utils.CassandraTuner;
import c3.ops.priam.utils.ITokenManager;
import c3.ops.priam.utils.SystemUtils;
import com.google.common.collect.Lists;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.name.Named;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.codehaus.jettison.json.JSONArray;
import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.io.File;
import java.io.IOException;
import java.math.BigInteger;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.*;

@Path("/v1/backup")
@Produces(MediaType.APPLICATION_JSON)
public class BackupServlet {
    private static final Logger logger = LoggerFactory.getLogger(BackupServlet.class);

    private static final String REST_SUCCESS = "[\"ok\"]";
    private static final String REST_HEADER_RANGE = "daterange";
    private static final String REST_HEADER_FILTER = "filter";
    private static final String REST_HEADER_TOKEN = "token";
    private static final String REST_HEADER_REGION = "region";
    private static final String REST_KEYSPACES = "keyspaces";
    private static final String REST_RESTORE_PREFIX = "restoreprefix";
    private static final String FMT = "yyyyMMddHHmm";
    private static final String REST_LOCR_ROWKEY = "verifyrowkey";
    private static final String REST_LOCR_KEYSPACE = "verifyks";
    private static final String REST_LOCR_COLUMNFAMILY = "verifycf";
    private static final String REST_LOCR_FILEEXTENSION = "verifyfileextension";
    private static final String SSTABLE2JSON_DIR_LOCATION = "/tmp/priam_sstables";
    private static final String SSTABLE2JSON_COMMAND_FROM_CASSHOME = "/bin/sstable2json";
    private final ITokenManager tokenManager;
    private final ICassandraProcess cassProcess;
    private PriamServer priamServer;
    private IConfiguration config;
    private IBackupFileSystem backupFs;
    private IBackupFileSystem bkpStatusFs;
    private Restore restoreObj;
    private Provider<AbstractBackupPath> pathProvider;
    private CassandraTuner tuner;
    private SnapshotBackup snapshotBackup;
    private IPriamInstanceFactory factory;
    @Inject
    private PriamScheduler scheduler;
    @Inject
    private MetaData metaData;

    @Inject

    public BackupServlet(PriamServer priamServer, IConfiguration config,
            @Named("backup") IBackupFileSystem backupFs, @Named("backup_status") IBackupFileSystem bkpStatusFs,
            Restore restoreObj, Provider<AbstractBackupPath> pathProvider, CassandraTuner tuner,
            SnapshotBackup snapshotBackup, IPriamInstanceFactory factory, ITokenManager tokenManager,
            ICassandraProcess cassProcess)

    {
        this.priamServer = priamServer;
        this.config = config;
        this.backupFs = backupFs;
        this.bkpStatusFs = bkpStatusFs;
        this.restoreObj = restoreObj;
        this.pathProvider = pathProvider;
        this.tuner = tuner;
        this.snapshotBackup = snapshotBackup;
        this.factory = factory;
        this.tokenManager = tokenManager;
        this.cassProcess = cassProcess;
    }

    @GET
    @Path("/do_snapshot")
    public Response backup() throws Exception {
        snapshotBackup.execute();
        return Response.ok(REST_SUCCESS, MediaType.APPLICATION_JSON).build();
    }

    @GET
    @Path("/incremental_backup")
    public Response backupIncrementals() throws Exception {
        scheduler.addTask("IncrementalBackup", IncrementalBackup.class, IncrementalBackup.getTimer());
        return Response.ok(REST_SUCCESS, MediaType.APPLICATION_JSON).build();
    }

    @GET
    @Path("/restore")
    public Response restore(@QueryParam(REST_HEADER_RANGE) String daterange,
            @QueryParam(REST_HEADER_REGION) String region, @QueryParam(REST_HEADER_TOKEN) String token,
            @QueryParam(REST_KEYSPACES) String keyspaces, @QueryParam(REST_RESTORE_PREFIX) String restorePrefix)
            throws Exception {
        Date startTime;
        Date endTime;

        if (StringUtils.isBlank(daterange) || daterange.equalsIgnoreCase("default")) {
            startTime = new DateTime().minusDays(1).toDate();
            endTime = new DateTime().toDate();
        } else {
            String[] restore = daterange.split(",");
            AbstractBackupPath path = pathProvider.get();
            startTime = path.parseDate(restore[0]);
            endTime = path.parseDate(restore[1]);
        }

        String origRestorePrefix = config.getRestorePrefix();
        if (StringUtils.isNotBlank(restorePrefix)) {
            config.setRestorePrefix(restorePrefix);
        }

        logger.info("Parameters: { token: [" + token + "], region: [" + region + "], startTime: [" + startTime
                + "], endTime: [" + endTime + "], keyspaces: [" + keyspaces + "], restorePrefix: [" + restorePrefix
                + "]}");

        restore(token, region, startTime, endTime, keyspaces);

        //Since this call is probably never called in parallel, config is multi-thread safe to be edited
        if (origRestorePrefix != null)
            config.setRestorePrefix(origRestorePrefix);
        else
            config.setRestorePrefix("");

        return Response.ok(REST_SUCCESS, MediaType.APPLICATION_JSON).build();
    }

    @GET
    @Path("/list")
    public Response list(@QueryParam(REST_HEADER_RANGE) String daterange,
            @QueryParam(REST_HEADER_FILTER) @DefaultValue("") String filter) throws Exception {
        Date startTime;
        Date endTime;

        if (StringUtils.isBlank(daterange) || daterange.equalsIgnoreCase("default")) {
            startTime = new DateTime().minusDays(1).toDate();
            endTime = new DateTime().toDate();
        } else {
            String[] restore = daterange.split(",");
            AbstractBackupPath path = pathProvider.get();
            startTime = path.parseDate(restore[0]);
            endTime = path.parseDate(restore[1]);
        }

        logger.info("Parameters: {backupPrefix: [" + config.getBackupPrefix() + "], daterange: [" + daterange
                + "], filter: [" + filter + "]}");

        Iterator<AbstractBackupPath> it = bkpStatusFs.list(config.getBackupPrefix(), startTime, endTime);
        JSONObject object = new JSONObject();
        object = constructJsonResponse(object, it, filter);
        return Response.ok(object.toString(2), MediaType.APPLICATION_JSON).build();
    }

    @GET
    @Path("/status")
    public Response status() throws Exception {
        int restoreTCount = restoreObj.getActiveCount();
        logger.debug("Thread counts for backup is: %d", restoreTCount);
        int backupTCount = backupFs.getActivecount();
        logger.debug("Thread counts for restore is: %d", backupTCount);
        JSONObject object = new JSONObject();
        object.put("Restore", new Integer(restoreTCount));
        object.put("Status", restoreObj.state().toString());
        object.put("Backup", new Integer(backupTCount));
        object.put("Status", snapshotBackup.state().toString());
        return Response.ok(object.toString(), MediaType.APPLICATION_JSON).build();
    }

    /**
     * <p/>
     * Life_Of_C*Row : With this REST call, mutations/existence of a rowkey can be found.
     * It uses SSTable2Json utility which will convert SSTables on disk to JSON format and
     * Search for the desired rowkey.
     * <p/>
     * Steps include:
     * 1. Restoring data for given data range and other params
     * 2. Searching provided rowkey in SSTables and writing search result to JSON
     * 3. Delete all the files under Keyspace Directory.
     * Deletion is done for efficient space usage, so that same node can be reused for
     * subsequent runs.
     * <p/>
     *
     * @param Similar to Restore call and few additional params.
     *                <p/>
     *                daterange       : Can not be Null or Default. Comma separated Start & End date eg. 201311250000,201311260000
     *                rowkey          : rowkey to search (In Hex format)
     *                ks              : keyspace of mentioned rowkey
     *                cf              : column family of mentioned rowkey
     *                fileExtension    : Part of SSTable Data file names
     *                eg. if file name = KS1-CF1-hf-100-Data.db
     *                then fileExtension = KS1-CF1-hf
     * @return Creates JSON file based on the passed date at hardcoded dir location : /tmp/priam_sstables
     * If rowkey is not found in the SSTable, JSON file will be empty.
     */
    @GET
    @Path("/life_of_crow")
    public Response restore_verify_key(@QueryParam(REST_HEADER_RANGE) String daterange,
            @QueryParam(REST_HEADER_REGION) String region, @QueryParam(REST_HEADER_TOKEN) String token,
            @QueryParam(REST_KEYSPACES) String keyspaces, @QueryParam(REST_RESTORE_PREFIX) String restorePrefix,
            @QueryParam(REST_LOCR_ROWKEY) String rowkey, @QueryParam(REST_LOCR_KEYSPACE) String ks,
            @QueryParam(REST_LOCR_COLUMNFAMILY) String cf,
            @QueryParam(REST_LOCR_FILEEXTENSION) String fileExtension) throws Exception {

        Date startTime;
        Date endTime;
        //Creating Dir for Json storage
        SystemUtils.createDirs(SSTABLE2JSON_DIR_LOCATION);
        String JSON_FILE_PATH = "";

        try {

            if (StringUtils.isBlank(daterange) || daterange.equalsIgnoreCase("default")) {
                return Response.ok("\n[\"daterange can't be blank or default.eg.201311250000,201311260000\"]\n",
                        MediaType.APPLICATION_JSON).build();
            }

            String[] restore = daterange.split(",");
            AbstractBackupPath path = pathProvider.get();
            startTime = path.parseDate(restore[0]);
            endTime = path.parseDate(restore[1]);

            String origRestorePrefix = config.getRestorePrefix();
            if (StringUtils.isNotBlank(restorePrefix)) {
                config.setRestorePrefix(restorePrefix);
            }

            restore(token, region, startTime, endTime, keyspaces);

            // Since this call is probably never called in parallel, config is
            // multi-thread safe to be edited
            config.setRestorePrefix(origRestorePrefix);

            while (!CassandraMonitor.isCassadraStarted())
                Thread.sleep(1000l);

            // initialize json file name
            JSON_FILE_PATH = daterange.split(",")[0].substring(0, 8) + ".json";

            //Convert SSTable2Json and search for given rowkey
            checkSSTablesForKey(rowkey, ks, cf, fileExtension, JSON_FILE_PATH);

        } catch (Exception e) {
            logger.info(ExceptionUtils.getStackTrace(e));
        } finally {
            removeAllDataFiles(ks);
        }

        return Response.ok(REST_SUCCESS, MediaType.APPLICATION_JSON).build();
    }

    /**
     * Restore with the specified start and end time.
     *
     * @param token     Overrides the current token with this one, if specified
     * @param region    Override the region for searching backup
     * @param startTime Start time
     * @param endTime   End time upto which the restore should fetch data
     * @param keyspaces Comma seperated list of keyspaces to restore
     * @throws Exception
     */
    private void restore(String token, String region, Date startTime, Date endTime, String keyspaces)
            throws Exception {
        String origRegion = config.getDC();
        String origToken = priamServer.getId().getInstance().getToken();
        if (StringUtils.isNotBlank(token))
            priamServer.getId().getInstance().setToken(token);

        if (config.isRestoreClosestToken())
            priamServer.getId().getInstance()
                    .setToken(closestToken(priamServer.getId().getInstance().getToken(), config.getDC()));

        if (StringUtils.isNotBlank(region)) {
            config.setDC(region);
            logger.info("Restoring from region " + region);
            priamServer.getId().getInstance()
                    .setToken(closestToken(priamServer.getId().getInstance().getToken(), region));
            logger.info("Restore will use token " + priamServer.getId().getInstance().getToken());
        }

        setRestoreKeyspaces(keyspaces);

        try {
            restoreObj.restore(startTime, endTime);
        } finally {
            config.setDC(origRegion);
            priamServer.getId().getInstance().setToken(origToken);
        }
        tuner.updateAutoBootstrap(config.getYamlLocation(), false);
        cassProcess.start(true);
    }

    /**
     * Find closest token in the specified region
     */
    private String closestToken(String token, String region) {
        List<PriamInstance> plist = factory.getAllIds(config.getAppName());
        List<BigInteger> tokenList = Lists.newArrayList();
        for (PriamInstance ins : plist) {
            if (ins.getDC().equalsIgnoreCase(region))
                tokenList.add(new BigInteger(ins.getToken()));
        }
        return tokenManager.findClosestToken(new BigInteger(token), tokenList).toString();
    }

    /*
     * TODO: decouple the servlet, config, and restorer. this should not rely on a side
     *       effect of a list mutation on the config object (treating it as global var).
     */
    private void setRestoreKeyspaces(String keyspaces) {
        if (StringUtils.isNotBlank(keyspaces)) {
            List<String> newKeyspaces = Lists.newArrayList(keyspaces.split(","));
            config.setRestoreKeySpaces(newKeyspaces);
        }
    }

    private JSONObject constructJsonResponse(JSONObject object, Iterator<AbstractBackupPath> it, String filter)
            throws Exception {
        int fileCnt = 0;
        filter = filter.contains("?") ? filter.substring(0, filter.indexOf("?")) : filter;

        try {
            JSONArray jArray = new JSONArray();
            while (it.hasNext()) {
                AbstractBackupPath p = it.next();
                if (!filter.isEmpty() && BackupFileType.valueOf(filter) != p.getType())
                    continue;
                JSONObject backupJSON = new JSONObject();
                backupJSON.put("bucket", config.getBackupPrefix());
                backupJSON.put("filename", p.getRemotePath());
                backupJSON.put("app", p.getClusterName());
                backupJSON.put("region", p.getRegion());
                backupJSON.put("token", p.getToken());
                backupJSON.put("ts", new DateTime(p.getTime()).toString(FMT));
                backupJSON.put("instance_id", p.getInstanceIdentity().getInstance().getInstanceId());
                backupJSON.put("uploaded_ts", new DateTime(p.getUploadedTs()).toString(FMT));
                if ("meta".equalsIgnoreCase(filter)) {
                    List<AbstractBackupPath> allFiles = metaData.get(p);
                    long totalSize = 0;
                    for (AbstractBackupPath abp : allFiles)
                        totalSize = totalSize + abp.getSize();
                    backupJSON.put("num_files", Long.toString(allFiles.size()));
                    // keyValues.put("TOTAL-SIZE", Long.toString(totalSize)); //
                    // Add Later
                }
                fileCnt++;
                jArray.put(backupJSON);
            }
            object.put("files", jArray);
            object.put("num_files", fileCnt);
        } catch (JSONException jse) {
            logger.info("Caught JSON Exception --> " + jse.getMessage());
        }
        return object;
    }

    /**
     * Convert SSTable2Json and search for given key
     */
    public void checkSSTablesForKey(String rowkey, String keyspace, String cf, String fileExtension,
            String jsonFilePath) throws Exception {
        try {
            logger.info("Starting SSTable2Json conversion ...");
            //Setting timeout to 10 Mins
            long TIMEOUT_PERIOD = 10l;
            String unixCmd = formulateCommandToRun(rowkey, keyspace, cf, fileExtension, jsonFilePath);

            String[] cmd = { "/bin/sh", "-c", unixCmd.toString() };
            final Process p = Runtime.getRuntime().exec(cmd);

            Callable<Integer> callable = new Callable<Integer>() {
                @Override
                public Integer call() throws Exception {
                    int returnCode = p.waitFor();
                    return returnCode;
                }
            };

            ExecutorService exeService = Executors.newSingleThreadExecutor();
            try {
                Future<Integer> future = exeService.submit(callable);
                int returnVal = future.get(TIMEOUT_PERIOD, TimeUnit.MINUTES);
                if (returnVal == 0)
                    logger.info("Finished SSTable2Json conversion and search.");
                else
                    logger.error("Error occurred during SSTable2Json conversion and search.");
            } catch (TimeoutException e) {
                logger.error(ExceptionUtils.getStackTrace(e));
                throw e;
            } finally {
                p.destroy();
                exeService.shutdown();
            }

        } catch (IOException e) {
            logger.error(ExceptionUtils.getStackTrace(e));
        }
    }

    public String formulateCommandToRun(String rowkey, String keyspace, String cf, String fileExtension,
            String jsonFilePath) {
        StringBuffer sbuff = new StringBuffer();

        sbuff.append("for i in $(ls " + config.getDataFileLocation() + File.separator + keyspace + File.separator
                + cf + File.separator + fileExtension + "-*-Data.db); do " + config.getCassHome()
                + SSTABLE2JSON_COMMAND_FROM_CASSHOME + " $i -k ");
        sbuff.append(rowkey);
        sbuff.append("  | grep ");
        sbuff.append(rowkey);
        sbuff.append(" >> ");
        sbuff.append(SSTABLE2JSON_DIR_LOCATION + File.separator + jsonFilePath);
        sbuff.append(" ; done");

        logger.info("SSTable2JSON location <" + SSTABLE2JSON_DIR_LOCATION + File.separator + jsonFilePath + ">");
        logger.info("Running Command = " + sbuff.toString());
        return sbuff.toString();
    }

    public void removeAllDataFiles(String ks) throws Exception {
        String cleanupDirPath = config.getDataFileLocation() + File.separator + ks;
        logger.info("Starting to clean all the files inside <" + cleanupDirPath + ">");
        SystemUtils.cleanupDir(cleanupDirPath, null);
        logger.info("*** Done cleaning all the files inside <" + cleanupDirPath + ">");
    }

}