org.apache.zeppelin.storage.LocalConfigStorage.java Source code

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Here is the source code for org.apache.zeppelin.storage.LocalConfigStorage.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.zeppelin.storage;

import org.apache.commons.io.IOUtils;
import org.apache.zeppelin.conf.ZeppelinConfiguration;
import org.apache.zeppelin.interpreter.InterpreterInfoSaving;
import org.apache.zeppelin.notebook.NotebookAuthorizationInfoSaving;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.FileSystems;
import java.nio.file.FileSystem;
import java.nio.file.StandardCopyOption;

/**
 * Storing config in local file system
 */
public class LocalConfigStorage extends ConfigStorage {

    private static Logger LOGGER = LoggerFactory.getLogger(LocalConfigStorage.class);

    private File interpreterSettingPath;
    private File authorizationPath;
    private File credentialPath;

    public LocalConfigStorage(ZeppelinConfiguration zConf) {
        super(zConf);
        this.interpreterSettingPath = new File(zConf.getInterpreterSettingPath());
        this.authorizationPath = new File(zConf.getNotebookAuthorizationPath());
        this.credentialPath = new File(zConf.getCredentialsPath());
    }

    @Override
    public void save(InterpreterInfoSaving settingInfos) throws IOException {
        LOGGER.info("Save Interpreter Setting to " + interpreterSettingPath.getAbsolutePath());
        atomicWriteToFile(settingInfos.toJson(), interpreterSettingPath);
    }

    @Override
    public InterpreterInfoSaving loadInterpreterSettings() throws IOException {
        if (!interpreterSettingPath.exists()) {
            LOGGER.warn("Interpreter Setting file {} is not existed", interpreterSettingPath);
            return null;
        }
        LOGGER.info("Load Interpreter Setting from file: " + interpreterSettingPath);
        String json = readFromFile(interpreterSettingPath);
        return buildInterpreterInfoSaving(json);
    }

    @Override
    public void save(NotebookAuthorizationInfoSaving authorizationInfoSaving) throws IOException {
        LOGGER.info("Save notebook authorization to file: " + authorizationPath);
        atomicWriteToFile(authorizationInfoSaving.toJson(), authorizationPath);
    }

    @Override
    public NotebookAuthorizationInfoSaving loadNotebookAuthorization() throws IOException {
        if (!authorizationPath.exists()) {
            LOGGER.warn("NotebookAuthorization file {} is not existed", authorizationPath);
            return null;
        }
        LOGGER.info("Load notebook authorization from file: " + authorizationPath);
        String json = readFromFile(authorizationPath);
        return NotebookAuthorizationInfoSaving.fromJson(json);
    }

    @Override
    public String loadCredentials() throws IOException {
        if (!credentialPath.exists()) {
            LOGGER.warn("Credential file {} is not existed", credentialPath);
            return null;
        }
        LOGGER.info("Load Credential from file: " + credentialPath);
        return readFromFile(credentialPath);
    }

    @Override
    public void saveCredentials(String credentials) throws IOException {
        LOGGER.info("Save Credentials to file: " + credentialPath);
        atomicWriteToFile(credentials, credentialPath);
    }

    private String readFromFile(File file) throws IOException {
        return IOUtils.toString(new FileInputStream(file));
    }

    private void atomicWriteToFile(String content, File file) throws IOException {
        File directory = file.getParentFile();
        File tempFile = File.createTempFile(file.getName(), null, directory);
        FileOutputStream out = new FileOutputStream(tempFile);
        try {
            IOUtils.write(content, out);
        } catch (IOException iox) {
            if (!tempFile.delete()) {
                tempFile.deleteOnExit();
            }
            throw iox;
        }
        out.close();
        FileSystem defaultFileSystem = FileSystems.getDefault();
        Path tempFilePath = defaultFileSystem.getPath(tempFile.getCanonicalPath());
        Path destinationFilePath = defaultFileSystem.getPath(file.getCanonicalPath());
        try {
            Files.move(tempFilePath, destinationFilePath, StandardCopyOption.ATOMIC_MOVE);
        } catch (IOException iox) {
            if (!tempFile.delete()) {
                tempFile.deleteOnExit();
            }
            throw iox;
        }
    }

}