de.cinovo.cloudconductor.agent.executors.FileExecutor.java Source code

Introduction

Here is the source code for de.cinovo.cloudconductor.agent.executors.FileExecutor.java

Source

package de.cinovo.cloudconductor.agent.executors;

/*
 * #%L
 * Node Agent for cloudconductor framework
 * %%
 * Copyright (C) 2013 - 2014 Cinovo AG
 * %%
 * 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.
 * #L%
 */

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.HashSet;
import java.util.Set;

import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
import com.google.common.io.Files;

import de.cinovo.cloudconductor.agent.exceptions.ExecutionError;
import de.cinovo.cloudconductor.agent.exceptions.TransformationErrorException;
import de.cinovo.cloudconductor.agent.helper.FileHelper;
import de.cinovo.cloudconductor.agent.helper.ServerCom;
import de.cinovo.cloudconductor.api.lib.exceptions.CloudConductorException;
import de.cinovo.cloudconductor.api.model.ConfigFile;

/**
 * Copyright 2013 Cinovo AG<br>
 * <br>
 * 
 * @author psigloch
 * 
 */
public class FileExecutor implements IExecutor<Set<String>> {

    private Set<ConfigFile> files;
    private StringBuilder errors;
    private Set<String> restart;

    /**
     * @param files the files to handle
     */
    public FileExecutor(Set<ConfigFile> files) {
        this.files = files;
        this.restart = new HashSet<>();
    }

    @Override
    public Set<String> getResult() {
        return this.restart;
    }

    @Override
    public IExecutor<Set<String>> execute() throws ExecutionError {
        this.errors = new StringBuilder();

        for (ConfigFile file : this.files) {
            File localFile = new File(file.getTargetPath());
            HashCode localFileHash = this.getChecksum(localFile);
            String serverFile;
            try {
                serverFile = ServerCom.getFileData(file);
            } catch (TransformationErrorException | CloudConductorException e) {
                continue;
            }
            HashCode serverFileHash = this.getChecksum(serverFile);

            boolean changeOccured = false;

            if (!serverFileHash.equals(localFileHash)) {
                try {
                    Files.createParentDirs(localFile);
                    Files.write(serverFile, localFile, Charset.forName("UTF-8"));
                    changeOccured = true;
                } catch (IOException e) {
                    // add error to exception list
                    this.errors.append("Failed to write file: " + localFile.getAbsolutePath());
                    this.errors.append(System.lineSeparator());
                    // just skip this file
                    continue;
                }
            }

            // set file owner and group
            try {
                if (!FileHelper.isFileOwner(localFile, file.getOwner(), file.getGroup())) {
                    FileHelper.chown(localFile, file.getOwner(), file.getGroup());
                    changeOccured = true;
                }
            } catch (IOException e) {
                this.errors.append("Failed to set user and/or group for file: " + localFile.getAbsolutePath());
                this.errors.append(System.lineSeparator());
            }

            // set file mode
            try {
                String fileMode = FileHelper.fileModeIntToString(ServerCom.getFileMode(file.getName()));
                if (!FileHelper.isFileMode(localFile, fileMode)) {
                    FileHelper.chmod(localFile, fileMode);
                    changeOccured = true;
                }
            } catch (IOException e) {
                this.errors.append("Failed to set chmod for file: " + localFile.getAbsolutePath());
                this.errors.append(System.lineSeparator());
            } catch (CloudConductorException e) {
                this.errors.append(e.getMessage());
                this.errors.append(System.lineSeparator());
            }

            // set services to restart
            if (file.isReloadable() && changeOccured) {
                this.restart.addAll(file.getDependentServices());
            }
        }

        if (!this.errors.toString().trim().isEmpty()) {
            throw new ExecutionError(this.errors.toString().trim());
        }
        return this;
    }

    @Override
    public boolean failed() {
        return !this.errors.toString().trim().isEmpty();
    }

    private HashCode getChecksum(String content) {
        return Hashing.md5().hashBytes(content.getBytes());
    }

    private HashCode getChecksum(File content) {
        try {
            return Files.hash(content, Hashing.md5());
        } catch (IOException e) {
            // should never happen, if it does-> leave checksum empty
            return null;
        }
    }

}