org.apache.airavata.gfac.jclouds.utils.JCloudsFileTransfer.java Source code

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Here is the source code for org.apache.airavata.gfac.jclouds.utils.JCloudsFileTransfer.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.airavata.gfac.jclouds.utils;

import com.google.common.io.ByteSource;
import com.google.common.io.ByteStreams;
import com.google.common.io.Files;
import org.apache.airavata.gfac.jclouds.exceptions.FileTransferException;
import org.jclouds.compute.ComputeServiceContext;
import org.jclouds.compute.domain.ExecChannel;
import org.jclouds.compute.domain.ExecResponse;
import org.jclouds.compute.domain.NodeMetadata;
import org.jclouds.compute.domain.NodeMetadataBuilder;
import org.jclouds.domain.LoginCredentials;
import org.jclouds.io.ByteSources;
import org.jclouds.io.Payload;
import org.jclouds.io.payloads.ByteSourcePayload;
import org.jclouds.ssh.SshClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

public class JCloudsFileTransfer {
    private static final Logger log = LoggerFactory.getLogger(JCloudsFileTransfer.class);
    private SshClient ssh;

    public JCloudsFileTransfer(ComputeServiceContext context, String nodeId, LoginCredentials credentials) {
        NodeMetadata node = context.getComputeService().getNodeMetadata(nodeId);
        ssh = context.utils().sshForNode()
                .apply(NodeMetadataBuilder.fromNodeMetadata(node).credentials(credentials).build());
    }

    public void uploadFileToEc2(String remoteFile, String localFile) throws FileTransferException {
        try {
            ssh.connect();
            File file = new File(localFile);
            ByteSource byteSource = Files.asByteSource(file);
            Payload payload = new ByteSourcePayload(byteSource);
            payload.getContentMetadata().setContentLength(byteSource.size());
            ssh.put(remoteFile, payload);

        } catch (Exception e) {
            log.error("Error occured while uploading file to ec2");
            throw new FileTransferException("Error occured while uploading file " + remoteFile + " to ec2 host");
        } finally {
            if (ssh != null) {
                ssh.disconnect();
            }
        }

    }

    public void downloadFilesFromEc2(String localFile, String remoteFile) throws FileTransferException {
        FileOutputStream ops;
        try {
            ssh.connect();
            ops = new FileOutputStream(new File(localFile));
            Payload payload = ssh.get(remoteFile);
            InputStream inputStream = payload.openStream();
            byte[] bytes = ByteStreams.toByteArray(inputStream);
            ByteSource byteSource = ByteSource.wrap(bytes);
            byteSource.copyTo(ops);
            inputStream.close();
            ops.close();
        } catch (Exception e) {
            log.error("Error occured while downloading file from ec2");
            throw new FileTransferException(
                    "Error occured while downloading file " + remoteFile + " from ec2 host");
        } finally {
            if (ssh != null)
                ssh.disconnect();
        }
    }

    public ExecChannel execCommand(String command) {
        ExecChannel channel = null;
        try {
            ssh.connect();
            channel = ssh.execChannel(command);

        } catch (Exception e) {
            log.error("error in getting the execChannel");
        }
        return channel;
    }
}