Ec2SshTask.java

/**
 * Copyright 2010 the original author or authors.
 *
 * 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 datameer.awstasks.ant.ec2;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.TaskContainer;

import awstasks.com.amazonaws.services.ec2.AmazonEC2;

import datameer.awstasks.ant.ec2.model.ScpDownload;
import datameer.awstasks.ant.ec2.model.ScpUpload;
import datameer.awstasks.ant.ec2.model.SshCommand;
import datameer.awstasks.ant.ec2.model.SshExec;
import datameer.awstasks.aws.ec2.InstanceGroup;
import datameer.awstasks.aws.ec2.InstanceGroupImpl;
import datameer.awstasks.aws.ec2.ssh.SshClient;

public class Ec2SshTask extends AbstractEc2Task implements TaskContainer {

    private String _username;
    private String _password;
    private File _keyFile;
    private boolean _connectRetries;
    private List<Object> _commands = new ArrayList<Object>();
    private Map<String, String> _propertyMap = new HashMap<String, String>();
    private InstanceGroup _instanceGroup;

    public Ec2SshTask() {
        // default constructor - needed by ant
    }

    public Ec2SshTask(InstanceGroup instanceGroup) {
        _instanceGroup = instanceGroup;
    }

    public String getUsername() {
        return _username;
    }

    public void setUsername(String username) {
        _username = username;
    }

    public String getPassword() {
        return _password;
    }

    public void setPassword(String password) {
        _password = password;
    }

    public File getKeyFile() {
        return _keyFile;
    }

    public void setKeyFile(File keyFile) {
        _keyFile = keyFile;
    }

    public void setConnectRetries(boolean connectRetries) {
        _connectRetries = connectRetries;
    }

    public boolean isConnectRetries() {
        return _connectRetries;
    }

    @Override
    public void addTask(Task task) {
        _commands.add(task);
    }

    public void addUpload(ScpUpload upload) {
        _commands.add(upload);
    }

    public void addDownload(ScpDownload download) {
        _commands.add(download);
    }

    public void addExec(SshExec sshExec) {
        _commands.add(sshExec);
    }

    @Override
    public void doExecute(AmazonEC2 ec2) throws BuildException {
        LOG.info("executing " + getClass().getSimpleName() + " for group '" + _groupName + "'");
        if (_instanceGroup == null) {
            _instanceGroup = new InstanceGroupImpl(ec2);
        }

        try {
            _instanceGroup.connectTo(_groupName);
            int instanceCount = _instanceGroup.instanceCount();

            // verify targetIndexes specifications
            for (Object command : _commands) {
                if (command instanceof SshCommand) {
                    ((SshCommand) command).verify(instanceCount);
                }
            }

            // execute the commands
            SshClient sshClient = createSshClient();
            for (Object command : _commands) {
                if (command instanceof SshCommand) {
                    ((SshCommand) command).execute(getProject(), _propertyMap, sshClient, instanceCount);
                } else if (command instanceof Task) {
                    ((Task) command).perform();
                } else {
                    throw new IllegalStateException("type '" + command.getClass().getName() + "' not supported here");
                }
            }

            for (String propertyName : _propertyMap.keySet()) {
                getProject().setNewProperty(propertyName, _propertyMap.get(propertyName));
            }
        } catch (Exception e) {
            throw new BuildException(e);
        }
    }

    private SshClient createSshClient() {
        if (_keyFile != null) {
            return _instanceGroup.createSshClient(_username, _keyFile);
        }
        return _instanceGroup.createSshClient(_username, _password);
    }

}