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/*
* Copyright 2003-2004 Apache Software Foundation
*
* 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 org.apache.tools.ant.taskdefs.optional.ssh;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import java.io.IOException;
import java.io.OutputStream;
import java.io.InputStream;
import java.text.NumberFormat;
import org.apache.tools.ant.BuildException;
public abstract class AbstractSshMessage {
private Session session;
private LogListener listener = new LogListener() {
public void log(String message) {
// do nothing;
}
};
public AbstractSshMessage(Session session) {
this.session = session;
}
protected Channel openExecChannel(String command) throws JSchException {
ChannelExec channel = (ChannelExec) session.openChannel("exec");
channel.setCommand(command);
return channel;
}
protected void sendAck(OutputStream out) throws IOException {
byte[] buf = new byte[1];
buf[0] = 0;
out.write(buf);
out.flush();
}
/**
* Reads the response, throws a BuildException if the response
* indicates an error.
*/
protected void waitForAck(InputStream in)
throws IOException, BuildException {
int b = in.read();
// b may be 0 for success,
// 1 for error,
// 2 for fatal error,
if (b == -1) {
// didn't receive any response
throw new BuildException("No response from server");
} else if (b != 0) {
StringBuffer sb = new StringBuffer();
int c = in.read();
while (c > 0 && c != '\n') {
sb.append((char) c);
c = in.read();
}
if (b == 1) {
throw new BuildException("server indicated an error: "
+ sb.toString());
} else if (b == 2) {
throw new BuildException("server indicated a fatal error: "
+ sb.toString());
} else {
throw new BuildException("unknown response, code " + b
+ " message: " + sb.toString());
}
}
}
public abstract void execute() throws IOException, JSchException;
public void setLogListener(LogListener aListener) {
listener = aListener;
}
protected void log(String message) {
listener.log(message);
}
protected void logStats(long timeStarted,
long timeEnded,
int totalLength) {
double duration = (timeEnded - timeStarted) / 1000.0;
NumberFormat format = NumberFormat.getNumberInstance();
format.setMaximumFractionDigits(2);
format.setMinimumFractionDigits(1);
listener.log("File transfer time: " + format.format(duration)
+ " Average Rate: " + format.format(totalLength / duration)
+ " B/s");
}
}
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