(Android™) SSH Parallel Remote Commands on Multiple Servers

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Shows how to execute a command in parallel on multiple servers.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Executing a command on multiple servers simultaneously is straightforward.
    // It's just a matter of using one SSH object per server..
    CkSsh ssh1 = new CkSsh();
    CkSsh ssh2 = new CkSsh();
    CkSsh ssh3 = new CkSsh();

    int port = 22;
    boolean success = ssh1.Connect("ssh-server1.com",port);
    if (success != true) {
        Log.i(TAG, ssh1.lastErrorText());
        return;
        }

    // Authenticate using login/password:
    success = ssh1.AuthenticatePw("sshLogin1","sshPassword1");
    if (success != true) {
        Log.i(TAG, ssh1.lastErrorText());
        return;
        }

    // Connect and authenticate with 2 more servers.
    // For brevity, the success/failure won't be checked...
    success = ssh2.Connect("ssh-server2.com",port);
    success = ssh2.AuthenticatePw("sshLogin2","sshPassword2");
    success = ssh3.Connect("ssh-server3.com",port);
    success = ssh3.AuthenticatePw("sshLogin3","sshPassword3");

    // Note: If we wanted, we could've used ConnectAsync and AuthenticatePwAsync
    // to do the connecting and authenticating in parallel...

    // The command to be run on each SSH server will sleep for 5 seconds,
    // and then show the current system date/time.
    String cmd = "sleep 5; date";

    // Start each command
    int ssh1Channel = ssh1.QuickCmdSend(cmd);
    if (ssh1Channel < 0) {
        Log.i(TAG, ssh1.lastErrorText());
        return;
        }

    // For brevity, we're not checking the return values here:
    int ssh2Channel = ssh2.QuickCmdSend(cmd);
    int ssh3Channel = ssh3.QuickCmdSend(cmd);

    // OK, at this point the command is running simultaneously on each server.

    // Now collect the results of each command.
    int pollTimeoutMs = 50;
    int numFinished = 0;
    int channel;
    // Note: You would rewrite this code to use arrays.
    boolean ssh1Finished = false;
    boolean ssh2Finished = false;
    boolean ssh3Finished = false;
    while (numFinished < 3) {
        // Check to see if anything has finished.
        // QuickCmdCheck returns -1 if there are no errors and nothing else finished
        // QuickCmdCheck returns -2 if there was an error (such as a lost connection)
        // QuickCmdCheck returns a channel number if a channel finished.
        if (ssh1Finished != true) {
            channel = ssh1.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                Log.i(TAG, ssh1.lastErrorText());
                return;
                }

            if (channel == ssh1Channel) {
                Log.i(TAG, "---- ssh1 channel " + String.valueOf(channel) + " finished ----");
                Log.i(TAG, ssh1.getReceivedText(channel,"ansi"));
                numFinished = numFinished + 1;
                ssh1Finished = true;
                }

            }

        if (ssh2Finished != true) {
            channel = ssh2.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                Log.i(TAG, ssh2.lastErrorText());
                return;
                }

            if (channel == ssh2Channel) {
                Log.i(TAG, "---- ssh2 channel " + String.valueOf(channel) + " finished ----");
                Log.i(TAG, ssh2.getReceivedText(channel,"ansi"));
                numFinished = numFinished + 1;
                ssh2Finished = true;
                }

            }

        if (ssh3Finished != true) {
            channel = ssh3.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                Log.i(TAG, ssh3.lastErrorText());
                return;
                }

            if (channel == ssh3Channel) {
                Log.i(TAG, "---- ssh3 channel " + String.valueOf(channel) + " finished ----");
                Log.i(TAG, ssh3.getReceivedText(channel,"ansi"));
                numFinished = numFinished + 1;
                ssh3Finished = true;
                }

            }

        }

    // --------------
    // Sample output:

    // 	---- ssh2 channel 101 finished ----
    // 	Fri Dec 23 00:25:48 UTC 2016
    // 
    // 	---- ssh3 channel 102 finished ----
    // 	Thu Dec 22 18:25:12 CST 2016
    // 
    // 	---- ssh1 channel 100 finished ----
    // 	Thu Dec 22 18:25:48 CST 2016

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}