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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.jclouds.virtualbox.util;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Supplier;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.Uninterruptibles;
import com.google.inject.Inject;
import org.jclouds.compute.callables.RunScriptOnNode;
import org.jclouds.compute.callables.RunScriptOnNode.Factory;
import org.jclouds.compute.domain.ExecResponse;
import org.jclouds.compute.domain.NodeMetadata;
import org.jclouds.compute.options.RunScriptOptions;
import org.jclouds.compute.reference.ComputeServiceConstants;
import org.jclouds.logging.Logger;
import org.jclouds.scriptbuilder.domain.Statement;
import org.jclouds.util.Throwables2;
import org.virtualbox_4_2.IMachine;
import org.virtualbox_4_2.ISession;
import org.virtualbox_4_2.LockType;
import org.virtualbox_4_2.SessionState;
import org.virtualbox_4_2.VBoxException;
import org.virtualbox_4_2.VirtualBoxManager;
import javax.annotation.Resource;
import javax.inject.Named;
import javax.inject.Singleton;
import java.util.concurrent.TimeUnit;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static org.jclouds.util.Predicates2.retry;
/**
* Utilities for executing functions on a VirtualBox machine.
*
* @author Adrian Cole, Mattias Holmqvist, Andrea Turli, David Alves
*/
@Singleton
public class MachineUtils {
public static final String IP_V4_ADDRESS_PATTERN = "^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
+ "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
+ "([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";
@Resource
@Named(ComputeServiceConstants.COMPUTE_LOGGER)
protected Logger logger = Logger.NULL;
private final Supplier manager;
private final Factory scriptRunner;
@Inject
public MachineUtils(Supplier manager, RunScriptOnNode.Factory scriptRunner) {
this.manager = manager;
this.scriptRunner = scriptRunner;
}
public ListenableFuture runScriptOnNode(NodeMetadata metadata, Statement statement,
RunScriptOptions options) {
return scriptRunner.submit(metadata, statement, options);
}
/**
* Locks the machine and executes the given function using the machine matching the given id.
* Since the machine is locked it is possible to perform some modifications to the IMachine.
*
* Unlocks the machine before returning.
*
* @param machineId
* the id of the machine
* @param function
* the function to execute
* @return the result from applying the function to the machine.
*/
public T writeLockMachineAndApply(final String machineId, final Function function) {
return lockSessionOnMachineAndApply(machineId, LockType.Write, new Function() {
@Override
public T apply(ISession session) {
return function.apply(session.getMachine());
}
@Override
public String toString() {
return function.toString();
}
});
}
/**
* Locks the machine and executes the given function using the machine matching the given id. The
* machine is write locked and modifications to the session that reflect on the machine can be
* done safely.
*
* Unlocks the machine before returning.
*
* @param machineId
* the id of the machine
* @param function
* the function to execute
* @return the result from applying the function to the machine.
*/
public T writeLockMachineAndApplyToSession(final String machineId, final Function function) {
return lockSessionOnMachineAndApply(machineId, LockType.Write, function);
}
/**
* Locks the machine and executes the given function using the machine matching the given id. The
* machine is read locked, which means that settings can be read safely (but not changed) by
* function.
*
* Unlocks the machine before returning.
*
* @param machineId
* the id of the machine
* @param function
* the function to execute
* @return the result from applying the function to the machine.
*/
public T sharedLockMachineAndApply(final String machineId, final Function function) {
return lockSessionOnMachineAndApply(machineId, LockType.Shared, new Function() {
@Override
public T apply(ISession session) {
return function.apply(session.getMachine());
}
@Override
public String toString() {
return function.toString();
}
});
}
/**
* Locks the machine and executes the given function to the session using the machine matching
* the given id. The machine is read locked, which means that settings can be read safely (but
* not changed) by function.
*
* Unlocks the machine before returning.
*
* @param machineId
* the id of the machine
* @param function
* the function to execute
* @return the result from applying the function to the machine.
*/
public T sharedLockMachineAndApplyToSession(final String machineId, final Function function) {
return lockSessionOnMachineAndApply(machineId, LockType.Shared, function);
}
/**
* Locks the machine and executes the given function using the current session. Since the machine
* is locked it is possible to perform some modifications to the IMachine.
*
* Unlocks the machine before returning.
*
* Tries to obtain a lock 15 times before giving up waiting 1 sec between tries. When no machine
* is found null is returned.
*
* @param type
* the kind of lock to use when initially locking the machine.
* @param machineId
* the id of the machine
* @param function
* the function to execute
* @return the result from applying the function to the session.
*/
protected T lockSessionOnMachineAndApply(String machineId, LockType type, Function function) {
int retries = 15;
ISession session = checkNotNull(lockSession(machineId, type, retries), "session");
try {
return function.apply(session);
} catch (VBoxException e) {
throw new RuntimeException(String.format("error applying %s to %s with %s lock: %s", function, machineId,
type, e.getMessage()), e);
} finally {
// this is a workaround for shared lock type, where session state is not updated immediately
if(type == LockType.Shared) {
Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
}
if (session.getState().equals(SessionState.Locked)) {
session.unlockMachine();
}
if(!session.getState().equals(SessionState.Unlocked)) {
checkSessionIsUnlocked(session, 5, 3L, TimeUnit.SECONDS);
}
}
}
private ISession lockSession(String machineId, LockType type, int retries) {
int count = 0;
IMachine immutableMachine = manager.get().getVBox().findMachine(machineId);
ISession session;
while (true) {
try {
session = manager.get().getSessionObject();
immutableMachine.lockMachine(session, type);
break;
} catch (VBoxException e) {
VBoxException vbex = Throwables2.getFirstThrowableOfType(e, VBoxException.class);
if (vbex != null && machineNotFoundException(vbex)) {
return null;
}
count++;
logger.debug("Could not lock machine (try %d of %d). Error: %s", count, retries, e.getMessage());
if (count == retries) {
throw new RuntimeException(String.format("error locking %s with %s lock: %s", machineId, type,
e.getMessage()), e);
}
Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
}
}
checkState(session.getState().equals(SessionState.Locked));
return checkNotNull(session, "session");
}
/**
* @param machineId
* @param function
* @return
*/
public T applyForMachine(final String machineId, final Function function) {
final IMachine immutableMachine = manager.get().getVBox().findMachine(machineId);
return new Function() {
@Override
public T apply(IMachine machine) {
return function.apply(machine);
}
@Override
public String toString() {
return function.toString();
}
}.apply(immutableMachine);
}
public static boolean machineNotFoundException(VBoxException e) {
return e.getMessage().contains("VirtualBox error: Could not find a registered machine named ")
|| e.getMessage().contains("Could not find a registered machine with UUID {");
}
private void checkSessionIsUnlocked(ISession session, int attempts, long period, TimeUnit timeUnit) {
checkState(
retry(new SessionStatePredicate(session), attempts * period, period, timeUnit).apply(SessionState.Unlocked),
"timed out or number of retries(%s) reached waiting for session to be unlocked", attempts);
}
private static class SessionStatePredicate implements Predicate {
private final ISession session;
SessionStatePredicate(ISession session) {
this.session = session;
}
@Override
public boolean apply(SessionState input) {
return session.getState().equals(input);
}
}
}
