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GUAC-1105: Reduce code complexity of AbstractGuacamoleSocketService.

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This commit is contained in:
Michael Jumper
2015-03-05 16:36:50 -08:00
parent 3166114430
commit 9d6828bf3a
3 changed files with 289 additions and 108 deletions
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239
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/glyptodon/guacamole/auth/jdbc/socket/AbstractGuacamoleSocketService.java
View File

@@ -44,7 +44,6 @@ import org.glyptodon.guacamole.GuacamoleSecurityException;
import org.glyptodon.guacamole.auth.jdbc.connection.ConnectionMapper;
import org.glyptodon.guacamole.environment.Environment;
import org.glyptodon.guacamole.net.GuacamoleSocket;
import org.glyptodon.guacamole.net.InetGuacamoleSocket;
import org.glyptodon.guacamole.net.auth.Connection;
import org.glyptodon.guacamole.net.auth.ConnectionGroup;
import org.glyptodon.guacamole.net.auth.ConnectionRecord;
@@ -214,18 +213,16 @@ public abstract class AbstractGuacamoleSocketService implements GuacamoleSocketS
}
/**
* Saves the given ActiveConnectionRecord to the database, associating it
* with the connection having the given identifier. The end date of the
* saved record will be populated with the current time.
*
* @param identifier
* The connection to associate the new record with.
* Saves the given ActiveConnectionRecord to the database. The end date of
* the saved record will be populated with the current time.
*
* @param record
* The record to save.
*/
private void saveConnectionRecord(String identifier,
ActiveConnectionRecord record) {
private void saveConnectionRecord(ActiveConnectionRecord record) {
// Get associated connection
ModeledConnection connection = record.getConnection();
// Get associated models
AuthenticatedUser user = record.getUser();
@@ -235,7 +232,7 @@ public abstract class AbstractGuacamoleSocketService implements GuacamoleSocketS
// Copy user information and timestamps into new record
recordModel.setUserID(userModel.getObjectID());
recordModel.setUsername(userModel.getIdentifier());
recordModel.setConnectionIdentifier(identifier);
recordModel.setConnectionIdentifier(connection.getIdentifier());
recordModel.setStartDate(record.getStartDate());
recordModel.setEndDate(new Date());
@@ -255,24 +252,88 @@ public abstract class AbstractGuacamoleSocketService implements GuacamoleSocketS
* If an error occurs while connecting to guacd, or while parsing
* guacd-related properties.
*/
private GuacamoleSocket getUnconfiguredGuacamoleSocket()
private GuacamoleSocket getUnconfiguredGuacamoleSocket(Runnable socketClosedCallback)
throws GuacamoleException {
// Use SSL if requested
if (environment.getProperty(Environment.GUACD_SSL, true))
return new InetGuacamoleSocket(
return new ManagedInetGuacamoleSocket(
environment.getRequiredProperty(Environment.GUACD_HOSTNAME),
environment.getRequiredProperty(Environment.GUACD_PORT)
environment.getRequiredProperty(Environment.GUACD_PORT),
socketClosedCallback
);
// Otherwise, just use straight TCP
return new InetGuacamoleSocket(
return new ManagedInetGuacamoleSocket(
environment.getRequiredProperty(Environment.GUACD_HOSTNAME),
environment.getRequiredProperty(Environment.GUACD_PORT)
environment.getRequiredProperty(Environment.GUACD_PORT),
socketClosedCallback
);
}
/**
* Task which handles cleanup of a connection associated with some given
* ActiveConnectionRecord.
*/
private class ConnectionCleanupTask implements Runnable {
/**
* Whether this task has run.
*/
private final AtomicBoolean hasRun = new AtomicBoolean(false);
/**
* The ActiveConnectionRecord whose connection will be cleaned up once
* this task runs.
*/
private final ActiveConnectionRecord activeConnection;
/**
* Creates a new task which automatically cleans up after the
* connection associated with the given ActiveConnectionRecord. The
* connection and parent group will be removed from the maps of active
* connections and groups, and exclusive access will be released.
*
* @param activeConnection
* The ActiveConnectionRecord whose associated connection should be
* cleaned up once this task runs.
*/
public ConnectionCleanupTask(ActiveConnectionRecord activeConnection) {
this.activeConnection = activeConnection;
}
@Override
public void run() {
// Only run once
if (!hasRun.compareAndSet(false, true))
return;
// Get original user and connection
AuthenticatedUser user = activeConnection.getUser();
ModeledConnection connection = activeConnection.getConnection();
// Get associated identifiers
String identifier = connection.getIdentifier();
String parentIdentifier = connection.getParentIdentifier();
// Release connection
activeConnections.remove(identifier, activeConnection);
activeConnectionGroups.remove(parentIdentifier, activeConnection);
release(user, connection);
// Release any associated group
if (activeConnection.hasBalancingGroup())
release(user, activeConnection.getBalancingGroup());
// Save history record to database
saveConnectionRecord(activeConnection);
}
}
/**
* Creates a socket for the given user which connects to the given
* connection, which MUST already be acquired via acquire(). The given
@@ -285,11 +346,6 @@ public abstract class AbstractGuacamoleSocketService implements GuacamoleSocketS
* @param user
* The user for whom the connection is being established.
*
* @param balancingGroup,
* The associated balancing group, if any. If the connection is not
* associated with a balancing group, or the connection is being used
* manually, this will be null.
*
* @param connection
* The connection the user is connecting to.
*
@@ -305,85 +361,77 @@ public abstract class AbstractGuacamoleSocketService implements GuacamoleSocketS
* If an error occurs while the connection is being established, or
* while connection configuration information is being retrieved.
*/
private GuacamoleSocket connect(final AuthenticatedUser user,
final ModeledConnectionGroup balancingGroup,
final ModeledConnection connection, GuacamoleClientInformation info)
private GuacamoleSocket getGuacamoleSocket(ActiveConnectionRecord activeConnection,
GuacamoleClientInformation info)
throws GuacamoleException {
// Create record for active connection
final ActiveConnectionRecord activeConnection = new ActiveConnectionRecord(user);
ModeledConnection connection = activeConnection.getConnection();
// Get relevant identifiers
final AtomicBoolean released = new AtomicBoolean(false);
final String identifier = connection.getIdentifier();
final String parentIdentifier = connection.getParentIdentifier();
// Record new active connection
Runnable cleanupTask = new ConnectionCleanupTask(activeConnection);
activeConnections.put(connection.getIdentifier(), activeConnection);
activeConnectionGroups.put(connection.getParentIdentifier(), activeConnection);
// Return new socket
try {
// Record new active connection
activeConnections.put(identifier, activeConnection);
activeConnectionGroups.put(parentIdentifier, activeConnection);
// Return newly-reserved connection
return new ConfiguredGuacamoleSocket(
getUnconfiguredGuacamoleSocket(),
getGuacamoleConfiguration(user, connection),
getUnconfiguredGuacamoleSocket(cleanupTask),
getGuacamoleConfiguration(activeConnection.getUser(), connection),
info
) {
@Override
public void close() throws GuacamoleException {
// Attempt to close connection
super.close();
// Release connection upon close, if not already released
if (released.compareAndSet(false, true)) {
// Release connection
activeConnections.remove(identifier, activeConnection);
activeConnectionGroups.remove(parentIdentifier, activeConnection);
release(user, connection);
// Release any associated group
if (balancingGroup != null)
release(user, balancingGroup);
// Save record to database
saveConnectionRecord(identifier, activeConnection);
}
} // end close()
};
);
}
// Release connection in case of error
// Execute cleanup if socket could not be created
catch (GuacamoleException e) {
// Release connection if not already released
if (released.compareAndSet(false, true)) {
// Release connection
activeConnections.remove(identifier, activeConnection);
activeConnectionGroups.remove(parentIdentifier, activeConnection);
release(user, connection);
// Release any associated group
if (balancingGroup != null)
release(user, balancingGroup);
}
cleanupTask.run();
throw e;
}
}
/**
* Returns a list of all balanced connections within a given connection
* group. If the connection group is not balancing, or it contains no
* connections, an empty list is returned.
*
* @param user
* The user on whose behalf the balanced connections within the given
* connection group are being retrieved.
*
* @param connectionGroup
* The connection group to retrieve the balanced connections of.
*
* @return
* A list containing all balanced connections within the given group,
* or an empty list if there are no such connections.
*/
private List<ModeledConnection> getBalancedConnections(AuthenticatedUser user,
ModeledConnectionGroup connectionGroup) {
// If not a balancing group, there are no balanced connections
if (connectionGroup.getType() != ConnectionGroup.Type.BALANCING)
return Collections.EMPTY_LIST;
// If group has no children, there are no balanced connections
Collection<String> identifiers = connectionMapper.selectIdentifiersWithin(connectionGroup.getIdentifier());
if (identifiers.isEmpty())
return Collections.EMPTY_LIST;
// Retrieve all children
Collection<ConnectionModel> models = connectionMapper.select(identifiers);
List<ModeledConnection> connections = new ArrayList<ModeledConnection>(models.size());
// Convert each retrieved model to a modeled connection
for (ConnectionModel model : models) {
ModeledConnection connection = connectionProvider.get();
connection.init(user, model);
connections.add(connection);
}
return connections;
}
@Override
@Transactional
public GuacamoleSocket getGuacamoleSocket(final AuthenticatedUser user,
@@ -392,7 +440,7 @@ public abstract class AbstractGuacamoleSocketService implements GuacamoleSocketS
// Acquire and connect to single connection
acquire(user, Collections.singletonList(connection));
return connect(user, null, connection, info);
return getGuacamoleSocket(new ActiveConnectionRecord(user, connection), info);
}
@@ -407,32 +455,17 @@ public abstract class AbstractGuacamoleSocketService implements GuacamoleSocketS
ModeledConnectionGroup connectionGroup,
GuacamoleClientInformation info) throws GuacamoleException {
// If not a balancing group, cannot connect
if (connectionGroup.getType() != ConnectionGroup.Type.BALANCING)
throw new GuacamoleSecurityException("Permission denied.");
// If group has no children, cannot connect
Collection<String> identifiers = connectionMapper.selectIdentifiersWithin(connectionGroup.getIdentifier());
if (identifiers.isEmpty())
// If group has no associated balanced connections, cannot connect
List<ModeledConnection> connections = getBalancedConnections(user, connectionGroup);
if (connections.isEmpty())
throw new GuacamoleSecurityException("Permission denied.");
// Acquire group
acquire(user, connectionGroup);
// Retrieve all children
Collection<ConnectionModel> models = connectionMapper.select(identifiers);
List<ModeledConnection> connections = new ArrayList<ModeledConnection>(models.size());
// Convert each retrieved model to a modeled connection
for (ConnectionModel model : models) {
ModeledConnection connection = connectionProvider.get();
connection.init(user, model);
connections.add(connection);
}
// Acquire and connect to any child
ModeledConnection connection = acquire(user, connections);
return connect(user, connectionGroup, connection, info);
return getGuacamoleSocket(new ActiveConnectionRecord(user, connectionGroup, connection), info);
}

83
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/glyptodon/guacamole/auth/jdbc/socket/ActiveConnectionRecord.java
View File

@@ -23,6 +23,8 @@
package org.glyptodon.guacamole.auth.jdbc.socket;
import java.util.Date;
import org.glyptodon.guacamole.auth.jdbc.connection.ModeledConnection;
import org.glyptodon.guacamole.auth.jdbc.connectiongroup.ModeledConnectionGroup;
import org.glyptodon.guacamole.auth.jdbc.user.AuthenticatedUser;
import org.glyptodon.guacamole.net.auth.ConnectionRecord;
@@ -43,21 +45,62 @@ public class ActiveConnectionRecord implements ConnectionRecord {
*/
private final AuthenticatedUser user;
/**
* The balancing group from which the associated connection was chosen, if
* any. If no balancing group was used, this will be null.
*/
private final ModeledConnectionGroup balancingGroup;
/**
* The connection associated with this connection record.
*/
private final ModeledConnection connection;
/**
* The time this connection record was created.
*/
private final Date startDate = new Date();
/**
* Creates a new connection record associated with the given user. The
* start date of this connection record will be the time of its creation.
* Creates a new connection record associated with the given user,
* connection, and balancing connection group. The given balancing
* connection group MUST be the connection group from which the given
* connection was chosen. The start date of this connection record will be
* the time of its creation.
*
* @param user
* The user that connected to the connection associated with this
* connection record.
*
* @param balancingGroup
* The balancing group from which the given connection was chosen.
*
* @param connection
* The connection to associate with this connection record.
*/
public ActiveConnectionRecord(AuthenticatedUser user) {
public ActiveConnectionRecord(AuthenticatedUser user,
ModeledConnectionGroup balancingGroup,
ModeledConnection connection) {
this.user = user;
this.balancingGroup = balancingGroup;
this.connection = connection;
}
/**
* Creates a new connection record associated with the given user and
* connection. The start date of this connection record will be the time of
* its creation.
*
* @param user
* The user that connected to the connection associated with this
* connection record.
*
* @param connection
* The connection to associate with this connection record.
*/
public ActiveConnectionRecord(AuthenticatedUser user,
ModeledConnection connection) {
this(user, null, connection);
}
/**
@@ -72,6 +115,40 @@ public class ActiveConnectionRecord implements ConnectionRecord {
return user;
}
/**
* Returns the balancing group from which the connection associated with
* this connection record was chosen.
*
* @return
* The balancing group from which the connection associated with this
* connection record was chosen.
*/
public ModeledConnectionGroup getBalancingGroup() {
return balancingGroup;
}
/**
* Returns the connection associated with this connection record.
*
* @return
* The connection associated with this connection record.
*/
public ModeledConnection getConnection() {
return connection;
}
/**
* Returns whether the connection associated with this connection record
* was chosen from a balancing group.
*
* @return
* true if the connection associated with this connection record was
* chosen from a balancing group, false otherwise.
*/
public boolean hasBalancingGroup() {
return balancingGroup != null;
}
@Override
public Date getStartDate() {
return startDate;

71
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/glyptodon/guacamole/auth/jdbc/socket/ManagedInetGuacamoleSocket.java Normal file
View File

@@ -0,0 +1,71 @@
/*
* Copyright (C) 2015 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.glyptodon.guacamole.auth.jdbc.socket;
import org.glyptodon.guacamole.GuacamoleException;
import org.glyptodon.guacamole.net.InetGuacamoleSocket;
/**
* Implementation of GuacamoleSocket which connects via TCP to a given hostname
* and port. If the socket is closed for any reason, a given task is run.
*
* @author Michael Jumper
*/
public class ManagedInetGuacamoleSocket extends InetGuacamoleSocket {
/**
* The task to run when the socket is closed.
*/
private final Runnable socketClosedTask;
/**
* Creates a new socket which connects via TCP to a given hostname and
* port. If the socket is closed for any reason, the given task is run.
*
* @param hostname
* The hostname of the Guacamole proxy server to connect to.
*
* @param port
* The port of the Guacamole proxy server to connect to.
*
* @param socketClosedTask
* The task to run when the socket is closed. This task will NOT be
* run if an exception occurs during connection, and this
* ManagedInetGuacamoleSocket instance is ultimately not created.
*
* @throws GuacamoleException
* If an error occurs while connecting to the Guacamole proxy server.
*/
public ManagedInetGuacamoleSocket(String hostname, int port,
Runnable socketClosedTask) throws GuacamoleException {
super(hostname, port);
this.socketClosedTask = socketClosedTask;
}
@Override
public void close() throws GuacamoleException {
super.close();
socketClosedTask.run();
}
}