/**
* Copyright (C) 2012 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.livedata.cogda.server;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import org.fudgemsg.FudgeContext;
import org.fudgemsg.FudgeMsg;
import org.fudgemsg.FudgeMsgEnvelope;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.Lifecycle;
import com.codahale.metrics.Meter;
import com.codahale.metrics.MetricRegistry;
import com.opengamma.core.user.UserAccount;
import com.opengamma.core.user.UserSource;
import com.opengamma.core.user.impl.SimpleUserAccount;
import com.opengamma.id.ExternalId;
import com.opengamma.livedata.LiveDataSpecification;
import com.opengamma.livedata.LiveDataValueUpdate;
import com.opengamma.livedata.UserPrincipal;
import com.opengamma.livedata.server.LastKnownValueStore;
import com.opengamma.livedata.server.LastKnownValueStoreProvider;
import com.opengamma.livedata.server.LiveDataServer;
import com.opengamma.transport.FudgeConnection;
import com.opengamma.transport.FudgeConnectionReceiver;
import com.opengamma.transport.socket.ServerSocketFudgeConnectionReceiver;
import com.opengamma.util.ArgumentChecker;
import com.opengamma.util.fudgemsg.OpenGammaFudgeContext;
import com.opengamma.util.metric.MetricProducer;
/**
* The base server process for any Cogda Live Data Server.
* <p/>
* By default, it will operate in a completely unauthenticated mode. User names and passwords
* in connection requests will be ignored, and all fields will be accessible by any connection.
* However, in combination with an injected {@link UserSource} (see {@link #setUserSource(UserSource)}),
* the server will authenticate users and authorize access.
* If the server has a {@link UserSource} provided, but the {@code checkPassword} parameter
* is set to false (see {@link #setCheckPassword(boolean)}) then only authorization will be provided and it is assumed
* that authentication is handled elsewhere in the overall application and so user credentials
* can be assumed to be valid without a password being provided.
* <p/>
* Because the {@link UserSource} will be hit for every authorization question, it is <strong>critical</strong>
* that the source caches requests in some form.
*/
public class CogdaLiveDataServer implements LiveDataServer, FudgeConnectionReceiver, Lifecycle, MetricProducer {
/** Logger. */
private static final Logger s_logger = LoggerFactory.getLogger(CogdaLiveDataServer.class);
/**
* The default port on which the server will listen for inbound connections.
*/
public static final int DEFAULT_LISTEN_PORT = 11876;
private int _portNumber = DEFAULT_LISTEN_PORT;
private final ServerSocketFudgeConnectionReceiver _connectionReceiver;
private final LastKnownValueStoreProvider _lastKnownValueStoreProvider;
private final ConcurrentMap<LiveDataSpecification, LastKnownValueStore> _lastKnownValueStores =
new ConcurrentHashMap<LiveDataSpecification, LastKnownValueStore>();
private final Set<CogdaClientConnection> _clients = new CopyOnWriteArraySet<CogdaClientConnection>();
// TODO kirk 2012-07-23 -- This is absolutely the wrong executor here.
private final Executor _valueUpdateSendingExecutor = Executors.newFixedThreadPool(5);
private UserSource _userSource;
private boolean _checkPassword = true;
// Metrics:
private Meter _tickMeter = new Meter();
public CogdaLiveDataServer(LastKnownValueStoreProvider lkvStoreProvider) {
this(lkvStoreProvider, OpenGammaFudgeContext.getInstance());
}
public CogdaLiveDataServer(LastKnownValueStoreProvider lkvStoreProvider, FudgeContext fudgeContext) {
ArgumentChecker.notNull(lkvStoreProvider, "lkvStoreProvider");
ArgumentChecker.notNull(fudgeContext, "fudgeContext");
_lastKnownValueStoreProvider = lkvStoreProvider;
_connectionReceiver = new ServerSocketFudgeConnectionReceiver(fudgeContext, this);
_connectionReceiver.setLazyFudgeMsgReads(false);
}
@Override
public synchronized void registerMetrics(MetricRegistry summaryRegistry, MetricRegistry detailedRegistry, String namePrefix) {
_tickMeter = summaryRegistry.meter(namePrefix + ".ticks");
}
/**
* Gets the portNumber.
* @return the portNumber
*/
public int getPortNumber() {
return _portNumber;
}
/**
* Sets the portNumber. Defaults to {@link #DEFAULT_LISTEN_PORT}.
* This <b>must</b> be set <b>before</b> {@link #start()} is called.
* @param portNumber the portNumber
*/
public void setPortNumber(int portNumber) {
_portNumber = portNumber;
}
/**
* Gets the lastKnownValueStoreProvider.
* @return the lastKnownValueStoreProvider
*/
public LastKnownValueStoreProvider getLastKnownValueStoreProvider() {
return _lastKnownValueStoreProvider;
}
/**
* Gets the userSource.
* @return the userSource
*/
public UserSource getUserSource() {
return _userSource;
}
/**
* Sets the userSource.
* @param userSource the userSource
*/
public void setUserSource(UserSource userSource) {
_userSource = userSource;
}
/**
* Whether passwords will be checked.
* @return true if passwords will be checked.
*/
public boolean isCheckPassword() {
return _checkPassword;
}
/**
* Sets whether passwords will be checked.
* Setting to false means that only authorization will be performed
* rather than authentication.
* @param checkPassword false to turn off password checking on connections.
*/
public void setCheckPassword(boolean checkPassword) {
_checkPassword = checkPassword;
}
@Override
public void connectionReceived(FudgeContext fudgeContext, FudgeMsgEnvelope message, FudgeConnection connection) {
CogdaClientConnection clientConnection = new CogdaClientConnection(fudgeContext, this, connection);
// We're blocked on connection acceptance. Therefore it's entirely fine
// to do the handshake here as we won't get any more messages until
// it's done.
clientConnection.handshakeMessage(fudgeContext, message);
_clients.add(clientConnection);
}
@Override
public void start() {
_connectionReceiver.setPortNumber(getPortNumber());
_connectionReceiver.start();
}
@Override
public void stop() {
_connectionReceiver.stop();
}
@Override
public boolean isRunning() {
return _connectionReceiver.isRunning();
}
public void liveDataReceived(LiveDataValueUpdate valueUpdate) {
_tickMeter.mark();
// REVIEW kirk 2013-03-27 -- Does this loop need to be done in an executor
// task or something? If nothing else, connection.liveDataReceived() can
// block.
// This could probably be much much faster, but we're designed initially for low-frequency
// updates. Someone smarter should optimize the data structures here.
for (CogdaClientConnection connection : _clients) {
boolean needsPump = connection.liveDataReceived(valueUpdate);
if (needsPump) {
final CogdaClientConnection finalConnection = connection;
_valueUpdateSendingExecutor.execute(new Runnable() {
@Override
public void run() {
finalConnection.sendAllUpdates();
}
});
}
}
}
protected UserAccount getUserAccount(String userName) {
if (getUserSource() == null) {
// Nothing will work without a UserAccount. So we return a mock one.
SimpleUserAccount simpleUser = new SimpleUserAccount(userName);
simpleUser.getPermissions().add("*");
return simpleUser;
}
try {
return getUserSource().getAccount(userName);
} catch (RuntimeException ex) {
s_logger.warn("Authentication could not find user {}", userName);
return null;
}
}
// Callbacks from the client.
public UserPrincipal authenticate(String userId, String password) {
if (getUserSource() == null) {
// No user source. Allow all connections.
return UserPrincipal.getLocalUser(userId);
}
UserAccount user = getUserAccount(userId);
if (user == null) {
s_logger.info("Not allowing login for {} because no user in UserSource", userId);
return null;
}
// password check not supported
return UserPrincipal.getLocalUser(userId);
}
public List<String> getAvailableServers() {
return Collections.emptyList();
}
public FudgeMsg getCapabilities() {
return OpenGammaFudgeContext.getInstance().newMessage();
}
public boolean isValidLiveData(ExternalId subscriptionId, String normalizationScheme) {
return getLastKnownValueStoreProvider().isAvailable(subscriptionId, normalizationScheme);
}
public LastKnownValueStore getLastKnownValueStore(ExternalId subscriptionId, String normalizationScheme) {
LiveDataSpecification ldspec = new LiveDataSpecification(normalizationScheme, subscriptionId);
// TODO kirk 2012-07-23 -- Check to see if valid.
LastKnownValueStore store = _lastKnownValueStores.get(ldspec);
if (store == null) {
LastKnownValueStore fresh = getLastKnownValueStoreProvider().newInstance(subscriptionId, normalizationScheme);
LastKnownValueStore fromMap = _lastKnownValueStores.putIfAbsent(ldspec, fresh);
if (fromMap == null) {
store = fresh;
} else {
store = fromMap;
}
}
return store;
}
public void removeClient(CogdaClientConnection connection) {
_clients.remove(connection);
}
public int getNumClients() {
return _clients.size();
}
public Set<String> getActiveUsers() {
Set<String> result = new TreeSet<String>();
synchronized (_clients) {
for (CogdaClientConnection connection : _clients) {
result.add(connection.getUserPrincipal().toString());
}
}
return result;
}
}