package com.webobjects.monitor.wotaskd;
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import java.net.InetAddress;
import java.net.UnknownHostException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.webobjects.appserver.WOApplication;
import com.webobjects.appserver.WORequest;
import com.webobjects.appserver.WORequestHandler;
import com.webobjects.appserver.WOResponse;
import com.webobjects.appserver._private.WOHostUtilities;
import com.webobjects.foundation.NSArray;
import com.webobjects.foundation.NSLog;
import com.webobjects.foundation.NSTimestamp;
import com.webobjects.monitor._private.MInstance;
public class LifebeatRequestHandler extends WORequestHandler {
private static final Logger log = LoggerFactory.getLogger(LifebeatRequestHandler.class);
InetAddress myInetAddress;
String myName;
Application theApplication;
WOResponse BadLifebeatResponse, GoodResponse, DieResponse;
public LifebeatRequestHandler() {
super();
theApplication = ((Application)WOApplication.application());
myInetAddress = theApplication.hostAddress();
myName = myInetAddress.getHostName();
GoodResponse = theApplication.createResponseInContext(null);
GoodResponse.setStatus(200); // OK
GoodResponse.setHTTPVersion("HTTP/1.1");
BadLifebeatResponse = theApplication.createResponseInContext(null);
BadLifebeatResponse.setStatus(400); // Bad Request
BadLifebeatResponse.setHTTPVersion("HTTP/1.0");
DieResponse = theApplication.createResponseInContext(null);
DieResponse.setStatus(500); // InternalServerError -> Die Immediately
DieResponse.setHTTPVersion("HTTP/1.0");
}
@Override
public WOResponse handleRequest(WORequest aRequest) {
// Sadly, we do regenerate in the case of random lifebeats. Hopefully this won't be too often.
// Didn't pull this out so that we can rely on isUsingWebServer to catch some bad requests
if ( (!aRequest.isUsingWebServer()) && (WOHostUtilities.isLocalInetAddress(aRequest._originatingAddress(), true)) ) {
Object lock = WOApplication.application().requestHandlingLock();
if (lock!=null) {
synchronized(lock) {
return _handleRequest(aRequest);
}
}
return _handleRequest(aRequest);
}
return null;
}
private WOResponse _handleRequest(WORequest aRequest) {
WOResponse aResponse = BadLifebeatResponse;
// http://localhost:1085/cgi-bin/WebObjects/wotaskd.woa/wlb?<notification name>&<instance name>&<hostname>&<port>
// <notification name> = "hasStarted", "lifebeat", "willStop", "willCrash"
NSArray values = NSArray.componentsSeparatedByString(aRequest.queryString(), "&");
if ( (values == null) || (values.count() != 4) ) {
theApplication.siteConfig().globalErrorDictionary.takeValueForKey((myName + ": Received bad lifebeat: " + aRequest.queryString()), aRequest.queryString());
log.error("{}: Received bad lifebeat: {}", myName, aRequest.queryString());
} else {
String notificationType = (String)values.objectAtIndex(0);
String instanceName = (String)values.objectAtIndex(1);
String host = (String)values.objectAtIndex(2);
String port = (String)values.objectAtIndex(3);
if (NSLog.debugLoggingAllowedForLevelAndGroups(NSLog.DebugLevelInformational, NSLog.DebugGroupDeployment))
NSLog.debug.appendln("@@@@@ Received Lifebeat: " + notificationType + " " + instanceName + " " + host + " " + port);
if (notificationType.equals("lifebeat")) {
// app is still alive - update registration
// if app is not yet registered, register
// if the instance should die, return DieResponse
if (registerLifebeat(instanceName, host, port) == false) {
aResponse = DieResponse;
} else {
aResponse = GoodResponse;
}
} else if (notificationType.equals("hasStarted")) {
// app has just started - register instance
registerStart(instanceName, host, port);
aResponse = GoodResponse;
} else if (notificationType.equals("willStop")) {
// app will stop - mark as dead
registerStop(instanceName, host, port);
aResponse = null;
} else if (notificationType.equals("willCrash")) {
// app will crash - mark as dead, email notification
registerCrash(instanceName, host, port);
aResponse = null;
} else {
theApplication.siteConfig().globalErrorDictionary.takeValueForKey((myName + ": Received bad lifebeat: " + aRequest.queryString()), aRequest.queryString());
log.error("{}: Received bad lifebeat: {}", myName, aRequest.queryString());
}
}
if ("HTTP/1.0".equals(aRequest.httpVersion())) {
aResponse = null;
}
return aResponse;
}
private InetAddress addressForName(String name) {
try {
return InetAddress.getByName(name);
} catch (UnknownHostException uhe) {
log.error("Unknown host: {}", name);
}
return null;
}
private void registerStart(String instanceName, String host, String port) {
// KH - can we cache this for better speed?
InetAddress hostAddress = addressForName(host);
theApplication._lock.startReading();
try {
MInstance instance = ((Application) WOApplication.application()).siteConfig().instanceWithHostAndPort(instanceName, hostAddress, port);
if (instance != null) {
instance.startRegistration(new NSTimestamp());
instance.setShouldDie(false);
} else {
((Application) WOApplication.application()).localMonitor().registerUnknownInstance(instanceName, host, port);
}
} finally {
theApplication._lock.endReading();
}
}
private boolean registerLifebeat(String instanceName, String host, String port) {
// KH - can we cache this for better speed?
InetAddress hostAddress = addressForName(host);
theApplication._lock.startReading();
try {
MInstance instance = ((Application) WOApplication.application()).siteConfig().instanceWithHostAndPort(instanceName, hostAddress, port);
if (instance != null) {
instance.updateRegistration(new NSTimestamp());
// This call will reset shouldDie status!;
return !instance.shouldDieAndReset();
}
((Application) WOApplication.application()).localMonitor().registerUnknownInstance(instanceName, host, port);
} finally {
theApplication._lock.endReading();
}
return true;
}
private void registerStop(String instanceName, String host, String port) {
// app will stop in a good way - we requested it.
InetAddress hostAddress = addressForName(host);
theApplication._lock.startReading();
try {
MInstance instance = ((Application) WOApplication.application()).siteConfig().instanceWithHostAndPort(instanceName, hostAddress, port);
if (instance != null) {
instance.registerStop(new NSTimestamp());
instance.setShouldDie(false);
instance.cancelForceQuitTask();
}
} finally {
theApplication._lock.endReading();
}
}
private void registerCrash(String instanceName, String host, String port) {
NSLog.err.appendln("App '" + instanceName + "' on " + host + ":" + port + " received 'willCrash' notification.");
// app will stop in a bad way - notify if necessary
InetAddress hostAddress = addressForName(host);
theApplication._lock.startReading();
try {
MInstance instance = ((Application) WOApplication.application()).siteConfig().instanceWithHostAndPort(instanceName, hostAddress, port);
if (instance != null) {
instance.registerCrash(new NSTimestamp());
instance.setShouldDie(false);
instance.cancelForceQuitTask();
}
} finally {
theApplication._lock.endReading();
}
}
}