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package org.dcache.alarms.logback;
import ch.qos.logback.classic.spi.ILoggingEvent;
import com.google.common.base.Preconditions;
import org.slf4j.Marker;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;
import dmg.cells.nucleus.CDC;
import org.dcache.alarms.Alarm;
import org.dcache.alarms.AlarmMarkerFactory;
import org.dcache.alarms.LogEntry;
import org.dcache.alarms.PredefinedAlarm;
import org.dcache.util.NDC;
import org.dcache.util.NetworkUtils;
/**
* This class provides the binding between the logback-specific
* event structure, the alarm definition and the DAO storage class.
* It is meant for package-only access.
*
* @author arossi
*/
final class LoggingEventConverter {
private static String getKeyFromMarker(Marker marker) {
Marker keyMarker = AlarmMarkerFactory.getKeySubmarker(marker);
if (keyMarker == null) {
/*
* An untyped event with an ALARM marker has been received.
* Provide a UUID as key.
*/
return UUID.randomUUID().toString();
}
StringBuilder builder = new StringBuilder();
for (Iterator<Marker> it = keyMarker.iterator(); it.hasNext(); ) {
builder.append(it.next().getName());
}
return builder.toString();
}
private static String getTypeFromMarker(Marker marker) {
Marker typeMarker = AlarmMarkerFactory.getTypeSubmarker(marker);
if (typeMarker == null) {
/*
* An untyped event with an ALARM marker has been received.
* Mark the Alarm as GENERIC.
*/
return PredefinedAlarm.GENERIC.toString();
}
Marker alarmType = typeMarker.iterator().next();
Preconditions.checkNotNull(alarmType);
return alarmType.getName();
}
/**
* The only package entry method.
*
* @param event received by appender.
* @return storage object with all metadata set.
*/
LogEntry createEntryFromEvent(ILoggingEvent event) {
Marker marker = event.getMarker();
if (!AlarmMarkerFactory.containsAlarmMarker(marker)) {
throw new IllegalArgumentException(
String.format( "%s did not contain an alarm marker; "
+ "this is a bug.",
event.getFormattedMessage()));
}
Map<String, String> mdc = event.getMDCPropertyMap();
String host = mdc.get(Alarm.HOST_TAG);
if (host == null) {
host = NetworkUtils.getCanonicalHostName();
}
String service = mdc.get(Alarm.SERVICE_TAG);
if (service == null) {
service = mdc.get(CDC.MDC_CELL);
}
String domain = mdc.get(Alarm.DOMAIN_TAG);
if (domain == null) {
domain = mdc.get(CDC.MDC_DOMAIN);
}
String info = event.getFormattedMessage();
String ndc = NDC.ndcFromMdc(mdc);
if (ndc != null && !ndc.isEmpty()) {
info = "[" + ndc + "] " + info;
}
LogEntry entry = new LogEntry();
entry.setInfo(info);
Long timestamp = event.getTimeStamp();
entry.setFirstArrived(timestamp);
entry.setLastUpdate(timestamp);
entry.setHost(host);
entry.setDomain(domain);
entry.setService(service);
/*
* For the moment, we leave the schema and query structure
* alone, even though all future entry objects should be
* marked as alarms.
*/
entry.setAlarm(true);
String type = getTypeFromMarker(marker);
String key = getKeyFromMarker(marker);
entry.setType(type);
entry.setKey(type + ":" + key);
return entry;
}
}