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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.clustercontroller.core;
import com.yahoo.vdslib.state.Node;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.TimeZone;
import java.util.TreeMap;
import java.util.logging.Level;
import java.util.logging.Logger;
public class EventLog implements EventLogInterface {
public static final Logger log = Logger.getLogger(EventLog.class.getName());
private final Timer timer;
private final LinkedList<Event> eventLog = new LinkedList<>();
private final Map<Node, LinkedList<NodeEvent>> nodeLog = new TreeMap<>();
private final MetricUpdater metricUpdater;
private long eventsSeen = 0;
private final long startTime;
private int maxSize = 1024;
private int maxNodeSize = 1024;
private final long recentTimePeriod = 7 * 24 * 60 * 60 * 1000; // millisecs - 1 week
public EventLog(Timer timer, MetricUpdater metricUpdater) {
this.timer = timer;
this.startTime = timer.getCurrentTimeInMillis();
this.metricUpdater = Objects.requireNonNull(metricUpdater, "metricUpdater must be non-null");
}
public void setMaxSize(int size, int nodeSize) {
if (size < 1 || nodeSize < 1) {
throw new IllegalArgumentException("Max size must be at least 1");
}
maxSize = size;
while (eventLog.size() > maxSize) {
eventLog.remove(0);
}
maxNodeSize = nodeSize;
for (List<NodeEvent> list : nodeLog.values()) {
while (list.size() > maxNodeSize) {
list.remove(0);
}
}
}
public long getRecentTimePeriod() { return recentTimePeriod; }
public void add(Event e) { add(e, true); }
public void add(Event e, boolean logInfo) {
++eventsSeen;
eventLog.add(e);
if (eventLog.size() > maxSize) {
eventLog.remove(0);
}
if (e instanceof NodeEvent) {
addNodeOnlyEvent((NodeEvent)e, logInfo ? Level.INFO: Level.FINE);
} else {
log.log(logInfo ? Level.INFO : Level.FINE, e::toString);
}
}
public void addNodeOnlyEvent(NodeEvent e, java.util.logging.Level level) {
log.log(level, "Added node only event: " + e.toString());
metricUpdater.recordNewNodeEvent();
LinkedList<NodeEvent> nodeList = nodeLog.computeIfAbsent(e.getNode().getNode(), k -> new LinkedList<>());
nodeList.add(e);
if (nodeList.size() > maxNodeSize) {
nodeList.remove(0);
}
}
public int getNodeEventsSince(Node n, long time) {
LinkedList<NodeEvent> events = nodeLog.get(n);
int count = 0;
if (events != null) {
Iterator<NodeEvent> it = events.descendingIterator();
while (it.hasNext()) {
NodeEvent e = it.next();
if (e.getTimeMs() < time) break;
++count;
}
}
return count;
}
/** Used in unit testing to verify events generated. */
public List<NodeEvent> getNodeEvents(Node n) {
return new ArrayList<>(nodeLog.get(n));
}
public void writeHtmlState(StringBuilder sb, Node node) {
TimeZone tz = TimeZone.getTimeZone("UTC");
LinkedList<Event> events = new LinkedList<>();
long currentTime = timer.getCurrentTimeInMillis();
long recentNodeEvents = 0;
if (node == null) {
events = eventLog;
sb.append("<h2 id=\"eventlog\">Event log</h2>\n")
.append("<p>A total number of " + eventsSeen + " has been seen since ").append(RealTimer.printDate(startTime, tz)).append(".</p>\n");
} else {
if (nodeLog.containsKey(node)) {
events.addAll(nodeLog.get(node));
}
recentNodeEvents = getNodeEventsSince(node, currentTime - recentTimePeriod);
sb.append("<h2>Node event log for " + node + "</h2>\n")
.append("<p>A total number of " + events.size() + " events has been seen since ")
.append(RealTimer.printDate(startTime, tz)).append(".</p>\n")
.append("<p>Recently, " + recentNodeEvents + " events has been seen since ")
.append(RealTimer.printDate(currentTime - recentTimePeriod, tz)).append(".</p>\n");
}
sb.append("<table border=\"1\" cellspacing=\"0\">\n")
.append("<tr><td>Date (").append(tz.getDisplayName(false, TimeZone.SHORT))
.append(")</td><td>Type</td><td>Node</td><td>Bucket space</td><td>Event</td></tr>\n");
int nr = 0;
Iterator<Event> eventIterator = events.descendingIterator();
while (eventIterator.hasNext()) {
Event e = eventIterator.next();
String colStart = "<font color=\"" + (++nr > recentNodeEvents ? "grey" : "black") + "\">";
String colEnd = "</font>";
sb.append("<tr>\n");
addNobrTableCell(sb, colStart, colEnd, RealTimer.printDate(e.getTimeMs(), tz));
addNobrTableCell(sb, colStart, colEnd, e.getCategory());
if (e instanceof NodeEvent nodeEvent) {
addNobrTableCell(sb, colStart, colEnd, nodeEvent.getNode().toString());
addNobrTableCell(sb, colStart, colEnd, nodeEvent.getBucketSpace().orElse(" - "));
} else {
addNobrTableCell(sb, colStart, colEnd, " - ");
addNobrTableCell(sb, colStart, colEnd, " - ");
}
addTableCell(sb, colStart, colEnd, e.getDescription());
sb.append("</tr>\n");
}
sb.append("</table>\n");
}
private static void addNobrTableCell(StringBuilder sb, String colStart, String colEnd, String cellValue) {
sb.append(" <td><nobr>").append(colStart).append(cellValue).append(colEnd).append("</nobr></td>\n");
}
private static void addTableCell(StringBuilder sb, String colStart, String colEnd, String cellValue) {
sb.append(" <td>").append(colStart).append(cellValue).append(colEnd).append("</td>\n");
}
}
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