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/*
* Copyright (C) 2020 Graylog, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* .
*/
package org.graylog2.streams;
import com.codahale.metrics.Timer;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.google.common.util.concurrent.SimpleTimeLimiter;
import com.google.common.util.concurrent.TimeLimiter;
import com.google.common.util.concurrent.UncheckedTimeoutException;
import com.google.inject.assistedinject.Assisted;
import org.graylog2.plugin.Message;
import org.graylog2.plugin.streams.DefaultStream;
import org.graylog2.plugin.streams.Stream;
import org.graylog2.plugin.streams.StreamRule;
import org.graylog2.plugin.streams.StreamRuleType;
import org.graylog2.streams.matchers.StreamRuleMatcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import javax.inject.Inject;
import javax.inject.Provider;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;
/**
* Stream routing engine to select matching streams for a message.
*
* This class is NOT thread-safe! Use one instance per thread.
*/
public class StreamRouterEngine {
private static final Logger LOG = LoggerFactory.getLogger(StreamRouterEngine.class);
private final EnumSet ruleTypesNotNeedingFieldPresence = EnumSet.of(StreamRuleType.PRESENCE, StreamRuleType.EXACT, StreamRuleType.REGEX, StreamRuleType.ALWAYS_MATCH, StreamRuleType.CONTAINS, StreamRuleType.MATCH_INPUT);
private final List streams;
private final StreamFaultManager streamFaultManager;
private final StreamMetrics streamMetrics;
private final TimeLimiter timeLimiter;
private final long streamProcessingTimeout;
private final String fingerprint;
private final Provider defaultStreamProvider;
private final List rulesList;
public interface Factory {
StreamRouterEngine create(List streams, ExecutorService executorService);
}
@Inject
public StreamRouterEngine(@Assisted List streams,
@Assisted ExecutorService executorService,
StreamFaultManager streamFaultManager,
StreamMetrics streamMetrics,
@DefaultStream Provider defaultStreamProvider) {
this.streams = streams;
this.streamFaultManager = streamFaultManager;
this.streamMetrics = streamMetrics;
this.timeLimiter = SimpleTimeLimiter.create(executorService);
this.streamProcessingTimeout = streamFaultManager.getStreamProcessingTimeout();
this.fingerprint = new StreamListFingerprint(streams).getFingerprint();
this.defaultStreamProvider = defaultStreamProvider;
final List alwaysMatchRules = Lists.newArrayList();
final List presenceRules = Lists.newArrayList();
final List exactRules = Lists.newArrayList();
final List greaterRules = Lists.newArrayList();
final List smallerRules = Lists.newArrayList();
final List regexRules = Lists.newArrayList();
final List containsRules = Lists.newArrayList();
final List matchInputRules = Lists.newArrayList();
for (Stream stream : streams) {
for (StreamRule streamRule : stream.getStreamRules()) {
final Rule rule;
try {
rule = new Rule(stream, streamRule, stream.getMatchingType());
} catch (InvalidStreamRuleTypeException e) {
LOG.warn("Invalid stream rule type. Skipping matching for this rule. " + e.getMessage(), e);
continue;
}
switch (streamRule.getType()) {
case ALWAYS_MATCH:
alwaysMatchRules.add(rule);
break;
case PRESENCE:
presenceRules.add(rule);
break;
case EXACT:
exactRules.add(rule);
break;
case GREATER:
greaterRules.add(rule);
break;
case SMALLER:
smallerRules.add(rule);
break;
case REGEX:
regexRules.add(rule);
break;
case CONTAINS:
containsRules.add(rule);
break;
case MATCH_INPUT:
matchInputRules.add(rule);
break;
}
}
}
final int size = alwaysMatchRules.size() + presenceRules.size() + exactRules.size() + greaterRules.size() + smallerRules.size() + containsRules.size() + regexRules.size() + matchInputRules.size();
this.rulesList = Lists.newArrayListWithCapacity(size);
this.rulesList.addAll(alwaysMatchRules);
this.rulesList.addAll(presenceRules);
this.rulesList.addAll(exactRules);
this.rulesList.addAll(matchInputRules);
this.rulesList.addAll(greaterRules);
this.rulesList.addAll(smallerRules);
this.rulesList.addAll(containsRules);
this.rulesList.addAll(regexRules);
}
/**
* Returns the list of streams that are processed by the engine.
*
* @return the list of streams
*/
public List getStreams() {
return streams;
}
/**
* Returns the fingerprint of the engine instance.
*
* @return the fingerprint
*/
public String getFingerprint() {
return fingerprint;
}
/**
* Returns a list of matching streams for the given message.
*
* @param message the message
* @return the list of matching streams
*/
public List match(Message message) {
final Set result = Sets.newHashSet();
final Set blackList = Sets.newHashSet();
for (final Rule rule : rulesList) {
if (blackList.contains(rule.getStreamId())) {
continue;
}
final StreamRule streamRule = rule.getStreamRule();
final StreamRuleType streamRuleType = streamRule.getType();
final Stream.MatchingType matchingType = rule.getMatchingType();
if (!ruleTypesNotNeedingFieldPresence.contains(streamRuleType)
&& !message.hasField(streamRule.getField())) {
if (matchingType == Stream.MatchingType.AND) {
result.remove(rule.getStream());
// blacklist stream because it can't match anymore
blackList.add(rule.getStreamId());
}
continue;
}
final Stream stream;
if (streamRuleType != StreamRuleType.REGEX) {
stream = rule.match(message);
} else {
stream = rule.matchWithTimeOut(message, streamProcessingTimeout, TimeUnit.MILLISECONDS);
}
if (stream == null) {
if (matchingType == Stream.MatchingType.AND) {
result.remove(rule.getStream());
// blacklist stream because it can't match anymore
blackList.add(rule.getStreamId());
}
} else {
result.add(stream);
if (matchingType == Stream.MatchingType.OR) {
// blacklist stream because it is already matched
blackList.add(rule.getStreamId());
}
}
}
final Stream defaultStream = defaultStreamProvider.get();
boolean alreadyRemovedDefaultStream = false;
for (Stream stream : result) {
streamMetrics.markIncomingMeter(stream.getId());
if (stream.getRemoveMatchesFromDefaultStream()) {
if (alreadyRemovedDefaultStream || message.removeStream(defaultStream)) {
alreadyRemovedDefaultStream = true;
if (LOG.isTraceEnabled()) {
LOG.trace("Successfully removed default stream <{}> from message <{}>", defaultStream.getId(), message.getId());
}
} else {
if (LOG.isWarnEnabled()) {
LOG.warn("Couldn't remove default stream <{}> from message <{}>", defaultStream.getId(), message.getId());
}
}
}
}
// either the message stayed on the default stream, in which case we mark that stream's throughput,
// or someone removed it, in which case we don't mark it.
if (!alreadyRemovedDefaultStream) {
streamMetrics.markIncomingMeter(defaultStream.getId());
}
return ImmutableList.copyOf(result);
}
/**
* Returns a list of stream rule matches. Can be used to test streams and stream rule matches.
* This is meant for testing, do NOT use in production processing pipeline! (use {@link #match(org.graylog2.plugin.Message) match} instead)
*
* @param message the message to match streams on
*/
public List testMatch(Message message) {
final List matches = Lists.newArrayList();
for (final Stream stream : streams) {
final StreamTestMatch match = new StreamTestMatch(stream);
for (final StreamRule streamRule : stream.getStreamRules()) {
try {
final Rule rule = new Rule(stream, streamRule, stream.getMatchingType());
match.addRule(rule);
} catch (InvalidStreamRuleTypeException e) {
LOG.warn("Invalid stream rule type. Skipping matching for this rule. " + e.getMessage(), e);
}
}
match.matchMessage(message);
matches.add(match);
}
return matches;
}
private class Rule {
private final Stream stream;
private final StreamRule rule;
private final String streamId;
private final String streamRuleId;
private final StreamRuleMatcher matcher;
private final Stream.MatchingType matchingType;
public Rule(Stream stream, StreamRule rule, Stream.MatchingType matchingType) throws InvalidStreamRuleTypeException {
this.stream = stream;
this.rule = rule;
this.streamId = stream.getId();
this.streamRuleId = rule.getId();
this.matchingType = matchingType;
this.matcher = StreamRuleMatcherFactory.build(rule.getType());
}
public Stream.MatchingType getMatchingType() {
return matchingType;
}
@Nullable
public Stream match(Message message) {
// TODO Add missing message recordings!
try (final Timer.Context ignored = streamMetrics.getExecutionTimer(streamId, streamRuleId).time()) {
if (matcher.match(message, rule)) {
return stream;
} else {
return null;
}
} catch (Exception e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Error matching stream rule <" + rule.getType() + "/" + rule.getValue() + ">: " + e.getMessage(), e);
}
streamMetrics.markExceptionMeter(streamId);
return null;
}
}
@Nullable
private Stream matchWithTimeOut(final Message message, long timeout, TimeUnit unit) {
Stream matchedStream = null;
try (final Timer.Context ignored = streamMetrics.getExecutionTimer(streamId, streamRuleId).time()) {
matchedStream = timeLimiter.callWithTimeout(new Callable() {
@Override
@Nullable
public Stream call() throws Exception {
return match(message);
}
}, timeout, unit);
} catch (UncheckedTimeoutException e) {
streamFaultManager.registerFailure(stream);
} catch (Exception e) {
LOG.warn("Unexpected error during stream matching", e);
streamMetrics.markExceptionMeter(streamId);
}
return matchedStream;
}
public StreamRule getStreamRule() {
return rule;
}
public Stream getStream() {
return stream;
}
public String getStreamId() {
return streamId;
}
}
/**
* Contains matching results for a stream. This is useful for testing to see if a stream matches and which
* rules matched.
*/
public static class StreamTestMatch {
private final Stream stream;
private final List rules = Lists.newArrayList();
private final Stream.MatchingType matchingType;
private final Map matches = Maps.newHashMap();
public StreamTestMatch(Stream stream) {
this.stream = stream;
this.matchingType = stream.getMatchingType();
}
public void addRule(Rule rule) {
rules.add(rule);
}
public void matchMessage(Message message) {
for (Rule rule : rules) {
final Stream match = rule.match(message);
matches.put(rule.getStreamRule(), match != null && match.equals(stream));
}
}
public boolean isMatched() {
switch (matchingType) {
case OR:
return matches.values().contains(true);
case AND:
default:
return matches.size() > 0 && !matches.values().contains(false);
}
}
public Stream getStream() {
return stream;
}
public Map getMatches() {
return matches;
}
}
}
