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From justinleet <...@git.apache.org>
Subject [GitHub] incubator-metron pull request #438: METRON-686 Record Rule Set that Fired Du...
Date Thu, 09 Feb 2017 18:18:13 GMT
Github user justinleet commented on a diff in the pull request:

    https://github.com/apache/incubator-metron/pull/438#discussion_r100372924
  
    --- Diff: metron-platform/metron-enrichment/src/main/java/org/apache/metron/threatintel/triage/ThreatTriageProcessor.java
---
    @@ -52,15 +74,36 @@ public ThreatTriageProcessor( SensorEnrichmentConfig config
     
       @Nullable
       @Override
    -  public Double apply(@Nullable Map input) {
    -    List<Number> scores = new ArrayList<>();
    +  public ThreatScore apply(@Nullable Map input) {
    +
    +    ThreatScore threatScore = new ThreatScore();
         StellarPredicateProcessor predicateProcessor = new StellarPredicateProcessor();
    +    StellarProcessor processor = new StellarProcessor();
         VariableResolver resolver = new MapVariableResolver(input, sensorConfig.getConfiguration(),
threatIntelConfig.getConfig());
    +
    +    // attempt to apply each rule to the threat
         for(RiskLevelRule rule : threatTriageConfig.getRiskLevelRules()) {
           if(predicateProcessor.parse(rule.getRule(), resolver, functionResolver, context))
{
    -        scores.add(rule.getScore());
    +
    +        // add the rule's score to the overall threat score
    +        String reason = execute(rule.getReason(), processor, resolver, String.class);
    +        RuleScore score = new RuleScore(rule, reason);
    +        threatScore.addRuleScore(score);
           }
         }
    -    return threatTriageConfig.getAggregator().aggregate(scores, threatTriageConfig.getAggregationConfig());
    +
    +    // calculate the aggregate threat score
    +    Aggregators aggregators = threatTriageConfig.getAggregator();
    +    List<Number> allScores = threatScore.getRuleScores().stream().map(score ->
score.getRule().getScore()).collect(Collectors.toList());
    +    Double aggregateScore = aggregators.aggregate(allScores, threatTriageConfig.getAggregationConfig());
    +
    +    // return the overall threat score
    +    threatScore.setScore(aggregateScore);
    +    return threatScore;
    +  }
    +
    +  private <T> T execute(String expression, StellarProcessor processor, VariableResolver
resolver, Class<T> clazz) {
    +    Object result = processor.parse(expression, resolver, functionResolver, context);
    --- End diff --
    
    This parse() gets called on every message that has "is_alert", correct?  Does that have
any negative perf implications?  My assumption is that parsing every time isn't cheap, but
I'm unsure how expensive it actually is in this context


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