com.wavefront.agent.preprocessor.ReportPointForceLowercaseTransformer Maven / Gradle / Ivy
package com.wavefront.agent.preprocessor;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import java.util.function.Predicate;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
import wavefront.report.ReportPoint;
/**
* Force lowercase transformer. Converts a specified component of a point (metric name, source name
* or a point tag value, depending on "scope" parameter) to lower case to enforce consistency.
*
* @author [email protected]
*/
public class ReportPointForceLowercaseTransformer implements Function {
private final String scope;
@Nullable private final Pattern compiledMatchPattern;
private final PreprocessorRuleMetrics ruleMetrics;
private final Predicate v2Predicate;
public ReportPointForceLowercaseTransformer(
final String scope,
@Nullable final String patternMatch,
@Nullable Predicate v2Predicate,
final PreprocessorRuleMetrics ruleMetrics) {
this.scope = Preconditions.checkNotNull(scope, "[scope] can't be null");
Preconditions.checkArgument(!scope.isEmpty(), "[scope] can't be blank");
this.compiledMatchPattern = patternMatch != null ? Pattern.compile(patternMatch) : null;
Preconditions.checkNotNull(ruleMetrics, "PreprocessorRuleMetrics can't be null");
this.ruleMetrics = ruleMetrics;
this.v2Predicate = v2Predicate != null ? v2Predicate : x -> true;
}
@Nullable
@Override
public ReportPoint apply(@Nullable ReportPoint reportPoint) {
if (reportPoint == null) return null;
long startNanos = ruleMetrics.ruleStart();
try {
if (!v2Predicate.test(reportPoint)) return reportPoint;
switch (scope) {
case "metricName":
if (compiledMatchPattern != null
&& !compiledMatchPattern.matcher(reportPoint.getMetric()).matches()) {
break;
}
reportPoint.setMetric(reportPoint.getMetric().toLowerCase());
ruleMetrics.incrementRuleAppliedCounter();
break;
case "sourceName": // source name is not case sensitive in Wavefront, but we'll do it anyway
if (compiledMatchPattern != null
&& !compiledMatchPattern.matcher(reportPoint.getHost()).matches()) {
break;
}
reportPoint.setHost(reportPoint.getHost().toLowerCase());
ruleMetrics.incrementRuleAppliedCounter();
break;
default:
if (reportPoint.getAnnotations() != null) {
String tagValue = reportPoint.getAnnotations().get(scope);
if (tagValue != null) {
if (compiledMatchPattern != null
&& !compiledMatchPattern.matcher(tagValue).matches()) {
break;
}
reportPoint.getAnnotations().put(scope, tagValue.toLowerCase());
ruleMetrics.incrementRuleAppliedCounter();
}
}
}
return reportPoint;
} finally {
ruleMetrics.ruleEnd(startNanos);
}
}
}