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package kamon
package metric
import java.util.regex.Pattern
import com.typesafe.config.Config
object EntityFilter {
def fromConfig(config: Config): EntityFilter = {
val filtersConfig = config.getConfig("kamon.metric.filters")
val acceptUnmatched = filtersConfig.getBoolean("accept-unmatched")
val perCategoryFilters = filtersConfig.firstLevelKeys.filter(_ != "accept-unmatched") map { category: String ⇒
val includes = readFilters(filtersConfig, s"$category.includes")
val excludes = readFilters(filtersConfig, s"$category.excludes")
(category, new IncludeExcludeNameFilter(includes, excludes, acceptUnmatched))
} toMap
new EntityFilter(perCategoryFilters, acceptUnmatched)
}
private def readFilters(filtersConfig: Config, name: String): Seq[NameFilter] = {
import scala.collection.JavaConverters._
if(filtersConfig.hasPath(name))
filtersConfig.getStringList(name).asScala.map(readNameFilter)
else
Seq.empty
}
private def readNameFilter(pattern: String): NameFilter = {
if(pattern.startsWith("regex:"))
new RegexNameFilter(pattern.drop(6))
else if(pattern.startsWith("glob:"))
new GlobPathFilter(pattern.drop(5))
else
new GlobPathFilter(pattern)
}
}
class EntityFilter(perCategoryFilters: Map[String, NameFilter], acceptUnmatched: Boolean) {
def accept(entity: Entity): Boolean =
perCategoryFilters
.get(entity.category)
.map(_.accept(entity.name))
.getOrElse(acceptUnmatched)
}
trait NameFilter {
def accept(name: String): Boolean
}
class IncludeExcludeNameFilter(includes: Seq[NameFilter], excludes: Seq[NameFilter], acceptUnmatched: Boolean) extends NameFilter {
override def accept(name: String): Boolean =
(includes.exists(_.accept(name)) || acceptUnmatched) && !excludes.exists(_.accept(name))
}
class RegexNameFilter(path: String) extends NameFilter {
private val pathRegex = path.r
override def accept(path: String): Boolean = path match {
case pathRegex(_*) ⇒ true
case _ ⇒ false
}
}
class GlobPathFilter(glob: String) extends NameFilter {
private val globPattern = Pattern.compile("(\\*\\*?)|(\\?)|(\\\\.)|(/+)|([^*?]+)")
private val compiledPattern = getGlobPattern(glob)
override def accept(name: String): Boolean =
compiledPattern.matcher(name).matches()
private def getGlobPattern(glob: String) = {
val patternBuilder = new StringBuilder
val matcher = globPattern.matcher(glob)
while (matcher.find()) {
val (grp1, grp2, grp3, grp4) = (matcher.group(1), matcher.group(2), matcher.group(3), matcher.group(4))
if (grp1 != null) {
// match a * or **
if (grp1.length == 2) {
// it's a *workers are able to process multiple metrics*
patternBuilder.append(".*")
}
else {
// it's a *
patternBuilder.append("[^/]*")
}
}
else if (grp2 != null) {
// match a '?' glob pattern; any non-slash character
patternBuilder.append("[^/]")
}
else if (grp3 != null) {
// backslash-escaped value
patternBuilder.append(Pattern.quote(grp3.substring(1)))
}
else if (grp4 != null) {
// match any number of / chars
patternBuilder.append("/+")
}
else {
// some other string
patternBuilder.append(Pattern.quote(matcher.group))
}
}
Pattern.compile(patternBuilder.toString)
}
}
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