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package.scala
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package.scala
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package org.http4s
package server
import java.util.concurrent.TimeUnit
import scalaz.concurrent.Task
import com.codahale.metrics.MetricRegistry
import com.codahale.metrics.json.MetricsModule
import com.fasterxml.jackson.databind.ObjectMapper
package object metrics {
private val defaultMapper = {
val module = new MetricsModule(TimeUnit.SECONDS, TimeUnit.SECONDS, true)
new ObjectMapper().registerModule(module)
}
/** Encodes a metric registry in JSON format */
def metricRegistryEncoder(mapper: ObjectMapper = defaultMapper): EntityEncoder[MetricRegistry] =
EntityEncoder[String].contramap { metricRegistry =>
val writer = mapper.writerWithDefaultPrettyPrinter()
writer.writeValueAsString(metricRegistry)
}
/** Returns an OK response with a JSON dump of a MetricRegistry */
def metricsResponse(registry: MetricRegistry, mapper: ObjectMapper = defaultMapper): Task[Response] =
Response(Status.Ok).withBody(registry)(metricRegistryEncoder(mapper))
/** Returns an OK response with a JSON dump of a MetricRegistry */
def metricsService(registry: MetricRegistry, mapper: ObjectMapper = defaultMapper): HttpService =
HttpService.lift { req =>
if (req.method == Method.GET) metricsResponse(registry, mapper)
else Response.fallthrough
}
}