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X-B3-TraceId.scala
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X-B3-TraceId.scala
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/*
* Copyright 2013 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s
package headers
import cats.Applicative
import cats.parse.Parser0
import cats.parse.Rfc5234
import cats.syntax.all._
import org.http4s.parser.ZipkinHeader
import org.http4s.util.Renderable
import org.http4s.util.Writer
import org.typelevel.ci._
import java.util.UUID
object `X-B3-TraceId` {
def parse(s: String): ParseResult[`X-B3-TraceId`] =
ParseResult.fromParser(parser, "Invalid X-B3-TraceId header")(s)
private[http4s] val parser: Parser0[`X-B3-TraceId`] = {
val hexValue = Applicative[Parser0].replicateA(16, Rfc5234.hexdig).map { s =>
ZipkinHeader.idStringToLong(s.mkString(""))
}
(hexValue, hexValue.?).mapN(`X-B3-TraceId`(_, _))
}
implicit val headerInstance: Header[`X-B3-TraceId`, Header.Single] =
Header.createRendered(
ci"X-B3-TraceId",
h =>
new Renderable {
def render(writer: Writer): writer.type =
xB3RenderValueImpl(writer, h.idMostSigBits, h.idLeastSigBits)
},
parse,
)
}
final case class `X-B3-TraceId`(idMostSigBits: Long, idLeastSigBits: Option[Long]) {
def asUUID: UUID = new UUID(idMostSigBits, idLeastSigBits.getOrElse(0L))
}