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X-B3-Flags.scala
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X-B3-Flags.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.parse.Numbers
import cats.parse.Parser0
import org.http4s.util.Renderable
import org.http4s.util.Writer
import org.typelevel.ci._
object `X-B3-Flags` {
def parse(s: String): ParseResult[`X-B3-Flags`] =
ParseResult.fromParser(parser, "Invalid X-B3-Flags header")(s)
private[http4s] val parser: Parser0[`X-B3-Flags`] =
Numbers.digits
.mapFilter { str =>
try Some(str.toLong)
catch { case _: NumberFormatException => None }
}
.map(fromLong)
sealed trait Flag extends Product with Serializable {
def longValue: Long
}
object Flag {
case object Debug extends Flag {
override def longValue: Long = 1 << 0
}
case object SamplingSet extends Flag {
override def longValue: Long = 1 << 1
}
case object Sampled extends Flag {
override def longValue: Long = 1 << 2
}
}
private def bitIsSet(bit: Long, flagBits: Long): Boolean =
(flagBits & bit) == bit
// Pure API, despite internal mutation.
def fromLong(flagBits: Long): `X-B3-Flags` = {
var flags: Set[`X-B3-Flags`.Flag] = Set.empty
if (bitIsSet(Flag.Debug.longValue, flagBits))
flags = flags + Flag.Debug
if (bitIsSet(Flag.SamplingSet.longValue, flagBits))
flags = flags + Flag.SamplingSet
if (bitIsSet(Flag.Sampled.longValue, flagBits))
flags = flags + Flag.Sampled
`X-B3-Flags`(flags)
}
implicit val headerInstance: Header[`X-B3-Flags`, Header.Single] =
Header.createRendered(
ci"X-B3-Flags",
h =>
new Renderable {
def render(writer: Writer): writer.type =
writer.append(h.flags.foldLeft(0L)((sum, next) => sum + next.longValue).toString)
},
parse,
)
}
final case class `X-B3-Flags`(flags: Set[`X-B3-Flags`.Flag])