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package kamon.context
import java.nio.ByteBuffer
import kamon.Kamon
import kamon.testkit.ContextTesting
import org.scalatest.{Matchers, OptionValues, WordSpec}
class ContextCodecSpec extends WordSpec with Matchers with ContextTesting with OptionValues {
"the Context Codec" when {
"encoding/decoding to HttpHeaders" should {
"round trip a empty context" in {
val textMap = ContextCodec.HttpHeaders.encode(Context.Empty)
val decodedContext = ContextCodec.HttpHeaders.decode(textMap)
decodedContext shouldBe Context.Empty
}
"round trip a context with only local keys" in {
val localOnlyContext = Context.create(StringKey, Some("string-value"))
val textMap = ContextCodec.HttpHeaders.encode(localOnlyContext)
val decodedContext = ContextCodec.HttpHeaders.decode(textMap)
decodedContext shouldBe Context.Empty
}
"round trip a context with local and broadcast keys" in {
val initialContext = Context.create()
.withKey(StringKey, Some("string-value"))
.withKey(StringBroadcastKey, Some("this-should-be-round-tripped"))
val textMap = ContextCodec.HttpHeaders.encode(initialContext)
val decodedContext = ContextCodec.HttpHeaders.decode(textMap)
decodedContext.get(StringKey) shouldBe empty
decodedContext.get(StringBroadcastKey).value shouldBe "this-should-be-round-tripped"
}
}
"encoding/decoding to Binary" should {
"round trip a empty context" in {
val byteBuffer = ContextCodec.Binary.encode(Context.Empty)
val decodedContext = ContextCodec.Binary.decode(byteBuffer)
decodedContext shouldBe Context.Empty
}
"round trip a context with only local keys" in {
val localOnlyContext = Context.create(StringKey, Some("string-value"))
val byteBuffer = ContextCodec.Binary.encode(localOnlyContext)
val decodedContext = ContextCodec.Binary.decode(byteBuffer)
decodedContext shouldBe Context.Empty
}
"round trip a context with local and broadcast keys" in {
val initialContext = Context.create()
.withKey(StringKey, Some("string-value"))
.withKey(StringBroadcastKey, Some("this-should-be-round-tripped"))
val byteBuffer = ContextCodec.Binary.encode(initialContext)
val decodedContext = ContextCodec.Binary.decode(byteBuffer)
decodedContext.get(StringKey) shouldBe empty
decodedContext.get(StringBroadcastKey).value shouldBe "this-should-be-round-tripped"
}
}
}
val ContextCodec = new Codecs(Kamon.config())
}
object SimpleStringCodec {
final class Headers extends Codecs.ForEntry[TextMap] {
private val dataKey = "X-String-Value"
override def encode(context: Context): TextMap = {
val textMap = TextMap.Default()
context.get(ContextTesting.StringBroadcastKey).foreach { value =>
textMap.put(dataKey, value)
}
textMap
}
override def decode(carrier: TextMap, context: Context): Context = {
carrier.get(dataKey) match {
case value @ Some(_) => context.withKey(ContextTesting.StringBroadcastKey, value)
case None => context
}
}
}
final class Binary extends Codecs.ForEntry[ByteBuffer] {
val emptyBuffer = ByteBuffer.allocate(0)
override def encode(context: Context): ByteBuffer = {
context.get(ContextTesting.StringBroadcastKey) match {
case Some(value) => ByteBuffer.wrap(value.getBytes)
case None => emptyBuffer
}
}
override def decode(carrier: ByteBuffer, context: Context): Context = {
context.withKey(ContextTesting.StringBroadcastKey, Some(new String(carrier.array())))
}
}
}
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