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package kamon.instrumentation
import kamon.context.Context
import kamon.testkit.SpanInspection
import org.scalatest.{Matchers, OptionValues, WordSpec}
import scala.collection.mutable
class HttpServerInstrumentationSpec extends WordSpec with Matchers with SpanInspection with OptionValues {
"the HTTP server instrumentation" when {
"configured for context propagation" should {
"read context entries and tags from the incoming request" in {
val httpServer = HttpServer.from("default", port = 8080, "http.server")
val handler = httpServer.handle(fakeRequest("http://localhost:8080/", "/", "GET", Map(
"context-tags" -> "tag=value;none=0011223344556677;",
"custom-trace-id" -> "0011223344556677"
)))
handler.context.tags should contain only(
"tag" -> "value",
"none" -> "0011223344556677"
)
}
"use the configured HTTP propagation channel" in {
val httpServer = HttpServer.from("default", port = 8080, "http.server")
val handler = httpServer.handle(fakeRequest("http://localhost:8080/", "/", "GET", Map(
"context-tags" -> "tag=value;none=0011223344556677;",
"custom-trace-id" -> "0011223344556677"
)))
handler.context.tags should contain only(
"tag" -> "value",
"none" -> "0011223344556677"
)
val span = inspect(handler.span)
span.context().traceID.string shouldNot be("0011223344556677")
span.tag("http.method").value shouldBe "GET"
span.tag("http.url").value shouldBe "http://localhost:8080/"
val responseHeaders = mutable.Map.empty[String, String]
handler.startResponse(fakeResponse(200, responseHeaders), handler.context.withTag("hello", "world"))
}
}
"when all capabilities are disabled" should {
"not read any context from the incoming requests" in {
val httpServer = HttpServer.from("noop", port = 8081, "http.server")
val handler = httpServer.handle(fakeRequest("http://localhost:8080/", "/", "GET", Map(
"context-tags" -> "tag=value;none=0011223344556677;",
"custom-trace-id" -> "0011223344556677"
)))
handler.context shouldBe Context.Empty
}
"not create any span to represent the server request" in {
val httpServer = HttpServer.from("noop", port = 8081, "http.server")
val handler = httpServer.handle(fakeRequest("http://localhost:8080/", "/", "GET", Map(
"context-tags" -> "tag=value;none=0011223344556677;",
"custom-trace-id" -> "0011223344556677"
)))
handler.span.isEmpty() shouldBe true
}
"not record any HTTP server metrics" is (pending)
}
}
def fakeRequest(requestUrl: String, requestPath: String, requestMethod: String, headers: Map[String, String]): HttpRequest =
new HttpRequest {
override def url: String = requestUrl
override def path: String = requestPath
override def method: String = requestMethod
override def readHeader(header: String): Option[String] = headers.get(header)
}
def fakeResponse(responseStatusCode: Int, headers: mutable.Map[String, String]): HttpResponse.Writable[HttpResponse] =
new HttpResponse.Writable[HttpResponse] {
override def statusCode: Int = responseStatusCode
override def writeHeader(header: String, value: String): Unit = headers.put(header, value)
override def build(): HttpResponse = this
}
}
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