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TestHttpClient.scala
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TestHttpClient.scala
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package japgolly.webapputil.test
import japgolly.univeq._
import japgolly.webapputil.general.Effect._
import japgolly.webapputil.general.LazyVal
import japgolly.webapputil.http.HttpClient.{Module => _, _}
import scala.runtime.AbstractFunction1
import scala.util.{Failure, Success, Try}
object TestHttpClient {
class Module[F[_], A[_]](implicit F: Sync[F], A: Async[A]) {
type Req = ReqF[F]
type Client = TestHttpClient[F, A]
def apply(autoRespondInitially: Boolean): Client =
new TestHttpClient(autoRespondInitially)
}
object Module {
def apply[F[_], A[_]](implicit F: Sync[F], A: Async[A]): Module[F, A] =
new Module
}
trait ReqF[F[_]] {
val request : Request
val onResponse: Either[Throwable, Response] => F[Unit]
val respond : ResponseDsl[F[Unit]]
override def toString =
"Req[%08X]:%s(%s)".format(
##,
request.uri,
if (request.uriParams.nonEmpty) request.uriParams.toString else request.body.toString
)
private var _pendingResponse = true
final def responsePending = _pendingResponse
final def responded = !responsePending
def markAsResponded(): Unit =
if (responsePending)
_pendingResponse = false
else
throw new java.lang.IllegalStateException("Request has already been responded to.")
}
abstract class ResponseDsl[+A] {
def withResponseAttempt(r: Either[Throwable, Response]): A
final def apply(body : String = "",
contentType: String = null,
headers : Headers = Headers.empty,
status : Status = Status(200),
): A =
withResponse(Response(
status,
LazyVal.pure(ResponseBody(body, Option(contentType))),
headers,
))
final def withResponse(r: Response): A =
withResponseAttempt(Right(r))
final def withException(err: Throwable = new RuntimeException("Dummy exception from TestHttpClient")): A =
withResponseAttempt(Left(err))
}
var defaultTimeoutMs = 4000
}
// =====================================================================================================================
class TestHttpClient[F[_], A[_]](autoRespondInitially: Boolean)
(implicit F: Sync[F], A: Async[A]) extends AbstractFunction1[Request, A[Response]] {
import TestHttpClient._
type Req = ReqF[F]
var reqs: Vector[Req] =
Vector.empty
def last(): Req =
reqs.last
def nthLast(n: Int): Req = {
val l = reqs.length
assert(n >= 1, s"n ($n) must be ≥ 1")
assert(n <= l, s"n ($n) exceeds number of available requests ($l)")
reqs(l - n)
}
def assertReqsSent(expect: Int): Unit = {
val actual = reqs.length
if (actual != expect)
throw new java.lang.AssertionError(s"Expected $expect Http requests but $actual were emited.")
}
def clear(): Unit = {
reqs = Vector.empty
}
def reset(): Unit = {
clear()
autoRespond = autoRespondInitially
autoResponsePFs = Nil
autoResponseFallback = defaultAutoResponseFallback
}
var timeoutMs = -1L
var autoRespond: Boolean =
autoRespondInitially
var autoResponsePFs: List[PartialFunction[Req, F[Unit]]] =
Nil
var autoResponseFallback: Req => F[Unit] =
defaultAutoResponseFallback
protected def defaultAutoResponseFallback: Req => F[Unit] =
r => F.delay(println(s"${Console.YELLOW}Don't know how to respond to $r${Console.RESET}"))
def addAutoResponsePF(f: PartialFunction[Req, F[Unit]]): Unit =
autoResponsePFs :+= f
def addAutoResponse(accept: Req => Boolean)(f: Req => F[Unit]): Unit =
addAutoResponsePF {
case req if accept(req) => f(req)
}
def addAutoResponse(r: Request)(f: Req => F[Unit]): Unit =
addAutoResponse(_.request ==* r)(f)
def autoRespondTo(req: Req): Unit = {
req.markAsResponded()
F.runSync(
autoResponsePFs
.find(_.isDefinedAt(req))
.getOrElse(autoResponseFallback)
.apply(req)
)
}
def autoRespondToLast(): Unit =
autoRespondTo(last())
// Override to modify or register each request that passes through
protected def onReq(req: Req): Req =
req
override def apply(request: Request): A[Response] = {
val far = prepare(request)
val aar = A.delay(F.runSync(far))
A.flatten(aar)
}
def prepare(req: Request): F[A[Response]] =
F.delay {
var callbacks: List[Try[Response] => Unit] =
Nil
var result: Try[Response] =
null
def reactNow(): Unit = {
if (result ne null)
callbacks.foreach(_(result))
}
def newReq(): Unit = {
val r = onReq(new ReqF[F] { self =>
override val request = req
override val onResponse = i => F.delay {
result = i.fold(Failure(_), Success(_))
reactNow()
}
override val respond =
new ResponseDsl[F[Unit]] {
override def withResponseAttempt(r: Either[Throwable, Response]): F[Unit] =
self.onResponse(r)
}
})
reqs :+= r
if (autoRespond)
autoRespondToLast()
}
val main =
A.async[Response] { f =>
callbacks ::= f
newReq()
}
var timeoutMs = this.timeoutMs
if (timeoutMs < 0)
timeoutMs = TestHttpClient.defaultTimeoutMs
if (timeoutMs <= 0)
main
else
A.timeoutMsOrThrow(timeoutMs, new RuntimeException("TestHttpClient response timed out."))(main)
}
def respondToLast: ResponseDsl[Unit] =
new ResponseDsl[Unit] {
override def withResponseAttempt(r: Either[Throwable, Response]): Unit = {
val req = last()
req.markAsResponded()
F.runSync(req.onResponse(r))
}
}
}