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caliban.QuickRequestHandler.scala Maven / Gradle / Ivy
package caliban
import caliban.Configurator.ExecutionConfiguration
import caliban.HttpUtils.{ DeferMultipart, ServerSentEvents }
import caliban.ResponseValue.StreamValue
import caliban.interop.jsoniter.ValueJsoniter
import caliban.uploads.{ FileMeta, GraphQLUploadRequest, Uploads }
import caliban.wrappers.Caching
import caliban.ws.Protocol
import com.github.plokhotnyuk.jsoniter_scala.core._
import com.github.plokhotnyuk.jsoniter_scala.macros.JsonCodecMaker
import zio._
import zio.http.ChannelEvent.UserEvent.HandshakeComplete
import zio.http._
import zio.stacktracer.TracingImplicits.disableAutoTrace
import zio.stream.{ UStream, ZPipeline, ZStream }
import java.nio.charset.StandardCharsets.UTF_8
import scala.util.Try
import scala.util.control.NonFatal
final private class QuickRequestHandler[R](
interpreter: GraphQLInterpreter[R, Any],
wsConfig: quick.WebSocketConfig[R]
) {
import QuickRequestHandler._
def configure(config: ExecutionConfiguration)(implicit trace: Trace): QuickRequestHandler[R] =
new QuickRequestHandler[R](
interpreter.wrapExecutionWith[R, Any](Configurator.ref.locally(config)(_)),
wsConfig
)
def configure[R1](configurator: QuickAdapter.Configurator[R1])(implicit
trace: Trace
): QuickRequestHandler[R & R1] =
new QuickRequestHandler[R & R1](
interpreter.wrapExecutionWith[R & R1, Any](exec => ZIO.scoped[R1 & R](configurator *> exec)),
wsConfig
)
def configureWebSocket[R1](config: quick.WebSocketConfig[R1]): QuickRequestHandler[R & R1] =
new QuickRequestHandler[R & R1](interpreter, config)
def handleHttpRequest(request: Request)(implicit trace: Trace): URIO[R, Response] = ZIO.suspendSucceed {
transformHttpRequest(request)
.flatMap(executeRequest(request.method, _))
.foldZIO(
Exit.succeed,
resp => Exit.succeed(transformResponse(request, resp))
)
}
def handleUploadRequest(request: Request)(implicit trace: Trace): URIO[R, Response] = ZIO.suspendSucceed {
transformUploadRequest(request).flatMap { case (req, fileHandle) =>
executeRequest(request.method, req).provideSomeLayer[R](fileHandle)
}.foldZIO(
Exit.succeed,
v => Exit.succeed(transformResponse(request, v))
)
}
def handleWebSocketRequest(request: Request)(implicit trace: Trace): URIO[R, Response] =
Response.fromSocketApp {
val protocol = request.headers.get(Header.SecWebSocketProtocol) match {
case Some(value) => Protocol.fromName(value.renderedValue)
case None => Protocol.Legacy
}
Handler
.webSocket(webSocketChannelListener(protocol))
.withConfig(wsConfig.zHttpConfig.subProtocol(Some(protocol.name)))
}
private def transformHttpRequest(httpReq: Request)(implicit trace: Trace): IO[Response, GraphQLRequest] = {
def decodeQueryParams(queryParams: QueryParams): Either[Response, GraphQLRequest] = {
def extractField(key: String) =
try Right(queryParams.getAll(key).headOption.map(readFromString[InputValue.ObjectValue](_).fields))
catch { case NonFatal(_) => Left(badRequest(s"Invalid $key query param")) }
for {
vars <- extractField("variables")
exts <- extractField("extensions")
} yield GraphQLRequest(
query = queryParams.getAll("query").headOption,
operationName = queryParams.getAll("operationName").headOption,
variables = vars,
extensions = exts
)
}
def checkNonEmptyRequest(r: GraphQLRequest): IO[Response, GraphQLRequest] =
if (!r.isEmpty) Exit.succeed(r) else Exit.fail(EmptyRequestErrorResponse)
def decodeBody(body: Body) = {
def decodeApplicationGql() =
body.asString.mapBoth(_ => BodyDecodeErrorResponse, b => GraphQLRequest(Some(b)))
def decodeJson(): ZIO[Any, Response, GraphQLRequest] =
body.asArray.foldZIO(
_ => Exit.fail(BodyDecodeErrorResponse),
arr =>
try checkNonEmptyRequest(readFromArray[GraphQLRequest](arr))
catch { case NonFatal(_) => Exit.fail(BodyDecodeErrorResponse) }
)
val isApplicationGql =
httpReq.body.mediaType.exists { mt =>
mt.subType.equalsIgnoreCase("graphql") &&
mt.mainType.equalsIgnoreCase("application")
}
if (isApplicationGql) decodeApplicationGql() else decodeJson()
}
val queryParams = httpReq.url.queryParams
if ((httpReq.method eq Method.GET) || queryParams.hasQueryParam("query")) {
decodeQueryParams(queryParams).fold(Exit.fail, checkNonEmptyRequest)
} else {
val req = decodeBody(httpReq.body)
if (isFtv1Request(httpReq)) req.map(_.withFederatedTracing)
else req
}
}
private def transformUploadRequest(
request: Request
)(implicit trace: Trace): IO[Response, (GraphQLRequest, ULayer[Uploads])] = {
def extractField[A](
partsMap: Map[String, FormField],
key: String
)(implicit jsonValueCodec: JsonValueCodec[A]): IO[Response, A] =
Exit
.fromOption(partsMap.get(key))
.flatMap(_.asChunk)
.flatMap(v => Exit.fromTry(Try(readFromArray[A](v.toArray))))
.orElseFail(Response.badRequest)
def parsePath(path: String): List[PathValue] = path.split('.').toList.map(PathValue.parse)
for {
partsMap <- request.body.asMultipartForm.mapBoth(_ => Response.internalServerError, _.map)
gqlReq <- extractField[GraphQLRequest](partsMap, "operations")
rawMap <- extractField[Map[String, List[String]]](partsMap, "map")
filePaths = rawMap.map { case (key, value) => (key, value.map(parsePath)) }.toList
.flatMap(kv => kv._2.map(kv._1 -> _))
handler = Uploads.handler(handle =>
(for {
uuid <- Random.nextUUID
fp <- ZIO.fromOption(partsMap.get(handle))
body <- fp.asChunk
} yield FileMeta(
uuid.toString,
body.toArray,
Some(fp.contentType.fullType),
fp.filename.getOrElse(""),
body.length
)).option
)
uploadQuery = GraphQLUploadRequest(gqlReq, filePaths, handler)
query = if (isFtv1Request(request)) uploadQuery.remap.withFederatedTracing else uploadQuery.remap
} yield query -> ZLayer(uploadQuery.fileHandle)
}
private def executeRequest(method: Method, req: GraphQLRequest)(implicit
trace: Trace
): ZIO[R, Response, GraphQLResponse[Any]] = {
val calibanMethod = if (method == Method.GET) HttpRequestMethod.GET else HttpRequestMethod.POST
HttpRequestMethod.setWith(calibanMethod)(interpreter.executeRequest(req))
}
private def responseHeaders(headers: Headers, cacheDirective: Option[String]): Headers =
cacheDirective match {
case None => headers
case Some(h) => headers.addHeader(Header.CacheControl.name, h)
}
private def transformResponse(httpReq: Request, resp: GraphQLResponse[Any])(implicit trace: Trace): Response = {
val accepts = new HttpUtils.AcceptsGqlEncodings(httpReq.headers.get(Header.Accept.name))
val cacheDirective = resp.extensions.flatMap(HttpUtils.computeCacheDirective)
resp match {
case resp @ GraphQLResponse(StreamValue(stream), _, _, _) =>
Response(
Status.Ok,
headers = responseHeaders(ContentTypeMultipart, None),
body = Body.fromStreamChunked(encodeMultipartMixedResponse(resp, stream))
)
case resp if accepts.serverSentEvents =>
Response.fromServerSentEvents(encodeTextEventStream(resp))
case resp if accepts.graphQLJson =>
val isBadRequest = resp.errors.exists {
case _: CalibanError.ParsingError | _: CalibanError.ValidationError => true
case _ => false
}
Response(
status = if (isBadRequest) Status.BadRequest else Status.Ok,
headers = responseHeaders(ContentTypeGql, cacheDirective),
body =
encodeSingleResponse(resp, keepDataOnErrors = !isBadRequest, hasCacheDirective = cacheDirective.isDefined)
)
case resp =>
val isBadRequest = resp.errors.contains(HttpRequestMethod.MutationOverGetError)
Response(
status = if (isBadRequest) Status.BadRequest else Status.Ok,
headers = responseHeaders(ContentTypeJson, cacheDirective),
body = encodeSingleResponse(resp, keepDataOnErrors = true, hasCacheDirective = cacheDirective.isDefined)
)
}
}
private def encodeSingleResponse(
resp: GraphQLResponse[Any],
keepDataOnErrors: Boolean,
hasCacheDirective: Boolean
): Body = {
val excludeExtensions = if (hasCacheDirective) Some(Set(Caching.DirectiveName)) else None
Body.fromArray(writeToArray(resp.toResponseValue(keepDataOnErrors, excludeExtensions)))
}
private def encodeMultipartMixedResponse(
resp: GraphQLResponse[Any],
stream: ZStream[Any, Throwable, ResponseValue]
)(implicit trace: Trace): ZStream[Any, Throwable, Byte] = {
import HttpUtils.DeferMultipart._
val pipeline = createPipeline(resp)
stream
.via(pipeline)
.map(writeToArray(_))
.intersperse(InnerBoundary.getBytes(UTF_8), InnerBoundary.getBytes(UTF_8), EndBoundary.getBytes(UTF_8))
.mapConcatChunk(Chunk.fromArray)
}
private def encodeTextEventStream(resp: GraphQLResponse[Any])(implicit trace: Trace): UStream[ServerSentEvent] =
ServerSentEvents.transformResponse(
resp,
v => ServerSentEvent(writeToString(v), Some("next")),
CompleteSse
)
private def isFtv1Request(req: Request) =
req.headers.get(GraphQLRequest.`apollo-federation-include-trace`) match {
case None => false
case Some(h) => h.equalsIgnoreCase(GraphQLRequest.ftv1)
}
private def webSocketChannelListener(protocol: Protocol)(ch: WebSocketChannel)(implicit trace: Trace): RIO[R, Unit] =
for {
queue <- Queue.unbounded[GraphQLWSInput]
pipe <- protocol.make(interpreter, wsConfig.keepAliveTime, wsConfig.hooks).map(ZPipeline.fromFunction(_))
out = ZStream
.fromQueueWithShutdown(queue)
.via(pipe)
.interruptWhen(ch.awaitShutdown)
.map {
case Right(output) => WebSocketFrame.Text(writeToString(output))
case Left(close) => WebSocketFrame.Close(close.code, Some(close.reason))
}
_ <- ZIO.scoped(ch.receiveAll {
case ChannelEvent.UserEventTriggered(HandshakeComplete) =>
out.runForeach(frame => ch.send(ChannelEvent.Read(frame))).forkScoped
case ChannelEvent.Read(WebSocketFrame.Text(text)) =>
ZIO.suspend(queue.offer(readFromString[GraphQLWSInput](text)))
case _ =>
ZIO.unit
})
} yield ()
}
object QuickRequestHandler {
private def badRequest(msg: String) =
Response(Status.BadRequest, body = Body.fromString(msg))
private val ContentTypeJson =
Headers(Header.ContentType(MediaType.application.json).untyped)
private val ContentTypeGql =
Headers(Header.ContentType(MediaType("application", "graphql-response+json")).untyped)
private val ContentTypeMultipart =
Headers(Header.ContentType(MediaType.multipart.mixed.copy(parameters = DeferMultipart.DeferHeaderParams)).untyped)
private val CompleteSse = ServerSentEvent("", Some("complete"))
private val BodyDecodeErrorResponse =
badRequest("Failed to decode json body")
private val EmptyRequestErrorResponse =
badRequest("No GraphQL query to execute")
private implicit val inputObjectCodec: JsonValueCodec[InputValue.ObjectValue] =
new JsonValueCodec[InputValue.ObjectValue] {
private val inputValueCodec = ValueJsoniter.inputValueCodec
override def decodeValue(in: JsonReader, default: InputValue.ObjectValue): InputValue.ObjectValue =
inputValueCodec.decodeValue(in, default) match {
case o: InputValue.ObjectValue => o
case _ => in.decodeError("expected json object")
}
override def encodeValue(x: InputValue.ObjectValue, out: JsonWriter): Unit =
inputValueCodec.encodeValue(x, out)
override def nullValue: InputValue.ObjectValue =
null.asInstanceOf[InputValue.ObjectValue]
}
private implicit val responseCodec: JsonValueCodec[ResponseValue] = ValueJsoniter.responseValueCodec
private implicit val stringListCodec: JsonValueCodec[Map[String, List[String]]] = JsonCodecMaker.make
}
