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FieldCollection.scala
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FieldCollection.scala
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/*
* Copyright 2023 Valdemar Grange
*
* 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 gql.preparation
import cats._
import cats.data._
import cats.implicits._
import cats.mtl._
import gql.Arg
import gql.Cursor
import gql.InverseModifierStack
import gql.SchemaShape
import gql.ast._
import gql.parser.QueryAst
import gql.parser.{QueryAst => QA}
import gql.parser.AnyValue
import gql.Position
trait FieldCollection[F[_], G[_], C] {
def matchType(
name: String,
sel: Selectable[G, ?],
caret: C
): F[Selectable[G, ?]]
def collectSelectionInfo(
sel: Selectable[G, ?],
ss: QA.SelectionSet[C]
): F[List[SelectionInfo[G, C]]]
def collectFieldInfo(
qf: AbstractField[G, ?],
f: QA.Field[C],
caret: C
): F[FieldInfo[G, C]]
}
object FieldCollection {
type CycleSet = Set[String]
def apply[F[_]: Parallel, G[_], C](
implementations: SchemaShape.Implementations[G],
fragments: Map[String, QA.FragmentDefinition[C]]
)(implicit
F: Monad[F],
E: ErrorAlg[F, C],
L: Local[F, CycleSet],
C: Local[F, Cursor],
A: ArgParsing[F, C],
DA: DirectiveAlg[F, G, C]
) = {
implicit val PA: PathAlg[F] = PathAlg.pathAlgForLocal[F]
import E._
import PA._
new FieldCollection[F, G, C] {
def inFragment[A](
fragmentName: String,
carets: List[C]
)(faf: QA.FragmentDefinition[C] => F[A]): F[A] =
L.ask[CycleSet]
.map(_.contains(fragmentName))
.ifM(
raise(s"Fragment by '$fragmentName' is cyclic. Hint: graphql queries must be finite.", carets),
fragments.get(fragmentName) match {
case None => raise(s"Unknown fragment name '$fragmentName'.", carets)
case Some(f) => L.local(faf(f))(_ + fragmentName)
}
)
override def matchType(name: String, sel: Selectable[G, ?], caret: C): F[Selectable[G, ?]] = {
if (sel.name == name) F.pure(sel)
else {
sel match {
case t: Type[G, ?] =>
// Check downcast
t.implementsMap.get(name) match {
case None =>
raise(s"Tried to match with type `$name` on type object type `${sel.name}`.", List(caret))
case Some(i) => F.pure(i.value)
}
case i: Interface[G, ?] =>
// What types implement this interface?
// We can both downcast and up-match
i.implementsMap.get(name) match {
case Some(i) => F.pure(i.value)
case None =>
raiseOpt(
implementations.get(i.name),
s"The interface `${i.name}` is not implemented by any type.",
List(caret)
).flatMap { m =>
raiseOpt(
m.get(name).map {
case t: SchemaShape.InterfaceImpl.TypeImpl[G @unchecked, ?, ?] => t.t
case i: SchemaShape.InterfaceImpl.OtherInterface[G @unchecked, ?] => i.i
},
s"`$name` does not implement interface `${i.name}`, possible implementations are ${m.keySet.mkString(", ")}.",
List(caret)
)
}
}
case u: Union[G, ?] =>
// Can match to any type or any of it's types' interfacees
u.instanceMap.get(name) match {
case Some(i) => F.pure(i.tpe.value)
case None =>
raiseOpt(
u.types.toList.map(_.tpe.value).collectFirstSome(_.implementsMap.get(name)),
s"`$name` is not a member of the union `${u.name}` (or any of the union's types' implemented interfaces), possible members are ${u.instanceMap.keySet
.mkString(", ")}.",
List(caret)
).map(_.value)
}
}
}
}
override def collectSelectionInfo(sel: Selectable[G, ?], ss: QueryAst.SelectionSet[C]): F[List[SelectionInfo[G, C]]] = {
val all = ss.selections
val fields = all.collect { case QA.Selection.FieldSelection(field, c) => (c, field) }
val actualFields =
sel.abstractFieldMap + ("__typename" -> AbstractField(None, Eval.now(stringScalar), None))
val validateFieldsF = fields
.parTraverse { case (caret, field) =>
actualFields.get(field.name) match {
case None => raise[FieldInfo[G, C]](s"Field '${field.name}' is not a member of `${sel.name}`.", List(caret))
case Some(f) => ambientField(field.name)(collectFieldInfo(f, field, caret))
}
}
.map(_.toNel.toList.map(SelectionInfo(sel, _, None)))
val realInlines =
all
.collect { case QA.Selection.InlineFragmentSelection(f, c) => (c, f) }
.parFlatTraverse { case (caret, f) =>
DA.foldDirectives[Position.InlineFragmentSpread](f.directives, List(caret))(f) {
case (f, p: Position.InlineFragmentSpread[a], d) =>
DA.parseArg(p, d.arguments, List(caret)).map(p.handler(_, f)).flatMap(raiseEither(_, List(caret)))
}.map(_ tupleLeft caret)
}
.flatMap(_.parFlatTraverse { case (caret, f) =>
f.typeCondition.traverse(matchType(_, sel, caret)).map(_.getOrElse(sel)).flatMap { t =>
collectSelectionInfo(t, f.selectionSet).map(_.toList)
}
})
val realFragments = all
.collect { case QA.Selection.FragmentSpreadSelection(f, c) => (c, f) }
.parFlatTraverse { case (caret, f) =>
DA.foldDirectives[Position.FragmentSpread](f.directives, List(caret))(f) { case (f, p: Position.FragmentSpread[a], d) =>
DA.parseArg(p, d.arguments, List(caret)).map(p.handler(_, f)).flatMap(raiseEither(_, List(caret)))
}.map(_ tupleLeft caret)
}
.flatMap(_.parFlatTraverse { case (caret, f) =>
val fn = f.fragmentName
inFragment(fn, List(caret)) { f =>
matchType(f.typeCnd, sel, f.caret).flatMap { t =>
collectSelectionInfo(t, f.selectionSet)
.map(_.toList.map(_.copy(fragmentName = Some(fn))))
}
}
})
(validateFieldsF :: realInlines :: realFragments :: Nil).parFlatSequence
}
override def collectFieldInfo(qf: AbstractField[G, _], f: QueryAst.Field[C], caret: C): F[FieldInfo[G, C]] = {
val fields = f.arguments.toList.flatMap(_.nel.toList).map(x => x.name -> x.value).toMap
val verifyArgsF = qf.arg.traverse_ { case a: Arg[a] =>
A.decodeArg[a](a, fields.fmap(_.map(List(_))), ambigiousEnum = false, context = List(caret)).void
}
val c = f.caret
val x = f.selectionSet
val ims = InverseModifierStack.fromOut(qf.output.value)
val tl = ims.inner
val i: F[TypeInfo[G, C]] = tl match {
case s: Selectable[G, ?] =>
raiseOpt(
x,
s"Field `${f.name}` of type `${tl.name}` must have a selection set.",
List(c)
).flatMap(ss => collectSelectionInfo(s, ss)).map(TypeInfo.Selectable(tl.name, _))
case _: Enum[?] =>
if (x.isEmpty) F.pure(TypeInfo.Enum(tl.name))
else raise(s"Field `${f.name}` of enum type `${tl.name}` must not have a selection set.", List(c))
case _: Scalar[?] =>
if (x.isEmpty)
F.pure(TypeInfo.Scalar(tl.name))
else raise(s"Field `${f.name}` of scalar type `${tl.name}` must not have a selection set.", List(c))
}
verifyArgsF &> i.flatMap { fi =>
C.ask.map(c => FieldInfo[G, C](f.name, f.alias, f.arguments, ims.copy(inner = fi), f.directives, caret, c))
}
}
}
}
}
sealed trait TypeInfo[+G[_], +C] {
def name: String
}
object TypeInfo {
final case class Scalar(name: String) extends TypeInfo[Nothing, Nothing]
final case class Enum(name: String) extends TypeInfo[Nothing, Nothing]
final case class Selectable[G[_], C](name: String, selection: List[SelectionInfo[G, C]]) extends TypeInfo[G, C]
}
final case class SelectionInfo[G[_], C](
s: Selectable[G, ?],
fields: NonEmptyList[FieldInfo[G, C]],
fragmentName: Option[String]
)
final case class FieldInfo[G[_], C](
name: String,
alias: Option[String],
args: Option[QA.Arguments[C, AnyValue]],
tpe: InverseModifierStack[TypeInfo[G, C]],
directives: Option[QA.Directives[C, AnyValue]],
caret: C,
path: Cursor
) {
lazy val outputName: String = alias.getOrElse(name)
}