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Compiler.scala
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Compiler.scala
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/*
* Copyright 2024 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
import cats._
import cats.implicits._
import io.circe._
import cats.effect._
import gql.server.interpreter.{StreamInterpreter, DebugPrinter}
import cats.data._
import scala.concurrent.duration._
import io.circe.syntax._
import gql.preparation._
import cats.parse.Caret
import cats.arrow.FunctionK
import cats.effect.std.Mutex
sealed trait CompilationError
object CompilationError {
final case class Parse(error: gql.parser.ParseError) extends CompilationError
object Parse {
implicit val encoder: Encoder.AsObject[Parse] = Encoder.AsObject.instance[Parse] { err =>
Map("errors" -> List(err.error)).asJsonObject
}
}
final case class Preparation(error: NonEmptyChain[PositionalError[Caret]]) extends CompilationError
object Preparation {
implicit val encoder: Encoder.AsObject[Preparation] = Encoder.AsObject.instance[Preparation] { err =>
Map("errors" -> err.error).asJsonObject
}
}
implicit val encoder: Encoder.AsObject[CompilationError] = Encoder.AsObject.instance[CompilationError] {
case err: Parse => err.asJsonObject
case err: Preparation => err.asJsonObject
}
}
sealed trait Application[F[_]] {
def mapK[G[_]](f: F ~> G): Application[G]
def modify(f: QueryResult => QueryResult)(implicit F: Functor[F]): Application[F]
}
object Application {
final case class Query[F[_]](run: F[QueryResult]) extends Application[F] {
override def mapK[G[_]](f: F ~> G): Query[G] = Query(f(run))
override def modify(f: QueryResult => QueryResult)(implicit F: Functor[F]): Query[F] =
Query(run.map(f))
}
final case class Mutation[F[_]](run: F[QueryResult]) extends Application[F] {
override def mapK[G[_]](f: F ~> G): Mutation[G] = Mutation(f(run))
override def modify(f: QueryResult => QueryResult)(implicit F: Functor[F]): Mutation[F] =
Mutation(run.map(f))
}
final case class Subscription[F[_]](run: fs2.Stream[F, QueryResult]) extends Application[F] {
override def mapK[G[_]](f: F ~> G): Subscription[G] = Subscription(run.translate(f))
override def modify(f: QueryResult => QueryResult)(implicit F: Functor[F]): Subscription[F] =
Subscription(run.map(f))
}
}
object Compiler {
type Outcome[F[_]] = Either[CompilationError, Application[F]]
final class PartiallyAppliedCompiler[F[_]](val F: Async[F]) extends AnyVal {
implicit def F0: Async[F] = F
def compile[Q, M, S](
schema: Schema[F, Q, M, S],
query: String,
variables: Map[String, Json] = Map.empty,
operationName: Option[String] = None,
queryInput: F[Q] = F.unit,
mutationInput: F[M] = F.unit,
subscriptionInput: F[S] = F.unit,
debug: DebugPrinter[F] = DebugPrinter.noop[F],
accumulate: Option[FiniteDuration] = Some(5.millis)
): Outcome[F] = compileWith(
schema,
QueryParameters(query, Some(variables), operationName),
queryInput,
mutationInput,
subscriptionInput,
debug,
accumulate
)
def compileWith[Q, M, S](
schema: Schema[F, Q, M, S],
cp: QueryParameters,
queryInput: F[Q] = F.unit,
mutationInput: F[M] = F.unit,
subscriptionInput: F[S] = F.unit,
debug: DebugPrinter[F] = DebugPrinter.noop[F],
accumulate: Option[FiniteDuration] = Some(5.millis)
): Outcome[F] =
parsePrep(schema, cp)
.map(compilePrepared(schema, _, queryInput, mutationInput, subscriptionInput, debug, accumulate))
def parsePrep[Q, M, S](
schema: Schema[F, Q, M, S],
cp: QueryParameters
): Either[CompilationError, PreparedRoot[F, Q, M, S]] =
gql.parser.parseQuery(cp.query) match {
case Left(pe) => Left(CompilationError.Parse(pe))
case Right(q) =>
RootPreparation.prepareRun(q, schema.shape, cp.variables.getOrElse(Map.empty), cp.operationName) match {
case Left(pe) => Left(CompilationError.Preparation(pe))
case Right(x) => Right(x)
}
}
def compilePrepared[Q, M, S](
schema: Schema[F, Q, M, S],
ps: PreparedRoot[F, Q, M, S],
queryInput: F[Q] = F.unit,
mutationInput: F[M] = F.unit,
subscriptionInput: F[S] = F.unit,
debug: DebugPrinter[F] = DebugPrinter.noop[F],
accumulate: Option[FiniteDuration] = Some(5.millis)
): Application[F] = {
implicit val s = schema.statistics
implicit val p = schema.planner
compileWithInterpreter(
ps,
StreamInterpreter[F](schema.state, debug, accumulate),
queryInput,
mutationInput,
subscriptionInput
)
}
def compileWithInterpreter[Q, M, S](
ps: PreparedRoot[F, Q, M, S],
interpreter: StreamInterpreter[F],
queryInput: F[Q] = F.unit,
mutationInput: F[M] = F.unit,
subscriptionInput: F[S] = F.unit
): Application[F] =
ps match {
case PreparedRoot.Query(ps) =>
Application.Query {
queryInput.flatMap(interpreter.interpretSync(_, ps, FunctionK.id[F]).map(_.asQueryResult))
}
case PreparedRoot.Mutation(ps) =>
Application.Mutation {
Mutex[F].flatMap { m =>
mutationInput.flatMap(interpreter.interpretSync(_, ps, m.lock.surroundK).map(_.asQueryResult))
}
}
case PreparedRoot.Subscription(ps) =>
Application.Subscription {
fs2.Stream
.eval(subscriptionInput)
.flatMap(interpreter.interpretStream(_, ps, throttle = FunctionK.id[F]).map(_.asQueryResult))
}
}
}
def apply[F[_]](implicit F: Async[F]): PartiallyAppliedCompiler[F] = new PartiallyAppliedCompiler[F](F)
}