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Paginated.scala
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Paginated.scala
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/*
* Copyright 2021 Arman Bilge
*
* 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 gcp4s
import cats.MonadThrow
import cats.syntax.all.*
import fs2.Stream
import org.http4s.EntityDecoder
import org.http4s.Method
import org.http4s.Request
import org.http4s.client.Client
trait Paginated[A]:
extension (paginated: A) def pageToken: Option[String]
extension [F[_]](client: Client[F])
def pageThrough[A: Paginated](
req: Request[F])(using MonadThrow[F], EntityDecoder[F, A]): Stream[F, A] =
req.method match
case Method.GET =>
Stream.unfoldLoopEval(req.uri) { uri =>
client.expect[A](req.withUri(uri)).map { a =>
(a, a.pageToken.map(uri.withQueryParam("pageToken", _)))
}
}
case _ =>
Stream.raiseError(
new IllegalArgumentException("Paginated request must be a GET request"))