fp-go/v2/context/readerresult/cancel.go

// Copyright (c) 2023 - 2025 IBM Corp.
// All rights reserved.
//
// 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 readerresult

import (
	"context"

	E "github.com/IBM/fp-go/v2/either"
	F "github.com/IBM/fp-go/v2/function"
)

// withContext wraps an existing ReaderResult and performs a context check for cancellation before deletating
func WithContext[A any](ma ReaderResult[A]) ReaderResult[A] {
	return func(ctx context.Context) E.Either[error, A] {
		if ctx.Err() != nil {
			return E.Left[A](context.Cause(ctx))
		}
		return ma(ctx)
	}
}

//go:inline
func WithContextK[A, B any](f Kleisli[A, B]) Kleisli[A, B] {
	return F.Flow2(
		f,
		WithContext,
	)
}