mirror of
https://github.com/IBM/fp-go.git
synced 2025-06-23 00:27:49 +02:00
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
// Copyright (c) 2023 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 file
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
"os"
|
|
|
|
RIOE "github.com/IBM/fp-go/context/readerioeither"
|
|
ET "github.com/IBM/fp-go/either"
|
|
F "github.com/IBM/fp-go/function"
|
|
"github.com/IBM/fp-go/internal/file"
|
|
IOE "github.com/IBM/fp-go/ioeither"
|
|
)
|
|
|
|
var (
|
|
openIOE = IOE.Eitherize1(os.Open)
|
|
// Open opens a file for reading within the given context
|
|
Open = F.Flow3(
|
|
openIOE,
|
|
RIOE.FromIOEither[*os.File],
|
|
RIOE.WithContext[*os.File],
|
|
)
|
|
)
|
|
|
|
// Close closes an object
|
|
func Close[C io.Closer](c C) RIOE.ReaderIOEither[any] {
|
|
return RIOE.FromIOEither(func() ET.Either[error, any] {
|
|
return ET.TryCatchError(func() (any, error) {
|
|
return c, c.Close()
|
|
})
|
|
})
|
|
}
|
|
|
|
// ReadFile reads a file in the scope of a context
|
|
func ReadFile(path string) RIOE.ReaderIOEither[[]byte] {
|
|
return RIOE.WithResource[[]byte](Open(path), Close[*os.File])(func(r *os.File) RIOE.ReaderIOEither[[]byte] {
|
|
return func(ctx context.Context) IOE.IOEither[error, []byte] {
|
|
return IOE.MakeIO(func() ET.Either[error, []byte] {
|
|
return file.ReadAll(ctx, r)
|
|
})
|
|
}
|
|
})
|
|
}
|