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55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// Copyright (c) 2023 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package file
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import (
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"bytes"
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"context"
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"io"
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E "github.com/IBM/fp-go/either"
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)
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type (
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readerWithContext struct {
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ctx context.Context
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delegate io.Reader
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}
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)
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func (rdr *readerWithContext) Read(p []byte) (int, error) {
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// check for cancellarion
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if err := rdr.ctx.Err(); err != nil {
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return 0, err
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}
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// simply dispatch
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return rdr.delegate.Read(p)
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}
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// MakeReader creates a context aware reader
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func MakeReader(ctx context.Context, rdr io.Reader) io.Reader {
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return &readerWithContext{ctx, rdr}
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}
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// ReadAll reads the content of a reader and allows it to be canceled
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func ReadAll(ctx context.Context, rdr io.Reader) E.Either[error, []byte] {
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return E.TryCatchError(func() ([]byte, error) {
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var buffer bytes.Buffer
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_, err := io.Copy(&buffer, MakeReader(ctx, rdr))
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return buffer.Bytes(), err
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})
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}
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