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io.go
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io.go
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//
// Copyright (C) 2019-2024 vdaas.org vald team <[email protected]>
//
// 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
//
// https://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 io provides io functions
package io
import (
"bytes"
"context"
"io"
"github.com/vdaas/vald/internal/conv"
"github.com/vdaas/vald/internal/errors"
"github.com/vdaas/vald/internal/safety"
"github.com/vdaas/vald/internal/sync"
)
type (
Reader = io.Reader
Writer = io.Writer
Closer = io.Closer
ReadCloser = io.ReadCloser
WriteCloser = io.WriteCloser
)
var (
Pipe = io.Pipe
EOF = io.EOF
NopCloser = io.NopCloser
Discard = io.Discard
ErrUnexpectedEOF = io.ErrUnexpectedEOF
ErrClosedPipe = io.ErrClosedPipe
ErrNoProgress = io.ErrNoProgress
ErrShortWrite = io.ErrShortWrite
ErrShortBuffer = io.ErrShortBuffer
bufferPool = sync.Pool{
New: func() any {
return bytes.NewBuffer(make([]byte, 0, bytes.MinRead*2))
},
}
)
type ctxReader struct {
ctx context.Context
r io.Reader
}
func NewReaderWithContext(ctx context.Context, r io.Reader) (io.Reader, error) {
if ctx == nil {
return nil, errors.NewErrContextNotProvided
}
if r == nil {
return nil, errors.NewErrReaderNotProvided
}
return &ctxReader{
ctx: ctx,
r: r,
}, nil
}
func NewReadCloserWithContext(ctx context.Context, r io.ReadCloser) (io.ReadCloser, error) {
if ctx == nil {
return nil, errors.NewErrContextNotProvided
}
if r == nil {
return nil, errors.NewErrReaderNotProvided
}
return &ctxReader{
ctx: ctx,
r: r,
}, nil
}
func (r *ctxReader) Read(p []byte) (n int, err error) {
select {
case <-r.ctx.Done():
return 0, r.ctx.Err()
default:
}
return r.r.Read(p)
}
func (r *ctxReader) Close() error {
select {
case <-r.ctx.Done():
return r.ctx.Err()
default:
}
if c, ok := r.r.(io.Closer); ok {
return c.Close()
}
return nil
}
type ctxWriter struct {
ctx context.Context
w io.Writer
}
func NewWriterWithContext(ctx context.Context, w io.Writer) (io.Writer, error) {
if ctx == nil {
return nil, errors.NewErrContextNotProvided
}
if w == nil {
return nil, errors.NewErrWriterNotProvided
}
return &ctxWriter{
ctx: ctx,
w: w,
}, nil
}
func NewWriteCloserWithContext(ctx context.Context, w io.WriteCloser) (io.WriteCloser, error) {
if ctx == nil {
return nil, errors.NewErrContextNotProvided
}
if w == nil {
return nil, errors.NewErrWriterNotProvided
}
return &ctxWriter{
ctx: ctx,
w: w,
}, nil
}
func (w *ctxWriter) Write(p []byte) (n int, err error) {
select {
case <-w.ctx.Done():
return 0, w.ctx.Err()
default:
}
return w.w.Write(p)
}
func (w *ctxWriter) Close() error {
select {
case <-w.ctx.Done():
return w.ctx.Err()
default:
}
if c, ok := w.w.(Closer); ok {
return c.Close()
}
return nil
}
type eofReader struct{}
func NewEOFReader() Reader {
return &eofReader{}
}
func (*eofReader) Read([]byte) (n int, err error) {
return 0, EOF
}
func ReadAll(r Reader) (b []byte, err error) {
buf := bufferPool.Get().(*bytes.Buffer)
defer bufferPool.Put(buf)
defer buf.Reset()
err = safety.RecoverFunc(func() (err error) {
_, err = buf.ReadFrom(r)
return err
})()
if err != nil {
return nil, err
}
return conv.Atob(buf.String()), nil
}