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io.go
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io.go
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package ioextensions
import (
"fmt"
"io"
"os"
"github.com/apecloud/dataprotection-wal-g/utility"
)
type ReadSeekCloser interface {
io.Reader
io.Seeker
io.Closer
}
type ReadSeekCloserImpl struct {
io.Reader
io.Seeker
io.Closer
}
// ReadCascadeCloser composes io.ReadCloser from two parts
type ReadCascadeCloser struct {
io.Reader
io.Closer
}
type Flusher interface {
Flush() error
}
type OnCloseFlusher struct {
io.WriteCloser
Flusher
}
func NewOnCloseFlusher(writeCloser io.WriteCloser, flusher Flusher) *OnCloseFlusher {
return &OnCloseFlusher{writeCloser, flusher}
}
func (cf OnCloseFlusher) Close() error {
err := cf.WriteCloser.Close()
if err != nil {
return err
}
return cf.Flush()
}
// ZeroReader generates a slice of zeroes. Used to pad
// tar in cases where length of file changes.
type ZeroReader struct{}
func (z *ZeroReader) Read(p []byte) (int, error) {
zeroes := make([]byte, len(p))
n := copy(p, zeroes)
return n, nil
}
func CreateFileWith(filePath string, content io.Reader) error {
file, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_EXCL, 0666)
if err != nil {
return err
}
_, err = utility.FastCopy(file, content)
return err
}
type MultiCloser struct {
closers []io.Closer
}
func NewMultiCloser(closers []io.Closer) *MultiCloser {
return &MultiCloser{
closers: closers,
}
}
func (m *MultiCloser) Close() error {
var err error
for _, c := range m.closers {
// still call Close on each, even if one returns an error
if e := c.Close(); e != nil {
if err != nil {
err = fmt.Errorf("%w; %v", err, e)
} else {
err = e
}
}
}
return err
}