mirror of
https://github.com/thegeeklab/drone-s3-sync.git
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89 lines
2.4 KiB
Go
89 lines
2.4 KiB
Go
package aws
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import (
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"io"
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"sync"
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)
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// ReadSeekCloser wraps a io.Reader returning a ReaderSeekerCloser
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func ReadSeekCloser(r io.Reader) ReaderSeekerCloser {
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return ReaderSeekerCloser{r}
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}
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// ReaderSeekerCloser represents a reader that can also delegate io.Seeker and
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// io.Closer interfaces to the underlying object if they are available.
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type ReaderSeekerCloser struct {
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r io.Reader
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}
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// Read reads from the reader up to size of p. The number of bytes read, and
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// error if it occurred will be returned.
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//
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// If the reader is not an io.Reader zero bytes read, and nil error will be returned.
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//
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// Performs the same functionality as io.Reader Read
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func (r ReaderSeekerCloser) Read(p []byte) (int, error) {
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switch t := r.r.(type) {
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case io.Reader:
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return t.Read(p)
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}
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return 0, nil
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}
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// Seek sets the offset for the next Read to offset, interpreted according to
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// whence: 0 means relative to the origin of the file, 1 means relative to the
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// current offset, and 2 means relative to the end. Seek returns the new offset
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// and an error, if any.
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//
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// If the ReaderSeekerCloser is not an io.Seeker nothing will be done.
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func (r ReaderSeekerCloser) Seek(offset int64, whence int) (int64, error) {
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switch t := r.r.(type) {
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case io.Seeker:
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return t.Seek(offset, whence)
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}
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return int64(0), nil
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}
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// Close closes the ReaderSeekerCloser.
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//
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// If the ReaderSeekerCloser is not an io.Closer nothing will be done.
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func (r ReaderSeekerCloser) Close() error {
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switch t := r.r.(type) {
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case io.Closer:
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return t.Close()
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}
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return nil
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}
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// A WriteAtBuffer provides a in memory buffer supporting the io.WriterAt interface
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// Can be used with the s3manager.Downloader to download content to a buffer
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// in memory. Safe to use concurrently.
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type WriteAtBuffer struct {
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buf []byte
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m sync.Mutex
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}
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// WriteAt writes a slice of bytes to a buffer starting at the position provided
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// The number of bytes written will be returned, or error. Can overwrite previous
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// written slices if the write ats overlap.
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func (b *WriteAtBuffer) WriteAt(p []byte, pos int64) (n int, err error) {
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b.m.Lock()
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defer b.m.Unlock()
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expLen := pos + int64(len(p))
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if int64(len(b.buf)) < expLen {
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newBuf := make([]byte, expLen)
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copy(newBuf, b.buf)
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b.buf = newBuf
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}
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copy(b.buf[pos:], p)
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return len(p), nil
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}
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// Bytes returns a slice of bytes written to the buffer.
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func (b *WriteAtBuffer) Bytes() []byte {
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b.m.Lock()
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defer b.m.Unlock()
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return b.buf[:len(b.buf):len(b.buf)]
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}
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