github.com/qiniu/go-sdk/v7@v7.27.0/storage/upload_source.go (about)

     1  package storage
     2  
     3  import (
     4  	"errors"
     5  	"io"
     6  	"os"
     7  )
     8  
     9  type UploadSource interface {
    10  	Size() int64
    11  	Rewindable() bool
    12  	Rewind() error
    13  }
    14  
    15  func NewUploadSourceReader(reader io.Reader, size int64) (UploadSource, error) {
    16  	return &uploadSourceReader{
    17  		reader: reader,
    18  		size:   size,
    19  	}, nil
    20  }
    21  
    22  type uploadSourceReader struct {
    23  	reader io.Reader
    24  	size   int64
    25  }
    26  
    27  func (u *uploadSourceReader) Rewindable() bool {
    28  	return false
    29  }
    30  
    31  func (u *uploadSourceReader) Rewind() error {
    32  	return errors.New("resource not support rewind")
    33  }
    34  
    35  func (u *uploadSourceReader) Size() int64 {
    36  	return u.size
    37  }
    38  
    39  func NewUploadSourceReaderAt(reader io.ReaderAt, size int64) (UploadSource, error) {
    40  	if size <= 0 {
    41  		return nil, errors.New("source size must be set")
    42  	}
    43  
    44  	return &uploadSourceReaderAt{
    45  		reader: reader,
    46  		size:   size,
    47  	}, nil
    48  }
    49  
    50  type uploadSourceReaderAt struct {
    51  	reader io.ReaderAt
    52  	size   int64
    53  }
    54  
    55  func (u *uploadSourceReaderAt) Rewindable() bool {
    56  	return true
    57  }
    58  
    59  func (u *uploadSourceReaderAt) Rewind() error {
    60  	return nil
    61  }
    62  
    63  func (u *uploadSourceReaderAt) Size() int64 {
    64  	return u.size
    65  }
    66  
    67  func NewUploadSourceFile(filePath string) (UploadSource, error) {
    68  	if fileInfo, err := os.Stat(filePath); err != nil {
    69  		return nil, err
    70  	} else {
    71  		return &uploadSourceFile{
    72  			fileInfo: fileInfo,
    73  			filePath: filePath,
    74  		}, nil
    75  	}
    76  }
    77  
    78  type uploadSourceFile struct {
    79  	filePath string
    80  	fileInfo os.FileInfo
    81  }
    82  
    83  func (u *uploadSourceFile) Rewindable() bool {
    84  	return true
    85  }
    86  
    87  func (u *uploadSourceFile) Rewind() error {
    88  	return nil
    89  }
    90  
    91  func (u *uploadSourceFile) Size() int64 {
    92  	return u.fileInfo.Size()
    93  }