Golang : Convert to io.ReadSeeker type

Problem :

You want to open a file, read the content into a buffer and then convert the buffer to io.ReadSeeker type.

Solution :

Create a buffer and then convert the buffer with bytes.NewReader(buffer) function.

For example :

 file, err := os.Open(fileToUpload)
 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 defer file.Close()

 fileInfo, _ := file.Stat()
 var size int64 = fileInfo.Size()

 buffer := make([]byte, size)

 // read file content to buffer
 file.Read(buffer)

 fileBytes := bytes.NewReader(buffer) // converted to io.ReadSeeker type