Golang : Convert(cast) bytes.Buffer or bytes.NewBuffer type to io.Reader
Problem :
You need to convert or type cast bytes.Buffer
or bytes.NewBuffer
type to io.Reader
to use in io.MultiReader()
function because of this error :
cannot use buffer_slice (type []*bytes.Buffer) as type io.Reader in argument to io.MultiReader: []*bytes.Buffer does not implement io.Reader (missing Read method).
Solution :
Wrap the bytes.Buffer
with io.Reader array
. For example :
package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
)
func main() {
readerBuffer := bytes.NewBuffer([]byte("abcdefghijkl"))
readerBuffer2 := bytes.NewBuffer([]byte("mnopqrstuvwxyz"))
buff := []io.Reader{readerBuffer, readerBuffer2} // <------ here
combined := io.MultiReader(buff...)
data, _ := ioutil.ReadAll(combined)
fmt.Println(string(data))
}
or
package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
)
func main() {
//readerBuffer := bytes.NewBuffer([]byte("abcdefghijkl"))
readerBuffer := &bytes.Buffer{}
readerBuffer.Write([]byte("abcdefghijkl"))
//readerBuffer2 := bytes.NewBuffer([]byte("mnopqrstuvwxyz"))
readerBuffer2 := &bytes.Buffer{}
readerBuffer2.Write([]byte("mnopqrstuvwxyz"))
buff := []io.Reader{readerBuffer, readerBuffer2} // <------ here
combined := io.MultiReader(buff...)
data, _ := ioutil.ReadAll(combined)
fmt.Println(string(data))
}
Reference :
https://socketloop.com/references/golang-io-multireader-function-example
See also : Golang : Convert(cast) []byte to io.Reader type
By Adam Ng
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