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multiwrite_closer.go
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/
multiwrite_closer.go
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package main
import (
"fmt"
"io"
"strings"
)
type multiWriteCloser struct {
writers []io.WriteCloser
}
func (closer *multiWriteCloser) Write(data []byte) (int, error) {
errs := []string{}
for _, writer := range closer.writers {
_, err := writer.Write(data)
if err != nil && err != io.EOF {
errs = append(errs, err.Error())
}
}
if len(errs) > 0 {
return 0, fmt.Errorf(
"%d errors: %s",
len(errs),
strings.Join(errs, "; "),
)
}
return len(data), nil
}
func (closer *multiWriteCloser) Close() error {
errs := []string{}
for _, closer := range closer.writers {
err := closer.Close()
if err != nil && err != io.EOF {
errs = append(errs, err.Error())
}
}
if len(errs) > 0 {
return fmt.Errorf(
"%d errors: %s",
len(errs),
strings.Join(errs, "; "),
)
}
return nil
}