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package getter
import (
"context"
"io"
)
// readerFunc is syntactic sugar for read interface.
type readerFunc func(p []byte) (n int, err error)
func (rf readerFunc) Read(p []byte) (n int, err error) { return rf(p) }
// Copy is a io.Copy cancellable by context
func Copy(ctx context.Context, dst io.Writer, src io.Reader) (int64, error) {
// Copy will call the Reader and Writer interface multiple time, in order
// to copy by chunk (avoiding loading the whole file in memory).
return io.Copy(dst, readerFunc(func(p []byte) (int, error) {
select {
case <-ctx.Done():
// context has been canceled
// stop process and propagate "context canceled" error
return 0, ctx.Err()
default:
// otherwise just run default io.Reader implementation
return src.Read(p)
}
}))
}
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