rclone/lib/readers/context.go

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package readers
import (
"context"
"io"
)
// NewContextReader creates a reader, that returns any errors that ctx gives
func NewContextReader(ctx context.Context, r io.Reader) io.Reader {
return &contextReader{
ctx: ctx,
r: r,
}
}
type contextReader struct {
ctx context.Context
r io.Reader
}
// Read bytes as per io.Reader interface
func (cr *contextReader) Read(p []byte) (n int, err error) {
err = cr.ctx.Err()
if err != nil {
return 0, err
}
return cr.r.Read(p)
}