a41f938cec
As we have seen, dependencies version can prevent the build. We should user lock versions on dependencies that we know work: * Packages are vendored * Add Godep support * Added addtional install step in readme * Fix travis build error
46 lignes
867 o
Go
46 lignes
867 o
Go
package resource
|
|
|
|
import (
|
|
"io"
|
|
"os"
|
|
)
|
|
|
|
// An Instance represents the content at some location accessed through some
|
|
// Provider. It's the data at some URL.
|
|
type Instance interface {
|
|
Get() (io.ReadCloser, error)
|
|
Put(io.Reader) error
|
|
Stat() (os.FileInfo, error)
|
|
ReadAt([]byte, int64) (int, error)
|
|
WriteAt([]byte, int64) (int, error)
|
|
Delete() error
|
|
}
|
|
|
|
// Creates a io.ReadSeeker to an Instance.
|
|
func ReadSeeker(r Instance) io.ReadSeeker {
|
|
fi, err := r.Stat()
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return io.NewSectionReader(r, 0, fi.Size())
|
|
}
|
|
|
|
// Move instance content, deleting the source if it succeeds.
|
|
func Move(from, to Instance) (err error) {
|
|
rc, err := from.Get()
|
|
if err != nil {
|
|
return
|
|
}
|
|
defer rc.Close()
|
|
err = to.Put(rc)
|
|
if err != nil {
|
|
return
|
|
}
|
|
from.Delete()
|
|
return
|
|
}
|
|
|
|
func Exists(i Instance) bool {
|
|
_, err := i.Stat()
|
|
return err == nil
|
|
}
|