cache

type Cache interface {

	// Put stores a stream of `size` bytes from `rdr` into the cache. If `hash` is
	// not the empty string, and the contents don't match it, a non-nil error is
	// returned.
	Put(kind EntryKind, hash string, size int64, rdr io.Reader) error

	// Get returns an io.ReadCloser with the content of the cache item stored under `hash`
	// and the number of bytes that can be read from it. If the item is not found, `rdr` is
	// nil. If some error occurred when processing the request, then it is returned.
	Get(kind EntryKind, hash string) (rdr io.ReadCloser, sizeBytes int64, err error)

	// Contains returns true if the `hash` key exists in the cache.
	Contains(kind EntryKind, hash string) (ok bool)

	// MaxSize returns the maximum cache size in bytes.
	MaxSize() int64

	// Return the current size of the cache in bytes, and the number of
	// items stored in the cache.
	Stats() (int64, int)
}

type EntryKind int

type Error struct {
	// Corresponds to a http.Status* code
	Code int
	// A human-readable string describing the error
	Text string
}

type Logger interface {
	Printf(format string, v ...interface{})
}