Initial commit

cas/cas.go

@@ -0,0 +1,27 @@
+// Package cas provides a content-accessible storage implementation
+package cas
+
+import (
+	"io"
+	"time"
+)
+
+// Content is an item's content.
+type Content interface {
+	io.Reader
+	io.Seeker
+	io.Closer
+}
+
+// Meta is an item's metadata.
+type Meta interface {
+	Size() int64
+	ModTime() time.Time
+}
+
+// Store is a CAS store.
+type Store interface {
+	GetOrCreate(tag, item string, create func(io.Writer) error) (content Content, meta Meta, err error)
+	Tags() (tags []string, err error)
+	Remove(tag string) error
+}