Port dag commansds to CoreAPI

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>

coreapi.go

@@ -19,7 +19,7 @@ type CoreAPI interface {
 	Block() BlockAPI
 
 	// Dag returns an implementation of Dag API
-	Dag() ipld.DAGService
+	Dag() APIDagService
 
 	// Name returns an implementation of Name API
 	Name() NameAPI

dag.go

+package iface
+
+import (
+	ipld "gx/ipfs/QmcKKBwfz6FyQdHR2jsXrrF6XeSBXYL86anmWNewpFpoF5/go-ipld-format"
+)
+
+// APIDagService extends ipld.DAGService
+type APIDagService interface {
+	ipld.DAGService
+
+	// Pinning returns special NodeAdder which recursively pins added nodes
+	Pinning() ipld.NodeAdder
+}