pin: Return copies of pinned keys, of each type (direct/indirect/recursive)

pin/indirect.go

@@ -65,3 +65,7 @@ func (i *indirectPin) Decrement(k util.Key) {
 func (i *indirectPin) HasKey(k util.Key) bool {
 	return i.blockset.HasKey(k)
 }
+
+func (i *indirectPin) Set() set.BlockSet {
+	return i.blockset
+}

pin/pin.go

@@ -33,7 +33,9 @@ type Pinner interface {
 	Unpin(util.Key, bool) error
 	Flush() error
 	GetManual() ManualPinner
-	Set() set.BlockSet
+	DirectKeys() []util.Key
+	IndirectKeys() []util.Key
+	RecursiveKeys() []util.Key
 }
 
 // ManualPinner is for manually editing the pin structure
@@ -208,9 +210,19 @@ func LoadPinner(d ds.Datastore, dserv mdag.DAGService) (Pinner, error) {
 	return p, nil
 }
 
-// Set returns a blockset of directly pinned keys
-func (p *pinner) Set() set.BlockSet {
-	return p.directPin
+// DirectKeys returns a slice containing the directly pinned keys
+func (p *pinner) DirectKeys() []util.Key {
+	return p.directPin.GetKeys()
+}
+
+// IndirectKeys returns a slice containing the indirectly pinned keys
+func (p *pinner) IndirectKeys() []util.Key {
+	return p.indirPin.Set().GetKeys()
+}
+
+// RecursiveKeys returns a slice containing the recursively pinned keys
+func (p *pinner) RecursiveKeys() []util.Key {
+	return p.recursePin.GetKeys()
 }
 
 // Flush encodes and writes pinner keysets to the datastore