Merge pull request #626 from filecoin-project/feat/chain-sync-manager

Implement chain sync manager

api/api_full.go

@@ -253,7 +253,7 @@ type ReplayResults struct {
 	Error   string
 }
 
-type SyncState struct {
+type ActiveSync struct {
 	Base   *types.TipSet
 	Target *types.TipSet
 
@@ -261,6 +261,10 @@ type SyncState struct {
 	Height uint64
 }
 
+type SyncState struct {
+	ActiveSyncs []ActiveSync
+}
+
 type SyncStateStage int
 
 const (