add GetTwoWayPegData RPC

Author: Ash-L2L

proto/mainchain.proto

@@ -41,6 +41,8 @@ service Mainchain {
   rpc GetBmmHStarCommitments(GetBmmHStarCommitmentsRequest)
     returns (GetBmmHStarCommitmentsResponse);
   rpc GetChainTip(GetChainTipRequest) returns (GetChainTipResponse);
+  rpc GetTwoWayPegData(GetTwoWayPegDataRequest)
+    returns (GetTwoWayPegDataResponse);
   rpc SubscribeEvents(SubscribeEventsRequest) returns (stream EventResponse);
 }
 
@@ -73,6 +75,19 @@ message GetChainTipResponse {
   BlockHeaderInfo block_header_info = 1;
 }
 
+message GetTwoWayPegDataRequest {
+  uint32 sidechain_id = 1;
+  bytes start_block_hash = 2;
+  bytes end_block_hash = 3;
+}
+message GetTwoWayPegDataResponse {
+  message ResponseItem {
+    BlockHeaderInfo block_header_info = 1;
+    BlockInfo block_info = 2;
+  }
+  repeated ResponseItem blocks = 1;
+}
+
 message SubscribeEventsRequest {
 }
 message EventResponse {