From aaa66443deb5cad60e8873105c1383d43428da79 Mon Sep 17 00:00:00 2001
From: zhiqiangxu <652732310@qq.com>
Date: Mon, 2 Aug 2021 10:52:48 +0800
Subject: [PATCH] add getcrossstateroot (#72)

---
 http/base/actor/ledger.go   |  4 ++++
 http/base/rpc/interfaces.go | 20 ++++++++++++++++++++
 http/jsonrpc/rpc_server.go  |  1 +
 3 files changed, 25 insertions(+)

diff --git a/http/base/actor/ledger.go b/http/base/actor/ledger.go
index 75792f8f9..9b795a029 100644
--- a/http/base/actor/ledger.go
+++ b/http/base/actor/ledger.go
@@ -105,3 +105,7 @@ func GetMerkleProof(proofHeight uint32, rootHeight uint32) ([]byte, error) {
 func GetCrossStatesProof(height uint32, key []byte) ([]byte, error) {
 	return ledger.DefLedger.GetCrossStatesProof(height, key)
 }
+
+func GetCrossStateRoot(height uint32) (common.Uint256, error) {
+	return ledger.DefLedger.GetCrossStateRoot(height)
+}
diff --git a/http/base/rpc/interfaces.go b/http/base/rpc/interfaces.go
index 129e02595..ab6793523 100644
--- a/http/base/rpc/interfaces.go
+++ b/http/base/rpc/interfaces.go
@@ -98,6 +98,26 @@ func GetLatestBlockMsgsSnap(params []interface{}) map[string]interface{} {
 	return responseSuccess(result)
 }
 
+// get cross state root
+func GetCrossStateRoot(params []interface{}) map[string]interface{} {
+	if len(params) < 1 {
+		return responsePack(berr.INVALID_PARAMS, nil)
+	}
+	switch (params[0]).(type) {
+	// block height
+	case float64:
+		height := uint32(params[0].(float64))
+		result, err := bactor.GetCrossStateRoot(height)
+		if err != nil {
+			return responsePack(berr.UNKNOWN_BLOCK, err.Error())
+		}
+		return responseSuccess(result)
+	default:
+		return responsePack(berr.INVALID_PARAMS, "")
+	}
+
+}
+
 //get block hash
 // A JSON example for getblockhash method as following:
 //   {"jsonrpc": "2.0", "method": "getblockhash", "params": [1], "id": 0}
diff --git a/http/jsonrpc/rpc_server.go b/http/jsonrpc/rpc_server.go
index c73d45e4a..d4dcd24c7 100644
--- a/http/jsonrpc/rpc_server.go
+++ b/http/jsonrpc/rpc_server.go
@@ -39,6 +39,7 @@ func StartRPCServer() error {
 	rpc.HandleFunc("getblockcount", rpc.GetBlockCount)
 	rpc.HandleFunc("getblockhash", rpc.GetBlockHash)
 	rpc.HandleFunc("getlatestblockmsgssnap", rpc.GetLatestBlockMsgsSnap)
+	rpc.HandleFunc("getcrossstateroot", rpc.GetCrossStateRoot)
 	rpc.HandleFunc("getconnectioncount", rpc.GetConnectionCount)
 	//HandleFunc("getrawmempool", GetRawMemPool)