RPC: Extract InvalidateBlock helper

Author: fjahr

src/rpc/blockchain.cpp

@@ -1577,28 +1577,12 @@ static RPCHelpMan preciousblock()
     };
 }
 
-static RPCHelpMan invalidateblock()
-{
-    return RPCHelpMan{"invalidateblock",
-                "\nPermanently marks a block as invalid, as if it violated a consensus rule.\n",
-                {
-                    {"blockhash", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "the hash of the block to mark as invalid"},
-                },
-                RPCResult{RPCResult::Type::NONE, "", ""},
-                RPCExamples{
-                    HelpExampleCli("invalidateblock", "\"blockhash\"")
-            + HelpExampleRpc("invalidateblock", "\"blockhash\"")
-                },
-        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
-{
-    uint256 hash(ParseHashV(request.params[0], "blockhash"));
+void InvalidateBlock(ChainstateManager& chainman, const uint256 block_hash) {
     BlockValidationState state;
-
-    ChainstateManager& chainman = EnsureAnyChainman(request.context);
     CBlockIndex* pblockindex;
     {
-        LOCK(cs_main);
-        pblockindex = chainman.m_blockman.LookupBlockIndex(hash);
+        LOCK(chainman.GetMutex());
+        pblockindex = chainman.m_blockman.LookupBlockIndex(block_hash);
         if (!pblockindex) {
             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
         }
@@ -1612,6 +1596,26 @@ static RPCHelpMan invalidateblock()
     if (!state.IsValid()) {
         throw JSONRPCError(RPC_DATABASE_ERROR, state.ToString());
     }
+}
+
+static RPCHelpMan invalidateblock()
+{
+    return RPCHelpMan{"invalidateblock",
+                "\nPermanently marks a block as invalid, as if it violated a consensus rule.\n",
+                {
+                    {"blockhash", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "the hash of the block to mark as invalid"},
+                },
+                RPCResult{RPCResult::Type::NONE, "", ""},
+                RPCExamples{
+                    HelpExampleCli("invalidateblock", "\"blockhash\"")
+            + HelpExampleRpc("invalidateblock", "\"blockhash\"")
+                },
+        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
+{
+    ChainstateManager& chainman = EnsureAnyChainman(request.context);
+    uint256 hash(ParseHashV(request.params[0], "blockhash"));
+
+    InvalidateBlock(chainman, hash);
 
     return UniValue::VNULL;
 },