rpc: Add alt Ensure* functions acepting NodeContext

Author: dongcarl

src/rpc/blockchain.cpp

@@ -64,34 +64,46 @@ NodeContext& EnsureNodeContext(const std::any& context)
     return *node_context;
 }
 
-CTxMemPool& EnsureMemPool(const std::any& context)
+CTxMemPool& EnsureMemPool(const NodeContext& node)
 {
-    const NodeContext& node = EnsureNodeContext(context);
     if (!node.mempool) {
         throw JSONRPCError(RPC_CLIENT_MEMPOOL_DISABLED, "Mempool disabled or instance not found");
     }
     return *node.mempool;
 }
 
-ChainstateManager& EnsureChainman(const std::any& context)
+CTxMemPool& EnsureMemPool(const std::any& context)
+{
+    return EnsureMemPool(EnsureNodeContext(context));
+}
+
+ChainstateManager& EnsureChainman(const NodeContext& node)
 {
-    const NodeContext& node = EnsureNodeContext(context);
     if (!node.chainman) {
         throw JSONRPCError(RPC_INTERNAL_ERROR, "Node chainman not found");
     }
     WITH_LOCK(::cs_main, CHECK_NONFATAL(std::addressof(g_chainman) == std::addressof(*node.chainman)));
     return *node.chainman;
 }
 
-CBlockPolicyEstimator& EnsureFeeEstimator(const std::any& context)
+ChainstateManager& EnsureChainman(const std::any& context)
+{
+    return EnsureChainman(EnsureNodeContext(context));
+}
+
+CBlockPolicyEstimator& EnsureFeeEstimator(const NodeContext& node)
 {
-    NodeContext& node = EnsureNodeContext(context);
     if (!node.fee_estimator) {
         throw JSONRPCError(RPC_INTERNAL_ERROR, "Fee estimation disabled");
     }
     return *node.fee_estimator;
 }
 
+CBlockPolicyEstimator& EnsureFeeEstimator(const std::any& context)
+{
+    return EnsureFeeEstimator(EnsureNodeContext(context));
+}
+
 /* Calculate the difficulty for a given block index.
  */
 double GetDifficulty(const CBlockIndex* blockindex)

src/rpc/blockchain.h

@@ -57,8 +57,11 @@ void ScriptPubKeyToUniv(const CScript& scriptPubKey, UniValue& out, bool fInclud
 void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex = true, int serialize_flags = 0, const CTxUndo* txundo = nullptr);
 
 NodeContext& EnsureNodeContext(const std::any& context);
+CTxMemPool& EnsureMemPool(const NodeContext& node);
 CTxMemPool& EnsureMemPool(const std::any& context);
+ChainstateManager& EnsureChainman(const NodeContext& node);
 ChainstateManager& EnsureChainman(const std::any& context);
+CBlockPolicyEstimator& EnsureFeeEstimator(const NodeContext& node);
 CBlockPolicyEstimator& EnsureFeeEstimator(const std::any& context);
 
 /**