Merge #19277: util: Add Assert identity function

fab80fef61ddd4afeff6e497c7e76bffcd05e8a4 refactor: Remove unused EnsureChainman (MarcoFalke)
fa34587f1c811d99200453b0936219c473f514b0 scripted-diff: Replace EnsureChainman with Assert in unit tests (MarcoFalke)
fa6ef701adba1cb48535cac25fd43c742a82e40d util: Add Assert identity function (MarcoFalke)
fa457fbd3387661e1973a8f4e5cc2def79e0c625 move-only: Move NDEBUG compile time check to util/check (MarcoFalke)

Pull request description:

  The utility function is primarily useful to dereference pointer types, which are known to be not null at that time.

  For example, the ArgsManager is known to exist when the wallets are started: https://github.com/bitcoin/bitcoin/pull/18923/files#diff-fdb2a1a1d8bc790fcddeb6cf5a42ac55R503 . Instead of silently relying on that assumption, `Assert` can be used to abort the program and avoid UB should the assumption ever be violated.

ACKs for top commit:
  promag:
    Tested ACK fab80fef61ddd4afeff6e497c7e76bffcd05e8a4.
  ryanofsky:
    Code review ACK fab80fef61ddd4afeff6e497c7e76bffcd05e8a4

Tree-SHA512: 830fba10152ba17d47c4dd42809c7e26f9fe6d38e17a2d5b3f054fd644a5c4c9841286ac421ec9bb28cea9f5faeb659740fcf00de6cc589d423fee7694c42d16

1 files changed, 4 insertions, 1 deletions

diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 6250ca918a..630a8b463f 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -75,7 +75,10 @@ CTxMemPool& EnsureMemPool(const util::Ref& context)
 ChainstateManager& EnsureChainman(const util::Ref& context)
 {
     NodeContext& node = EnsureNodeContext(context);
-    return EnsureChainman(node);
+    if (!node.chainman) {
+        throw JSONRPCError(RPC_INTERNAL_ERROR, "Node chainman not found");
+    }
+    return *node.chainman;
 }
 
 /* Calculate the difficulty for a given block index.