Merge bitcoin/bitcoin#23936: rpc: Add and use EnsureArgsman helper

fa5bb37611dea5d3e6715b0c84249e39ad1d2476 rpc: Use EnsureAnyArgsman in rpc/blockchain (MarcoFalke)
fa98b6f6449d33b315a73156c6de968f1757d53a rpc: Add EnsureArgsman helper (MarcoFalke)

Pull request description:

  This refactor doesn't change anything for the rpc layer, but it helps a bit with removing gArgs (See #21005)

ACKs for top commit:
  shaavan:
    Code Review ACK fa5bb37611dea5d3e6715b0c84249e39ad1d2476

Tree-SHA512: 18f9cc90830a168acb94452b541b6e97ba9a50a0f4834698a16994c3884c833dc606e36a5538a16352e5e5cc43d3ac77cb498f877f8f5bc5dd52fa84f8bf2056

4 files changed, 25 insertions, 9 deletions

diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 269ef4fe48..20a5eea173 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -1544,6 +1544,7 @@ RPCHelpMan getblockchaininfo()
                 },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {
+    const ArgsManager& args{EnsureAnyArgsman(request.context)};
     ChainstateManager& chainman = EnsureAnyChainman(request.context);
     LOCK(cs_main);
     CChainState& active_chainstate = chainman.ActiveChainstate();
@@ -1574,7 +1575,7 @@ RPCHelpMan getblockchaininfo()
         obj.pushKV("pruneheight",        block->nHeight);
 
         // if 0, execution bypasses the whole if block.
-        bool automatic_pruning = (gArgs.GetIntArg("-prune", 0) != 1);
+        bool automatic_pruning{args.GetIntArg("-prune", 0) != 1};
         obj.pushKV("automatic_pruning",  automatic_pruning);
         if (automatic_pruning) {
             obj.pushKV("prune_target_size",  nPruneTarget);
@@ -2270,10 +2271,9 @@ static RPCHelpMan savemempool()
                 },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {
+    const ArgsManager& args{EnsureAnyArgsman(request.context)};
     const CTxMemPool& mempool = EnsureAnyMemPool(request.context);
 
-    const NodeContext& node = EnsureAnyNodeContext(request.context);
-
     if (!mempool.IsLoaded()) {
         throw JSONRPCError(RPC_MISC_ERROR, "The mempool was not loaded yet");
     }
@@ -2283,7 +2283,7 @@ static RPCHelpMan savemempool()
     }
 
     UniValue ret(UniValue::VOBJ);
-    ret.pushKV("filename", fs::path((node.args->GetDataDirNet() / "mempool.dat")).u8string());
+    ret.pushKV("filename", fs::path((args.GetDataDirNet() / "mempool.dat")).u8string());
 
     return ret;
 },
@@ -2628,10 +2628,11 @@ static RPCHelpMan dumptxoutset()
         },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {
-    const fs::path path = fsbridge::AbsPathJoin(gArgs.GetDataDirNet(), fs::u8path(request.params[0].get_str()));
+    const ArgsManager& args{EnsureAnyArgsman(request.context)};
+    const fs::path path = fsbridge::AbsPathJoin(args.GetDataDirNet(), fs::u8path(request.params[0].get_str()));
     // Write to a temporary path and then move into `path` on completion
     // to avoid confusion due to an interruption.
-    const fs::path temppath = fsbridge::AbsPathJoin(gArgs.GetDataDirNet(), fs::u8path(request.params[0].get_str() + ".incomplete"));
+    const fs::path temppath = fsbridge::AbsPathJoin(args.GetDataDirNet(), fs::u8path(request.params[0].get_str() + ".incomplete"));
 
     if (fs::exists(path)) {
         throw JSONRPCError(
diff --git a/src/rpc/blockchain.h b/src/rpc/blockchain.h
index e487accb66..2176b5997e 100644
--- a/src/rpc/blockchain.h
+++ b/src/rpc/blockchain.h
@@ -21,7 +21,6 @@ class CBlock;
 class CBlockIndex;
 class CChainState;
 class CTxMemPool;
-class ChainstateManager;
 class UniValue;
 struct NodeContext;
 
diff --git a/src/rpc/server_util.cpp b/src/rpc/server_util.cpp
index 3fc35222e1..2978051574 100644
--- a/src/rpc/server_util.cpp
+++ b/src/rpc/server_util.cpp
@@ -37,6 +37,19 @@ CTxMemPool& EnsureAnyMemPool(const std::any& context)
     return EnsureMemPool(EnsureAnyNodeContext(context));
 }
 
+ArgsManager& EnsureArgsman(const NodeContext& node)
+{
+    if (!node.args) {
+        throw JSONRPCError(RPC_INTERNAL_ERROR, "Node args not found");
+    }
+    return *node.args;
+}
+
+ArgsManager& EnsureAnyArgsman(const std::any& context)
+{
+    return EnsureArgsman(EnsureAnyNodeContext(context));
+}
+
 ChainstateManager& EnsureChainman(const NodeContext& node)
 {
     if (!node.chainman) {
diff --git a/src/rpc/server_util.h b/src/rpc/server_util.h
index ad3c149c90..3b0df2d651 100644
--- a/src/rpc/server_util.h
+++ b/src/rpc/server_util.h
@@ -7,16 +7,19 @@
 
 #include <any>
 
+class ArgsManager;
 class CBlockPolicyEstimator;
 class CConnman;
-class ChainstateManager;
 class CTxMemPool;
-struct NodeContext;
+class ChainstateManager;
 class PeerManager;
+struct NodeContext;
 
 NodeContext& EnsureAnyNodeContext(const std::any& context);
 CTxMemPool& EnsureMemPool(const NodeContext& node);
 CTxMemPool& EnsureAnyMemPool(const std::any& context);
+ArgsManager& EnsureArgsman(const NodeContext& node);
+ArgsManager& EnsureAnyArgsman(const std::any& context);
 ChainstateManager& EnsureChainman(const NodeContext& node);
 ChainstateManager& EnsureAnyChainman(const std::any& context);
 CBlockPolicyEstimator& EnsureFeeEstimator(const NodeContext& node);