Merge bitcoin/bitcoin#27069: net: add Ensure{any}Banman

2d955ff net: add `Ensure{any}Banman` (brunoerg)

Pull request description:

  This PR adds `Ensure{any}Banman` functions to avoid code repetition and make it cleaner. Same approach as done with argsman, chainman, connman and others.

ACKs for top commit:
  davidgumberg:
    ACK [2d955ff](bitcoin/bitcoin@2d955ff)

Tree-SHA512: 0beb7125312168a3df130c1793a1412ab423ef0f46023bfe2a121630c79df7e55d3d143fcf053bd09e2d96e9385a7a04594635da3e5c6be0c5d3a9cafbe3b631

Author: bitcoin-core-merge-script

src/rpc/net.cpp

@@ -702,9 +702,7 @@ static RPCHelpMan setban()
         throw std::runtime_error(help.ToString());
     }
     NodeContext& node = EnsureAnyNodeContext(request.context);
-    if (!node.banman) {
-        throw JSONRPCError(RPC_DATABASE_ERROR, "Error: Ban database not loaded");
-    }
+    BanMan& banman = EnsureBanman(node);
 
     CSubNet subNet;
     CNetAddr netAddr;
@@ -726,7 +724,7 @@ static RPCHelpMan setban()
 
     if (strCommand == "add")
     {
-        if (isSubnet ? node.banman->IsBanned(subNet) : node.banman->IsBanned(netAddr)) {
+        if (isSubnet ? banman.IsBanned(subNet) : banman.IsBanned(netAddr)) {
             throw JSONRPCError(RPC_CLIENT_NODE_ALREADY_ADDED, "Error: IP/Subnet already banned");
         }
 
@@ -741,20 +739,20 @@ static RPCHelpMan setban()
         }
 
         if (isSubnet) {
-            node.banman->Ban(subNet, banTime, absolute);
+            banman.Ban(subNet, banTime, absolute);
             if (node.connman) {
                 node.connman->DisconnectNode(subNet);
             }
         } else {
-            node.banman->Ban(netAddr, banTime, absolute);
+            banman.Ban(netAddr, banTime, absolute);
             if (node.connman) {
                 node.connman->DisconnectNode(netAddr);
             }
         }
     }
     else if(strCommand == "remove")
     {
-        if (!( isSubnet ? node.banman->Unban(subNet) : node.banman->Unban(netAddr) )) {
+        if (!( isSubnet ? banman.Unban(subNet) : banman.Unban(netAddr) )) {
             throw JSONRPCError(RPC_CLIENT_INVALID_IP_OR_SUBNET, "Error: Unban failed. Requested address/subnet was not previously manually banned.");
         }
     }
@@ -785,13 +783,10 @@ static RPCHelpMan listbanned()
                 },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {
-    NodeContext& node = EnsureAnyNodeContext(request.context);
-    if(!node.banman) {
-        throw JSONRPCError(RPC_DATABASE_ERROR, "Error: Ban database not loaded");
-    }
+    BanMan& banman = EnsureAnyBanman(request.context);
 
     banmap_t banMap;
-    node.banman->GetBanned(banMap);
+    banman.GetBanned(banMap);
     const int64_t current_time{GetTime()};
 
     UniValue bannedAddresses(UniValue::VARR);
@@ -825,12 +820,9 @@ static RPCHelpMan clearbanned()
                 },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {
-    NodeContext& node = EnsureAnyNodeContext(request.context);
-    if (!node.banman) {
-        throw JSONRPCError(RPC_DATABASE_ERROR, "Error: Ban database not loaded");
-    }
+    BanMan& banman = EnsureAnyBanman(request.context);
 
-    node.banman->ClearBanned();
+    banman.ClearBanned();
 
     return UniValue::VNULL;
 },

src/rpc/server_util.cpp

@@ -39,6 +39,20 @@ CTxMemPool& EnsureAnyMemPool(const std::any& context)
     return EnsureMemPool(EnsureAnyNodeContext(context));
 }
 
+
+BanMan& EnsureBanman(const NodeContext& node)
+{
+    if (!node.banman) {
+        throw JSONRPCError(RPC_DATABASE_ERROR, "Error: Ban database not loaded");
+    }
+    return *node.banman;
+}
+
+BanMan& EnsureAnyBanman(const std::any& context)
+{
+    return EnsureBanman(EnsureAnyNodeContext(context));
+}
+
 ArgsManager& EnsureArgsman(const NodeContext& node)
 {
     if (!node.args) {

src/rpc/server_util.h

@@ -13,13 +13,16 @@ class CConnman;
 class CTxMemPool;
 class ChainstateManager;
 class PeerManager;
+class BanMan;
 namespace node {
 struct NodeContext;
 } // namespace node
 
 node::NodeContext& EnsureAnyNodeContext(const std::any& context);
 CTxMemPool& EnsureMemPool(const node::NodeContext& node);
 CTxMemPool& EnsureAnyMemPool(const std::any& context);
+BanMan& EnsureBanman(const node::NodeContext& node);
+BanMan& EnsureAnyBanman(const std::any& context);
 ArgsManager& EnsureArgsman(const node::NodeContext& node);
 ArgsManager& EnsureAnyArgsman(const std::any& context);
 ChainstateManager& EnsureChainman(const node::NodeContext& node);