Merge #18531: rpc: remove deprecated CRPCCommand constructor

faaf9c58e4aa809019d4ca12747dd47411988e37 remove CRPCCommand constructor that takes rpcfn_type function pointer (MarcoFalke)
fa19bb2cd8c575593583138a84e6bb3444d6196d remove dead rpc code (MarcoFalke)

Pull request description:

  Remove the CRPCCommand arguments, now that they are asserted to be equal and thus redundant

  ### Future work

  > Here or follow up, makes sense to also assert type of returned UniValue?

  Sure, but let's not get ahead of ourselves. I am going to submit any further works as follow-ups, including:

  * Removing all python regex linters on the args, now that RPCMan can be used to generate any output, including the cli.cpp table
  * Auto-formatting and sanity checking the RPCExamples with RPCMan
  * Checking passed-in json in self-check. Removing redundant checks
  * Checking returned json against documentation to avoid regressions or false documentation
  * Compile the RPC documentation at compile-time to ensure it doesn't change at runtime and is completely static

  ### Bugs found

  * The assert identified issue #18607
  * The changes itself fixed bug #19250

ACKs for top commit:
  fjahr:
    tested ACK faaf9c58e4aa809019d4ca12747dd47411988e37
  promag:
    Tested ACK faaf9c58e4aa809019d4ca12747dd47411988e37.
  ryanofsky:
    Code review ACK faaf9c58e4aa809019d4ca12747dd47411988e37. Two obviously good simplifications.

Tree-SHA512: 5de3b440f7b2ed2c3e86655d4f0e2e5df9c67e8ce3c7817d5ea5311d1a38690f2f3e28fab41aad6936be9fc884326d037e5f19e85d4d2fe281474dada13911ee

6 files changed, 20 insertions, 51 deletions

diff --git a/src/qt/test/rpcnestedtests.cpp b/src/qt/test/rpcnestedtests.cpp
index de1fbcb94c..ea7b5f0c9e 100644
--- a/src/qt/test/rpcnestedtests.cpp
+++ b/src/qt/test/rpcnestedtests.cpp
@@ -14,17 +14,26 @@
 #include <QDir>
 #include <QtGlobal>
 
-static UniValue rpcNestedTest_rpc(const JSONRPCRequest& request)
+static RPCHelpMan rpcNestedTest_rpc()
 {
-    if (request.fHelp) {
-        return "help message";
-    }
-    return request.params.write(0, 0);
+    return RPCHelpMan{
+        "rpcNestedTest",
+        "echo the passed string(s)",
+        {
+            {"arg1", RPCArg::Type::STR, RPCArg::Optional::OMITTED, ""},
+            {"arg2", RPCArg::Type::STR, RPCArg::Optional::OMITTED, ""},
+            {"arg3", RPCArg::Type::STR, RPCArg::Optional::OMITTED, ""},
+        },
+        {},
+        RPCExamples{""},
+        [](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue {
+            return request.params.write(0, 0);
+        },
+    };
 }
 
-static const CRPCCommand vRPCCommands[] =
-{
-    { "test", "rpcNestedTest", &rpcNestedTest_rpc, {} },
+static const CRPCCommand vRPCCommands[] = {
+    {"test", "rpcNestedTest", &rpcNestedTest_rpc, {"arg1", "arg2", "arg3"}},
 };
 
 void RPCNestedTests::rpcNestedTests()
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 6522c0d73e..7d45ad9434 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -242,12 +242,7 @@ static RPCHelpMan generatetodescriptor()
 static RPCHelpMan generate()
 {
     return RPCHelpMan{"generate", "has been replaced by the -generate cli option. Refer to -help for more information.", {}, {}, RPCExamples{""}, [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue {
-
-    if (request.fHelp) {
-        throw std::runtime_error(self.ToString());
-    } else {
         throw JSONRPCError(RPC_METHOD_NOT_FOUND, self.ToString());
-    }
     }};
 }
 
diff --git a/src/rpc/misc.cpp b/src/rpc/misc.cpp
index 0c982317f5..b3102a236d 100644
--- a/src/rpc/misc.cpp
+++ b/src/rpc/misc.cpp
@@ -624,8 +624,6 @@ static RPCHelpMan echo(const std::string& name)
                 RPCExamples{""},
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
 {
-    if (request.fHelp) throw std::runtime_error(self.ToString());
-
     if (request.params[9].isStr()) {
         CHECK_NONFATAL(request.params[9].get_str() != "trigger_internal_bug");
     }
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index f98ea63782..e72ef24d12 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -288,10 +288,10 @@ static RPCHelpMan addnode()
     std::string strCommand;
     if (!request.params[1].isNull())
         strCommand = request.params[1].get_str();
-    if (request.fHelp || request.params.size() != 2 ||
-        (strCommand != "onetry" && strCommand != "add" && strCommand != "remove"))
+    if (strCommand != "onetry" && strCommand != "add" && strCommand != "remove") {
         throw std::runtime_error(
             self.ToString());
+    }
 
     NodeContext& node = EnsureNodeContext(request.context);
     if(!node.connman)
@@ -628,7 +628,7 @@ static RPCHelpMan setban()
     std::string strCommand;
     if (!request.params[1].isNull())
         strCommand = request.params[1].get_str();
-    if (request.fHelp || !help.IsValidNumArgs(request.params.size()) || (strCommand != "add" && strCommand != "remove")) {
+    if (strCommand != "add" && strCommand != "remove") {
         throw std::runtime_error(help.ToString());
     }
     NodeContext& node = EnsureNodeContext(request.context);
diff --git a/src/rpc/server.h b/src/rpc/server.h
index b2358ac5b2..7d13edb8b0 100644
--- a/src/rpc/server.h
+++ b/src/rpc/server.h
@@ -85,7 +85,6 @@ void RPCUnsetTimerInterface(RPCTimerInterface *iface);
  */
 void RPCRunLater(const std::string& name, std::function<void()> func, int64_t nSeconds);
 
-typedef UniValue(*rpcfn_type)(const JSONRPCRequest& jsonRequest);
 typedef RPCHelpMan (*RpcMethodFnType)();
 
 class CRPCCommand
@@ -116,14 +115,6 @@ public:
         CHECK_NONFATAL(fn().GetArgNames() == args_in);
     }
 
-    //! Simplified constructor taking plain rpcfn_type function pointer.
-    CRPCCommand(const char* category, const char* name, rpcfn_type fn, std::initializer_list<const char*> args)
-        : CRPCCommand(category, name,
-                      [fn](const JSONRPCRequest& request, UniValue& result, bool) { result = fn(request); return true; },
-                      {args.begin(), args.end()}, intptr_t(fn))
-    {
-    }
-
     std::string category;
     std::string name;
     Actor actor;
diff --git a/test/lint/lint-rpc-help.sh b/test/lint/lint-rpc-help.sh
deleted file mode 100755
index faac5d43e2..0000000000
--- a/test/lint/lint-rpc-help.sh
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/usr/bin/env bash
-#
-# Copyright (c) 2018 The Bitcoin Core developers
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-#
-# Check that all RPC help texts are generated by RPCHelpMan.
-
-export LC_ALL=C
-
-EXIT_CODE=0
-
-# Assume that all multiline strings passed into a runtime_error are help texts.
-# This is potentially fragile, but the linter is only temporary and can safely
-# be removed early 2019.
-
-non_autogenerated_help=$(grep --perl-regexp --null-data --only-matching 'runtime_error\(\n\s*".*\\n"\n' $(git ls-files -- "*.cpp"))
-if [[ ${non_autogenerated_help} != "" ]]; then
-    echo "Must use RPCHelpMan to generate the help for the following RPC methods:"
-    echo "${non_autogenerated_help}"
-    echo
-    EXIT_CODE=1
-fi
-exit ${EXIT_CODE}