Constrain rpcport default values to a single location in code

src/bitcoin-cli.cpp

@@ -34,7 +34,7 @@ std::string HelpMessageCli()
     strUsage += HelpMessageOpt("-datadir=<dir>", _("Specify data directory"));
     AppendParamsHelpMessages(strUsage);
     strUsage += HelpMessageOpt("-rpcconnect=<ip>", strprintf(_("Send commands to node running on <ip> (default: %s)"), DEFAULT_RPCCONNECT));
-    strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Connect to JSON-RPC on <port> (default: %u or testnet: %u)"), 8332, 18332));
+    strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Connect to JSON-RPC on <port> (default: %u or testnet: %u)"), BaseParams(CBaseChainParams::MAIN).RPCPort(), BaseParams(CBaseChainParams::TESTNET).RPCPort()));
     strUsage += HelpMessageOpt("-rpcwait", _("Wait for RPC server to start"));
     strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));
     strUsage += HelpMessageOpt("-rpcpassword=<pw>", _("Password for JSON-RPC connections"));

src/chainparamsbase.cpp

@@ -86,18 +86,23 @@ const CBaseChainParams& BaseParams()
     return *pCurrentBaseParams;
 }
 
-void SelectBaseParams(const std::string& chain)
+CBaseChainParams& BaseParams(const std::string& chain)
 {
     if (chain == CBaseChainParams::MAIN)
-        pCurrentBaseParams = &mainParams;
+        return mainParams;
     else if (chain == CBaseChainParams::TESTNET)
-        pCurrentBaseParams = &testNetParams;
+        return testNetParams;
     else if (chain == CBaseChainParams::REGTEST)
-        pCurrentBaseParams = &regTestParams;
+        return regTestParams;
     else
         throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
 }
 
+void SelectBaseParams(const std::string& chain)
+{
+    pCurrentBaseParams = &BaseParams(chain);
+}
+
 std::string ChainNameFromCommandLine()
 {
     bool fRegTest = GetBoolArg("-regtest", false);

src/chainparamsbase.h

@@ -42,6 +42,8 @@ void AppendParamsHelpMessages(std::string& strUsage, bool debugHelp=true);
  */
 const CBaseChainParams& BaseParams();
 
+CBaseChainParams& BaseParams(const std::string& chain);
+
 /** Sets the params returned by Params() to those for the given network. */
 void SelectBaseParams(const std::string& chain);
 

src/init.cpp

@@ -491,7 +491,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));
     strUsage += HelpMessageOpt("-rpcpassword=<pw>", _("Password for JSON-RPC connections"));
     strUsage += HelpMessageOpt("-rpcauth=<userpw>", _("Username and hashed password for JSON-RPC connections. The field <userpw> comes in the format: <USERNAME>:<SALT>$<HASH>. A canonical python script is included in share/rpcuser. This option can be specified multiple times"));
-    strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Listen for JSON-RPC connections on <port> (default: %u or testnet: %u)"), 8332, 18332));
+    strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Listen for JSON-RPC connections on <port> (default: %u or testnet: %u)"), BaseParams(CBaseChainParams::MAIN).RPCPort(), BaseParams(CBaseChainParams::TESTNET).RPCPort()));
     strUsage += HelpMessageOpt("-rpcallowip=<ip>", _("Allow JSON-RPC connections from specified source. Valid for <ip> are a single IP (e.g. 1.2.3.4), a network/netmask (e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24). This option can be specified multiple times"));
     strUsage += HelpMessageOpt("-rpcthreads=<n>", strprintf(_("Set the number of threads to service RPC calls (default: %d)"), DEFAULT_HTTP_THREADS));
     if (showDebug) {