feat(dnsdist): Add getServerID function

Author: pieterlexis

pdns/dnsdistdist/dnsdist-console-completion.cc

@@ -382,6 +382,7 @@ static std::vector<dnsdist::console::completion::ConsoleKeyword> s_consoleKeywor
   {"chashed", false, "", "Consistent hashed ('sticky') distribution over available servers, also based on the server 'weight' parameter"},
   {"wrandom", false, "", "Weighted random over available servers, based on the server 'weight' parameter"},
   {"setServerID", true, "name", "Set the internal Server ID to this value"},
+  {"getServerID", true, "", "Get the internal Server ID as a string"},
 };
 
 #if defined(HAVE_LIBEDIT)

pdns/dnsdistdist/dnsdist-lua-bindings.cc

@@ -21,6 +21,7 @@
  */
 #include "bpf-filter.hh"
 #include "config.h"
+#include "dnsdist-configuration.hh"
 #include "dnsdist.hh"
 #include "dnsdist-async.hh"
 #include "dnsdist-dynblocks.hh"
@@ -1102,6 +1103,10 @@ void setupLuaBindings(LuaContext& luaCtx, bool client, bool configCheck)
     newThread.detach();
   });
 
+  luaCtx.writeFunction("getServerID", []() -> std::string {
+    return dnsdist::configuration::getCurrentRuntimeConfiguration().d_server_id;
+  });
+
   luaCtx.writeFunction("refreshRuntimeConfiguration", []() {
     dnsdist::configuration::refreshLocalRuntimeConfiguration();
   });