dnsdist: Add getTag()/setTag() Lua bindings for a DNSResponse

LuaWrapper doesn't support inheritance, so even though DNSResponse
inherits from the DNSQuestion object the bindings are not inherited.

diff --git a/pdns/dnsdist-lua-bindings-dnsquestion.cc b/pdns/dnsdist-lua-bindings-dnsquestion.cc
index fee1626cb89ff2171e2b404ae8c38c34a199ef67..1b4709cbfccd4e3820be2cc99babd32419421219 100644 (file)
--- a/pdns/dnsdist-lua-bindings-dnsquestion.cc
+++ b/pdns/dnsdist-lua-bindings-dnsquestion.cc
@@ -96,6 +96,7 @@ void setupLuaBindingsDNSQuestion()
       }
 #endif /* HAVE_NET_SNMP */
     });
+
   g_lua.registerFunction<void(DNSQuestion::*)(std::string, std::string)>("setTag", [](DNSQuestion& dq, const std::string& strLabel, const std::string& strValue) {
       if(dq.qTag == nullptr) {
         dq.qTag = std::make_shared<QTag>();
@@ -169,6 +170,44 @@ void setupLuaBindingsDNSQuestion()
       }
       return true;
     });
+
+  g_lua.registerFunction<void(DNSResponse::*)(std::string, std::string)>("setTag", [](DNSResponse& dr, const std::string& strLabel, const std::string& strValue) {
+      if(dr.qTag == nullptr) {
+        dr.qTag = std::make_shared<QTag>();
+      }
+      dr.qTag->insert({strLabel, strValue});
+    });
+
+  g_lua.registerFunction<void(DNSResponse::*)(vector<pair<string, string>>)>("setTagArray", [](DNSResponse& dr, const vector<pair<string, string>>&tags) {
+      if (!dr.qTag) {
+        dr.qTag = std::make_shared<QTag>();
+      }
+
+      for (const auto& tag : tags) {
+        dr.qTag->insert({tag.first, tag.second});
+      }
+    });
+  g_lua.registerFunction<string(DNSResponse::*)(std::string)>("getTag", [](const DNSResponse& dr, const std::string& strLabel) {
+      if (!dr.qTag) {
+        return string();
+      }
+
+      std::string strValue;
+      const auto it = dr.qTag->find(strLabel);
+      if (it == dr.qTag->cend()) {
+        return string();
+      }
+      return it->second;
+    });
+  g_lua.registerFunction<QTag(DNSResponse::*)(void)>("getTagArray", [](const DNSResponse& dr) {
+      if (!dr.qTag) {
+        QTag empty;
+        return empty;
+      }
+
+      return *dr.qTag;
+    });
+
   g_lua.registerFunction<void(DNSResponse::*)(std::string)>("sendTrap", [](const DNSResponse& dr, boost::optional<std::string> reason) {
 #ifdef HAVE_NET_SNMP
       if (g_snmpAgent && g_snmpTrapsEnabled) {