// Helper fuctions
func nullFunc(helper *structure.Helper, values *structure.RequestData) []byte {
// Check if the helper was defined in a plugin
if plugins.LuaPool != nil {
// Get a state map to execute and attach it to the request data
if values.PluginVMs == nil {
values.PluginVMs = plugins.LuaPool.Get(helper, values)
}
if values.PluginVMs[helper.Name] != nil {
pluginResult, err := plugins.Execute(helper, values)
if err != nil {
return []byte{}
}
return evaluateEscape(pluginResult, helper.Unescaped)
} else {
// This helper is not implemented in a plugin. Get rid of the Lua VMs
plugins.LuaPool.Put(values.PluginVMs)
values.PluginVMs = nil
}
}
log.Println("Warning: This helper is not implemented:", helper.Name)
return []byte{}
}
func Execute(helper *structure.Helper, values *structure.RequestData) ([]byte, error) {
// Retrieve the lua state
vm := values.PluginVMs[helper.Name]
// Execute plugin
err := vm.CallByParam(lua.P{Fn: vm.GetGlobal(helper.Name), NRet: 1, Protect: true})
if err != nil {
log.Println("Error while executing plugin for helper "+helper.Name+":", err)
// Since the vm threw an error, close all vms and don't put the map back into the pool
for _, luavm := range values.PluginVMs {
luavm.Close()
}
values.PluginVMs = nil
return []byte{}, err
}
// Get return value from vm
ret := vm.ToString(-1)
return []byte(ret), nil
}