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package selector
import (
"errors"
"io/ioutil"
"github.com/DCSO/balboa/observation"
lua "github.com/yuin/gopher-lua"
)
const (
luaInputObservationTypeName = "observation"
luaProcessObservationFunc = "process"
)
func init() {
err := RegisterSelector("lua", MakeLuaSelector)
if err != nil {
panic(err)
}
}
type LuaSelector struct {
luaScript string
ingest []string
L *lua.LState
}
func MakeLuaSelector(config interface{}) (selector Selector, err error) {
l := &LuaSelector{}
if configKV, ok := config.(map[interface{}]interface{}); ok {
if scriptOption, ok := configKV["script"]; ok {
scriptFile := scriptOption.(string)
scriptContent, err := ioutil.ReadFile(scriptFile)
if err != nil {
return nil, err
}
l.luaScript = string(scriptContent)
} else {
return nil, errors.New("type assertion failed")
}
if ingestListInterface, ok := configKV["ingest"]; ok {
if ingestList, ok := ingestListInterface.([]interface{}); ok {
for _, tag := range ingestList {
l.ingest = append(l.ingest, tag.(string))
}
} else {
return nil, errors.New("type assertion failed")
}
}
} else {
return nil, errors.New("type assertion failed")
}
if err = l.InitializeLua(); err != nil {
return nil, err
}
return l, nil
}
func checkObservation(L *lua.LState) *observation.InputObservation {
o := L.CheckUserData(1)
if v, ok := o.Value.(*observation.InputObservation); ok {
return v
}
L.ArgError(1, "observation expected")
return nil
}
func observationGetRcode(L *lua.LState) int {
o := checkObservation(L)
L.Push(lua.LString(o.Rcode))
return 1
}
func observationGetRdata(L *lua.LState) int {
o := checkObservation(L)
L.Push(lua.LString(o.Rdata))
return 1
}
func observationGetRrtype(L *lua.LState) int {
o := checkObservation(L)
L.Push(lua.LString(o.Rrtype))
return 1
}
func observationGetRrname(L *lua.LState) int {
o := checkObservation(L)
L.Push(lua.LString(o.Rrname))
return 1
}
func observationGetSensorId(L *lua.LState) int {
o := checkObservation(L)
L.Push(lua.LString(o.SensorID))
return 1
}
func observationGetTags(L *lua.LState) int {
o := checkObservation(L)
t := L.NewTable()
for tag, _ := range o.Tags {
t.Append(lua.LString(tag))
}
L.Push(t)
return 1
}
func observationAddTag(L *lua.LState) int {
o := checkObservation(L)
tag := L.ToString(2)
if tag != "" {
o.Tags[tag] = struct{}{}
}
return 0
}
var observationMethods = map[string]lua.LGFunction{
"rcode": observationGetRcode,
"rdata": observationGetRdata,
"rrtype": observationGetRrtype,
"rrname": observationGetRrname,
"sensor_id": observationGetSensorId,
"tags": observationGetTags,
"add_tag": observationAddTag,
}
func (l *LuaSelector) registerInputObservation() {
mt := l.L.NewTypeMetatable(luaInputObservationTypeName)
l.L.SetGlobal(luaInputObservationTypeName, mt)
l.L.SetField(mt, "__index", l.L.SetFuncs(l.L.NewTable(), observationMethods))
}
func (l *LuaSelector) InitializeLua() (err error) {
l.L = lua.NewState()
l.registerInputObservation()
err = l.L.DoString(l.luaScript)
return err
}
func (l *LuaSelector) Reinitialize() (err error) {
panic("implement me")
}
func (l *LuaSelector) ProcessObservation(observation *observation.InputObservation) (err error) {
fn := l.L.GetGlobal(luaProcessObservationFunc)
if err := l.L.CallByParam(lua.P{
Fn: fn,
NRet: 0,
Protect: true,
}, &lua.LUserData{
Value: observation,
Metatable: l.L.GetTypeMetatable(luaInputObservationTypeName),
}); err != nil {
return err
}
return err
}
func (l *LuaSelector) IngestionList() []string {
return l.ingest
}
|
