/
plugins.go
291 lines (269 loc) · 8.24 KB
/
plugins.go
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package juggler
import (
"errors"
"fmt"
"reflect"
"strconv"
"github.com/combaine/combaine/repository"
"github.com/combaine/combaine/senders"
"github.com/combaine/combaine/utils"
"github.com/sirupsen/logrus"
lua "github.com/yuin/gopher-lua"
)
type dumperFunc func(reflect.Value) (lua.LValue, error)
func jPluginConfigToLuaTable(l *lua.LState, in repository.PluginConfig) (*lua.LTable, error) {
table := l.CreateTable(0, len(in))
for name, value := range in {
val, err := toLuaValue(l, value, dumperToLuaValue)
if err != nil {
return nil, err
}
table.RawSetString(name, val)
}
return table, nil
}
func dataToLuaTable(l *lua.LState, in []*senders.Payload) (*lua.LTable, error) {
out := l.CreateTable(len(in), 0)
for _, item := range in {
table := l.CreateTable(0, 2)
tags := l.CreateTable(0, len(item.Tags))
for k, v := range item.Tags {
tags.RawSetString(k, lua.LString(v))
}
table.RawSetString("Tags", tags)
val, err := toLuaValue(l, item.Result, dumperToLuaNumber)
if err != nil {
return nil, err
}
table.RawSetString("Result", val)
out.Append(table)
}
return out, nil
}
func toLuaValue(l *lua.LState, v interface{}, dumper dumperFunc) (lua.LValue, error) {
rv := reflect.ValueOf(v)
switch rv.Kind() {
case reflect.Slice, reflect.Array:
if s, ok := v.([]byte); ok {
return dumper(reflect.ValueOf(string(s)))
}
inTable := l.CreateTable(rv.Len(), 0)
for i := 0; i < rv.Len(); i++ {
item := rv.Index(i).Interface()
v, err := toLuaValue(l, item, dumper)
if err != nil {
return nil, err
}
inTable.Append(v)
}
return inTable, nil
case reflect.Map:
keys := rv.MapKeys()
inTable := l.CreateTable(0, len(keys))
for _, key := range keys {
item := rv.MapIndex(key).Interface()
v, err := toLuaValue(l, item, dumper)
if err != nil {
return nil, err
}
inTable.RawSetString(fmt.Sprintf("%s", key), v)
}
return inTable, nil
case reflect.Struct:
numField := rv.NumField()
inTable := l.CreateTable(0, numField)
for i := 0; i < numField; i++ {
if !rv.Field(i).CanInterface() {
continue
}
item := rv.Field(i).Interface()
v, err := toLuaValue(l, item, dumper)
if err != nil {
return nil, err
}
inTable.RawSetString(rv.Type().Field(i).Name, v)
}
return inTable, nil
default:
return dumper(rv)
}
}
func dumperToLuaNumber(value reflect.Value) (ret lua.LValue, err error) {
switch value.Kind() {
case reflect.Float32, reflect.Float64:
ret = lua.LNumber(value.Float())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
ret = lua.LNumber(float64(value.Int()))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
ret = lua.LNumber(float64(value.Uint()))
case reflect.String:
var num float64
num, err = strconv.ParseFloat(value.String(), 64)
if err == nil {
ret = lua.LNumber(num)
}
default:
err = fmt.Errorf("value %s is Not a Number: %v", value.Kind(), value)
}
return
}
func dumperToLuaValue(value reflect.Value) (ret lua.LValue, err error) {
switch value.Kind() {
case reflect.Float32, reflect.Float64:
ret = lua.LNumber(value.Float())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
ret = lua.LNumber(value.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
ret = lua.LNumber(value.Uint())
case reflect.String:
ret = lua.LString(value.String())
case reflect.Bool:
ret = lua.LBool(value.Bool())
default:
err = fmt.Errorf("Unexpected value %s: %v", value.Kind(), value)
}
return
}
// luaResultToJugglerEvents convert well known type of lua plugin result
// in to go types
func (js *Sender) luaResultToJugglerEvents(result *lua.LTable) ([]jugglerEvent, error) {
if result == nil {
return nil, errors.New("lua plugin result is nil")
}
errs := make(map[string]string, 0)
var events []jugglerEvent
result.ForEach(func(k lua.LValue, v lua.LValue) {
lt, ok := v.(*lua.LTable)
if !ok {
errs[fmt.Sprintf("Failed to convert: result[%s]=%s is not lua table",
lua.LVAsString(k), lua.LVAsString(v))] = ""
return
}
je := jugglerEvent{}
tags, ok := lt.RawGetString("tags").(*lua.LTable)
if !ok {
errs[fmt.Sprintf("Failed to get tags from lua result[%s]", lua.LVAsString(k))] = ""
return
}
je.taskTags = make(map[string]string, 0)
tags.ForEach(func(tk lua.LValue, tv lua.LValue) {
je.taskTags[lua.LVAsString(tk)] = lua.LVAsString(tv)
})
name, ok := je.taskTags["name"]
if !ok {
errs[fmt.Sprintf("Missing tag name in %v", je)] = ""
return
}
if _, ok := je.taskTags["type"]; !ok {
errs[fmt.Sprintf("Missing tag type for %s", name)] = ""
return
}
subgroup, err := utils.GetSubgroupName(je.taskTags)
if err != nil {
errs[fmt.Sprintf("Failed to get subgroup for %s: %s", name, err)] = ""
return
}
// set je.Host, we want set js.Host-subgroup
// see utils.GetSubgroupName implementation for futher details
je.Host = js.Host + "-" + subgroup
if je.Description = lua.LVAsString(lt.RawGetString("description")); je.Description == "" {
je.Description = "no trigger description"
}
if je.Service = lua.LVAsString(lt.RawGetString("service")); je.Service == "" {
je.Service = "UnknownServce"
}
if lvl := lt.RawGetString("level"); lvl != lua.LNil {
je.Status = lua.LVAsString(lvl)
} else {
logrus.Errorf("%s Missing level in %s plugin result, force status to OK", js.id, js.Plugin)
je.Status = "OK"
je.Description = je.Description + " (force OK)"
}
events = append(events, je)
})
if len(errs) > 0 {
return nil, fmt.Errorf("%s", errs)
}
return events, nil
}
// LoadPlugin cleanup lua state global/local environment
// and load lua plugin by name from juggler config section
func LoadPlugin(id, dir, name string) (*lua.LState, error) {
file := dir + "/" + name + ".lua"
l := lua.NewState()
if err := PreloadTools(id, l); err != nil {
return nil, err
}
if err := l.DoFile(file); err != nil {
return nil, err
}
// TODO: overwrite/cleanup globals in lua plugin?
// cache lua state in plugin cache?
return l, nil
}
// preparePluginEnv add data from aggregate task as global variable in lua
// plugin. Also inject juggler conditions from juggler configs and plugin config
func (js *Sender) preparePluginEnv(task *senders.SenderTask) error {
ltable, err := dataToLuaTable(js.state, task.Data)
if err != nil {
return fmt.Errorf("Failed to convert Payload to lua table: %s", err)
}
js.state.SetGlobal("payload", ltable)
// only half of task deadline allowed for sending events history
deadline := task.PrevTime + (task.CurrTime-task.PrevTime)/2
// this value passed to plugin_store Push method
js.state.SetGlobal("storeDeadline", lua.LNumber(deadline))
js.state.SetGlobal("checkName", lua.LString(js.Config.CheckName))
js.state.SetGlobal("checkDescription", lua.LString(js.Config.Description))
js.state.SetGlobal("checkTTL", lua.LNumber(js.Config.TTL))
// variables
lvariables := js.state.CreateTable(0, len(js.Config.Variables))
for k, v := range js.Config.Variables {
lvariables.RawSetString(k, lua.LString(v))
}
js.state.SetGlobal("variables", lvariables)
// conditions
levels := make(map[string][]string)
if js.OK != nil {
levels["OK"] = js.OK
}
if js.INFO != nil {
levels["INFO"] = js.INFO
}
if js.WARN != nil {
levels["WARN"] = js.WARN
}
if js.CRIT != nil {
levels["CRIT"] = js.CRIT
}
lconditions := js.state.CreateTable(0, len(levels))
for name, cond := range levels {
lcondTable := js.state.CreateTable(len(cond), 0)
for _, v := range cond {
lcondTable.Append(lua.LString(v))
}
lconditions.RawSetString(name, lcondTable)
}
js.state.SetGlobal("conditions", lconditions)
// config
lconfig, err := jPluginConfigToLuaTable(js.state, js.JPluginConfig)
if err != nil {
return err
}
js.state.SetGlobal("config", lconfig)
return nil
}
// runPlugin run lua plugin with prepared environment
// collect, convert and return plugin result
func (js *Sender) runPlugin() ([]jugglerEvent, error) {
js.state.Push(js.state.GetGlobal("run"))
if err := js.state.PCall(0, 1, nil); err != nil {
return nil, fmt.Errorf("Expected 'run' function inside plugin: %s", err)
}
result := js.state.ToTable(1)
events, err := js.luaResultToJugglerEvents(result)
if err != nil {
return nil, err
}
return events, nil
}