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Copy pathengine.go
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175 lines (150 loc) · 3.9 KB
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package script
import (
"encoding/json"
"fmt"
"os"
"path/filepath"
"strings"
"sync"
tengo "github.com/d5/tengo/v2"
"github.com/d5/tengo/v2/stdlib"
"dbikeserver/ble"
"dbikeserver/db"
"dbikeserver/gpio"
"dbikeserver/script/builtins"
"dbikeserver/util"
)
type Engine struct {
nc *ble.NotifyCharacteristic
db *db.DB
gpio *gpio.GPIO
scripts map[string]*tengo.Compiled
stateMu sync.RWMutex
state map[string]tengo.Object
}
func NewEngine(nc *ble.NotifyCharacteristic, database *db.DB, gp *gpio.GPIO, dir string) (*Engine, error) {
e := &Engine{
nc: nc,
db: database,
gpio: gp,
scripts: make(map[string]*tengo.Compiled),
state: make(map[string]tengo.Object),
}
pairs, err := database.Scan("state:")
if err == nil {
for _, pair := range pairs {
key := strings.TrimPrefix(string(pair[0]), "state:")
var v any
if json.Unmarshal(pair[1], &v) == nil {
e.state[key] = builtins.GoToTengo(v)
}
}
if len(pairs) > 0 {
util.Logf("script: restored %d state entries from db", len(pairs))
}
}
entries, err := os.ReadDir(dir)
if os.IsNotExist(err) {
util.Logf("script: directory %q not found; no scripts loaded", dir)
return e, nil
}
if err != nil {
return nil, fmt.Errorf("script: read dir %q: %w", dir, err)
}
for _, entry := range entries {
if entry.IsDir() || !strings.HasSuffix(entry.Name(), ".tengo") {
continue
}
topic := strings.TrimSuffix(entry.Name(), ".tengo")
src, err := os.ReadFile(filepath.Join(dir, entry.Name()))
if err != nil {
return nil, fmt.Errorf("script: read %q: %w", entry.Name(), err)
}
compiled, err := e.compile(topic, src)
if err != nil {
return nil, fmt.Errorf("script: compile %q: %w", entry.Name(), err)
}
e.scripts[topic] = compiled
util.Logf("script: loaded handler for topic %q", topic)
}
return e, nil
}
func (e *Engine) compile(topic string, src []byte) (*tengo.Compiled, error) {
s := tengo.NewScript(src)
s.SetImports(stdlib.GetModuleMap(stdlib.AllModuleNames()...))
if err := s.Add("notify", e.notifyFunc()); err != nil {
return nil, err
}
for _, fn := range builtins.StateFuncs(e.state, &e.stateMu, e.db) {
if err := s.Add(fn.Name, fn); err != nil {
return nil, err
}
}
for _, fn := range builtins.DBFuncs(e.db) {
if err := s.Add(fn.Name, fn); err != nil {
return nil, err
}
}
for _, fn := range builtins.GPIOFuncs(e.gpio) {
if err := s.Add(fn.Name, fn); err != nil {
return nil, err
}
}
for _, fn := range builtins.All() {
if err := s.Add(fn.Name, fn); err != nil {
return nil, err
}
}
for name, val := range builtins.Vars() {
if err := s.Add(name, val); err != nil {
return nil, err
}
}
if err := s.Add("payload", map[string]interface{}{}); err != nil {
return nil, err
}
if err := s.Add("topic", topic); err != nil {
return nil, err
}
return s.Compile()
}
func (e *Engine) HandleEvent(topic string, payload map[string]any) bool {
compiled, ok := e.scripts[topic]
if !ok {
return false
}
c := compiled.Clone()
if err := c.Set("payload", payload); err != nil {
util.Logf("script: set payload for %q: %v", topic, err)
}
if err := c.Set("topic", topic); err != nil {
util.Logf("script: set topic for %q: %v", topic, err)
}
if err := c.Run(); err != nil {
util.Logf("script: run %q: %v", topic, err)
}
return true
}
func (e *Engine) notifyFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "notify",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) < 1 {
return tengo.UndefinedValue, nil
}
topicObj, ok := args[0].(*tengo.String)
if !ok {
return tengo.UndefinedValue, fmt.Errorf("notify: first argument must be a string")
}
topic := topicObj.Value
payload := map[string]any{}
if len(args) >= 2 {
if m, ok := args[1].(*tengo.Map); ok {
payload = builtins.TengoMapToGo(m)
}
}
e.nc.Notify(topic, payload)
return tengo.UndefinedValue, nil
},
}
}