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vars.go
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vars.go
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package lyml
import (
"context"
"encoding/json"
"fmt"
"net/http"
"os"
"path/filepath"
"regexp"
"runtime"
"sync"
"get.pme.sh/pmesh/config"
"get.pme.sh/pmesh/cpuhist"
"get.pme.sh/pmesh/luae"
"get.pme.sh/pmesh/util"
"github.com/samber/lo"
lua "github.com/yuin/gopher-lua"
"gopkg.in/yaml.v3"
)
// Global variables.
var variables = sync.Map{} // string -> lua.LValue
func SetVar(key string, value any) error {
v, err := luae.MarshalLua(value)
if err != nil {
return fmt.Errorf("failed to marshal var %q: %w", key, err)
}
variables.Store(key, v)
return nil
}
func SetVars(vars map[string]any) error {
for k, v := range vars {
if err := SetVar(k, v); err != nil {
return err
}
}
return nil
}
// luae.DynTable for environment variables.
type envTable struct{}
func (e envTable) Get(L *lua.LState, key string) (value any, ok bool) {
return os.LookupEnv(key)
}
func (e envTable) Set(L *lua.LState, key string, value lua.LValue) error {
var str string
if err := luae.UnmarshalLua(L, value, &str); err != nil {
return err
}
return os.Setenv(key, str)
}
// Initializes global variables.
var initGlobals = sync.OnceFunc(func() {
SetVars(map[string]any{
"env": luae.DynTable(envTable{}),
"fetch": func(l *lua.LState, url string) json.RawMessage {
req, err := http.NewRequestWithContext(l.Context(), http.MethodGet, url, nil)
if err != nil {
e, _ := json.Marshal(map[string]any{"error": err.Error()})
return e
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
e, _ := json.Marshal(map[string]any{"error": err.Error()})
return e
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
e, _ := json.Marshal(map[string]any{
"error": resp.Status,
"code": resp.StatusCode,
})
return e
}
var res json.RawMessage
e := json.NewDecoder(resp.Body).Decode(&res)
if e != nil {
e, _ := json.Marshal(map[string]any{"error": e.Error()})
return e
}
return res
},
"HOST": config.Get().Host,
"MACH": config.GetMachineID().String(),
"IMACH": uint32(config.GetMachineID()),
"OS": runtime.GOOS,
"ARCH": runtime.GOARCH,
"PID": os.Getpid(),
"PPID": os.Getppid(),
"USER": os.Getuid(),
"CPU": cpuhist.NumCPU,
"RAM": util.GetTotalMemory(),
"args": os.Args,
"ud": config.Get().PeerUD,
"localud": config.Get().LocalUD,
"match": func(str, rgx string) (bool, error) {
expr, err := regexp.Compile(rgx)
if err != nil {
return false, err
}
return expr.MatchString(str), nil
},
"glob": func(pattern string) ([]string, error) {
return filepath.Glob(pattern)
},
"parse": func(vm *lua.LState, path string) (res any, err error) {
// Read the file and parse it.
//
data, err := os.ReadFile(path)
if err != nil {
return nil, err
}
// Evaluate the node.
//
withWd(filepath.Dir(path), func() {
var node *yaml.Node
node, err = unmarshal(vm, data)
if err == nil {
err = node.Decode(&res)
}
})
return
},
})
})
// Adds a variable to the context.
type variableKey string
func WithVar(ctx context.Context, key string, value any) context.Context {
lv := lo.Must(luae.MarshalLua(value))
return context.WithValue(ctx, variableKey(key), lv)
}
// Gets a variable from the context.
func GetVar(ctx context.Context, key string) lua.LValue {
v := ctx.Value(variableKey(key))
if v == nil {
v, _ = variables.Load(key)
}
if v == nil {
return nil
}
return v.(lua.LValue)
}
// Creates a metatable that indexes globals and contextual variables.
var contextualLookup = luae.NewFunc(func(l *lua.LState) int {
if v := GetVar(l.Context(), l.ToString(2)); v != nil {
l.Push(v)
return 1
}
return 0
})
func NewContextMetatable() *lua.LTable {
initGlobals()
meta := &lua.LTable{}
meta.RawSetString("__index", contextualLookup)
return meta
}
// Creates a new VM with a context.
func NewContextVM(ctx context.Context) *lua.LState {
vm := lua.NewState(lua.Options{
IncludeGoStackTrace: true,
})
vm.SetContext(ctx)
vm.G.Global.Metatable = NewContextMetatable()
return vm
}