add initial support for lua scripts

internal/server/sv1/handle.go

@@ -1,13 +1,99 @@
 package sv1
 
 import (
+	"log/slog"
 	"net/http"
+	"os"
+	"path/filepath"
 
+	"github.com/akyaiy/GoSally-mvp/internal/core/utils"
 	"github.com/akyaiy/GoSally-mvp/internal/server/rpc"
+	lua "github.com/yuin/gopher-lua"
 )
 
 func (h *HandlerV1) Handle(r *http.Request, req *rpc.RPCRequest) *rpc.RPCResponse {
-	return rpc.NewResponse("Hi", req.ID) // test answer to make sure everything works
+	if req.Method == "" {
+		h.log.Info("invalid request received", slog.String("issue", rpc.ErrMethodNotFoundS), slog.String("requested-method", req.Method))
+		return rpc.NewError(rpc.ErrMethodIsMissing, rpc.ErrMethodIsMissingS, req.ID)
+	}
+
+	method, err := h.resolveMethodPath(req.Method)
+	if err != nil {
+		if err.Error() == rpc.ErrInvalidMethodFormatS {
+			h.log.Info("invalid request received", slog.String("issue", rpc.ErrInvalidMethodFormatS), slog.String("requested-method", req.Method))
+			return rpc.NewError(rpc.ErrInvalidMethodFormat, rpc.ErrInvalidMethodFormatS, req.ID)
+		} else if err.Error() == rpc.ErrMethodNotFoundS {
+			h.log.Info("invalid request received", slog.String("issue", rpc.ErrMethodNotFoundS), slog.String("requested-method", req.Method))
+			return rpc.NewError(rpc.ErrMethodNotFound, rpc.ErrMethodNotFoundS, req.ID)
+		}
+	}
+
+	return h.HandleLUA(method, req)
+}
+
+func (h *HandlerV1) HandleLUA(path string, req *rpc.RPCRequest) *rpc.RPCResponse {
+	L := lua.NewState()
+	defer L.Close()
+
+	inTable := L.NewTable()
+	paramsTable := L.NewTable()
+	if fetchedParams, ok := req.Params.(map[string]interface{}); ok {
+		for k, v := range fetchedParams {
+			L.SetField(paramsTable, k, utils.ConvertGolangTypesToLua(L, v))
+		}
+	}
+	L.SetField(inTable, "Params", paramsTable)
+	L.SetGlobal("In", inTable)
+
+	outTable := L.NewTable()
+	resultTable := L.NewTable()
+	L.SetField(outTable, "Result", resultTable)
+	L.SetGlobal("Out", outTable)
+
+	prep := filepath.Join(h.cfg.ComDir, "_prepare.lua")
+	if _, err := os.Stat(prep); err == nil {
+		if err := L.DoFile(prep); err != nil {
+			return rpc.NewError(rpc.ErrInternalError, err.Error(), req.ID)
+		}
+	}
+	if err := L.DoFile(path); err != nil {
+		return rpc.NewError(rpc.ErrInternalError, err.Error(), req.ID)
+	}
+
+	lv := L.GetGlobal("Out")
+	outTbl, ok := lv.(*lua.LTable)
+	if !ok {
+		return rpc.NewError(rpc.ErrInternalError, "Out is not a table", req.ID)
+	}
+
+	// Check if Out.Error exists
+	if errVal := outTbl.RawGetString("Error"); errVal != lua.LNil {
+		if errTbl, ok := errVal.(*lua.LTable); ok {
+			code := rpc.ErrInternalError
+			message := "Internal script error"
+			if c := errTbl.RawGetString("code"); c.Type() == lua.LTNumber {
+				code = int(c.(lua.LNumber))
+			}
+			if msg := errTbl.RawGetString("message"); msg.Type() == lua.LTString {
+				message = msg.String()
+			}
+			return rpc.NewError(code, message, req.ID)
+		}
+		return rpc.NewError(rpc.ErrInternalError, "Out.Error is not a table", req.ID)
+	}
+
+	// Otherwise, parse Out.Result
+	resultVal := outTbl.RawGetString("Result")
+	resultTbl, ok := resultVal.(*lua.LTable)
+	if !ok {
+		return rpc.NewError(rpc.ErrInternalError, "Out.Result is not a table", req.ID)
+	}
+
+	out := make(map[string]any)
+	resultTbl.ForEach(func(key lua.LValue, value lua.LValue) {
+		out[key.String()] = utils.ConvertLuaTypesToGolang(value)
+	})
+	return rpc.NewResponse(out, req.ID)
 }
 
 // func (h *HandlerV1) Handle(w http.ResponseWriter, r *http.Request) {