refactor(lua): 提取 API 注册辅助函数

新增 RegisterAPIMethods 和 RegisterUnsafeAPI 函数，简化 Lua API 批量注册逻辑。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/lua/api_ctx.go

@@ -19,8 +19,13 @@ func RegisterNgxCtxAPI(L *glua.LState, ngxTable *glua.LTable) {
 func RegisterSchedulerUnsafeCtxAPI(L *glua.LState, ngx *glua.LTable) {
 	ctxTable := L.NewTable()
 	mt := L.NewTable()
-	mt.RawSetString("__index", L.NewFunction(luaSchedulerUnsafeCtx))
-	mt.RawSetString("__newindex", L.NewFunction(luaSchedulerUnsafeCtx))
+
+	methods := []APIMethod{
+		{Name: "__index", Func: luaSchedulerUnsafeCtx},
+		{Name: "__newindex", Func: luaSchedulerUnsafeCtx},
+	}
+	RegisterAPIMethods(L, mt, methods)
+
 	L.SetMetatable(ctxTable, mt)
 	ngx.RawSetString("ctx", ctxTable)
 }

internal/lua/api_req.go

@@ -570,24 +570,17 @@ func (api *ngxReqAPI) ResetMetrics() {
 
 // RegisterSchedulerUnsafeReqAPI 为 Scheduler LState 注册不安全的 ngx.req API
 func RegisterSchedulerUnsafeReqAPI(L *glua.LState, ngx *glua.LTable) {
-	ngxReq := L.NewTable()
-
-	ngxReq.RawSetString("get_method", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("get_uri", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("set_uri", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("get_uri_args", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("set_uri_args", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("get_headers", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("set_header", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("clear_header", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("get_body_data", L.NewFunction(luaSchedulerUnsafeReq))
-	ngxReq.RawSetString("read_body", L.NewFunction(luaSchedulerUnsafeReq))
-
-	ngx.RawSetString("req", ngxReq)
-}
-
-// luaSchedulerUnsafeReq 在 scheduler 模式下调用 ngx.req API 时返回错误
-func luaSchedulerUnsafeReq(L *glua.LState) int {
-	L.RaiseError("API ngx.req not available in timer callback context")
-	return 0
+	methods := []string{
+		"get_method",
+		"get_uri",
+		"set_uri",
+		"get_uri_args",
+		"set_uri_args",
+		"get_headers",
+		"set_header",
+		"clear_header",
+		"get_body_data",
+		"read_body",
+	}
+	RegisterUnsafeAPI(L, ngx, "ngx.req", methods)
 }

internal/lua/api_resp.go

@@ -201,19 +201,12 @@ func (api *ngxRespAPI) SetHeader(name, value string) {
 
 // RegisterSchedulerUnsafeRespAPI 为 Scheduler LState 注册不安全的 ngx.resp API
 func RegisterSchedulerUnsafeRespAPI(L *glua.LState, ngx *glua.LTable) {
-	ngxResp := L.NewTable()
-
-	ngxResp.RawSetString("get_status", L.NewFunction(luaSchedulerUnsafeResp))
-	ngxResp.RawSetString("set_status", L.NewFunction(luaSchedulerUnsafeResp))
-	ngxResp.RawSetString("get_headers", L.NewFunction(luaSchedulerUnsafeResp))
-	ngxResp.RawSetString("set_header", L.NewFunction(luaSchedulerUnsafeResp))
-	ngxResp.RawSetString("clear_header", L.NewFunction(luaSchedulerUnsafeResp))
-
-	ngx.RawSetString("resp", ngxResp)
-}
-
-// luaSchedulerUnsafeResp 在 scheduler 模式下调用 ngx.resp API 时返回错误
-func luaSchedulerUnsafeResp(L *glua.LState) int {
-	L.RaiseError("API ngx.resp not available in timer callback context")
-	return 0
+	methods := []string{
+		"get_status",
+		"set_status",
+		"get_headers",
+		"set_header",
+		"clear_header",
+	}
+	RegisterUnsafeAPI(L, ngx, "ngx.resp", methods)
 }

internal/lua/register.go

@@ -0,0 +1,29 @@
+// Package lua 提供 Lua API 注册辅助函数
+package lua
+
+import glua "github.com/yuin/gopher-lua"
+
+// APIMethod 表示一个 Lua API 方法
+type APIMethod struct {
+	Name string
+	Func func(*glua.LState) int
+}
+
+// RegisterAPIMethods 批量注册 API 方法到 Lua 表
+func RegisterAPIMethods(L *glua.LState, tbl *glua.LTable, methods []APIMethod) {
+	for _, m := range methods {
+		tbl.RawSetString(m.Name, L.NewFunction(m.Func))
+	}
+}
+
+// RegisterUnsafeAPI 注册不可用于 timer context 的安全桩
+func RegisterUnsafeAPI(L *glua.LState, ngx *glua.LTable, apiName string, methods []string) {
+	tbl := L.NewTable()
+	for _, m := range methods {
+		tbl.RawSetString(m, L.NewFunction(func(L *glua.LState) int {
+			L.RaiseError("API %s.%s not available in timer callback context", apiName, m)
+			return 0
+		}))
+	}
+	ngx.RawSetString(apiName, tbl)
+}