package main import ( "context" "errors" "github.com/yuin/gopher-lua" ) const luaAccountTypeName = "account" func luaContextGetAccounts(L *lua.LState) (map[int64]*Account, error) { var account_map map[int64]*Account ctx := L.Context() account_map, ok := ctx.Value(accountsContextKey).(map[int64]*Account) if !ok { user, ok := ctx.Value(userContextKey).(*User) if !ok { return nil, errors.New("Couldn't find User in lua's Context") } accounts, err := GetAccounts(user.UserId) if err != nil { return nil, err } account_map = make(map[int64]*Account) for i := range *accounts { account_map[(*accounts)[i].AccountId] = &(*accounts)[i] } ctx = context.WithValue(ctx, accountsContextKey, account_map) L.SetContext(ctx) } return account_map, nil } func luaGetAccounts(L *lua.LState) int { account_map, err := luaContextGetAccounts(L) if err != nil { panic("luaGetAccounts couldn't fetch accounts") } table := L.NewTable() for accountid := range account_map { table.RawSetInt(int(accountid), AccountToLua(L, account_map[accountid])) } L.Push(table) return 1 } // Registers my account type to given L. func luaRegisterAccounts(L *lua.LState) { mt := L.NewTypeMetatable(luaAccountTypeName) L.SetGlobal("account", mt) L.SetField(mt, "__index", L.NewFunction(luaAccount__index)) L.SetField(mt, "__tostring", L.NewFunction(luaAccount__tostring)) L.SetField(mt, "__eq", L.NewFunction(luaAccount__eq)) L.SetField(mt, "__metatable", lua.LString("protected")) getAccountsFn := L.NewFunction(luaGetAccounts) L.SetField(mt, "get_all", getAccountsFn) // also register the get_accounts function as a global in its own right L.SetGlobal("get_accounts", getAccountsFn) } func AccountToLua(L *lua.LState, account *Account) *lua.LUserData { ud := L.NewUserData() ud.Value = account L.SetMetatable(ud, L.GetTypeMetatable(luaAccountTypeName)) return ud } // Checks whether the first lua argument is a *LUserData with *Account and returns this *Account. func luaCheckAccount(L *lua.LState, n int) *Account { ud := L.CheckUserData(n) if account, ok := ud.Value.(*Account); ok { return account } L.ArgError(n, "account expected") return nil } func luaAccount__index(L *lua.LState) int { a := luaCheckAccount(L, 1) field := L.CheckString(2) switch field { case "AccountId", "accountid": L.Push(lua.LNumber(float64(a.AccountId))) case "Security", "security": security_map, err := luaContextGetSecurities(L) if err != nil { panic("account.security couldn't fetch securities") } if security, ok := security_map[a.SecurityId]; ok { L.Push(SecurityToLua(L, security)) } else { panic("SecurityId not in lua security_map") } case "Parent", "parent", "ParentAccount", "parentaccount": if a.ParentAccountId == -1 { L.Push(lua.LNil) } else { account_map, err := luaContextGetAccounts(L) if err != nil { panic("account.parent couldn't fetch accounts") } if parent, ok := account_map[a.ParentAccountId]; ok { L.Push(AccountToLua(L, parent)) } else { panic("ParentAccountId not in lua account_map") } } case "Name", "name": L.Push(lua.LString(a.Name)) case "Type", "type": L.Push(lua.LNumber(float64(a.Type))) default: L.ArgError(2, "unexpected account attribute: "+field) } return 1 } func luaAccount__tostring(L *lua.LState) int { a := luaCheckAccount(L, 1) account_map, err := luaContextGetAccounts(L) if err != nil { panic("luaGetAccounts couldn't fetch accounts") } full_name := a.Name for a.ParentAccountId != -1 { a = account_map[a.ParentAccountId] full_name = a.Name + "/" + full_name } L.Push(lua.LString(full_name)) return 1 } func luaAccount__eq(L *lua.LState) int { a := luaCheckAccount(L, 1) b := luaCheckAccount(L, 2) L.Push(lua.LBool(a.AccountId == b.AccountId)) return 1 }