Example #1
0
// Given a variable definition, and any value of input, return a value which
// adheres to the variable definition, or throw an error.
func getVariableValue(schema Schema, definitionAST *ast.VariableDefinition, input interface{}) (interface{}, error) {
	ttype, err := typeFromAST(schema, definitionAST.Type)
	if err != nil {
		return nil, err
	}
	variable := definitionAST.Variable

	if ttype == nil || !IsInputType(ttype) {
		return "", gqlerrors.NewError(
			fmt.Sprintf(`Variable "$%v" expected value of type `+
				`"%v" which cannot be used as an input type.`, variable.Name.Value, printer.Print(definitionAST.Type)),
			[]ast.Node{definitionAST},
			"",
			nil,
			[]int{},
		)
	}

	if isValidInputValue(input, ttype) {
		if isNullish(input) {
			defaultValue := definitionAST.DefaultValue
			if defaultValue != nil {
				variables := map[string]interface{}{}
				val := valueFromAST(defaultValue, ttype, variables)
				return val, nil
			}
		}
		return coerceValue(ttype, input), nil
	}
	if isNullish(input) {
		return "", gqlerrors.NewError(
			fmt.Sprintf(`Variable "$%v" of required type `+
				`"%v" was not provided.`, variable.Name.Value, printer.Print(definitionAST.Type)),
			[]ast.Node{definitionAST},
			"",
			nil,
			[]int{},
		)
	}
	inputStr := ""
	b, err := json.Marshal(input)
	if err == nil {
		inputStr = string(b)
	}
	return "", gqlerrors.NewError(
		fmt.Sprintf(`Variable "$%v" expected value of type `+
			`"%v" but got: %v.`, variable.Name.Value, printer.Print(definitionAST.Type), inputStr),
		[]ast.Node{definitionAST},
		"",
		nil,
		[]int{},
	)
}
Example #2
0
func NewLocatedError(err interface{}, nodes []ast.Node) *gqlerrors.Error {
	message := "An unknown error occurred."
	if err, ok := err.(error); ok {
		message = err.Error()
	}
	if err, ok := err.(string); ok {
		message = err
	}
	stack := message
	return gqlerrors.NewError(
		message,
		nodes,
		stack,
		nil,
		[]int{},
	)
}