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reflect.go
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reflect.go
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package tasks
import (
"context"
"encoding/json"
"fmt"
"reflect"
"strings"
)
var (
typesMap = map[string]reflect.Type{
// base types
"bool": reflect.TypeOf(true),
"int": reflect.TypeOf(int(1)),
"int8": reflect.TypeOf(int8(1)),
"int16": reflect.TypeOf(int16(1)),
"int32": reflect.TypeOf(int32(1)),
"int64": reflect.TypeOf(int64(1)),
"uint": reflect.TypeOf(uint(1)),
"uint8": reflect.TypeOf(uint8(1)),
"uint16": reflect.TypeOf(uint16(1)),
"uint32": reflect.TypeOf(uint32(1)),
"uint64": reflect.TypeOf(uint64(1)),
"float32": reflect.TypeOf(float32(0.5)),
"float64": reflect.TypeOf(float64(0.5)),
"string": reflect.TypeOf(string("")),
// slices
"[]bool": reflect.TypeOf(make([]bool, 0)),
"[]int": reflect.TypeOf(make([]int, 0)),
"[]int8": reflect.TypeOf(make([]int8, 0)),
"[]int16": reflect.TypeOf(make([]int16, 0)),
"[]int32": reflect.TypeOf(make([]int32, 0)),
"[]int64": reflect.TypeOf(make([]int64, 0)),
"[]uint": reflect.TypeOf(make([]uint, 0)),
"[]uint8": reflect.TypeOf(make([]uint8, 0)),
"[]uint16": reflect.TypeOf(make([]uint16, 0)),
"[]uint32": reflect.TypeOf(make([]uint32, 0)),
"[]uint64": reflect.TypeOf(make([]uint64, 0)),
"[]float32": reflect.TypeOf(make([]float32, 0)),
"[]float64": reflect.TypeOf(make([]float64, 0)),
"[]string": reflect.TypeOf([]string{""}),
}
ctxType = reflect.TypeOf((*context.Context)(nil)).Elem()
typeConversionError = func(argValue interface{}, argTypeStr string) error {
return fmt.Errorf("%v is not %v", argValue, argTypeStr)
}
)
// ErrUnsupportedType ...
type ErrUnsupportedType struct {
valueType string
}
// NewErrUnsupportedType returns new ErrUnsupportedType
func NewErrUnsupportedType(valueType string) ErrUnsupportedType {
return ErrUnsupportedType{valueType}
}
// Error method so we implement the error interface
func (e ErrUnsupportedType) Error() string {
return fmt.Sprintf("%v is not one of supported types", e.valueType)
}
// ReflectValue converts interface{} to reflect.Value based on string type
func ReflectValue(valueType string, value interface{}) (reflect.Value, error) {
if strings.HasPrefix(valueType, "[]") {
return reflectValues(valueType, value)
}
return reflectValue(valueType, value)
}
// reflectValue converts interface{} to reflect.Value based on string type
// representing a base type (not a slice)
func reflectValue(valueType string, value interface{}) (reflect.Value, error) {
theType, ok := typesMap[valueType]
if !ok {
return reflect.Value{}, NewErrUnsupportedType(valueType)
}
theValue := reflect.New(theType)
// Booleans
if theType.String() == "bool" {
boolValue, err := getBoolValue(theType.String(), value)
if err != nil {
return reflect.Value{}, err
}
theValue.Elem().SetBool(boolValue)
return theValue.Elem(), nil
}
// Integers
if strings.HasPrefix(theType.String(), "int") {
intValue, err := getIntValue(theType.String(), value)
if err != nil {
return reflect.Value{}, err
}
theValue.Elem().SetInt(intValue)
return theValue.Elem(), err
}
// Unsigned integers
if strings.HasPrefix(theType.String(), "uint") {
uintValue, err := getUintValue(theType.String(), value)
if err != nil {
return reflect.Value{}, err
}
theValue.Elem().SetUint(uintValue)
return theValue.Elem(), err
}
// Floating point numbers
if strings.HasPrefix(theType.String(), "float") {
floatValue, err := getFloatValue(theType.String(), value)
if err != nil {
return reflect.Value{}, err
}
theValue.Elem().SetFloat(floatValue)
return theValue.Elem(), err
}
// Strings
if theType.String() == "string" {
stringValue, err := getStringValue(theType.String(), value)
if err != nil {
return reflect.Value{}, err
}
theValue.Elem().SetString(stringValue)
return theValue.Elem(), nil
}
return reflect.Value{}, NewErrUnsupportedType(valueType)
}
// reflectValues converts interface{} to reflect.Value based on string type
// representing a slice of values
func reflectValues(valueType string, value interface{}) (reflect.Value, error) {
theType, ok := typesMap[valueType]
if !ok {
return reflect.Value{}, NewErrUnsupportedType(valueType)
}
// For NULL we return an empty slice
if value == nil {
return reflect.MakeSlice(theType, 0, 0), nil
}
var theValue reflect.Value
// Booleans
if theType.String() == "[]bool" {
bools := reflect.ValueOf(value)
theValue = reflect.MakeSlice(theType, bools.Len(), bools.Len())
for i := 0; i < bools.Len(); i++ {
boolValue, err := getBoolValue(strings.Split(theType.String(), "[]")[1], bools.Index(i).Interface())
if err != nil {
return reflect.Value{}, err
}
theValue.Index(i).SetBool(boolValue)
}
return theValue, nil
}
// Integers
if strings.HasPrefix(theType.String(), "[]int") {
ints := reflect.ValueOf(value)
theValue = reflect.MakeSlice(theType, ints.Len(), ints.Len())
for i := 0; i < ints.Len(); i++ {
intValue, err := getIntValue(strings.Split(theType.String(), "[]")[1], ints.Index(i).Interface())
if err != nil {
return reflect.Value{}, err
}
theValue.Index(i).SetInt(intValue)
}
return theValue, nil
}
// Unsigned integers
if strings.HasPrefix(theType.String(), "[]uint") {
uints := reflect.ValueOf(value)
theValue = reflect.MakeSlice(theType, uints.Len(), uints.Len())
for i := 0; i < uints.Len(); i++ {
uintValue, err := getUintValue(strings.Split(theType.String(), "[]")[1], uints.Index(i).Interface())
if err != nil {
return reflect.Value{}, err
}
theValue.Index(i).SetUint(uintValue)
}
return theValue, nil
}
// Floating point numbers
if strings.HasPrefix(theType.String(), "[]float") {
floats := reflect.ValueOf(value)
theValue = reflect.MakeSlice(theType, floats.Len(), floats.Len())
for i := 0; i < floats.Len(); i++ {
floatValue, err := getFloatValue(strings.Split(theType.String(), "[]")[1], floats.Index(i).Interface())
if err != nil {
return reflect.Value{}, err
}
theValue.Index(i).SetFloat(floatValue)
}
return theValue, nil
}
// Strings
if theType.String() == "[]string" {
strs := reflect.ValueOf(value)
theValue = reflect.MakeSlice(theType, strs.Len(), strs.Len())
for i := 0; i < strs.Len(); i++ {
strValue, err := getStringValue(strings.Split(theType.String(), "[]")[1], strs.Index(i).Interface())
if err != nil {
return reflect.Value{}, err
}
theValue.Index(i).SetString(strValue)
}
return theValue, nil
}
return reflect.Value{}, NewErrUnsupportedType(valueType)
}
func getBoolValue(theType string, value interface{}) (bool, error) {
b, ok := value.(bool)
if !ok {
return false, typeConversionError(value, typesMap[theType].String())
}
return b, nil
}
func getIntValue(theType string, value interface{}) (int64, error) {
// We use https://golang.org/pkg/encoding/json/#Decoder.UseNumber when unmarshaling signatures.
// This is because JSON only supports 64-bit floating point numbers and we could lose precision
// when converting from float64 to signed integer
if strings.HasPrefix(fmt.Sprintf("%T", value), "json.Number") {
n, ok := value.(json.Number)
if !ok {
return 0, typeConversionError(value, typesMap[theType].String())
}
return n.Int64()
}
n, ok := value.(int64)
if !ok {
return 0, typeConversionError(value, typesMap[theType].String())
}
return n, nil
}
func getUintValue(theType string, value interface{}) (uint64, error) {
// We use https://golang.org/pkg/encoding/json/#Decoder.UseNumber when unmarshaling signatures.
// This is because JSON only supports 64-bit floating point numbers and we could lose precision
// when converting from float64 to unsigned integer
if strings.HasPrefix(fmt.Sprintf("%T", value), "json.Number") {
n, ok := value.(json.Number)
if !ok {
return 0, typeConversionError(value, typesMap[theType].String())
}
intVal, err := n.Int64()
if err != nil {
return 0, err
}
return uint64(intVal), nil
}
n, ok := value.(uint64)
if !ok {
return 0, typeConversionError(value, typesMap[theType].String())
}
return n, nil
}
func getFloatValue(theType string, value interface{}) (float64, error) {
// We use https://golang.org/pkg/encoding/json/#Decoder.UseNumber when unmarshaling signatures.
// This is because JSON only supports 64-bit floating point numbers and we could lose precision
if strings.HasPrefix(fmt.Sprintf("%T", value), "json.Number") {
n, ok := value.(json.Number)
if !ok {
return 0, typeConversionError(value, typesMap[theType].String())
}
return n.Float64()
}
f, ok := value.(float64)
if !ok {
return 0, typeConversionError(value, typesMap[theType].String())
}
return f, nil
}
func getStringValue(theType string, value interface{}) (string, error) {
s, ok := value.(string)
if !ok {
return "", typeConversionError(value, typesMap[theType].String())
}
return s, nil
}
// IsContextType checks to see if the type is a context.Context
func IsContextType(t reflect.Type) bool {
return t == ctxType
}