traefik/vendor/github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute/converter.go

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package dynamodbattribute
import (
"bytes"
"encoding/json"
"fmt"
"reflect"
"runtime"
"strconv"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/dynamodb"
)
// ConvertToMap accepts a map[string]interface{} or struct and converts it to a
// map[string]*dynamodb.AttributeValue.
//
// If in contains any structs, it is first JSON encoded/decoded it to convert it
// to a map[string]interface{}, so `json` struct tags are respected.
//
// Deprecated: Use MarshalMap instead
func ConvertToMap(in interface{}) (item map[string]*dynamodb.AttributeValue, err error) {
defer func() {
if r := recover(); r != nil {
if e, ok := r.(runtime.Error); ok {
err = e
} else if s, ok := r.(string); ok {
err = fmt.Errorf(s)
} else {
err = r.(error)
}
item = nil
}
}()
if in == nil {
return nil, awserr.New("SerializationError",
"in must be a map[string]interface{} or struct, got <nil>", nil)
}
v := reflect.ValueOf(in)
if v.Kind() != reflect.Struct && !(v.Kind() == reflect.Map && v.Type().Key().Kind() == reflect.String) {
return nil, awserr.New("SerializationError",
fmt.Sprintf("in must be a map[string]interface{} or struct, got %s",
v.Type().String()),
nil)
}
if isTyped(reflect.TypeOf(in)) {
var out map[string]interface{}
in = convertToUntyped(in, out)
}
item = make(map[string]*dynamodb.AttributeValue)
for k, v := range in.(map[string]interface{}) {
item[k] = convertTo(v)
}
return item, nil
}
// ConvertFromMap accepts a map[string]*dynamodb.AttributeValue and converts it to a
// map[string]interface{} or struct.
//
// If v points to a struct, the result is first converted it to a
// map[string]interface{}, then JSON encoded/decoded it to convert to a struct,
// so `json` struct tags are respected.
//
// Deprecated: Use UnmarshalMap instead
func ConvertFromMap(item map[string]*dynamodb.AttributeValue, v interface{}) (err error) {
defer func() {
if r := recover(); r != nil {
if e, ok := r.(runtime.Error); ok {
err = e
} else if s, ok := r.(string); ok {
err = fmt.Errorf(s)
} else {
err = r.(error)
}
item = nil
}
}()
rv := reflect.ValueOf(v)
if rv.Kind() != reflect.Ptr || rv.IsNil() {
return awserr.New("SerializationError",
fmt.Sprintf("v must be a non-nil pointer to a map[string]interface{} or struct, got %s",
rv.Type()),
nil)
}
if rv.Elem().Kind() != reflect.Struct && !(rv.Elem().Kind() == reflect.Map && rv.Elem().Type().Key().Kind() == reflect.String) {
return awserr.New("SerializationError",
fmt.Sprintf("v must be a non-nil pointer to a map[string]interface{} or struct, got %s",
rv.Type()),
nil)
}
m := make(map[string]interface{})
for k, v := range item {
m[k] = convertFrom(v)
}
if isTyped(reflect.TypeOf(v)) {
err = convertToTyped(m, v)
} else {
rv.Elem().Set(reflect.ValueOf(m))
}
return err
}
// ConvertToList accepts an array or slice and converts it to a
// []*dynamodb.AttributeValue.
//
// Converting []byte fields to dynamodb.AttributeValue are only currently supported
// if the input is a map[string]interface{} type. []byte within typed structs are not
// converted correctly and are converted into base64 strings. This is a known bug,
// and will be fixed in a later release.
//
// If in contains any structs, it is first JSON encoded/decoded it to convert it
// to a []interface{}, so `json` struct tags are respected.
//
// Deprecated: Use MarshalList instead
func ConvertToList(in interface{}) (item []*dynamodb.AttributeValue, err error) {
defer func() {
if r := recover(); r != nil {
if e, ok := r.(runtime.Error); ok {
err = e
} else if s, ok := r.(string); ok {
err = fmt.Errorf(s)
} else {
err = r.(error)
}
item = nil
}
}()
if in == nil {
return nil, awserr.New("SerializationError",
"in must be an array or slice, got <nil>",
nil)
}
v := reflect.ValueOf(in)
if v.Kind() != reflect.Array && v.Kind() != reflect.Slice {
return nil, awserr.New("SerializationError",
fmt.Sprintf("in must be an array or slice, got %s",
v.Type().String()),
nil)
}
if isTyped(reflect.TypeOf(in)) {
var out []interface{}
in = convertToUntyped(in, out)
}
item = make([]*dynamodb.AttributeValue, 0, len(in.([]interface{})))
for _, v := range in.([]interface{}) {
item = append(item, convertTo(v))
}
return item, nil
}
// ConvertFromList accepts a []*dynamodb.AttributeValue and converts it to an array or
// slice.
//
// If v contains any structs, the result is first converted it to a
// []interface{}, then JSON encoded/decoded it to convert to a typed array or
// slice, so `json` struct tags are respected.
//
// Deprecated: Use UnmarshalList instead
func ConvertFromList(item []*dynamodb.AttributeValue, v interface{}) (err error) {
defer func() {
if r := recover(); r != nil {
if e, ok := r.(runtime.Error); ok {
err = e
} else if s, ok := r.(string); ok {
err = fmt.Errorf(s)
} else {
err = r.(error)
}
item = nil
}
}()
rv := reflect.ValueOf(v)
if rv.Kind() != reflect.Ptr || rv.IsNil() {
return awserr.New("SerializationError",
fmt.Sprintf("v must be a non-nil pointer to an array or slice, got %s",
rv.Type()),
nil)
}
if rv.Elem().Kind() != reflect.Array && rv.Elem().Kind() != reflect.Slice {
return awserr.New("SerializationError",
fmt.Sprintf("v must be a non-nil pointer to an array or slice, got %s",
rv.Type()),
nil)
}
l := make([]interface{}, 0, len(item))
for _, v := range item {
l = append(l, convertFrom(v))
}
if isTyped(reflect.TypeOf(v)) {
err = convertToTyped(l, v)
} else {
rv.Elem().Set(reflect.ValueOf(l))
}
return err
}
// ConvertTo accepts any interface{} and converts it to a *dynamodb.AttributeValue.
//
// If in contains any structs, it is first JSON encoded/decoded it to convert it
// to a interface{}, so `json` struct tags are respected.
//
// Deprecated: Use Marshal instead
func ConvertTo(in interface{}) (item *dynamodb.AttributeValue, err error) {
defer func() {
if r := recover(); r != nil {
if e, ok := r.(runtime.Error); ok {
err = e
} else if s, ok := r.(string); ok {
err = fmt.Errorf(s)
} else {
err = r.(error)
}
item = nil
}
}()
if in != nil && isTyped(reflect.TypeOf(in)) {
var out interface{}
in = convertToUntyped(in, out)
}
item = convertTo(in)
return item, nil
}
// ConvertFrom accepts a *dynamodb.AttributeValue and converts it to any interface{}.
//
// If v contains any structs, the result is first converted it to a interface{},
// then JSON encoded/decoded it to convert to a struct, so `json` struct tags
// are respected.
//
// Deprecated: Use Unmarshal instead
func ConvertFrom(item *dynamodb.AttributeValue, v interface{}) (err error) {
defer func() {
if r := recover(); r != nil {
if e, ok := r.(runtime.Error); ok {
err = e
} else if s, ok := r.(string); ok {
err = fmt.Errorf(s)
} else {
err = r.(error)
}
item = nil
}
}()
rv := reflect.ValueOf(v)
if rv.Kind() != reflect.Ptr || rv.IsNil() {
return awserr.New("SerializationError",
fmt.Sprintf("v must be a non-nil pointer to an interface{} or struct, got %s",
rv.Type()),
nil)
}
if rv.Elem().Kind() != reflect.Interface && rv.Elem().Kind() != reflect.Struct {
return awserr.New("SerializationError",
fmt.Sprintf("v must be a non-nil pointer to an interface{} or struct, got %s",
rv.Type()),
nil)
}
res := convertFrom(item)
if isTyped(reflect.TypeOf(v)) {
err = convertToTyped(res, v)
} else if res != nil {
rv.Elem().Set(reflect.ValueOf(res))
}
return err
}
func isTyped(v reflect.Type) bool {
switch v.Kind() {
case reflect.Struct:
return true
case reflect.Array, reflect.Slice:
if isTyped(v.Elem()) {
return true
}
case reflect.Map:
if isTyped(v.Key()) {
return true
}
if isTyped(v.Elem()) {
return true
}
case reflect.Ptr:
return isTyped(v.Elem())
}
return false
}
func convertToUntyped(in, out interface{}) interface{} {
b, err := json.Marshal(in)
if err != nil {
panic(err)
}
decoder := json.NewDecoder(bytes.NewReader(b))
decoder.UseNumber()
err = decoder.Decode(&out)
if err != nil {
panic(err)
}
return out
}
func convertToTyped(in, out interface{}) error {
b, err := json.Marshal(in)
if err != nil {
return err
}
decoder := json.NewDecoder(bytes.NewReader(b))
return decoder.Decode(&out)
}
func convertTo(in interface{}) *dynamodb.AttributeValue {
a := &dynamodb.AttributeValue{}
if in == nil {
a.NULL = new(bool)
*a.NULL = true
return a
}
if m, ok := in.(map[string]interface{}); ok {
a.M = make(map[string]*dynamodb.AttributeValue)
for k, v := range m {
a.M[k] = convertTo(v)
}
return a
}
v := reflect.ValueOf(in)
switch v.Kind() {
case reflect.Bool:
a.BOOL = new(bool)
*a.BOOL = v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
a.N = new(string)
*a.N = strconv.FormatInt(v.Int(), 10)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
a.N = new(string)
*a.N = strconv.FormatUint(v.Uint(), 10)
case reflect.Float32, reflect.Float64:
a.N = new(string)
*a.N = strconv.FormatFloat(v.Float(), 'f', -1, 64)
case reflect.String:
if n, ok := in.(json.Number); ok {
a.N = new(string)
*a.N = n.String()
} else {
a.S = new(string)
*a.S = v.String()
}
case reflect.Slice:
switch v.Type() {
case reflect.TypeOf(([]byte)(nil)):
a.B = v.Bytes()
default:
a.L = make([]*dynamodb.AttributeValue, v.Len())
for i := 0; i < v.Len(); i++ {
a.L[i] = convertTo(v.Index(i).Interface())
}
}
default:
panic(fmt.Sprintf("the type %s is not supported", v.Type().String()))
}
return a
}
func convertFrom(a *dynamodb.AttributeValue) interface{} {
if a.S != nil {
return *a.S
}
if a.N != nil {
// Number is tricky b/c we don't know which numeric type to use. Here we
// simply try the different types from most to least restrictive.
if n, err := strconv.ParseInt(*a.N, 10, 64); err == nil {
return int(n)
}
if n, err := strconv.ParseUint(*a.N, 10, 64); err == nil {
return uint(n)
}
n, err := strconv.ParseFloat(*a.N, 64)
if err != nil {
panic(err)
}
return n
}
if a.BOOL != nil {
return *a.BOOL
}
if a.NULL != nil {
return nil
}
if a.M != nil {
m := make(map[string]interface{})
for k, v := range a.M {
m[k] = convertFrom(v)
}
return m
}
if a.L != nil {
l := make([]interface{}, len(a.L))
for index, v := range a.L {
l[index] = convertFrom(v)
}
return l
}
if a.B != nil {
return a.B
}
panic(fmt.Sprintf("%#v is not a supported dynamodb.AttributeValue", a))
}