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attr.go
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attr.go
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package dynamo
import (
"fmt"
"strconv"
"github.com/aws/aws-sdk-go/service/dynamodb"
)
// Item is a type alias for the raw DynamoDB item type.
type Item = map[string]*dynamodb.AttributeValue
type shapeKey byte
func (sk shapeKey) String() string { return string(rune(sk)) }
func (sk shapeKey) GoString() string { return fmt.Sprintf("shape(%s)", sk.String()) }
const (
shapeB shapeKey = 'B'
shapeBOOL shapeKey = 'T'
shapeN shapeKey = 'N'
shapeS shapeKey = 'S'
shapeL shapeKey = 'L'
shapeM shapeKey = 'M'
shapeBS shapeKey = 'b'
shapeNS shapeKey = 'n'
shapeSS shapeKey = 's'
shapeNULL shapeKey = '0'
shapeAny shapeKey = '_'
shapeInvalid shapeKey = 0
)
func shapeOf(av *dynamodb.AttributeValue) shapeKey {
if av == nil {
return shapeInvalid
}
switch {
case av.B != nil:
return shapeB
case av.BS != nil:
return shapeBS
case av.BOOL != nil:
return shapeBOOL
case av.N != nil:
return shapeN
case av.S != nil:
return shapeS
case av.L != nil:
return shapeL
case av.NS != nil:
return shapeNS
case av.SS != nil:
return shapeSS
case av.M != nil:
return shapeM
case av.NULL != nil:
return shapeNULL
}
return shapeAny
}
// av2iface converts an av into interface{}.
func av2iface(av *dynamodb.AttributeValue) (interface{}, error) {
switch {
case av.B != nil:
return av.B, nil
case av.BS != nil:
return av.BS, nil
case av.BOOL != nil:
return *av.BOOL, nil
case av.N != nil:
return strconv.ParseFloat(*av.N, 64)
case av.S != nil:
return *av.S, nil
case av.L != nil:
list := make([]interface{}, 0, len(av.L))
for _, item := range av.L {
iface, err := av2iface(item)
if err != nil {
return nil, err
}
list = append(list, iface)
}
return list, nil
case av.NS != nil:
set := make([]float64, 0, len(av.NS))
for _, n := range av.NS {
f, err := strconv.ParseFloat(*n, 64)
if err != nil {
return nil, err
}
set = append(set, f)
}
return set, nil
case av.SS != nil:
set := make([]string, 0, len(av.SS))
for _, s := range av.SS {
set = append(set, *s)
}
return set, nil
case av.M != nil:
m := make(map[string]interface{}, len(av.M))
for k, v := range av.M {
iface, err := av2iface(v)
if err != nil {
return nil, err
}
m[k] = iface
}
return m, nil
case av.NULL != nil:
return nil, nil
}
return nil, fmt.Errorf("dynamo: unsupported AV: %#v", *av)
}
func avTypeName(av *dynamodb.AttributeValue) string {
if av == nil {
return "<nil>"
}
switch {
case av.B != nil:
return "binary"
case av.BS != nil:
return "binary set"
case av.BOOL != nil:
return "boolean"
case av.N != nil:
return "number"
case av.S != nil:
return "string"
case av.L != nil:
return "list"
case av.NS != nil:
return "number set"
case av.SS != nil:
return "string set"
case av.M != nil:
return "map"
case av.NULL != nil:
return "null"
}
return "<empty>"
}