mirror of
https://github.com/Luzifer/cloudkeys-go.git
synced 2024-11-10 07:00:08 +00:00
95 lines
3.6 KiB
Go
95 lines
3.6 KiB
Go
// Package dynamodbattribute provides marshaling and unmarshaling utilities to
|
|
// convert between Go types and dynamodb.AttributeValues.
|
|
//
|
|
// These utilities allow you to marshal slices, maps, structs, and scalar values
|
|
// to and from dynamodb.AttributeValue. These are useful when marshaling
|
|
// Go value tyes to dynamodb.AttributeValue for DynamoDB requests, or
|
|
// unmarshaling the dynamodb.AttributeValue back into a Go value type.
|
|
//
|
|
// AttributeValue Marshaling
|
|
//
|
|
// To marshal a Go type to a dynamodbAttributeValue you can use the Marshal
|
|
// functions in the dynamodbattribute package. There are specialized versions
|
|
// of these functions for collections of Attributevalue, such as maps and lists.
|
|
//
|
|
// The following example uses MarshalMap to convert the Record Go type to a
|
|
// dynamodb.AttributeValue type and use the value to make a PutItem API request.
|
|
//
|
|
// type Record struct {
|
|
// ID string
|
|
// URLs []string
|
|
// }
|
|
//
|
|
// //...
|
|
//
|
|
// r := Record{
|
|
// ID: "ABC123",
|
|
// URLs: []string{
|
|
// "https://example.com/first/link",
|
|
// "https://example.com/second/url",
|
|
// },
|
|
// }
|
|
// av, err := dynamodbattribute.MarshalMap(r)
|
|
// if err != nil {
|
|
// panic(fmt.Sprintf("failed to DynamoDB marshal Record, %v", err))
|
|
// }
|
|
//
|
|
// _, err = svc.PutItem(&dynamodb.PutItemInput{
|
|
// TableName: aws.String(myTableName),
|
|
// Item: av,
|
|
// })
|
|
// if err != nil {
|
|
// panic(fmt.Sprintf("failed to put Record to DynamoDB, %v", err))
|
|
// }
|
|
//
|
|
// AttributeValue Unmarshaling
|
|
//
|
|
// To unmarshal a dynamodb.AttributeValue to a Go type you can use the Unmarshal
|
|
// functions in the dynamodbattribute package. There are specialized versions
|
|
// of these functions for collections of Attributevalue, such as maps and lists.
|
|
//
|
|
// The following example will unmarshal the DynamoDB's Scan API operation. The
|
|
// Items returned by the operation will be unmarshaled into the slice of Records
|
|
// Go type.
|
|
//
|
|
// type Record struct {
|
|
// ID string
|
|
// URLs []string
|
|
// }
|
|
//
|
|
// //...
|
|
//
|
|
// var records []Record
|
|
//
|
|
// // Use the ScanPages method to perform the scan with pagination. Use
|
|
// // just Scan method to make the API call without pagination.
|
|
// err := svc.ScanPages(&dynamodb.ScanInput{
|
|
// TableName: aws.String(myTableName),
|
|
// }, func(page *dynamodb.ScanOutput, last bool) bool {
|
|
// recs := []Record{}
|
|
//
|
|
// err := dynamodbattribute.UnmarshalListOfMaps(page.Items, &recs)
|
|
// if err != nil {
|
|
// panic(fmt.Sprintf("failed to unmarshal Dynamodb Scan Items, %v", err))
|
|
// }
|
|
//
|
|
// records = append(records, recs...)
|
|
//
|
|
// return true // keep paging
|
|
// })
|
|
//
|
|
// The ConvertTo, ConvertToList, ConvertToMap, ConvertFrom, ConvertFromMap
|
|
// and ConvertFromList methods have been deprecated. The Marshal and Unmarshal
|
|
// functions should be used instead. The ConvertTo|From marshallers do not
|
|
// support BinarySet, NumberSet, nor StringSets, and will incorrect marshal
|
|
// binary data fields in structs as base64 strings.
|
|
//
|
|
// The Marshal and Unmarshal functions correct this behavior, and removes
|
|
// the reliance on encoding.json. `json` struct tags are still supported. In
|
|
// addition support for a new struct tag `dynamodbav` was added. Support for
|
|
// the json.Marshaler and json.Unmarshaler interfaces have been removed and
|
|
// replaced with have been replaced with dynamodbattribute.Marshaler and
|
|
// dynamodbattribute.Unmarshaler interfaces.
|
|
//
|
|
// `time.Time` is marshaled as RFC3339 format.
|
|
package dynamodbattribute
|