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dynamodb.go
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dynamodb.go
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/*
Copyright 2021 The Dapr Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package dynamodb
import (
"context"
"encoding/json"
"reflect"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
"github.com/dapr/components-contrib/bindings"
awsAuth "github.com/dapr/components-contrib/internal/authentication/aws"
"github.com/dapr/components-contrib/metadata"
"github.com/dapr/kit/logger"
)
// DynamoDB allows performing stateful operations on AWS DynamoDB.
type DynamoDB struct {
client *dynamodb.DynamoDB
table string
logger logger.Logger
}
type dynamoDBMetadata struct {
Region string `json:"region" mapstructure:"region"`
Endpoint string `json:"endpoint" mapstructure:"endpoint"`
AccessKey string `json:"accessKey" mapstructure:"accessKey"`
SecretKey string `json:"secretKey" mapstructure:"secretKey"`
SessionToken string `json:"sessionToken" mapstructure:"sessionToken"`
Table string `json:"table" mapstructure:"table"`
}
// NewDynamoDB returns a new DynamoDB instance.
func NewDynamoDB(logger logger.Logger) bindings.OutputBinding {
return &DynamoDB{logger: logger}
}
// Init performs connection parsing for DynamoDB.
func (d *DynamoDB) Init(_ context.Context, metadata bindings.Metadata) error {
meta, err := d.getDynamoDBMetadata(metadata)
if err != nil {
return err
}
client, err := d.getClient(meta)
if err != nil {
return err
}
d.client = client
d.table = meta.Table
return nil
}
func (d *DynamoDB) Operations() []bindings.OperationKind {
return []bindings.OperationKind{bindings.CreateOperation}
}
func (d *DynamoDB) Invoke(ctx context.Context, req *bindings.InvokeRequest) (*bindings.InvokeResponse, error) {
var obj interface{}
err := json.Unmarshal(req.Data, &obj)
if err != nil {
return nil, err
}
item, err := dynamodbattribute.MarshalMap(obj)
if err != nil {
return nil, err
}
_, err = d.client.PutItemWithContext(ctx, &dynamodb.PutItemInput{
Item: item,
TableName: aws.String(d.table),
})
if err != nil {
return nil, err
}
return nil, nil
}
func (d *DynamoDB) getDynamoDBMetadata(spec bindings.Metadata) (*dynamoDBMetadata, error) {
var meta dynamoDBMetadata
err := metadata.DecodeMetadata(spec.Properties, &meta)
if err != nil {
return nil, err
}
return &meta, nil
}
func (d *DynamoDB) getClient(metadata *dynamoDBMetadata) (*dynamodb.DynamoDB, error) {
sess, err := awsAuth.GetClient(metadata.AccessKey, metadata.SecretKey, metadata.SessionToken, metadata.Region, metadata.Endpoint)
if err != nil {
return nil, err
}
c := dynamodb.New(sess)
return c, nil
}
// GetComponentMetadata returns the metadata of the component.
func (d *DynamoDB) GetComponentMetadata() map[string]string {
metadataStruct := dynamoDBMetadata{}
metadataInfo := map[string]string{}
metadata.GetMetadataInfoFromStructType(reflect.TypeOf(metadataStruct), &metadataInfo, metadata.BindingType)
return metadataInfo
}