/
store.go
165 lines (134 loc) · 5.45 KB
/
store.go
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package dynamodbstore
import (
"context"
"errors"
"fmt"
"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/SKF/go-eventsource/v2/eventsource"
"github.com/SKF/go-utility/v2/log"
)
type store struct {
db *dynamodb.DynamoDB
tableName string
consistentRead bool
}
// New creates a new event source store
func New(db *dynamodb.DynamoDB, tableName string) eventsource.Store {
return &store{
db: db,
tableName: tableName,
consistentRead: true,
}
}
// LoadByAggregate ...
func (store *store) LoadByAggregate(ctx context.Context, aggregateID string, opts ...eventsource.QueryOption) (records []eventsource.Record, err error) {
records = []eventsource.Record{}
key := map[string]*dynamodb.AttributeValue{
":id": {S: &aggregateID},
}
input := dynamodb.QueryInput{
TableName: &store.tableName,
KeyConditionExpression: aws.String("aggregateId = :id"),
ExpressionAttributeValues: key,
ConsistentRead: &store.consistentRead,
}
queryOpts := evaluateQueryOptions(opts)
addTimestampToQuery(&input, queryOpts.timestamp)
addFilteringOnQuery(&input, queryOpts.filterOptions)
var resultItems []map[string]*dynamodb.AttributeValue
if err = store.db.QueryPagesWithContext(ctx, &input,
func(result *dynamodb.QueryOutput, lastPage bool) bool {
resultItems = append(resultItems, result.Items...)
return !lastPage
},
); err != nil {
err = fmt.Errorf("couldn't scan pages (input=%+v): %w", input, err)
return
}
err = dynamodbattribute.UnmarshalListOfMaps(resultItems, &records)
if err != nil {
err = fmt.Errorf("couldn't unmarshal list of maps: %w", err)
return
}
return records, err
}
// Load will load records based on specified query options
func (store *store) Load(ctx context.Context, opts ...eventsource.QueryOption) (records []eventsource.Record, err error) {
records = []eventsource.Record{}
queryOpts := evaluateQueryOptions(opts)
scanInput := dynamodb.ScanInput{
Limit: queryOpts.limit,
IndexName: queryOpts.index,
TableName: &store.tableName,
ConsistentRead: &store.consistentRead,
}
addTimestampOnScan(&scanInput, queryOpts.timestamp)
addFilteringOnScan(&scanInput, queryOpts.filterOptions)
scanItems := make([]map[string]*dynamodb.AttributeValue, 0)
err = store.db.ScanPagesWithContext(ctx, &scanInput, func(output *dynamodb.ScanOutput, lastPage bool) bool {
scanItems = append(scanItems, output.Items...)
return !lastPage
})
if err != nil {
err = fmt.Errorf("couldn't scan pages (input=%+v): %w", scanInput, err)
return
}
err = dynamodbattribute.UnmarshalListOfMaps(scanItems, &records)
if err != nil {
err = fmt.Errorf("couldn't unmarshal list of maps: %w", err)
return
}
return records, err
}
func (store *store) LoadBySequenceID(_ context.Context, _ string, _ ...eventsource.QueryOption) (records []eventsource.Record, err error) {
err = errors.New("operation not supported on DynamoDB")
return
}
func (store *store) LoadBySequenceIDAndType(_ context.Context, _ string, _ string, _ ...eventsource.QueryOption) (records []eventsource.Record, err error) {
err = errors.New("operation not supported on DynamoDB")
return
}
func (store *store) LoadByTimestamp(_ context.Context, _ int64, _ ...eventsource.QueryOption) (records []eventsource.Record, err error) {
err = errors.New("operation not supported on DynamoDB")
return
}
func addFilteringOnScan(scanInput *dynamodb.ScanInput, filterOption *filterOpt) {
if filterOption != nil {
if filterOption.getDynamoAttributeValue() == nil {
log.Warnf("Unable to add filtering on unimplmented data type: %s", filterOption.attributeType)
return
}
scanInput.FilterExpression = filterOption.mapFilterExpression(scanInput.FilterExpression)
scanInput.ExpressionAttributeValues = filterOption.mapExpressionAttributeValues(scanInput.ExpressionAttributeValues)
scanInput.ExpressionAttributeNames = filterOption.mapExpressionAttributeNames(scanInput.ExpressionAttributeNames)
}
}
func addFilteringOnQuery(queryInput *dynamodb.QueryInput, filterOption *filterOpt) {
if filterOption != nil {
if filterOption.getDynamoAttributeValue() == nil {
log.Warnf("Unable to add filtering on unimplmented data type: %s", filterOption.attributeType)
return
}
queryInput.FilterExpression = filterOption.mapFilterExpression(queryInput.FilterExpression)
queryInput.ExpressionAttributeValues = filterOption.mapExpressionAttributeValues(queryInput.ExpressionAttributeValues)
queryInput.ExpressionAttributeNames = filterOption.mapExpressionAttributeNames(queryInput.ExpressionAttributeNames)
}
}
func addTimestampOnScan(scanInput *dynamodb.ScanInput, timestamp *string) {
if timestamp != nil {
exprWithTs, values, names := mapTimestampToDynamoExpr(scanInput.FilterExpression, scanInput.ExpressionAttributeValues, scanInput.ExpressionAttributeNames, timestamp)
scanInput.FilterExpression = &exprWithTs
scanInput.ExpressionAttributeValues = values
scanInput.ExpressionAttributeNames = names
}
}
func addTimestampToQuery(queryInput *dynamodb.QueryInput, timestamp *string) {
if timestamp != nil {
exprWithTs, values, names := mapTimestampToDynamoExpr(queryInput.KeyConditionExpression, queryInput.ExpressionAttributeValues, queryInput.ExpressionAttributeNames, timestamp)
queryInput.KeyConditionExpression = &exprWithTs
queryInput.ExpressionAttributeValues = values
queryInput.ExpressionAttributeNames = names
}
}