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builder_getitem.go
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builder_getitem.go
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package ddb
import (
"fmt"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
"github.com/hashicorp/go-multierror"
"github.com/justtrackio/gosoline/pkg/clock"
)
//go:generate mockery --name GetItemBuilder
type GetItemBuilder interface {
WithHash(hashValue interface{}) GetItemBuilder
WithRange(rangeValue interface{}) GetItemBuilder
WithKeys(keys ...interface{}) GetItemBuilder
DisableTtlFilter() GetItemBuilder
WithProjection(rangeValue interface{}) GetItemBuilder
WithConsistentRead(consistentRead bool) GetItemBuilder
Build(result interface{}) (*dynamodb.GetItemInput, error)
}
type getItemBuilder struct {
filterBuilder
err error
keyBuilder keyBuilder
consistentRead *bool
projection interface{}
}
func NewGetItemBuilder(metadata *Metadata, clock clock.Clock) GetItemBuilder {
return &getItemBuilder{
filterBuilder: newFilterBuilder(metadata, clock),
keyBuilder: keyBuilder{
metadata: metadata.Main,
},
}
}
func (b *getItemBuilder) WithHash(hashValue interface{}) GetItemBuilder {
b.keyBuilder.withHash(hashValue)
return b
}
func (b *getItemBuilder) WithRange(rangeValue interface{}) GetItemBuilder {
b.keyBuilder.withRange(rangeValue)
return b
}
func (b *getItemBuilder) WithKeys(keys ...interface{}) GetItemBuilder {
if len(keys) == 0 {
return b
}
b.WithHash(keys[0])
if len(keys) > 2 {
b.err = multierror.Append(b.err, fmt.Errorf("more than two keys provided for WithKeys"))
return b
}
b.WithRange(keys[1])
return b
}
func (b *getItemBuilder) DisableTtlFilter() GetItemBuilder {
b.disableTtlFilter = true
return b
}
func (b *getItemBuilder) WithProjection(projection interface{}) GetItemBuilder {
b.projection = projection
return b
}
func (b *getItemBuilder) WithConsistentRead(consistentRead bool) GetItemBuilder {
b.consistentRead = &consistentRead
return b
}
func (b *getItemBuilder) Build(result interface{}) (*dynamodb.GetItemInput, error) {
if b.err != nil {
return nil, b.err
}
if b.projection == nil {
b.projection = result
}
keys, err := b.keyBuilder.buildKey(result)
if err != nil {
return nil, err
}
expr, err := b.buildExpression()
if err != nil {
return nil, err
}
input := &dynamodb.GetItemInput{
TableName: aws.String(b.metadata.TableName),
Key: keys,
ConsistentRead: b.consistentRead,
ExpressionAttributeNames: expr.Names(),
ProjectionExpression: expr.Projection(),
ReturnConsumedCapacity: types.ReturnConsumedCapacityIndexes,
}
return input, nil
}
func (b *getItemBuilder) buildExpression() (expression.Expression, error) {
projection, err := buildProjectionExpression(b.metadata.Main, b.projection)
if err != nil {
return expression.Expression{}, err
}
if projection == nil {
return expression.Expression{}, nil
}
return expression.NewBuilder().WithProjection(*projection).Build()
}