thingwithcompositeenumattributes.go

package dynamodb

import (
	"context"
	"fmt"
	"strings"

	"github.com/Clever/wag/samples/v8/gen-go-db/models"
	"github.com/Clever/wag/samples/v8/gen-go-db/server/db"
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/service/dynamodb"
	"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
	"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbiface"
	"github.com/go-openapi/strfmt"
)

var _ = strfmt.DateTime{}

// ThingWithCompositeEnumAttributesTable represents the user-configurable properties of the ThingWithCompositeEnumAttributes table.
type ThingWithCompositeEnumAttributesTable struct {
	DynamoDBAPI        dynamodbiface.DynamoDBAPI
	Prefix             string
	TableName          string
	ReadCapacityUnits  int64
	WriteCapacityUnits int64
}

// ddbThingWithCompositeEnumAttributesPrimaryKey represents the primary key of a ThingWithCompositeEnumAttributes in DynamoDB.
type ddbThingWithCompositeEnumAttributesPrimaryKey struct {
	NameBranch string          `dynamodbav:"name_branch"`
	Date       strfmt.DateTime `dynamodbav:"date"`
}

// ddbThingWithCompositeEnumAttributes represents a ThingWithCompositeEnumAttributes as stored in DynamoDB.
type ddbThingWithCompositeEnumAttributes struct {
	models.ThingWithCompositeEnumAttributes
}

func (t ThingWithCompositeEnumAttributesTable) name() string {
	if t.TableName != "" {
		return t.TableName
	}
	return fmt.Sprintf("%s-thing-with-composite-enum-attributess", t.Prefix)
}

func (t ThingWithCompositeEnumAttributesTable) create(ctx context.Context) error {
	if _, err := t.DynamoDBAPI.CreateTableWithContext(ctx, &dynamodb.CreateTableInput{
		AttributeDefinitions: []*dynamodb.AttributeDefinition{
			{
				AttributeName: aws.String("date"),
				AttributeType: aws.String("S"),
			},
			{
				AttributeName: aws.String("name_branch"),
				AttributeType: aws.String("S"),
			},
		},
		KeySchema: []*dynamodb.KeySchemaElement{
			{
				AttributeName: aws.String("name_branch"),
				KeyType:       aws.String(dynamodb.KeyTypeHash),
			},
			{
				AttributeName: aws.String("date"),
				KeyType:       aws.String(dynamodb.KeyTypeRange),
			},
		},
		ProvisionedThroughput: &dynamodb.ProvisionedThroughput{
			ReadCapacityUnits:  aws.Int64(t.ReadCapacityUnits),
			WriteCapacityUnits: aws.Int64(t.WriteCapacityUnits),
		},
		TableName: aws.String(t.name()),
	}); err != nil {
		return err
	}
	return nil
}

func (t ThingWithCompositeEnumAttributesTable) saveThingWithCompositeEnumAttributes(ctx context.Context, m models.ThingWithCompositeEnumAttributes) error {
	data, err := encodeThingWithCompositeEnumAttributes(m)
	if err != nil {
		return err
	}
	_, err = t.DynamoDBAPI.PutItemWithContext(ctx, &dynamodb.PutItemInput{
		TableName: aws.String(t.name()),
		Item:      data,
		ExpressionAttributeNames: map[string]*string{
			"#NAME_BRANCH": aws.String("name_branch"),
			"#DATE":        aws.String("date"),
		},
		ConditionExpression: aws.String("attribute_not_exists(#NAME_BRANCH) AND attribute_not_exists(#DATE)"),
	})
	if err != nil {
		if aerr, ok := err.(awserr.Error); ok {
			switch aerr.Code() {
			case dynamodb.ErrCodeConditionalCheckFailedException:
				return db.ErrThingWithCompositeEnumAttributesAlreadyExists{
					NameBranch: fmt.Sprintf("%s@%s", *m.Name, m.BranchID),
					Date:       *m.Date,
				}
			case dynamodb.ErrCodeResourceNotFoundException:
				return fmt.Errorf("table or index not found: %s", t.name())
			}
		}
		return err
	}
	return nil
}

func (t ThingWithCompositeEnumAttributesTable) getThingWithCompositeEnumAttributes(ctx context.Context, name string, branchID models.Branch, date strfmt.DateTime) (*models.ThingWithCompositeEnumAttributes, error) {
	key, err := dynamodbattribute.MarshalMap(ddbThingWithCompositeEnumAttributesPrimaryKey{
		NameBranch: fmt.Sprintf("%s@%s", name, branchID),
		Date:       date,
	})
	if err != nil {
		return nil, err
	}
	res, err := t.DynamoDBAPI.GetItemWithContext(ctx, &dynamodb.GetItemInput{
		Key:            key,
		TableName:      aws.String(t.name()),
		ConsistentRead: aws.Bool(true),
	})
	if err != nil {
		if aerr, ok := err.(awserr.Error); ok {
			switch aerr.Code() {
			case dynamodb.ErrCodeResourceNotFoundException:
				return nil, fmt.Errorf("table or index not found: %s", t.name())
			}
		}
		return nil, err
	}

	if len(res.Item) == 0 {
		return nil, db.ErrThingWithCompositeEnumAttributesNotFound{
			Name:     name,
			BranchID: branchID,
			Date:     date,
		}
	}

	var m models.ThingWithCompositeEnumAttributes
	if err := decodeThingWithCompositeEnumAttributes(res.Item, &m); err != nil {
		return nil, err
	}

	return &m, nil
}

func (t ThingWithCompositeEnumAttributesTable) scanThingWithCompositeEnumAttributess(ctx context.Context, input db.ScanThingWithCompositeEnumAttributessInput, fn func(m *models.ThingWithCompositeEnumAttributes, lastThingWithCompositeEnumAttributes bool) bool) error {
	scanInput := &dynamodb.ScanInput{
		TableName:      aws.String(t.name()),
		ConsistentRead: aws.Bool(!input.DisableConsistentRead),
		Limit:          input.Limit,
	}
	if input.StartingAfter != nil {
		exclusiveStartKey, err := dynamodbattribute.MarshalMap(input.StartingAfter)
		if err != nil {
			return fmt.Errorf("error encoding exclusive start key for scan: %s", err.Error())
		}
		// must provide only the fields constituting the index
		scanInput.ExclusiveStartKey = map[string]*dynamodb.AttributeValue{
			"name_branch": &dynamodb.AttributeValue{
				S: aws.String(fmt.Sprintf("%s@%s", *input.StartingAfter.Name, input.StartingAfter.BranchID)),
			},
			"date": exclusiveStartKey["date"],
		}
	}
	totalRecordsProcessed := int64(0)
	var innerErr error
	err := t.DynamoDBAPI.ScanPagesWithContext(ctx, scanInput, func(out *dynamodb.ScanOutput, lastPage bool) bool {
		items, err := decodeThingWithCompositeEnumAttributess(out.Items)
		if err != nil {
			innerErr = fmt.Errorf("error decoding %s", err.Error())
			return false
		}
		for i := range items {
			if input.Limiter != nil {
				if err := input.Limiter.Wait(ctx); err != nil {
					innerErr = err
					return false
				}
			}
			isLastModel := lastPage && i == len(items)-1
			if shouldContinue := fn(&items[i], isLastModel); !shouldContinue {
				return false
			}
			totalRecordsProcessed++
			// if the Limit of records have been passed to fn, don't pass anymore records.
			if input.Limit != nil && totalRecordsProcessed == *input.Limit {
				return false
			}
		}
		return true
	})
	if innerErr != nil {
		return innerErr
	}
	return err
}

func (t ThingWithCompositeEnumAttributesTable) getThingWithCompositeEnumAttributessByNameBranchAndDate(ctx context.Context, input db.GetThingWithCompositeEnumAttributessByNameBranchAndDateInput, fn func(m *models.ThingWithCompositeEnumAttributes, lastThingWithCompositeEnumAttributes bool) bool) error {
	if input.DateStartingAt != nil && input.StartingAfter != nil {
		return fmt.Errorf("Can specify only one of input.DateStartingAt or input.StartingAfter")
	}
	if input.Name == "" {
		return fmt.Errorf("Hash key input.Name cannot be empty")
	}
	if input.BranchID == "" {
		return fmt.Errorf("Hash key input.BranchID cannot be empty")
	}
	queryInput := &dynamodb.QueryInput{
		TableName: aws.String(t.name()),
		ExpressionAttributeNames: map[string]*string{
			"#NAME_BRANCH": aws.String("name_branch"),
		},
		ExpressionAttributeValues: map[string]*dynamodb.AttributeValue{
			":nameBranch": &dynamodb.AttributeValue{
				S: aws.String(fmt.Sprintf("%s@%s", input.Name, input.BranchID)),
			},
		},
		ScanIndexForward: aws.Bool(!input.Descending),
		ConsistentRead:   aws.Bool(!input.DisableConsistentRead),
	}
	if input.Limit != nil {
		queryInput.Limit = input.Limit
	}
	if input.DateStartingAt == nil {
		queryInput.KeyConditionExpression = aws.String("#NAME_BRANCH = :nameBranch")
	} else {
		queryInput.ExpressionAttributeNames["#DATE"] = aws.String("date")
		queryInput.ExpressionAttributeValues[":date"] = &dynamodb.AttributeValue{
			S: aws.String(toDynamoTimeString(*input.DateStartingAt)),
		}
		if input.Descending {
			queryInput.KeyConditionExpression = aws.String("#NAME_BRANCH = :nameBranch AND #DATE <= :date")
		} else {
			queryInput.KeyConditionExpression = aws.String("#NAME_BRANCH = :nameBranch AND #DATE >= :date")
		}
	}
	if input.StartingAfter != nil {
		queryInput.ExclusiveStartKey = map[string]*dynamodb.AttributeValue{
			"date": &dynamodb.AttributeValue{
				S: aws.String(toDynamoTimeStringPtr(input.StartingAfter.Date)),
			},
			"name_branch": &dynamodb.AttributeValue{
				S: aws.String(fmt.Sprintf("%s@%s", *input.StartingAfter.Name, input.StartingAfter.BranchID)),
			},
		}
	}

	totalRecordsProcessed := int64(0)
	var pageFnErr error
	pageFn := func(queryOutput *dynamodb.QueryOutput, lastPage bool) bool {
		if len(queryOutput.Items) == 0 {
			return false
		}
		items, err := decodeThingWithCompositeEnumAttributess(queryOutput.Items)
		if err != nil {
			pageFnErr = err
			return false
		}
		hasMore := true
		for i := range items {
			if lastPage == true {
				hasMore = i < len(items)-1
			}
			if !fn(&items[i], !hasMore) {
				return false
			}
			totalRecordsProcessed++
			// if the Limit of records have been passed to fn, don't pass anymore records.
			if input.Limit != nil && totalRecordsProcessed == *input.Limit {
				return false
			}
		}
		return true
	}

	err := t.DynamoDBAPI.QueryPagesWithContext(ctx, queryInput, pageFn)
	if err != nil {
		if aerr, ok := err.(awserr.Error); ok {
			switch aerr.Code() {
			case dynamodb.ErrCodeResourceNotFoundException:
				return fmt.Errorf("table or index not found: %s", t.name())
			}
		}
		return err
	}
	if pageFnErr != nil {
		return pageFnErr
	}

	return nil
}

func (t ThingWithCompositeEnumAttributesTable) deleteThingWithCompositeEnumAttributes(ctx context.Context, name string, branchID models.Branch, date strfmt.DateTime) error {
	key, err := dynamodbattribute.MarshalMap(ddbThingWithCompositeEnumAttributesPrimaryKey{
		NameBranch: fmt.Sprintf("%s@%s", name, branchID),
		Date:       date,
	})
	if err != nil {
		return err
	}
	_, err = t.DynamoDBAPI.DeleteItemWithContext(ctx, &dynamodb.DeleteItemInput{
		Key:       key,
		TableName: aws.String(t.name()),
	})
	if err != nil {
		if aerr, ok := err.(awserr.Error); ok {
			switch aerr.Code() {
			case dynamodb.ErrCodeResourceNotFoundException:
				return fmt.Errorf("table or index not found: %s", t.name())
			}
		}
		return err
	}

	return nil
}

// encodeThingWithCompositeEnumAttributes encodes a ThingWithCompositeEnumAttributes as a DynamoDB map of attribute values.
func encodeThingWithCompositeEnumAttributes(m models.ThingWithCompositeEnumAttributes) (map[string]*dynamodb.AttributeValue, error) {
	val, err := dynamodbattribute.MarshalMap(ddbThingWithCompositeEnumAttributes{
		ThingWithCompositeEnumAttributes: m,
	})
	if err != nil {
		return nil, err
	}
	// make sure composite attributes don't contain separator characters
	if strings.Contains(*m.Name, "@") {
		return nil, fmt.Errorf("name cannot contain '@': %s", *m.Name)
	}
	// add in composite attributes
	primaryKey, err := dynamodbattribute.MarshalMap(ddbThingWithCompositeEnumAttributesPrimaryKey{
		NameBranch: fmt.Sprintf("%s@%s", *m.Name, m.BranchID),
		Date:       *m.Date,
	})
	if err != nil {
		return nil, err
	}
	for k, v := range primaryKey {
		val[k] = v
	}
	return val, err
}

// decodeThingWithCompositeEnumAttributes translates a ThingWithCompositeEnumAttributes stored in DynamoDB to a ThingWithCompositeEnumAttributes struct.
func decodeThingWithCompositeEnumAttributes(m map[string]*dynamodb.AttributeValue, out *models.ThingWithCompositeEnumAttributes) error {
	var ddbThingWithCompositeEnumAttributes ddbThingWithCompositeEnumAttributes
	if err := dynamodbattribute.UnmarshalMap(m, &ddbThingWithCompositeEnumAttributes); err != nil {
		return err
	}
	*out = ddbThingWithCompositeEnumAttributes.ThingWithCompositeEnumAttributes
	return nil
}

// decodeThingWithCompositeEnumAttributess translates a list of ThingWithCompositeEnumAttributess stored in DynamoDB to a slice of ThingWithCompositeEnumAttributes structs.
func decodeThingWithCompositeEnumAttributess(ms []map[string]*dynamodb.AttributeValue) ([]models.ThingWithCompositeEnumAttributes, error) {
	thingWithCompositeEnumAttributess := make([]models.ThingWithCompositeEnumAttributes, len(ms))
	for i, m := range ms {
		var thingWithCompositeEnumAttributes models.ThingWithCompositeEnumAttributes
		if err := decodeThingWithCompositeEnumAttributes(m, &thingWithCompositeEnumAttributes); err != nil {
			return nil, err
		}
		thingWithCompositeEnumAttributess[i] = thingWithCompositeEnumAttributes
	}
	return thingWithCompositeEnumAttributess, nil
}