/
dynamolayer.go
202 lines (183 loc) · 5.29 KB
/
dynamolayer.go
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package dynamolayer
import (
"errors"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
"github.com/martin-helmich/cloudnativego-backend/src/lib/persistence"
)
const (
USERS = "users"
EVENTS = "events"
)
type DynamoDBLayer struct {
service *dynamodb.DynamoDB
}
func NewDynamoDBLayerByRegion(region string) (persistence.DatabaseHandler, error) {
sess, err := session.NewSession(&aws.Config{
Region: aws.String(region),
})
if err != nil {
return nil, err
}
return &DynamoDBLayer{
service: dynamodb.New(sess),
}, nil
}
func NewDynamoDBLayerBySession(sess *session.Session) persistence.DatabaseHandler {
return &DynamoDBLayer{
service: dynamodb.New(sess),
}
}
func (dynamoLayer *DynamoDBLayer) AddUser(user persistence.User) ([]byte, error) {
av, err := dynamodbattribute.MarshalMap(user)
if err != nil {
return nil, err
}
_, err = dynamoLayer.service.PutItem(&dynamodb.PutItemInput{
TableName: aws.String(USERS),
Item: av,
})
if err != nil {
return nil, err
}
return []byte(user.ID), nil
}
func (dynamoLayer *DynamoDBLayer) AddEvent(event persistence.Event) ([]byte, error) {
av, err := dynamodbattribute.MarshalMap(event)
if err != nil {
return nil, err
}
_, err = dynamoLayer.service.PutItem(&dynamodb.PutItemInput{
TableName: aws.String(EVENTS),
Item: av,
})
if err != nil {
return nil, err
}
return []byte(event.ID), nil
}
func (dynamoLayer *DynamoDBLayer) AddBookingForUser(id []byte, bk persistence.Booking) error {
/*
input := &dynamodb.UpdateItemInput{
ExpressionAttributeNames: map[string]*string{
}
}
av,err := dynamodbattribute.MarshalMap(bk)
*/
booking := []persistence.Booking{bk}
bookingMardhalled, err := dynamodbattribute.Marshal(&booking)
if err != nil {
return err
}
input := &dynamodb.UpdateItemInput{
UpdateExpression: aws.String("SET #B = list_append(:i, #B)"),
ExpressionAttributeNames: map[string]*string{
"#B": aws.String("Bookings"),
},
ExpressionAttributeValues: map[string]*dynamodb.AttributeValue{
":i": bookingMardhalled,
},
ReturnValues: aws.String("UPDATED_NEW"),
Key: map[string]*dynamodb.AttributeValue{
"ID": {
B: id,
},
},
TableName: aws.String("users"),
}
_, err = dynamoLayer.service.UpdateItem(input)
return err
}
func (dynamoLayer *DynamoDBLayer) FindUser(f string, l string) (persistence.User, error) {
return persistence.User{}, nil
}
func (dynamoLayer *DynamoDBLayer) FindBookingsForUser(id []byte) ([]persistence.Booking, error) {
input := &dynamodb.GetItemInput{
Key: map[string]*dynamodb.AttributeValue{
"ID": {
B: id,
},
},
TableName: aws.String("users"),
}
result, err := dynamoLayer.service.GetItem(input)
if err != nil {
return nil, err
}
av := result.Item["Bookings"]
bookings := []persistence.Booking{}
err = dynamodbattribute.Unmarshal(av, &bookings)
return bookings, err
}
func (dynamoLayer *DynamoDBLayer) FindEvent(id []byte) (persistence.Event, error) {
//create a GetItemInput object with the information we need to search for our event via it's ID attribute
input := &dynamodb.GetItemInput{
Key: map[string]*dynamodb.AttributeValue{
"ID": {
B: id,
},
},
TableName: aws.String("events"),
}
//Get the item via the GetItem method
result, err := dynamoLayer.service.GetItem(input)
if err != nil {
return persistence.Event{}, err
}
//Utilize dynamodbattribute.UnmarshalMap to unmarshal the data retrieved into an Event object
event := persistence.Event{}
err = dynamodbattribute.UnmarshalMap(result.Item, &event)
return event, err
}
func (dynamoLayer *DynamoDBLayer) FindEventByName(name string) (persistence.Event, error) {
//Create the QueryInput type with the information we need to execute the query
input := &dynamodb.QueryInput{
KeyConditionExpression: aws.String("EventName = :n"),
ExpressionAttributeValues: map[string]*dynamodb.AttributeValue{
":n": {
S: aws.String(name),
},
},
IndexName: aws.String("EventName-index"),
TableName: aws.String("events"),
}
// Execute the query
result, err := dynamoLayer.service.Query(input)
if err != nil {
return persistence.Event{}, err
}
//Obtain the first item from the result
event := persistence.Event{}
if len(result.Items) > 0 {
err = dynamodbattribute.UnmarshalMap(result.Items[0], &event)
} else {
err = errors.New("No results found")
}
return event, err
}
func (dynamoLayer *DynamoDBLayer) FindAllAvailableEvents() ([]persistence.Event, error) {
// Create the ScanInput object with the table name
input := &dynamodb.ScanInput{
TableName: aws.String("events"),
}
// Perform the scan operation
result, err := dynamoLayer.service.Scan(input)
if err != nil {
return nil, err
}
// Obtain the results via the unmarshalListofMaps funciton
events := []persistence.Event{}
err = dynamodbattribute.UnmarshalListOfMaps(result.Items, &events)
return events, err
}
func (dynamoLayer *DynamoDBLayer) AddLocation(l persistence.Location) (persistence.Location, error) {
return persistence.Location{}, nil
}
func (dynamoLayer *DynamoDBLayer) FindLocation(s string) (persistence.Location, error) {
return persistence.Location{}, nil
}
func (dynamoLayer *DynamoDBLayer) FindAllLocations() ([]persistence.Location, error) {
return nil, nil
}