/
main.go
83 lines (73 loc) · 2.19 KB
/
main.go
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package main
import (
"encoding/json"
"net/http"
"os"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-lambda-go/lambda"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/aws/external"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/expression"
)
type Movie struct {
ID string `json:"id"`
Name string `json:"name"`
}
func filter(category string) (events.APIGatewayProxyResponse, error) {
cfg, err := external.LoadDefaultAWSConfig()
if err != nil {
return events.APIGatewayProxyResponse{
StatusCode: http.StatusInternalServerError,
Body: "Error while retrieving AWS credentials",
}, nil
}
filter := expression.Name("category").Equal(expression.Value(category))
projection := expression.NamesList(expression.Name("id"), expression.Name("name"), expression.Name("description"))
expr, err := expression.NewBuilder().WithFilter(filter).WithProjection(projection).Build()
if err != nil {
return events.APIGatewayProxyResponse{
StatusCode: http.StatusInternalServerError,
Body: "Error while building DynamoDB expression",
}, nil
}
svc := dynamodb.New(cfg)
req := svc.ScanRequest(&dynamodb.ScanInput{
TableName: aws.String(os.Getenv("TABLE_NAME")),
ExpressionAttributeNames: expr.Names(),
ExpressionAttributeValues: expr.Values(),
FilterExpression: expr.Filter(),
ProjectionExpression: expr.Projection(),
})
res, err := req.Send()
if err != nil {
return events.APIGatewayProxyResponse{
StatusCode: http.StatusInternalServerError,
Body: "Error while scanning DynamoDB",
}, nil
}
movies := make([]Movie, 0)
for _, item := range res.Items {
movies = append(movies, Movie{
ID: *item["ID"].S,
Name: *item["Name"].S,
})
}
response, err := json.Marshal(movies)
if err != nil {
return events.APIGatewayProxyResponse{
StatusCode: http.StatusInternalServerError,
Body: "Error while decoding to string value",
}, nil
}
return events.APIGatewayProxyResponse{
StatusCode: 200,
Headers: map[string]string{
"Content-Type": "application/json",
},
Body: string(response),
}, nil
}
func main() {
lambda.Start(filter)
}