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controllers.go
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controllers.go
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package main
import (
"encoding/json"
"fmt"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbiface"
guuid "github.com/google/uuid"
"time"
)
type LambdaRequest struct {
Data string `json:"data"`
}
func CreateMessage(request events.APIGatewayWebsocketProxyRequest) (events.APIGatewayProxyResponse, error) {
lambdaRequest := LambdaRequest{}
json.Unmarshal([]byte(request.Body), &lambdaRequest)
message := buildMessage(lambdaRequest.Data)
_, err := SaveMessage(dbSession(), message)
if err != nil {
returnFormattedError(err)
}
body, err := json.Marshal(message)
if err != nil {
returnFormattedError(err)
}
return events.APIGatewayProxyResponse{Body: string(body), StatusCode: 201}, nil
}
func dbSession() (dbSession dynamodbiface.DynamoDBAPI) {
sess := session.Must(session.NewSession())
return dynamodb.New(sess)
}
func returnFormattedError(err error) (events.APIGatewayProxyResponse, error) {
return events.APIGatewayProxyResponse{Body: err.Error(), StatusCode: 422}, nil
}
func buildMessage(data string) (message Message) {
return Message{
PrimaryKey: fmt.Sprintf("MESSAGE_%s", guuid.New().String()),
SecondaryKey: fmt.Sprintf("CHAT_%s", "42"),
CreatedAt: time.Now().Format(time.RFC3339),
Data: data,
}
}