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main.go
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main.go
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package main
import (
"encoding/json"
"errors"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-lambda-go/lambda"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
serviceLambda "github.com/aws/aws-sdk-go/service/lambda"
"log"
"os"
)
func proxy(request events.APIGatewayProxyRequest) (response events.APIGatewayProxyResponse, err error) {
result, err := serviceLambda.New(getNewSession()).Invoke(createLambdaInvokeInput(getRequestBytes(request)))
if err != nil {
log.Printf("Cannot proxy request %+v. Error: %+v.", request, err)
return events.APIGatewayProxyResponse{}, errors.New(err.Error())
}
return events.APIGatewayProxyResponse{
StatusCode: int(*result.StatusCode),
Body: string(result.Payload),
}, nil
}
func getRequestBytes(request events.APIGatewayProxyRequest) []byte {
bytes, err := json.Marshal(request)
if err != nil {
log.Panicf("Cannot obtain bytes from request %+v", request)
}
return bytes
}
func getNewSession() *session.Session {
region := os.Getenv("region")
sess, err := session.NewSession(&aws.Config{
Region: aws.String(region)},
)
if err != nil {
log.Panicf("Cannot create new session with region %v", region)
}
return sess
}
func createLambdaInvokeInput(bytes []byte) *serviceLambda.InvokeInput {
input := &serviceLambda.InvokeInput{
FunctionName: aws.String(os.Getenv("functionName")),
InvocationType: aws.String(os.Getenv("invocationType")),
LogType: aws.String(os.Getenv("logType")),
Payload: bytes,
}
if qualifier := os.Getenv("qualifier"); qualifier != "" {
input.Qualifier = &qualifier
}
if clientContext := os.Getenv("clientContext"); clientContext != "" {
input.ClientContext = &clientContext
}
return input
}
func main() {
lambda.Start(proxy)
}