AWS S3 Operations in Go Lang

Refer below request structure for creating your lambda code with api gateway

APIGatewayProxyRequest Struct

type APIGatewayProxyRequest struct {
    Resource                        string                        `json:"resource"` // The resource path defined in API Gateway
    Path                            string                        `json:"path"`     // The url path for the caller
    HTTPMethod                      string                        `json:"httpMethod"`
    Headers                         map[string]string             `json:"headers"`
    MultiValueHeaders               map[string][]string           `json:"multiValueHeaders"`
    QueryStringParameters           map[string]string             `json:"queryStringParameters"`
    MultiValueQueryStringParameters map[string][]string           `json:"multiValueQueryStringParameters"`
    PathParameters                  map[string]string             `json:"pathParameters"`
    StageVariables                  map[string]string             `json:"stageVariables"`
    RequestContext                  APIGatewayProxyRequestContext `json:"requestContext"`
    Body                            string                        `json:"body"`
    IsBase64Encoded                 bool                          `json:"isBase64Encoded,omitempty"`
}

High Level Steps Followed

1. Create mod go mod init github.com/aasisodiya/s3

2. Add below line to go.mod, where github.com/aasisodiya/aws is replaced with relative path of aws folder containing the required functions

   replace github.com/aasisodiya/aws => ../../aws
   

3. Call the required method from aws inside main.go

Troubleshooting

• Error: MissingRegion: could not find region configuration

  Below code doesn’t work

  svc := s3.New(session.New())
  

  Use this instead

  svc := s3.New(session.New(&aws.Config{Region: aws.String     ("REPLACE_WITH_YOUR_REGION_CODE")}))
  

Reference

• S3 Basic Example
• APIGatewayProxyRequest Structure
• Convert io.ReadCloser to a String