go-apigw-http-adapter

Transform AWS API Gateway Lambda requests and responses to Go HTTP requests and responses.

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Releases

• 0.x - Current - Under review / development. Candidate for 1.x.

Links

• pkg.go.dev (documentation)
• Example Lambda Function

Limitations

1. httpadapter only supports v2 payloads. To handle v1 payloads use the restadapter.

Goals

1. Once version 1 has released: maintain the Go compatibility promise as much as possible.
2. As few dependencies as possible.
   1. Looking at you awslabs/aws-lambda-go-api-proxy.
   2. Currently only a single direct dependency on github.com/stretchr/testify for testing.

Contributing

1. Make changes.
2. Add / update tests.
3. Run make to fmt, vet, test, and build your changes.
4. Commit your changes.
5. Submit a PR.

HTTP Adapter Lambda Example

Example Lambda function that transforms the incoming HTTP API request, routes it to a http.ServerMux, and then returns the transformed result. See Example Lambda Function for a working example.

package main

import (
	"context"
	"net/http"
	"net/http/httptest"

	"github.com/aws/aws-lambda-go/lambda"
	"harrisonhjones.com/go-apigw-http-adapter/httpadapter"
)

func HandleRequest(ctx context.Context, req httpadapter.Request) (*httpadapter.Response, error) {
	// FYI: Request transformation.
	httpReq, err := httpadapter.TransformRequest(ctx, req)
	if err != nil {
		return nil, err
	}

	// FYI: Handle Request.
	httpRec := httptest.NewRecorder()

	mux := http.NewServeMux()
	// TODO: Add your own handlers here.
	mux.ServeHTTP(httpRec, httpReq)

	// FYI: Response transformation.
	httpRes, err := httpadapter.TransformResponse(httpRec.Result(), func(response *http.Response) bool {
		// FYI: Here you might inspect the response Content-Type to determine if the response should be encoded or not.
		return false // FYI: Don't encode the response.
	})
	if err != nil {
		return nil, err
	}

	return httpRes, nil
}

func main() {
	lambda.Start(HandleRequest)
}

REST Adapter Lambda Example

Example Lambda function that transforms the incoming REST API request, routes it to a http.ServerMux, and then returns the transformed result. See Example Lambda Function for a working example.

package main

import (
	"context"
	"net/http"
	"net/http/httptest"

	"github.com/aws/aws-lambda-go/lambda"
	"harrisonhjones.com/go-apigw-http-adapter/restadapter"
)

func HandleRequest(ctx context.Context, req restadapter.Request) (*restadapter.Response, error) {
	// FYI: Request transformation.
	httpReq, err := restadapter.TransformRequest(ctx, req)
	if err != nil {
		return nil, err
	}

	// FYI: Handle Request.
	httpRec := httptest.NewRecorder()

	mux := http.NewServeMux()
	// TODO: Add your own handlers here.
	mux.ServeHTTP(httpRec, httpReq)

	// FYI: Response transformation.
	httpRes, err := restadapter.TransformResponse(httpRec.Result(), func(response *http.Response) bool {
		// FYI: Here you might inspect the response Content-Type to determine if the response should be encoded or not.
		return false // FYI: Don't encode the response.
	})
	if err != nil {
		return nil, err
	}

	return httpRes, nil
}

func main() {
	lambda.Start(HandleRequest)
}