Gateway HTTP ListenAndServe for AWS Lambda (V1 and V2 API Gateway)

GitHub release

This Go library provides a drop-in replacement for http.ListenAndServe that is optimized for AWS Lambda's API Gateway (both V1 and V2). The library abstracts away the differences between API Gateway V1 and V2, allowing you to focus on building your application without worrying about the underlying details.

Features

Supports both API Gateway V1 (APIGatewayProxyRequest/APIGatewayProxyResponse) and V2 (APIGatewayV2HTTPRequest/APIGatewayV2HTTPResponse).
Simple, familiar interface that works with existing http.Handler code.
Lightweight, with the underlying complexity hidden.

Getting Started

Installation

Install the library using Go modules:
```
go get github.com/go-obvious/gateway
```
Import the package in your Go project:
```
import "github.com/go-obvious/gateway"
```

Usage

The library provides two simple entry points for API Gateway V1 and V2:

ListenAndServeV1: For API Gateway V1
ListenAndServeV2: For API Gateway V2

Example: API Gateway V1

For API Gateway V1, use ListenAndServeV1 as a replacement for http.ListenAndServe.

package main

import (
    "github.com/yourusername/gateway"
    "net/http"
    "encoding/json"
)

func myHandler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(map[string]string{"message": "Hello from V1 API Gateway!"})
}

func main() {
    // Use ListenAndServeV1 for API Gateway V1
    gateway.ListenAndServeV1(":8080", http.HandlerFunc(myHandler))
}

Example: API Gateway V2

For API Gateway V2, use ListenAndServeV2 as a replacement for http.ListenAndServe.

package main

import (
    "github.com/yourusername/gateway"
    "net/http"
    "encoding/json"
)

func myHandler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(map[string]string{"message": "Hello from V2 API Gateway!"})
}

func main() {
    // Use ListenAndServeV2 for API Gateway V2
    gateway.ListenAndServeV2(":8080", http.HandlerFunc(myHandler))
}

How It Works

ListenAndServeV1: Automatically parses and handles API Gateway V1 requests.
ListenAndServeV2: Automatically parses and handles API Gateway V2 requests.
Both versions use the familiar http.Handler interface, making it easy to port existing HTTP applications to AWS Lambda.

FAQ

1. Can I use this library outside of AWS Lambda?

No, this library is specifically designed to work with API Gateway in AWS Lambda environments.

2. Can I use both API Gateway versions in the same application?

Yes, you can use both ListenAndServeV1 and ListenAndServeV2 within the same application, depending on which API Gateway version you are targeting.

Contributing

Feel free to submit issues or pull requests for new features, bug fixes, or improvements.

License

This library is licensed under the MIT License. See LICENSE for more details.

# README