Lambda Go Servers

This following example uses Gin.

TODO: Add in the learnings from the local repo.

Resources

Gin + Lambda with AWSLabs proxy

package main

import (
    "log"
    "context"

    "github.com/aws/aws-lambda-go/events"
    "github.com/aws/aws-lambda-go/lambda"
    "github.com/awslabs/aws-lambda-go-api-proxy/gin"
    "github.com/gin-gonic/gin"
)

var ginLambda *ginadapter.GinLambda

func init() {
    // stdout and stderr are sent to AWS CloudWatch Logs
    log.Printf("Gin cold start")
    r := gin.Default()
    r.GET("/ping", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "pong",
        })
    })

    ginLambda = ginadapter.New(r)
}

// Handler will deal with Gin working with Lambda
func Handler(ctx context.Context, req events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
    // If no name is provided in the HTTP request body, throw an error
    return ginLambda.ProxyWithContext(ctx, req)
}

func main() {
    lambda.Start(Handler)
}
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Gin + Lambda with Apex Gateway

package main

import (
    "log"
    "net/http"
    "os"

    "github.com/apex/gateway"
    "github.com/gin-gonic/gin"
)

func helloHandler(c *gin.Context) {
    name := c.Param("name")
    c.String(http.StatusOK, "Hello %s", name)
}

func welcomeHandler(c *gin.Context) {
    c.String(http.StatusOK, "Hello World from Go")
}

func rootHandler(c *gin.Context) {
    c.JSON(http.StatusOK, gin.H{
        "text": "Welcome to gin lambda server.",
    })
}

func routerEngine() *gin.Engine {
    // set server mode
    gin.SetMode(gin.DebugMode)

    r := gin.New()

    // Global middleware
    r.Use(gin.Logger())
    r.Use(gin.Recovery())

    r.GET("/welcome", welcomeHandler)
    r.GET("/user/:name", helloHandler)
    r.GET("/", rootHandler)

    return r
}

func main() {
    addr := ":" + os.Getenv("PORT")
    log.Fatal(gateway.ListenAndServe(addr, routerEngine()))
}
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