chiadapter: support API Gateway Events V2

Author: iamsalnikov

chi/adapter_v2.go

@@ -0,0 +1,61 @@
+// Package chiadapter add Chi support for the aws-severless-go-api library.
+// Uses the core package behind the scenes and exposes the New method to
+// get a new instance and Proxy method to send request to the Chi mux.
+package chiadapter
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/aws/aws-lambda-go/events"
+	"github.com/awslabs/aws-lambda-go-api-proxy/core"
+	"github.com/go-chi/chi/v5"
+)
+
+// ChiLambdaV2 makes it easy to send API Gateway proxy events V2 to a Chi
+// Mux. The library transforms the proxy event into an HTTP request and then
+// creates a proxy response object from the http.ResponseWriter
+type ChiLambdaV2 struct {
+	core.RequestAccessorV2
+
+	chiMux *chi.Mux
+}
+
+// NewV2 creates a new instance of the ChiLambdaV2 object.
+// Receives an initialized *chi.Mux object - normally created with chi.NewRouter().
+// It returns the initialized instance of the ChiLambda object.
+func NewV2(chi *chi.Mux) *ChiLambdaV2 {
+	return &ChiLambdaV2{chiMux: chi}
+}
+
+// Proxy receives an API Gateway proxy event V2, transforms it into an http.Request
+// object, and sends it to the chi.Mux for routing.
+// It returns a proxy response object generated from the http.ResponseWriter.
+func (g *ChiLambdaV2) Proxy(req events.APIGatewayV2HTTPRequest) (events.APIGatewayV2HTTPResponse, error) {
+	chiRequest, err := g.ProxyEventToHTTPRequest(req)
+	return g.proxyInternal(chiRequest, err)
+}
+
+// ProxyWithContext receives context and an API Gateway proxy event V2,
+// transforms them into an http.Request object, and sends it to the chi.Mux for routing.
+// It returns a proxy response object generated from the http.ResponseWriter.
+func (g *ChiLambdaV2) ProxyWithContext(ctx context.Context, req events.APIGatewayV2HTTPRequest) (events.APIGatewayV2HTTPResponse, error) {
+	chiRequest, err := g.EventToRequestWithContext(ctx, req)
+	return g.proxyInternal(chiRequest, err)
+}
+
+func (g *ChiLambdaV2) proxyInternal(chiRequest *http.Request, err error) (events.APIGatewayV2HTTPResponse, error) {
+	if err != nil {
+		return core.GatewayTimeoutV2(), core.NewLoggedError("Could not convert proxy event to request: %v", err)
+	}
+
+	respWriter := core.NewProxyResponseWriterV2()
+	g.chiMux.ServeHTTP(http.ResponseWriter(respWriter), chiRequest)
+
+	proxyResponse, err := respWriter.GetProxyResponse()
+	if err != nil {
+		return core.GatewayTimeoutV2(), core.NewLoggedError("Error while generating proxy response: %v", err)
+	}
+
+	return proxyResponse, nil
+}

chi/chilambda_v2_test.go

@@ -0,0 +1,47 @@
+package chiadapter_test
+
+import (
+	"context"
+	"log"
+	"net/http"
+
+	"github.com/aws/aws-lambda-go/events"
+	chiadapter "github.com/awslabs/aws-lambda-go-api-proxy/chi"
+	"github.com/go-chi/chi/v5"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("ChiLambda V2 tests", func() {
+	Context("Simple ping request", func() {
+		It("Proxies the event correctly", func() {
+			log.Println("Starting test")
+
+			r := chi.NewRouter()
+			r.Get("/ping", func(w http.ResponseWriter, r *http.Request) {
+				w.Write([]byte("pong"))
+			})
+
+			adapter := chiadapter.NewV2(r)
+
+			req := events.APIGatewayV2HTTPRequest{
+				RawPath: "/ping",
+				RequestContext: events.APIGatewayV2HTTPRequestContext{
+					HTTP: events.APIGatewayV2HTTPRequestContextHTTPDescription{
+						Method: http.MethodGet,
+					},
+				},
+			}
+
+			resp, err := adapter.ProxyWithContext(context.Background(), req)
+
+			Expect(err).To(BeNil())
+			Expect(resp.StatusCode).To(Equal(200))
+
+			resp, err = adapter.Proxy(req)
+			Expect(err).To(BeNil())
+			Expect(resp.StatusCode).To(Equal(200))
+		})
+	})
+})