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handler_test.go
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handler_test.go
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package awslambda
import (
"context"
"encoding/json"
"fmt"
"testing"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/transport"
)
type key int
const (
KeyBeforeOne key = iota
KeyBeforeTwo key = iota
KeyAfterOne key = iota
KeyEncMode key = iota
)
// Created based on github.com/aws/aws-lambda-go@v1.13.3/events.APIGatewayProxyRequest for the purposes of the tests below.
type apiGatewayProxyRequest struct {
Body string `json:"body"`
}
// Created based on github.com/aws/aws-lambda-go@v1.13.3/events.APIGatewayProxyResponse for the purposes of the tests below.
type apiGatewayProxyResponse struct {
StatusCode int `json:"statusCode"`
Body string `json:"body"`
}
func TestDefaultErrorEncoder(t *testing.T) {
ctx := context.Background()
rootErr := fmt.Errorf("root")
b, err := DefaultErrorEncoder(ctx, rootErr)
if b != nil {
t.Fatalf("DefaultErrorEncoder should return nil as []byte")
}
if err != rootErr {
t.Fatalf("DefaultErrorEncoder expects return back the given error.")
}
}
func TestInvokeHappyPath(t *testing.T) {
svc := serviceTest01{}
helloHandler := NewHandler(
makeTest01HelloEndpoint(svc),
decodeHelloRequestWithTwoBefores,
encodeResponse,
HandlerErrorHandler(transport.NewLogErrorHandler(log.NewNopLogger())),
HandlerBefore(func(
ctx context.Context,
payload []byte,
) context.Context {
ctx = context.WithValue(ctx, KeyBeforeOne, "bef1")
return ctx
}),
HandlerBefore(func(
ctx context.Context,
payload []byte,
) context.Context {
ctx = context.WithValue(ctx, KeyBeforeTwo, "bef2")
return ctx
}),
HandlerAfter(func(
ctx context.Context,
response interface{},
) context.Context {
ctx = context.WithValue(ctx, KeyAfterOne, "af1")
return ctx
}),
HandlerAfter(func(
ctx context.Context,
response interface{},
) context.Context {
if _, ok := ctx.Value(KeyAfterOne).(string); !ok {
t.Fatalf("Value was not set properly during multi HandlerAfter")
}
return ctx
}),
HandlerFinalizer(func(
_ context.Context,
resp []byte,
_ error,
) {
apigwResp := apiGatewayProxyResponse{}
err := json.Unmarshal(resp, &apigwResp)
if err != nil {
t.Fatalf("Should have no error, but got: %+v", err)
}
response := helloResponse{}
err = json.Unmarshal([]byte(apigwResp.Body), &response)
if err != nil {
t.Fatalf("Should have no error, but got: %+v", err)
}
expectedGreeting := "hello john doe bef1 bef2"
if response.Greeting != expectedGreeting {
t.Fatalf(
"Expect: %s, Actual: %s", expectedGreeting, response.Greeting)
}
}),
)
ctx := context.Background()
req, _ := json.Marshal(apiGatewayProxyRequest{
Body: `{"name":"john doe"}`,
})
resp, err := helloHandler.Invoke(ctx, req)
if err != nil {
t.Fatalf("Should have no error, but got: %+v", err)
}
apigwResp := apiGatewayProxyResponse{}
err = json.Unmarshal(resp, &apigwResp)
if err != nil {
t.Fatalf("Should have no error, but got: %+v", err)
}
response := helloResponse{}
err = json.Unmarshal([]byte(apigwResp.Body), &response)
if err != nil {
t.Fatalf("Should have no error, but got: %+v", err)
}
expectedGreeting := "hello john doe bef1 bef2"
if response.Greeting != expectedGreeting {
t.Fatalf(
"Expect: %s, Actual: %s", expectedGreeting, response.Greeting)
}
}
func TestInvokeFailDecode(t *testing.T) {
svc := serviceTest01{}
helloHandler := NewHandler(
makeTest01HelloEndpoint(svc),
decodeHelloRequestWithTwoBefores,
encodeResponse,
HandlerErrorEncoder(func(
ctx context.Context,
err error,
) ([]byte, error) {
apigwResp := apiGatewayProxyResponse{}
apigwResp.Body = `{"error":"yes"}`
apigwResp.StatusCode = 500
resp, err := json.Marshal(apigwResp)
return resp, err
}),
)
ctx := context.Background()
req, _ := json.Marshal(apiGatewayProxyRequest{
Body: `{"name":"john doe"}`,
})
resp, err := helloHandler.Invoke(ctx, req)
if err != nil {
t.Fatalf("Should have no error, but got: %+v", err)
}
apigwResp := apiGatewayProxyResponse{}
json.Unmarshal(resp, &apigwResp)
if apigwResp.StatusCode != 500 {
t.Fatalf("Expect status code of 500, instead of %d", apigwResp.StatusCode)
}
}
func TestInvokeFailEndpoint(t *testing.T) {
svc := serviceTest01{}
helloHandler := NewHandler(
makeTest01FailEndpoint(svc),
decodeHelloRequestWithTwoBefores,
encodeResponse,
HandlerBefore(func(
ctx context.Context,
payload []byte,
) context.Context {
ctx = context.WithValue(ctx, KeyBeforeOne, "bef1")
return ctx
}),
HandlerBefore(func(
ctx context.Context,
payload []byte,
) context.Context {
ctx = context.WithValue(ctx, KeyBeforeTwo, "bef2")
return ctx
}),
HandlerErrorEncoder(func(
ctx context.Context,
err error,
) ([]byte, error) {
apigwResp := apiGatewayProxyResponse{}
apigwResp.Body = `{"error":"yes"}`
apigwResp.StatusCode = 500
resp, err := json.Marshal(apigwResp)
return resp, err
}),
)
ctx := context.Background()
req, _ := json.Marshal(apiGatewayProxyRequest{
Body: `{"name":"john doe"}`,
})
resp, err := helloHandler.Invoke(ctx, req)
if err != nil {
t.Fatalf("Should have no error, but got: %+v", err)
}
apigwResp := apiGatewayProxyResponse{}
json.Unmarshal(resp, &apigwResp)
if apigwResp.StatusCode != 500 {
t.Fatalf("Expect status code of 500, instead of %d", apigwResp.StatusCode)
}
}
func TestInvokeFailEncode(t *testing.T) {
svc := serviceTest01{}
helloHandler := NewHandler(
makeTest01HelloEndpoint(svc),
decodeHelloRequestWithTwoBefores,
encodeResponse,
HandlerBefore(func(
ctx context.Context,
payload []byte,
) context.Context {
ctx = context.WithValue(ctx, KeyBeforeOne, "bef1")
return ctx
}),
HandlerBefore(func(
ctx context.Context,
payload []byte,
) context.Context {
ctx = context.WithValue(ctx, KeyBeforeTwo, "bef2")
return ctx
}),
HandlerAfter(func(
ctx context.Context,
response interface{},
) context.Context {
ctx = context.WithValue(ctx, KeyEncMode, "fail_encode")
return ctx
}),
HandlerErrorEncoder(func(
ctx context.Context,
err error,
) ([]byte, error) {
// convert error into proper APIGateway response.
apigwResp := apiGatewayProxyResponse{}
apigwResp.Body = `{"error":"yes"}`
apigwResp.StatusCode = 500
resp, err := json.Marshal(apigwResp)
return resp, err
}),
)
ctx := context.Background()
req, _ := json.Marshal(apiGatewayProxyRequest{
Body: `{"name":"john doe"}`,
})
resp, err := helloHandler.Invoke(ctx, req)
if err != nil {
t.Fatalf("Should have no error, but got: %+v", err)
}
apigwResp := apiGatewayProxyResponse{}
json.Unmarshal(resp, &apigwResp)
if apigwResp.StatusCode != 500 {
t.Fatalf("Expect status code of 500, instead of %d", apigwResp.StatusCode)
}
}
func decodeHelloRequestWithTwoBefores(
ctx context.Context, req []byte,
) (interface{}, error) {
apigwReq := apiGatewayProxyRequest{}
err := json.Unmarshal([]byte(req), &apigwReq)
if err != nil {
return apigwReq, err
}
request := helloRequest{}
err = json.Unmarshal([]byte(apigwReq.Body), &request)
if err != nil {
return request, err
}
valOne, ok := ctx.Value(KeyBeforeOne).(string)
if !ok {
return request, fmt.Errorf(
"Value was not set properly when multiple HandlerBefores are used")
}
valTwo, ok := ctx.Value(KeyBeforeTwo).(string)
if !ok {
return request, fmt.Errorf(
"Value was not set properly when multiple HandlerBefores are used")
}
request.Name += " " + valOne + " " + valTwo
return request, err
}
func encodeResponse(
ctx context.Context, response interface{},
) ([]byte, error) {
apigwResp := apiGatewayProxyResponse{}
mode, ok := ctx.Value(KeyEncMode).(string)
if ok && mode == "fail_encode" {
return nil, fmt.Errorf("fail encoding")
}
respByte, err := json.Marshal(response)
if err != nil {
return nil, err
}
apigwResp.Body = string(respByte)
apigwResp.StatusCode = 200
resp, err := json.Marshal(apigwResp)
return resp, err
}
type helloRequest struct {
Name string `json:"name"`
}
type helloResponse struct {
Greeting string `json:"greeting"`
}
func makeTest01HelloEndpoint(svc serviceTest01) endpoint.Endpoint {
return func(_ context.Context, request interface{}) (interface{}, error) {
req := request.(helloRequest)
greeting := svc.hello(req.Name)
return helloResponse{greeting}, nil
}
}
func makeTest01FailEndpoint(_ serviceTest01) endpoint.Endpoint {
return func(_ context.Context, request interface{}) (interface{}, error) {
return nil, fmt.Errorf("test error endpoint")
}
}
type serviceTest01 struct{}
func (ts *serviceTest01) hello(name string) string {
return fmt.Sprintf("hello %s", name)
}