Go Pattern Design

Transcript

1. Go Pattern Design Mic Pantakan Ketbamrung
2. • Hexagonal Architecture • Port and Adapters pattern • Example Agenda
3. Dependency
5. type cart struct{} 
 func (c *cart) checkout() (string, error) { // do something before update inventory... body := strings.NewReader(`{ "id": "line_sticker_001", "quantity": -1 }`) res, _ := http.Post("https://line.me/myshop/v1/inventory", "application/json", body) return res.Status, nil } Checkout
6. Matías Varela “Before writing the first line of code, one may ask: How should I organize the project? or, Which component should I write first?. If these questions are difficult to answer is because you are not following a software architecture pattern.” https://medium.com/@matiasvarela/hexagonal-architecture-in-go-cfd4e436faa3
7. Port and Adapters 
 ( A.K.A Hexagonal Architecture ) 
 The hexagonal architecture was defined by Alistair Cockburn in 2005
8. Clean Architecture
9. Port and Adapters
10. Driver • Usb C
 
 Driven • 3.5 jack Port https://medium.com/@matiasvarela/hexagonal-architecture-in-go-cfd4e436faa3
11. Adapters Driver • Usb C 
 
 Driven • 3.5 jack https://medium.com/@matiasvarela/hexagonal-architecture-in-go-cfd4e436faa3
12. Dependency Injection • Able to change easily https://medium.com/@matiasvarela/hexagonal-architecture-in-go-cfd4e436faa3
13. GO
14. type macBook struct{} func (*MacBook) chargeWithUsbC() { fmt.Println("MacBook is charging") } type person struct{} func (*person) charge(laptop macBook) { laptop.chargeWithUsbC() } func main() { person := &person{} myMacBook := macBook{} person.charge(myMacBook) } Comparing type usbC interface { chargeWithUsbC() } type macBook struct{} func (*macBook) chargeWithUsbC() { fmt.Println("MacBook is charging") } type person struct{} func (*person) charge(u usbC) { u.chargeWithUsbC() } func main() { person := &person{} myMacBook := &macBook{} person.charge(myMacBook) }
15. type macBook struct{} func (*MacBook) chargeWithUsbC() { fmt.Println("MacBook is charging") } type person struct{} func (*person) charge(laptop macBook) { laptop.chargeWithUsbC() } func main() { person := &person{} myMacBook := macBook{} person.charge(myMacBook) } Comparing
16. Comparing type usbC interface { chargeWithUsbC() } type macBook struct{} func (*macBook) chargeWithUsbC() { fmt.Println("MacBook is charging") } type person struct{} func (*person) charge(u usbC) { u.chargeWithUsbC() } func main() { person := &person{} myMacBook := &macBook{} person.charge(myMacBook) }
17. type usbC interface { chargeWithUsbC() } type macBook struct{} func (*macBook) chargeWithUsbC() { fmt.Println("MacBook is charging") } type person struct{} func (*person) charge(u usbC) { u.chargeWithUsbC() } func main() { person := &person{} myMacBook := &macBook{} person.charge(myMacBook) } Port
18. type usbC interface { chargeWithUsbC() } type macBook struct{} func (*macBook) chargeWithUsbC() { fmt.Println("MacBook is charging") } type person struct{} func (*person) charge(u usbC) { u.chargeWithUsbC() } func main() { person := &person{} myMacBook := &macBook{} person.charge(myMacBook) } Port
19. type usbC interface { chargeWithUsbC() } type macBook struct{} func (*macBook) chargeWithUsbC() { fmt.Println("MacBook is charging") } type person struct{} func (*person) charge(u usbC) { u.chargeWithUsbC() } func main() { person := &person{} myMacBook := &macBook{} person.charge(myMacBook) } Port
20. type usbC interface { chargeWithUsbC() } type macBook struct{} func (*macBook) chargeWithUsbC() { fmt.Println("MacBook is charging") } type person struct{} func (*person) charge(u usbC) { u.chargeWithUsbC() } func main() { person := &person{} myMacBook := &macBook{} person.charge(myMacBook) } Port
21. type iPhone struct{} func (*iPhone) chargeWithLightingPort() { fmt.Println("iPhone is charging") } Port
22. type iPhone struct{} func (*iPhone) chargeWithLightingPort() { fmt.Println("iPhone is charging") } type lightingToUsbC struct { iPhone *iPhone } func (*lightingToUsbC) chargeWithUsbC() { l.iPhone.chargeWithLightingPort() } Adapters
23. type usbC interface { chargeWithUsbC() } 
 type iPhone struct{} func (*iPhone) chargeWithLightingPort() { fmt.Println("iPhone is charging") } type lightingToUsbC struct { iPhone *iPhone } func (l *lightingToUsbC) chargeWithUsbC() { l.iPhone.chargeWithLightingPort() } func main() { person := &person{} myPhone := &lightingToUsbC{&iPhone{}} person.charge(myPhone) } Port & Adapter
24. Example
25. type cart struct{} 
 func (c *cart) checkout() (string, error) { // do something before update inventory... body := strings.NewReader(`{ "id": "line_sticker_001", "quantity": -1 }`) res, _ := http.Post("https://line.me/myshop/v1/inventory", "application/json", body) return res.Status, nil } cart.go
26. func Test_CheckoutSuccess(t *testing.T) { testCart := cart{} status, _ := testCart.checkout() want := "200 OK" if status != want { t.Errorf("status should be %s but got %s", want, status) } } cart_test.go
27. func Test_CheckoutSuccess(t *testing.T) { testCart := cart{} status, _ := testCart.checkout() want := "200 OK" if status != want { t.Errorf("status should be %s but got %s", want, status) } } cart_test.go
28. Implementation
29. type httpClient interface { Post(url, contentType string, body io.Reader) (*http.Response, error) } type cart struct { httpClient } func (c *cart) checkout() string { // do something before update inventory... body := strings.NewReader(`{ "id": "line_sticker_001", "quantity": -1 }`) res, _ := c.Post("https://line.me/myshop/v1/inventory", "application/json", body) return res.Status } func main() { cli := http.DefaultClient cart := &cart{cli} cart.checkout() } cart.go
30. type httpClient interface { Post(url, contentType string, body io.Reader) (*http.Response, error) } type cart struct { httpClient } func (c *cart) checkout() string { // do something before update inventory... body := strings.NewReader(`{ "id": "line_sticker_001", "quantity": -1 }`) res, _ := c.Post("https://line.me/myshop/v1/inventory", "application/json", body) return res.Status } func main() { cli := http.DefaultClient cart := &cart{cli} cart.checkout() } cart.go
31. type httpClient interface { Post(url, contentType string, body io.Reader) (*http.Response, error) } type cart struct { httpClient } func (c *cart) checkout() string { // do something before update inventory... body := strings.NewReader(`{ "id": "line_sticker_001", "quantity": -1 }`) res, _ := c.Post("https://line.me/myshop/v1/inventory", "application/json", body) return res.Status } func main() { cli := http.DefaultClient cart := &cart{cli} cart.checkout() } cart.go
32. type httpClient interface { Post(url, contentType string, body io.Reader) (*http.Response, error) } type cart struct { httpClient } func (c *cart) checkout() string { // do something before update inventory... body := strings.NewReader(`{ "id": "line_sticker_001", "quantity": -1 }`) res, _ := c.Post("https://line.me/myshop/v1/inventory", "application/json", body) return res.Status } func main() { cli := http.DefaultClient cart := &cart{cli} cart.checkout() } cart.go
33. type httpClient interface { Post(url, contentType string, body io.Reader) (*http.Response, error) } type cart struct { httpClient } func (c *cart) checkout() string { // do something before update inventory... body := strings.NewReader(`{ "id": "line_sticker_001", "quantity": -1 }`) res, _ := c.Post("https://line.me/myshop/v1/inventory", "application/json", body) return res.Status } func main() { cli := http.DefaultClient cart := &cart{cli} cart.checkout() } cart.go
34. type mockSuccessClient struct{} func (m *mockSuccessClient) Post(url, contentType string, body io.Reader) (*http.Response, error) { res := &http.Response{ Status: "200 OK", } return res, nil } func Test_CheckoutSuccess(t *testing.T) { myClient := &mockSuccessClient{} cart := &cart{myClient} status := cart.checkout() want := "200 OK" if status != want { t.Errorf("status should be %s but got %s", want, status) } } cart_test.go
35. type mockSuccessClient struct{} func (m *mockSuccessClient) Post(url, contentType string, body io.Reader) (*http.Response, error) { res := &http.Response{ Status: "200 OK", } return res, nil } func Test_CheckoutSuccess(t *testing.T) { myClient := &mockSuccessClient{} cart := &cart{myClient} status := cart.checkout() want := "200 OK" if status != want { t.Errorf("status should be %s but got %s", want, status) } } cart_test.go
36. Change HTTP Client
37. Resty docs https://github.com/go-resty/resty
38. Resty docs https://github.com/go-resty/resty
39. type myResty struct { *resty.Client } func NewRestyClient() httpClient { return myResty{} } func (client myResty) Post(url, contentType string, body io.Reader) (*http.Response, error) { resp, _ := client.R(). SetBody(body). ForceContentType(contentType). Post(“https://line.me/myshop/v1/inventory") return resp.RawResponse, nil } . . . func main() { newCli := NewRestyClient() cart := &cart{newCli} cart.checkout() } my_restry.go