Developing Web Applications with Go

Developing Web Applications with Go.

Transcript

1. Developing Web Apps with Go Chang  Sau  Sheong   Sep  2014
3. What are 
 Web applications?
4. How does web applications work?
5. Browser/Client Server
6. Browser/Client Server HTTP  Request
7. Browser/Client Server HTTP  Request • Request  line GET /some/index.html HTTP/1.1
8. Browser/Client Server HTTP  Request • Request  line GET /some/index.html HTTP/1.1 • Request  headers
9. Browser/Client Server HTTP  Request • Request  line GET /some/index.html HTTP/1.1 • Request  headers • Empty  line
10. Browser/Client Server HTTP  Request • Request  line GET /some/index.html HTTP/1.1 • Request  headers • Empty  line • Message  body  (optional)
11. Browser/Client Server HTTP  Request HTTP  Response • Request  line GET /some/index.html HTTP/1.1 • Request  headers • Empty  line • Message  body  (optional)
12. Browser/Client Server HTTP  Request HTTP  Response • Request  line GET /some/index.html HTTP/1.1 • Request  headers • Empty  line • Message  body  (optional) • Status  line HTTP/1.1 200 OK
13. Browser/Client Server HTTP  Request HTTP  Response • Request  line GET /some/index.html HTTP/1.1 • Request  headers • Empty  line • Message  body  (optional) • Status  line HTTP/1.1 200 OK • Response  headers
14. Browser/Client Server HTTP  Request HTTP  Response • Request  line GET /some/index.html HTTP/1.1 • Request  headers • Empty  line • Message  body  (optional) • Status  line HTTP/1.1 200 OK • Response  headers • Empty  line
15. Browser/Client Server HTTP  Request HTTP  Response • Request  line GET /some/index.html HTTP/1.1 • Request  headers • Empty  line • Message  body  (optional) • Status  line HTTP/1.1 200 OK • Response  headers • Empty  line • Message  body  (optional)
16. Server
17. Server HTTP  Request
18. Server HTTP  Request 1.Process  request
19. Server HTTP  Request 1.Process  request 2.Execute  application   logic
20. Server HTTP  Request 1.Process  request 2.Execute  application   logic 3.Generate  response
21. Server HTTP  Request HTTP  Response 1.Process  request 2.Execute  application   logic 3.Generate  response
22. Parts of a web app • Routes
 Processing  the  request   • Templates
 Generating  response   • Store
 Persisting  data
23. What does Go have?
24. net/http
25. net/http 10
26. net/http • Server  -­‐  ServeMux(type),  Handler(type),   Handle(func),  HandleFunc(func),   ListenAndServe(func),  Serve(func) 10
27. net/http • Server  -­‐  ServeMux(type),  Handler(type),   Handle(func),  HandleFunc(func),   ListenAndServe(func),  Serve(func) • Client  -­‐  Get,  Post,  Head  etc  (func) 10
28. net/http • Server  -­‐  ServeMux(type),  Handler(type),   Handle(func),  HandleFunc(func),   ListenAndServe(func),  Serve(func) • Client  -­‐  Get,  Post,  Head  etc  (func) • Request,  Response,  ResponseWriter  (type) 10
29. net/http • Server  -­‐  ServeMux(type),  Handler(type),   Handle(func),  HandleFunc(func),   ListenAndServe(func),  Serve(func) • Client  -­‐  Get,  Post,  Head  etc  (func) • Request,  Response,  ResponseWriter  (type) • Cookie(type) 10
30. net/http • Server  -­‐  ServeMux(type),  Handler(type),   Handle(func),  HandleFunc(func),   ListenAndServe(func),  Serve(func) • Client  -­‐  Get,  Post,  Head  etc  (func) • Request,  Response,  ResponseWriter  (type) • Cookie(type) • Redirect(func) 10
31. html/template
32. Routes Process the request
33. Routes package main! ! import (! "fmt"! "net/http"! )! ! func handler(w http.ResponseWriter, r *http.Request) {! fmt.Fprintf(w, "Hello World, %s!", r.URL.Path[1:])! }! ! func main() {! http.HandleFunc("/", handler)! http.ListenAndServe(":8080", nil)! }!
34. Routes package main! ! import (! "fmt"! "net/http"! )! ! func main() {! mux := http.NewServeMux()! mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {! fmt.Fprintf(w, "Hello World, %s!", r.URL.Path[1:])! })! http.ListenAndServe(":8080", mux)! }!
35. Routes package main! ! import (! "fmt"! "net/http"! )! ! type MyHandler struct {}! ! func (h *MyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {! fmt.Fprintf(w, "Hello World, %s!", r.URL.Path[1:])! }! ! func main() {! http.ListenAndServe(":8080", &MyHandler{})! }!
36. Routes type MyHandler struct {}! ! func (h *MyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {! fmt.Fprintf(w, "Hello World, %s!", r.URL.Path[1:])! }! ! func main() {! server := &http.Server{! ! Addr: "0.0.0.0:8080",! ! Handler: &MyHandler{},! ! ReadTimeout: 10 * time.Second,! ! WriteTimeout: 600 * time.Second,! ! MaxHeaderBytes: 1 << 20,! }! server.ListenAndServe() ! }
37. Routes package main! ! import (! "fmt"! "net/http"! "github.com/julienschmidt/httprouter"! )! ! func main() {! router := httprouter.New() ! router.GET("/:name", hello) ! http.ListenAndServe(":8080", router)! }! ! func hello(w http.ResponseWriter, r *http.Request, p httprouter.Params) {! fmt.Fprintf(w, "Hello World, %s!", p.ByName("name"))! }!
38. Routes package main! ! import (! "fmt"! "net/http"! "github.com/julienschmidt/httprouter"! )! ! func main() {! router := httprouter.New() ! router.GET("/:name", hello) ! http.ListenAndServe(":8080", router)! }! ! func hello(w http.ResponseWriter, r *http.Request, p httprouter.Params) {! fmt.Fprintf(w, "Hello World, %s!", p.ByName("name"))! }! Not  part  of  standard   Go  libraries
39. Static assets? • Images   • Stylesheets  (CSS)   • Javascript   • Fonts
40. Serve Files func main() {! router := httprouter.New() ! router.ServeFiles("/images/*filepath", ! http.Dir("public/images"))! router.ServeFiles("/css/*filepath", ! http.Dir("public/css"))! router.ServeFiles(“/fonts/*filepath",! http.Dir("public/fonts"))! router.ServeFiles("/js/*filepath", ! http.Dir("public/js"))! http.ListenAndServe(":8080", router)! }! !
41. Templates Generate the response
42. Templates 21 Hello  World!  This  is   {  name  } name  =  “Sau  Sheong” Hello  World!  This  is   Sau  Sheong +
43. Templates
44. Templates • text/template  -­‐  data  driven  templates
45. Templates • text/template  -­‐  data  driven  templates • html/template  -­‐  data  driven  templates  for  HTML
46. Templates • text/template  -­‐  data  driven  templates • html/template  -­‐  data  driven  templates  for  HTML • Actions  (data  evaluations  or  control  structure)  -­‐   delimited  by  {{  and  }}
47. Templates • text/template  -­‐  data  driven  templates • html/template  -­‐  data  driven  templates  for  HTML • Actions  (data  evaluations  or  control  structure)  -­‐   delimited  by  {{  and  }} • Arguments  -­‐  values/variables  in  the  template
48. Templates • text/template  -­‐  data  driven  templates • html/template  -­‐  data  driven  templates  for  HTML • Actions  (data  evaluations  or  control  structure)  -­‐   delimited  by  {{  and  }} • Arguments  -­‐  values/variables  in  the  template • Pass  variables  to  template,  accessible  through   the  ‘dot’  {{ . }}
49. Templates • text/template  -­‐  data  driven  templates • html/template  -­‐  data  driven  templates  for  HTML • Actions  (data  evaluations  or  control  structure)  -­‐   delimited  by  {{  and  }} • Arguments  -­‐  values/variables  in  the  template • Pass  variables  to  template,  accessible  through   the  ‘dot’  {{ . }} • Can  define  variables  (start  with  $)
50. Templates
51. Templates • Pipeline  -­‐  a  chained  sequence  of  commands
52. Templates • Pipeline  -­‐  a  chained  sequence  of  commands • Function  -­‐  global  functions  (predefined)  or   custom  functions
53. Templates • Pipeline  -­‐  a  chained  sequence  of  commands • Function  -­‐  global  functions  (predefined)  or   custom  functions • Include  other  templates  with  keyword   ‘template’
54. Generating response
55. Generating response 1. Set  {{ define <template name> }}  in  the   template
56. Generating response 1. Set  {{ define <template name> }}  in  the   template 2. Allocate  the  template  (in  the  route)  using  New()
57. Generating response 1. Set  {{ define <template name> }}  in  the   template 2. Allocate  the  template  (in  the  route)  using  New() 3. Create  the  template  by  parsing  one  or  more   files  using  Parse(),  ParseFiles()  or   ParseGlob()  
58. Generating response 1. Set  {{ define <template name> }}  in  the   template 2. Allocate  the  template  (in  the  route)  using  New() 3. Create  the  template  by  parsing  one  or  more   files  using  Parse(),  ParseFiles()  or   ParseGlob()   4. Execute  the  template,  passing  the  output   writer  and  the  argument  (or  nil  if  none)
59. t1.html 25 {{ define "t1" }}! ! <!DOCTYPE html>! <html>! {{ template "header" }}! <body>! Hello World, {{ . }}!! </body>! </html>! ! {{ end }}!
60. header.html 26 {{ define "header" }}! <head>! <meta http-equiv="Content-Type" content="text/html; charset=utf-8">! <title>Template Example</title>! </head>! {{ end }}!
61. templates.go 27 package main! ! import (! "os"! "html/template"! )! ! func main() {! t := template.New("t1")! t = template.Must(t.ParseGlob("*.html")) ! t.Execute(writer, "Sau Sheong")! }!
62. templates.go 27 package main! ! import (! "os"! "html/template"! )! ! func main() {! t := template.New("t1")! t = template.Must(t.ParseGlob("*.html")) ! t.Execute(writer, "Sau Sheong")! }! Allocate
63. templates.go 27 package main! ! import (! "os"! "html/template"! )! ! func main() {! t := template.New("t1")! t = template.Must(t.ParseGlob("*.html")) ! t.Execute(writer, "Sau Sheong")! }! Create
64. templates.go 27 package main! ! import (! "os"! "html/template"! )! ! func main() {! t := template.New("t1")! t = template.Must(t.ParseGlob("*.html")) ! t.Execute(writer, "Sau Sheong")! }! Execute
65. templates.go 27 package main! ! import (! "os"! "html/template"! )! ! func main() {! t := template.New("t1")! t = template.Must(t.ParseGlob("*.html")) ! t.Execute(writer, "Sau Sheong")! }!
66. Response 28 <!DOCTYPE html>! <html>! ! <head>! <meta http-equiv="Content-Type" content="text/html; charset=utf-8">! <title>Template Example</title>! </head>! ! <body>! Hello World, Sau Sheong!! </body>! </html>
67. Response 28 <!DOCTYPE html>! <html>! ! <head>! <meta http-equiv="Content-Type" content="text/html; charset=utf-8">! <title>Template Example</title>! </head>! ! <body>! Hello World, Sau Sheong!! </body>! </html> from  header.html
68. Response 28 <!DOCTYPE html>! <html>! ! <head>! <meta http-equiv="Content-Type" content="text/html; charset=utf-8">! <title>Template Example</title>! </head>! ! <body>! Hello World, Sau Sheong!! </body>! </html> from  header.html replaces  {{  .  }}
69. templates.go 29 type Presentation struct {! Title string! Author string! }! ! func main() {! t := template.New("t2")! t = template.Must(t.ParseGlob("*.html")) ! presso := Presentation{! Title: "Write Web Applications with Go",! Author: "Chang Sau Sheong",! }! t.Execute(writer, presso)! }!
70. t2.html 30 {{ define "t2" }}! ! <!DOCTYPE html>! <html>! {{ template "header" }}! <body>! <h1>{{ .Title }}</h1>! <h3>{{ .Author}}</h3>! </body>! </html>! ! {{ end }}!
71. Response 31 <!DOCTYPE html>! <html>! ! <head>! <meta http-equiv="Content-Type" content="text/html; charset=utf-8">! <title>Template Example</title>! </head>! ! <body>! <h1>Write Web Applications with Go</h1>! <h3>Chang Sau Sheong</h3>! </body>! </html>!
72. Store Persist application data
73. SQL
74. SQL • Direct  SQL  statements
75. SQL • Direct  SQL  statements • Mappers  (ORMs)
76. SQL • Direct  SQL  statements • Mappers  (ORMs) • gorp
77. SQL • Direct  SQL  statements • Mappers  (ORMs) • gorp • hood
78. SQL • Direct  SQL  statements • Mappers  (ORMs) • gorp • hood • beego  orm
79. SQL • Direct  SQL  statements • Mappers  (ORMs) • gorp • hood • beego  orm • gorm
80. database/sql
81. 35 package main! ! import(! "log"! "fmt" ! "database/sql"! _ "github.com/lib/pq"! )! ! func main() {! db, _ := sql.Open("postgres", "dbname=blog sslmode=disable”)! defer db.Close() ! ! rows, err := db.Query("SELECT name, email FROM users WHERE email = $1", “sausheong@gmail.com”); if err != nil {! log.Fatal(err)! }! for rows.Next() {! var name, email string! if err := rows.Scan(&name, &email); err != nil {! log.Fatal(err)! }! fmt.Printf("%s - %s\n", name, email)! }! }!
82. Ok when small codebase
83. Ok when small codebase Painful otherwise
84. 37 https://github.com/jinzhu/gorm
85. 37 https://github.com/jinzhu/gorm This  is  NOT  part  of     standard  Go  libraries
86. Define models 38 type User struct {! Id int64! Uuid string `sql:"size:255;not null;unique"`! Email string `sql:"size:255"`! Password string `sql:"size:255"`! Name string `sql:"size:255"`! CreatedAt time.Time! }! ! type Session struct {! Id int64! Uuid string `sql:"size:255;not null;unique"`! UserId int64 ! CreatedAt time.Time! } // foreign key for User table
87. Initialize database 39 var DB gorm.DB! ! // initialize gorm! func init() {! var err error! DB, err = gorm.Open("postgres", "user=test password=test dbname=test sslmode=disable")! if err != nil {! panic(fmt.Sprintf("Got error when connect database, the error is '%v'", err))! }! migrate()! }
88. Migrate tables 40 // Create tables! func migrate() {! DB.Exec("DROP TABLE users;DROP TABLE sessions;")! DB.AutoMigrate(User{})! DB.AutoMigrate(Session{})! }
89. Create 41 user := User{Name: "Sau Sheong", ! Email: "sausheong@gmail.com", ! Password: “passw0rd”,! }! DB.Save(&user) ! !
90. Query 42 var user = User{}! // Get the first record! err := DB.Where("email = ?", ! "sausheong@gmail.com").First(&user).Error! if err != nil {! fmt.Println("Cannot retrieve this user:", err)! } ! ! // Get the multiple records! var users []User! err := DB.Where("email LIKE ?", ! "%@gmail.com").Find(&users).Error! if err != nil {! fmt.Println("Cannot retrieve users:", err)! }
91. Update & Delete 43 var user = User{}! // Get the first record! err := DB.Where("email = ?", ! "sausheong@gmail.com").First(&user).Error! if err != nil {! fmt.Println("Cannot retrieve this user:", err)! } ! ! // Update the name! user.Name = "Batman"! DB.Save(&user)! ! // Delete the record! DB.Delete(&user)!
92. Callbacks 44 // Before creating a user, add in the uuid! func (u *User) BeforeCreate() (err error) {! ! ! u.Password = encrypt(u.Password)! ! u.Uuid = createUUID()! ! return! }
93. Associations 45 user := User{Name: "Sau Sheong", ! Email: "sausheong@gmail.com", ! Password: "test",! }! DB.Save(&user) ! ! sess := Session{UserId: user.Id}! DB.Save(&sess)! ! var usr User! err := DB.Model(&sess).Related(&usr).Error! if err != nil {! fmt.Println("Cannot retrieve this user:", err)! } ! ! var session Session! err := DB.Model(&user).Related(&session).Error! if err != nil {! fmt.Println("Cannot retrieve this session:", err)! }
94. Associations 45 user := User{Name: "Sau Sheong", ! Email: "sausheong@gmail.com", ! Password: "test",! }! DB.Save(&user) ! ! sess := Session{UserId: user.Id}! DB.Save(&sess)! ! var usr User! err := DB.Model(&sess).Related(&usr).Error! if err != nil {! fmt.Println("Cannot retrieve this user:", err)! } ! ! var session Session! err := DB.Model(&user).Related(&session).Error! if err != nil {! fmt.Println("Cannot retrieve this session:", err)! } Retrieve  user  given   the  session
95. Associations 45 user := User{Name: "Sau Sheong", ! Email: "sausheong@gmail.com", ! Password: "test",! }! DB.Save(&user) ! ! sess := Session{UserId: user.Id}! DB.Save(&sess)! ! var usr User! err := DB.Model(&sess).Related(&usr).Error! if err != nil {! fmt.Println("Cannot retrieve this user:", err)! } ! ! var session Session! err := DB.Model(&user).Related(&session).Error! if err != nil {! fmt.Println("Cannot retrieve this session:", err)! } Retrieve  session   given  the  user
96. Associations 45 user := User{Name: "Sau Sheong", ! Email: "sausheong@gmail.com", ! Password: "test",! }! DB.Save(&user) ! ! sess := Session{UserId: user.Id}! DB.Save(&sess)! ! var usr User! err := DB.Model(&sess).Related(&usr).Error! if err != nil {! fmt.Println("Cannot retrieve this user:", err)! } ! ! var session Session! err := DB.Model(&user).Related(&session).Error! if err != nil {! fmt.Println("Cannot retrieve this session:", err)! }
97. Other features
98. Other features • Query  chains
99. Other features • Query  chains • Batch  updates  and  deletes
100. Other features • Query  chains • Batch  updates  and  deletes • Soft  delete  
101. Other features • Query  chains • Batch  updates  and  deletes • Soft  delete   • Associations
102. Other features • Query  chains • Batch  updates  and  deletes • Soft  delete   • Associations • Has  One
103. Other features • Query  chains • Batch  updates  and  deletes • Soft  delete   • Associations • Has  One • Belongs  To
104. Other features • Query  chains • Batch  updates  and  deletes • Soft  delete   • Associations • Has  One • Belongs  To • Has  Many
105. Other features • Query  chains • Batch  updates  and  deletes • Soft  delete   • Associations • Has  One • Belongs  To • Has  Many • Many  to  Many
106. Other features
107. Other features • FirstOrInit,  FirstOrCreate
108. Other features • FirstOrInit,  FirstOrCreate • Order,  Limit,  Offset,  Count
109. Other features • FirstOrInit,  FirstOrCreate • Order,  Limit,  Offset,  Count • Group,  Having,  Joins
110. Other features • FirstOrInit,  FirstOrCreate • Order,  Limit,  Offset,  Count • Group,  Having,  Joins • Transactions
111. Other features • FirstOrInit,  FirstOrCreate • Order,  Limit,  Offset,  Count • Group,  Having,  Joins • Transactions • Logger
112. Frameworks • Gorilla  web  toolkit   • Martini   • Gin  Gonic   • Beego   • Revel  
113. Testing Testing Go Web Apps
114. Testing is built-in
115. **_test.go
116. func TestXXX(t *testing.T) { }
117. func TestXXX(t *testing.T) { } //  Some  test  code
118. > go build
119. > go build Compile  Go  code
120. > go build > go test Compile  Go  code
121. > go build > go test Compile  Go  code Run  tests  on  Go  code
122. testing net/http/httptest
123. testing net/http/httptest Generic  testing   library
124. testing net/http/httptest Generic  testing   library Testing  library  for   web  applications
125. Unit Testing 55 package main! ! import( ! "testing"! )! ! // Test package function that adds a new user! func TestAddUser(t *testing.T) {! addUser("Sau Sheong", "sausheong@gmail.com", "password")! if val, ok := users["sausheong@gmail.com"]; !ok {! t.Errorf("Cannot add user")! } else {! if val.Name != "Sau Sheong" {! t.Errorf("User name is wrong")! }! }! }
126. HTTP Testing 56 package main! ! ...! ! func TestIndex(t *testing.T) { ! router := httprouter.New()! router.GET("/", index)! writer := httptest.NewRecorder()! request, _ := http.NewRequest("GET", "/", nil) ! router.ServeHTTP(writer, request)! ! if writer.Code != 302 {! t.Errorf("Response code is %v", writer.Code)! } ! }
127. HTTP Testing 57 func TestSignUp(t *testing.T) {! router := httprouter.New()! router.POST("/signup", createUser)! writer := httptest.NewRecorder()! body := strings.NewReader("name=Sau Sheong&email=sausheong@gmail.com&password=password")! request, _ := http.NewRequest("POST", "/signup", body)! request.Header.Add("Content-Type", "application/x-www- form-urlencoded")! router.ServeHTTP(writer, request)! ! if writer.Code != 302 {! t.Errorf("Response code is %v", writer.Code)! }! if writer.Header().Get("Location") != "/login" {! t.Errorf("Location is %v", writer.Header().Get("Location"))! }! }
128. HTTP Testing 58 func TestAuthenticate(t *testing.T) {! addUser("Sau Sheong", "sausheong@gmail.com", "password")! router := httprouter.New()! router.POST("/login", authenticate) ! writer := httptest.NewRecorder()! body := strings.NewReader("email=sausheong@gmail.com&password=pa ssword")! request, _ := http.NewRequest("POST", "/login", body)! request.Header.Add("Content-Type", "application/x-www- form-urlencoded")! router.ServeHTTP(writer, request)! ...! if !strings.HasPrefix(writer.Header().Get("Set- Cookie"), "pixelate_cookie") {! t.Errorf("Cookie not set")! }! }
129. Go on the Cloud Deploying to Google App Engine
130. Go App Engine 60
131. Go App Engine • Download  the  Go  App  Engine  SDK 60
132. Go App Engine • Download  the  Go  App  Engine  SDK • Install  Mercurial 60
133. Go App Engine • Download  the  Go  App  Engine  SDK • Install  Mercurial • Add  a  file  app.yaml  to  the  same  directory 60
134. Go App Engine • Download  the  Go  App  Engine  SDK • Install  Mercurial • Add  a  file  app.yaml  to  the  same  directory 60 application: pixelate! version: 1! runtime: go! api_version: go1! ! handlers:! - url: /.*! script: _go_app
135. Go App Engine 61
136. Go App Engine • Code  changes  required: 61
137. Go App Engine • Code  changes  required: • Change  all  package  names  from  main  to  the   application  name  (in  this  case  it  is   sausheong-pixelate) 61
138. Go App Engine • Code  changes  required: • Change  all  package  names  from  main  to  the   application  name  (in  this  case  it  is   sausheong-pixelate) • Change  the  main()  function  to  init() 61
139. Go App Engine • Code  changes  required: • Change  all  package  names  from  main  to  the   application  name  (in  this  case  it  is   sausheong-pixelate) • Change  the  main()  function  to  init() • Change  from  http.ListenAndServe()  to   http.Handle(mux) 61
140. Run locally 62
141. Run locally • Run  at  command  line: 62
142. Run locally • Run  at  command  line: 62 go_appengine/dev_appserver.py sausheong-pixelate
143. Run locally • Run  at  command  line: • Open  browser  to: 62 go_appengine/dev_appserver.py sausheong-pixelate
144. Run locally • Run  at  command  line: • Open  browser  to: 62 go_appengine/dev_appserver.py sausheong-pixelate http://localhost:8080
145. Deploy to Google App Engine 63
146. Deploy to Google App Engine • Create  app  on  Google  App  Engine 63
147. Deploy to Google App Engine • Create  app  on  Google  App  Engine • Run  at  command  line: 63 go_appengine/goapp deploy sausheong-pixelate
148. Deploy to Google App Engine • Create  app  on  Google  App  Engine • Run  at  command  line: 63 go_appengine/goapp deploy sausheong-pixelate
149. Deploy to Google App Engine • Create  app  on  Google  App  Engine • Run  at  command  line: • Open  browser  to: 63 go_appengine/goapp deploy sausheong-pixelate
150. Deploy to Google App Engine • Create  app  on  Google  App  Engine • Run  at  command  line: • Open  browser  to: 63 go_appengine/goapp deploy sausheong-pixelate http://sausheong-pixelate.appspot.com
151. My projects 64 • Pixelate
 Convert  a  JPEG  file  to  a  pixelated  version   • TodayReader
 A  faster,  simpler  Today  (newspaper)  reader   • GoAuthServ
 Simple  authentication  service   • Polyglot
 Multi-­‐language  web  framework
152. Thank you sausheong@gmail.com sauchang@paypal.com http://github.com/sausheong @sausheong