Update quiz

client/client.go

@@ -7,6 +7,20 @@ type Response struct {
 	Content interface{} `json:"content"`
 }
 
+type Question struct {
+	Text string `json:"text"`
+}
+
+type Answer struct {
+	Text    string
+	Correct bool
+}
+
+type Quiz struct {
+	Question *Question `json:"question"`
+	Answers  []*Answer `json:"answers"`
+}
+
 type ReadAllQuizResponse struct {
 	Status  string         `json:"status"`
 	Content []*models.Quiz `json:"content"`
@@ -17,16 +31,24 @@ type CreateQuizResponse struct {
 	Content *models.Quiz `json:"content"`
 }
 
+type UpdateQuizResponse struct {
+	Status  string       `json:"status"`
+	Content *models.Quiz `json:"content"`
+}
+
 type CreateQuestionRequest struct {
-	Text string `json:"text"`
+	*Question
 }
 
 type CreateAnswerRequest struct {
-	Text    string
-	Correct bool
+	*Answer
 }
 
 type CreateQuizRequest struct {
-	Question *CreateQuestionRequest `json:"question"`
-	Answers  []*CreateAnswerRequest `json:"answers"`
+	*Quiz
+}
+
+type UpdateQuizRequest struct {
+	ID string
+	*Quiz
 }

go.mod

@@ -6,6 +6,7 @@ require github.com/sirupsen/logrus v1.8.1
 
 require (
 	github.com/google/uuid v1.3.0 // indirect
+	github.com/julienschmidt/httprouter v1.3.0 // indirect
 	github.com/kr/pretty v0.2.1 // indirect
 	github.com/kr/text v0.1.0 // indirect
 	github.com/remogatto/prettytest v0.0.0-20200211072524-6d385e11dcb8 // indirect

go.sum

@@ -1,6 +1,8 @@
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4dN7jwJOQ1U=
+github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
 github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=

hasher/hasher.go

@@ -11,15 +11,15 @@ type Hasher interface {
 	// hash calculated from the question using
 	// QuestionHash. Following hashes are calculated from the
 	// answers using AnswerHash.
-	QuizHashes(quiz *client.CreateQuizRequest) []string
+	QuizHashes(quiz *client.Quiz) []string
 
 	// QuestionHash returns an hash calculated from a field of
 	// Question struct.
-	QuestionHash(question *client.CreateQuestionRequest) string
+	QuestionHash(question *client.Question) string
 
 	// AnswerHash returns an hash calculated from a field of
 	// Answer struct.
-	AnswerHash(answer *client.CreateAnswerRequest) string
+	AnswerHash(answer *client.Answer) string
 
 	// Calculate calculates a checksum from all the given hashes.
 	Calculate(hashes []string) string

hasher/sha256/sha256.go

@@ -22,7 +22,7 @@ func NewDefault256Hasher(hashFn hasher.HashFunc) *Default256Hasher {
 	return &Default256Hasher{hashFn}
 }
 
-func (h *Default256Hasher) QuizHashes(quiz *client.CreateQuizRequest) []string {
+func (h *Default256Hasher) QuizHashes(quiz *client.Quiz) []string {
 	result := make([]string, 0)
 
 	result = append(result, h.QuestionHash(quiz.Question))
@@ -36,11 +36,11 @@ func (h *Default256Hasher) QuizHashes(quiz *client.CreateQuizRequest) []string {
 	return result
 }
 
-func (h *Default256Hasher) QuestionHash(question *client.CreateQuestionRequest) string {
+func (h *Default256Hasher) QuestionHash(question *client.Question) string {
 	return h.hashFn(question.Text)
 }
 
-func (h *Default256Hasher) AnswerHash(answer *client.CreateAnswerRequest) string {
+func (h *Default256Hasher) AnswerHash(answer *client.Answer) string {
 	return h.hashFn(answer.Text)
 }
 

server.go

@@ -9,6 +9,7 @@ import (
 	"git.andreafazzi.eu/andrea/probo/logger"
 	"git.andreafazzi.eu/andrea/probo/models"
 	"git.andreafazzi.eu/andrea/probo/store"
+	"github.com/julienschmidt/httprouter"
 )
 
 const jsonContentType = "application/json"
@@ -22,22 +23,24 @@ func NewQuizHubCollectorServer(store store.QuizHubCollectorStore) *QuizHubCollec
 	ps := new(QuizHubCollectorServer)
 	ps.store = store
 
-	router := http.NewServeMux()
+	router := httprouter.New()
 
-	router.Handle("/quizzes", logger.WithLogging(http.HandlerFunc(ps.testHandler)))
+	router.GET("/quizzes", httprouter.Handle(ps.readAllQuizzesHandler))
+	router.POST("/quizzes/create", httprouter.Handle(ps.createQuizHandler))
+	router.POST("/quizzes/:id/update", httprouter.Handle(ps.updateQuizHandler))
+	//	router.Handle("/quizzes", logger.WithLogging(http.HandlerFunc(ps.testHandler)))
 
-	ps.Handler = router
+	ps.Handler = logger.WithLogging(router)
 
 	return ps
 }
 
-func (ps *QuizHubCollectorServer) testHandler(w http.ResponseWriter, r *http.Request) {
-	switch r.Method {
-	case http.MethodGet:
+func (ps *QuizHubCollectorServer) readAllQuizzesHandler(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
 	w.Header().Set("content-type", jsonContentType)
 	json.NewEncoder(w).Encode(ps.readAllQuizzes(w, r))
+}
 
-	case http.MethodPost:
+func (ps *QuizHubCollectorServer) createQuizHandler(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
 	response := new(client.Response)
 
 	quiz, err := ps.createQuiz(w, r)
@@ -50,6 +53,19 @@ func (ps *QuizHubCollectorServer) testHandler(w http.ResponseWriter, r *http.Req
 	w.WriteHeader(http.StatusAccepted)
 	json.NewEncoder(w).Encode(response)
 }
+
+func (ps *QuizHubCollectorServer) updateQuizHandler(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
+	response := new(client.Response)
+
+	quiz, err := ps.updateQuiz(w, r, params.ByName("id"))
+	if err != nil {
+		response = &client.Response{Status: "error", Content: err.Error()}
+	}
+
+	response = &client.Response{Status: "success", Content: quiz}
+
+	w.WriteHeader(http.StatusAccepted)
+	json.NewEncoder(w).Encode(response)
 }
 
 func (ps *QuizHubCollectorServer) readAllQuizzes(w http.ResponseWriter, r *http.Request) *client.Response {
@@ -60,6 +76,27 @@ func (ps *QuizHubCollectorServer) readAllQuizzes(w http.ResponseWriter, r *http.
 	return &client.Response{Status: "success", Content: tests}
 }
 
+func (ps *QuizHubCollectorServer) updateQuiz(w http.ResponseWriter, r *http.Request, id string) (*models.Quiz, error) {
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	updateQuizReq := new(client.UpdateQuizRequest)
+
+	err = json.Unmarshal(body, &updateQuizReq)
+	if err != nil {
+		return nil, err
+	}
+
+	updatedQuiz, err := ps.store.UpdateQuiz(updateQuizReq)
+	if err != nil {
+		return nil, err
+	}
+
+	return updatedQuiz, nil
+}
+
 func (ps *QuizHubCollectorServer) createQuiz(w http.ResponseWriter, r *http.Request) (*models.Quiz, error) {
 	body, err := ioutil.ReadAll(r.Body)
 	if err != nil {

server_integration_test.go

@@ -38,8 +38,9 @@ func (t *integrationTestSuite) TestQuizCreateAndReadAll() {
 }
 `
 	createQuizResponse, err := t.createQuiz(server, payload)
-	t.True(err == nil)
+	t.True(err == nil, "Response should be decoded properly")
 
+	if !t.Failed() {
 		t.Equal("success", createQuizResponse.Status)
 		t.Equal("Question 1", createQuizResponse.Content.Question.Text)
 		t.Equal("Text of the answer 1", createQuizResponse.Content.Answers[0].Text)
@@ -48,13 +49,16 @@ func (t *integrationTestSuite) TestQuizCreateAndReadAll() {
 		t.True(createQuizResponse.Content.ID != "", "Test ID should not be empty")
 		t.True(createQuizResponse.Content.Question.ID != "", "Question ID should not be empty")
 		t.True(createQuizResponse.Content.Answers[0].ID != "", "Answer ID should not be empty")
+	}
 
 	readAllQuizResponse, err := t.readAllQuiz(server)
-	t.True(err == nil)
+	t.True(err == nil, "Response should be decoded properly")
 
+	if !t.Failed() {
 		t.True(len(readAllQuizResponse.Content) == 1, "Length of returned tests should be 1")
 		t.Equal("Question 1", readAllQuizResponse.Content[0].Question.Text)
 	}
+}
 
 func (t *integrationTestSuite) TestCatchDuplicateQuiz() {
 	server := NewQuizHubCollectorServer(

server_test.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"reflect"
+	"strings"
 	"testing"
 
 	"git.andreafazzi.eu/andrea/probo/client"
@@ -76,6 +77,51 @@ func (t *testSuite) TestGETQuestions() {
 	t.Equal(http.StatusOK, response.Code)
 }
 
+func (t *testSuite) TestUpdateQuiz() {
+	expectedResponse := &client.UpdateQuizResponse{
+		Status: "success",
+		Content: &models.Quiz{
+			Question: &models.Question{ID: "1", Text: "Question 1"},
+			Answers:  []*models.Answer{{}, {}, {}},
+		},
+	}
+
+	store := &StubTestHubCollectorStore{[]*models.Quiz{
+		{
+			Question: &models.Question{ID: "1", Text: "Question 1"},
+			Answers:  []*models.Answer{{}, {}, {}},
+		},
+	}}
+
+	server := NewQuizHubCollectorServer(store)
+
+	payload := `
+{
+  "question": {"text": "Update Question 1"},
+  "answers": [
+    {"text": "Text of the answer 1", "correct": true},
+    {"text": "Text of the answer 2"},
+    {"text": "Text of the answer 3"},
+    {"text": "Text of the answer 4"}
+  ]
+}
+`
+	request, _ := http.NewRequest(http.MethodPut, "/quizzes/1/update", strings.NewReader(payload))
+	response := httptest.NewRecorder()
+
+	server.ServeHTTP(response, request)
+
+	result, err := decodeUpdateQuizResponse(response.Body)
+
+	t.True(err == nil, fmt.Sprintf("Response should be decoded without errors: %v", err))
+
+	if !t.Failed() {
+		t.True(result.Status == expectedResponse.Status)
+		t.True(reflect.DeepEqual(result, expectedResponse))
+		t.Equal(http.StatusOK, response.Code)
+	}
+}
+
 func getResponse(body io.Reader) (response *client.ReadAllQuizResponse) {
 	err := json.NewDecoder(body).Decode(&response)
 	if err != nil {
@@ -85,6 +131,14 @@ func getResponse(body io.Reader) (response *client.ReadAllQuizResponse) {
 	return
 }
 
+func decodeUpdateQuizResponse(body io.Reader) (response *client.UpdateQuizResponse, err error) {
+	err = json.NewDecoder(body).Decode(&response)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to parse the response %q from the server: %v", body, err)
+	}
+	return
+}
+
 func testsAreEqual(got, want *client.ReadAllQuizResponse) bool {
 	return reflect.DeepEqual(got, want)
 }

store/memory/memory.go

@@ -107,7 +107,49 @@ func (s *MemoryQuizHubCollectorStore) ReadAllQuizzes() ([]*models.Quiz, error) {
 }
 
 func (s *MemoryQuizHubCollectorStore) CreateQuiz(r *client.CreateQuizRequest) (*models.Quiz, error) {
-	hashes := s.hasher.QuizHashes(r)
+	hashes := s.hasher.QuizHashes(r.Quiz)
+
+	quizID := uuid.New().String()
+	quizHash := hashes[len(hashes)-1]
+
+	quiz := s.readQuiz(quizHash)
+	if quiz != nil { // Quiz is already present in the store
+		return quiz, nil
+	}
+
+	quiz = new(models.Quiz)
+
+	questionHash := hashes[0]
+	q := s.readQuestion(questionHash)
+	if q == nil { // if the question is not in the store then we should add it
+		q = s.createQuestion(questionHash, &models.Question{
+			ID:   uuid.New().String(),
+			Text: r.Question.Text,
+		})
+	}
+
+	// Populate Question field
+	quiz.Question = q
+	for i, answer := range r.Answers {
+		answerHash := hashes[i+1]
+		a := s.readAnswer(answerHash)
+		if a == nil { // if the answer is not in the store add it
+			a = s.createAnswer(answerHash, &models.Answer{
+				ID:   uuid.New().String(),
+				Text: answer.Text,
+			})
+			if answer.Correct {
+				quiz.Correct = a // s.readAnswer(answerID)
+			}
+		}
+		quiz.Answers = append(quiz.Answers, a)
+	}
+
+	return s.createQuiz(quizID, quizHash, quiz), nil
+}
+
+func (s *MemoryQuizHubCollectorStore) UpdateQuiz(r *client.UpdateQuizRequest) (*models.Quiz, error) {
+	hashes := s.hasher.QuizHashes(r.Quiz)
 
 	quizID := uuid.New().String()
 	quizHash := hashes[len(hashes)-1]

store/store.go

@@ -8,4 +8,5 @@ import (
 type QuizHubCollectorStore interface {
 	ReadAllQuizzes() ([]*models.Quiz, error)
 	CreateQuiz(r *client.CreateQuizRequest) (*models.Quiz, error)
+	UpdateQuiz(r *client.UpdateQuizRequest) (*models.Quiz, error)
 }