V3 server get facts

coolfacts/cmd/coolfacts_server/main.go

@@ -4,16 +4,34 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+
+	"github.com/FTBpro/go-workshop/coolfacts/coolfact"
+	"github.com/FTBpro/go-workshop/coolfacts/inmem"
 )
 
 func main() {
 	fmt.Println("Hello, Server!")
 
-	server := NewServer()
+	factsRepo := inmem.NewFactsRepository(seedFacts()...)
+	service := coolfact.NewService(factsRepo)
+	server := NewServer(service)
 
 	log.Println("starting server on port 9002")
 	log.Println("You can go to http://127.0.0.1:9002/ping")
 	if err := http.ListenAndServe(":9002", server); err != nil {
 		panic(fmt.Errorf("server crashed! err: %w", err))
 	}
 }
+
+func seedFacts() []coolfact.Fact {
+	return []coolfact.Fact{
+		{
+			Topic:       "Games",
+			Description: "Did you know sonic is a hedgehog?!",
+		},
+		{
+			Topic:       "TV",
+			Description: "You won't believe what happened to Arya!",
+		},
+	}
+}

coolfacts/cmd/coolfacts_server/server.go

@@ -8,15 +8,24 @@ import (
 	"strings"
 )
 
-type server struct{}
+type FactsService interface {
+	// TODO: add methods declerations
+	// 1. getFacts - returns a slice of fact.Fact and an error
+}
+
+type server struct {
+	// TODO: add factsService field
+}
 
 func NewServer() *server {
+	// TODO: returns an initializes server with the factsService
 	return &server{}
 }
 
 func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	log.Println("incoming request", r.Method, r.URL.Path)
 
+	// TODO: add case for GET /facts, that will call to `HandleGetFacts`
 	switch r.Method {
 	case http.MethodGet:
 		switch strings.ToLower(r.URL.Path) {
@@ -41,6 +50,30 @@ func (s *server) HandlePing(w http.ResponseWriter, _ *http.Request) {
 	}
 }
 
+func (s *server) HandleGetFacts(w http.ResponseWriter, _ *http.Request) {
+	log.Println("Handling getFact ...")
+
+	facts, err := s.factsService.GetFacts()
+	if err != nil {
+		s.HandleError(w, fmt.Errorf("server.GetFactsHandler: %w", err))
+		return
+	}
+
+	// TODO:
+	// 1. format the facts to a json response
+	// 2. write status 200
+	// 3. set content type application/json
+	// 4. write json response:
+	// 	{
+	//		"facts": [
+	//			{
+	//				"id": "..."
+	//				"description": "..."
+	//			},
+	//			...
+	//		]
+}
+
 func (s *server) HandleNotFound(w http.ResponseWriter, r *http.Request) {
 	log.Println("Handling notFound ...")
 

coolfacts/coolfact/fact.go

@@ -0,0 +1,5 @@
+package coolfact
+
+type Fact struct {
+	// TODO: add fields for the entity fact: topic and description (strings)
+}

coolfacts/coolfact/service.go

@@ -0,0 +1,18 @@
+package coolfact
+
+type Repository interface {
+	// TODO: add functions decleration
+	// - getFacts. Returns a slice of Fact and an error
+}
+
+type service struct {
+	// TODO: add field factsRepo
+}
+
+func NewService(factsRepo Repository) *service {
+	// TODO: init a new service with factsRepo
+}
+
+func (s *service) GetFacts() ([]Fact, error) {
+	// TODO: implement getFacts, using the factsRepo
+}

coolfacts/coolfact/service_test.go

@@ -0,0 +1,98 @@
+package coolfact_test
+
+import (
+	"fmt"
+	"math/rand"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/FTBpro/go-workshop/coolfacts/coolfact"
+	"github.com/FTBpro/go-workshop/coolfacts/inmem"
+)
+
+func Test_service_GetFacts(t *testing.T) {
+	facts := generateRandomFactsDesc(10)
+
+	testCases := []struct {
+		name      string
+		repoField coolfact.Repository
+		want      []coolfact.Fact
+		wantErr   bool
+	}{
+		{
+			name:      "with facts",
+			repoField: inmem.NewFactsRepository(facts...),
+			want:      facts,
+			wantErr:   false,
+		},
+		{
+			name:      "no facts - should get nil",
+			repoField: inmem.NewFactsRepository(),
+			want:      nil,
+			wantErr:   false,
+		},
+		{
+			name:      "repo returns error",
+			repoField: mockRepoError{},
+			want:      nil,
+			wantErr:   true,
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			s := coolfact.NewService(tc.repoField)
+			got, err := s.GetFacts()
+			if err != nil {
+				require.True(t, tc.wantErr, "got an unexpected error from service")
+				return
+			}
+
+			require.False(t, tc.wantErr, "expected an error but didn't receive one.")
+			expectEqualFacts(t, tc.want, got)
+		})
+	}
+}
+
+// generateRandomFactsDesc creates new random facts sorted by DESC
+func generateRandomFactsDesc(n int) []coolfact.Fact {
+	var facts []coolfact.Fact
+	for i := 0; i < n; i++ {
+		fact := randomFact()
+		facts = append(facts, fact)
+	}
+
+	return facts
+}
+
+func randomFact() coolfact.Fact {
+	rand.Seed(time.Now().UnixNano())
+	return coolfact.Fact{
+		Topic:       fmt.Sprintf("Topic %d", rand.Intn(10000)),
+		Description: fmt.Sprintf("Some Description %d", rand.Intn(10000)),
+	}
+}
+
+func expectEqualFacts(t *testing.T, expected, got []coolfact.Fact) {
+	require.Equalf(t, len(expected), len(got), "expectEqualFacts: different length")
+
+	for _, fact := range got {
+		require.Contains(t, expected, fact, "expectEqualFacts: got unexpected fact")
+	}
+
+	for _, fact := range expected {
+		require.Contains(t, got, fact, "expectEqualFacts: didn't got expected fact")
+	}
+}
+
+type mockRepoError struct {
+}
+
+func (m mockRepoError) GetFacts() ([]coolfact.Fact, error) {
+	return nil, fmt.Errorf("mock repo returns error")
+}
+
+func (m mockRepoError) CreateFact(fact coolfact.Fact) error {
+	return fmt.Errorf("mock repo returns error")
+}

coolfacts/go.mod

@@ -1,3 +1,11 @@
 module github.com/FTBpro/go-workshop/coolfacts
 
 go 1.18
+
+require github.com/stretchr/testify v1.8.1
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

coolfacts/go.sum

@@ -0,0 +1,17 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
+github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

coolfacts/inmem/factsrepo.go

@@ -0,0 +1,17 @@
+package inmem
+
+import (
+	"github.com/FTBpro/go-workshop/coolfacts/coolfact"
+)
+
+type factsRepo struct {
+	facts []coolfact.Fact
+}
+
+func NewFactsRepository(facts ...coolfact.Fact) *factsRepo {
+	// TODO: init facts repo
+}
+
+func (r *factsRepo) GetFacts() ([]coolfact.Fact, error) {
+	// TODO: implement
+}