v3-server-get-facts-solution

coolfacts/cmd/coolfacts_server/server.go

@@ -6,31 +6,34 @@ import (
 	"log"
 	"net/http"
 	"strings"
+
+	"github.com/FTBpro/go-workshop/coolfacts/coolfact"
 )
 
 type FactsService interface {
-	// TODO: add methods declerations
-	// 1. getFacts - returns a slice of fact.Fact and an error
+	GetFacts() ([]coolfact.Fact, error)
 }
 
 type server struct {
-	// TODO: add factsService field
+	factsService FactsService
 }
 
-func NewServer() *server {
-	// TODO: returns an initializes server with the factsService
-	return &server{}
+func NewServer(factsService FactsService) *server {
+	return &server{
+		factsService: factsService,
+	}
 }
 
 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) {
 		case "/ping":
 			s.HandlePing(w, r)
+		case "/facts":
+			s.HandleGetFacts(w, r)
 		default:
 			s.HandleNotFound(w, r)
 		}
@@ -59,19 +62,26 @@ func (s *server) HandleGetFacts(w http.ResponseWriter, _ *http.Request) {
 		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": "..."
-	//			},
-	//			...
-	//		]
+	// we first format the facts to map[string]interface.
+	formattedFacts := make([]map[string]interface{}, len(facts))
+	for i, coolFact := range facts {
+		formattedFacts[i] = map[string]interface{}{
+			"topic":       coolFact.Topic,
+			"description": coolFact.Description,
+		}
+	}
+
+	response := s.formatGetFactsResponse(facts)
+
+	// write status and content-type
+	// status must be written before the body
+	w.WriteHeader(http.StatusOK)
+	w.Header().Set("Content-Type", "application/json")
+
+	// write the body. We use json encoding
+	if err := json.NewEncoder(w).Encode(response); err != nil {
+		fmt.Printf("HandleGetFacts ERROR writing response: %s", err)
+	}
 }
 
 func (s *server) HandleNotFound(w http.ResponseWriter, r *http.Request) {
@@ -102,3 +112,17 @@ func (s *server) HandleError(w http.ResponseWriter, err error) {
 		fmt.Printf("HandleGetFacts ERROR writing response: %s", err)
 	}
 }
+
+func (s *server) formatGetFactsResponse(facts []coolfact.Fact) map[string]interface{} {
+	formattedFacts := make([]map[string]interface{}, len(facts))
+	for i, coolFact := range facts {
+		formattedFacts[i] = map[string]interface{}{
+			"topic":       coolFact.Topic,
+			"description": coolFact.Description,
+		}
+	}
+
+	return map[string]interface{}{
+		"facts": formattedFacts,
+	}
+}

coolfacts/coolfact/fact.go

@@ -1,5 +1,6 @@
 package coolfact
 
 type Fact struct {
-	// TODO: add fields for the entity fact: topic and description (strings)
+	Topic       string
+	Description string
 }

coolfacts/coolfact/service.go

@@ -1,18 +1,26 @@
 package coolfact
 
+import "fmt"
+
 type Repository interface {
-	// TODO: add functions decleration
-	// - getFacts. Returns a slice of Fact and an error
+	GetFacts() ([]Fact, error)
 }
 
 type service struct {
-	// TODO: add field factsRepo
+	factsRepo Repository
 }
 
 func NewService(factsRepo Repository) *service {
-	// TODO: init a new service with factsRepo
+	return &service{
+		factsRepo: factsRepo,
+	}
 }
 
 func (s *service) GetFacts() ([]Fact, error) {
-	// TODO: implement getFacts, using the factsRepo
+	facts, err := s.factsRepo.GetFacts()
+	if err != nil {
+		return nil, fmt.Errorf("factsService.GetFacts: %w", err)
+	}
+
+	return facts, nil
 }

coolfacts/docs/ex3-get-facts.md

@@ -264,10 +264,11 @@ As mentioned before, you will implement a new API for the `server`, what you wil
   - Write status 200.
   - Set "content-type" header to "application/json".
 
-### Building and Running
+## Building and Running
 
 If everything is implemented well, this is what the final result should look like when running the program:
-![factsgif](https://user-images.githubusercontent.com/5252381/204143457-6eaf59d3-6c52-4fbb-8d2a-19d22436cbd8.gif)
+![v3-get-facts](https://user-images.githubusercontent.com/5252381/206864380-9890158e-c841-4d9a-b772-cd779388e58e.gif)
+
 
 # Full walkthrough
 In the following section you fill find a full walkthrough. Use it in case you are stuck.

coolfacts/inmem/factsrepo.go

@@ -9,9 +9,11 @@ type factsRepo struct {
 }
 
 func NewFactsRepository(facts ...coolfact.Fact) *factsRepo {
-	// TODO: init facts repo
+	return &factsRepo{
+		facts: facts,
+	}
 }
 
 func (r *factsRepo) GetFacts() ([]coolfact.Fact, error) {
-	// TODO: implement
+	return r.facts, nil
 }