Feature/Implements client generic

pkg/internal/httpclient/client.go

@@ -0,0 +1,141 @@
+package httpclient
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"runtime"
+	"strings"
+
+	"github.com/google/uuid"
+	"github.com/mercadopago/sdk-go/pkg/config"
+)
+
+const (
+	domainMP = "https://api.mercadopago.com"
+
+	currentSDKVersion string = "x.x.x"
+	productID         string = "abc"
+	accept            string = "application/json"
+	contentType       string = "application/json; charset=UTF-8"
+
+	productIDHeader     = "X-Product-Id"
+	acceptHeader        = "Accept"
+	contentTypeHeader   = "Content-Type"
+	userAgentHeader     = "User-Agent"
+	trackingIDHeader    = "X-Tracking-Id"
+	requestIDHeader     = "X-Request-Id"
+	authorizationHeader = "Authorization"
+	idempotencyHeader   = "X-Idempotency-Key"
+
+	corporationIDHeader = "X-Corporation-Id"
+	integratorIDHeader  = "X-Integrator-Id"
+	platformIDHeader    = "X-Platform-Id"
+)
+
+var (
+	userAgent  = fmt.Sprintf("MercadoPago Go SDK/%s", currentSDKVersion)
+	trackingID = fmt.Sprintf("platform:%s,type:SDK%s,so;", runtime.Version(), currentSDKVersion)
+)
+
+// Get makes requests with the GET method
+// Will return the struct specified in Generics
+func Get[T any](ctx context.Context, cfg *config.Config, path string) (*T, error) {
+	req, err := makeRequest(ctx, cfg, http.MethodGet, path, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return send[T](cfg.Requester, req)
+}
+
+// Post makes requests with the POST method
+// Will return the struct specified in Generics
+func Post[T any](ctx context.Context, cfg *config.Config, path string, body any) (*T, error) {
+	req, err := makeRequest(ctx, cfg, http.MethodPost, path, body)
+	if err != nil {
+		return nil, err
+	}
+
+	return send[T](cfg.Requester, req)
+}
+
+// Put makes requests with the PUT method
+// Will return the struct specified in Generics
+func Put[T any](ctx context.Context, cfg *config.Config, path string, body any) (*T, error) {
+	req, err := makeRequest(ctx, cfg, http.MethodPut, path, body)
+	if err != nil {
+		return nil, err
+	}
+
+	return send[T](cfg.Requester, req)
+}
+
+// Delete makes requests with the DELETE method
+// Will return the struct specified in Generics
+func Delete[T any](ctx context.Context, cfg *config.Config, path string, body any) (*T, error) {
+	req, err := makeRequest(ctx, cfg, http.MethodDelete, path, body)
+	if err != nil {
+		return nil, err
+	}
+
+	return send[T](cfg.Requester, req)
+}
+
+func makeRequest(ctx context.Context, cfg *config.Config, method, path string, body any) (*http.Request, error) {
+	req, err := buildHTTPRequest(ctx, method, path, body)
+	if err != nil {
+		return nil, fmt.Errorf("error creating request: %w", err)
+	}
+
+	makeHeaders(req, cfg)
+
+	return req, nil
+}
+
+func makeHeaders(req *http.Request, cfg *config.Config) {
+	req.Header.Set(productIDHeader, productID)
+	req.Header.Set(acceptHeader, accept)
+	req.Header.Set(contentTypeHeader, contentType)
+	req.Header.Set(userAgentHeader, userAgent)
+	req.Header.Set(trackingIDHeader, trackingID)
+	req.Header.Set(authorizationHeader, "Bearer "+cfg.AccessToken)
+	req.Header.Set(idempotencyHeader, uuid.New().String())
+	req.Header.Set(requestIDHeader, uuid.New().String())
+
+	if cfg.CorporationID != "" {
+		req.Header.Set(corporationIDHeader, cfg.CorporationID)
+	}
+	if cfg.IntegratorID != "" {
+		req.Header.Set(integratorIDHeader, cfg.IntegratorID)
+	}
+	if cfg.PlatformID != "" {
+		req.Header.Set(platformIDHeader, cfg.PlatformID)
+	}
+}
+
+func buildHTTPRequest(ctx context.Context, method, path string, body any) (*http.Request, error) {
+	b, err := buildBody(body)
+	if err != nil {
+		return nil, err
+	}
+
+	var url = domainMP + path
+
+	return http.NewRequestWithContext(ctx, method, url, b)
+}
+
+func buildBody(body any) (io.Reader, error) {
+	if body == nil {
+		return nil, nil
+	}
+
+	b, err := json.Marshal(&body)
+	if err != nil {
+		return nil, fmt.Errorf("error marshaling request body: %w", err)
+	}
+
+	return strings.NewReader(string(b)), nil
+}

pkg/internal/httpclient/gateway.go

@@ -1,65 +1,15 @@
 package httpclient
 
 import (
-	"context"
+	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
-	"runtime"
 
-	"github.com/google/uuid"
-	"github.com/mercadopago/sdk-go/pkg/config"
 	"github.com/mercadopago/sdk-go/pkg/internal/requester"
 )
 
-const (
-	currentSDKVersion string = "x.x.x"
-	productID         string = "abc"
-	accept            string = "application/json"
-	contentType       string = "application/json; charset=UTF-8"
-
-	productIDHeader     = "X-Product-Id"
-	acceptHeader        = "Accept"
-	contentTypeHeader   = "Content-Type"
-	userAgentHeader     = "User-Agent"
-	trackingIDHeader    = "X-Tracking-Id"
-	authorizationHeader = "Authorization"
-	idempotencyHeader   = "X-Idempotency-Key"
-
-	corporationIDHeader = "X-Corporation-Id"
-	integratorIDHeader  = "X-Integrator-Id"
-	platformIDHeader    = "X-Platform-Id"
-)
-
-var (
-	userAgent  = fmt.Sprintf("MercadoPago Go SDK/%s", currentSDKVersion)
-	trackingID = fmt.Sprintf("platform:%s,type:SDK%s,so;", runtime.Version(), currentSDKVersion)
-)
-
-// Send wraps needed options before send api call.
-func Send(ctx context.Context, cfg *config.Config, req *http.Request) ([]byte, error) {
-	req.Header.Set(productIDHeader, productID)
-	req.Header.Set(acceptHeader, accept)
-	req.Header.Set(contentTypeHeader, contentType)
-	req.Header.Set(userAgentHeader, userAgent)
-	req.Header.Set(trackingIDHeader, trackingID)
-	req.Header.Set(authorizationHeader, "Bearer "+cfg.AccessToken)
-	req.Header.Set(idempotencyHeader, uuid.New().String())
-
-	if cfg.CorporationID != "" {
-		req.Header.Set(corporationIDHeader, cfg.CorporationID)
-	}
-	if cfg.IntegratorID != "" {
-		req.Header.Set(integratorIDHeader, cfg.IntegratorID)
-	}
-	if cfg.PlatformID != "" {
-		req.Header.Set(platformIDHeader, cfg.PlatformID)
-	}
-
-	return send(ctx, cfg.Requester, req)
-}
-
-func send(_ context.Context, requester requester.Requester, req *http.Request) ([]byte, error) {
+func send[T any](requester requester.Requester, req *http.Request) (*T, error) {
 	res, err := requester.Do(req)
 	if err != nil {
 		return nil, fmt.Errorf("transport level error: %w", err)
@@ -84,5 +34,14 @@ func send(_ context.Context, requester requester.Requester, req *http.Request) (
 		}
 	}
 
+	return makeResponse[T](response)
+}
+
+func makeResponse[T any](b []byte) (*T, error) {
+	var response *T
+	if err := json.Unmarshal(b, &response); err != nil {
+		return nil, err
+	}
+
 	return response, nil
 }

pkg/paymentmethod/client.go

@@ -2,15 +2,12 @@ package paymentmethod
 
 import (
 	"context"
-	"encoding/json"
-	"fmt"
-	"net/http"
 
 	"github.com/mercadopago/sdk-go/pkg/config"
 	"github.com/mercadopago/sdk-go/pkg/internal/httpclient"
 )
 
-const url = "https://api.mercadopago.com/v1/payment_methods"
+const path = "/v1/payment_methods"
 
 // Client contains the methods to interact with the Payment Methods API.
 type Client interface {
@@ -22,31 +19,19 @@ type Client interface {
 
 // client is the implementation of Client.
 type client struct {
-	config *config.Config
+	cfg *config.Config
 }
 
 // NewClient returns a new Payment Methods API Client.
-func NewClient(c *config.Config) Client {
-	return &client{
-		config: c,
-	}
+func NewClient(cfg *config.Config) Client {
+	return &client{cfg}
 }
 
 func (c *client) List(ctx context.Context) ([]Response, error) {
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
-	if err != nil {
-		return nil, fmt.Errorf("error creating request: %w", err)
-	}
-
-	res, err := httpclient.Send(ctx, c.config, req)
+	res, err := httpclient.Get[[]Response](ctx, c.cfg, path)
 	if err != nil {
 		return nil, err
 	}
 
-	var formatted []Response
-	if err := json.Unmarshal(res, &formatted); err != nil {
-		return nil, err
-	}
-
-	return formatted, nil
+	return *res, nil
 }

pkg/paymentmethod/payment_method_test.go → pkg/paymentmethod/client_test.go

@@ -123,15 +123,13 @@ func TestList(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			c := &client{
-				config: tt.fields.config,
-			}
+			c := &client{tt.fields.config}
 			got, err := c.List(tt.args.ctx)
 			gotErr := ""
 			if err != nil {
 				gotErr = err.Error()
 			}
-
+			
 			if gotErr != tt.wantErr {
 				t.Errorf("client.List() error = %v, wantErr %v", err, tt.wantErr)
 			}

test/integration/payment_method_test.go

@@ -11,13 +11,13 @@ import (
 
 func TestPaymentMethod(t *testing.T) {
 	t.Run("should_list_payment_methods", func(t *testing.T) {
-		c, err := config.New(os.Getenv("at"))
+		cfg, err := config.New(os.Getenv("at"))
 		if err != nil {
 			t.Fatal(err)
 		}
 
-		pmc := paymentmethod.NewClient(c)
-		res, err := pmc.List(context.Background())
+		client := paymentmethod.NewClient(cfg)
+		res, err := client.List(context.Background())
 
 		if res == nil {
 			t.Error("res can't be nil")