feat: added API gateway

internal/gw/grpc_client/achievements_client.go

@@ -0,0 +1,49 @@
+package grpc_client
+
+import (
+	"context"
+	"fmt"
+
+	"google.golang.org/grpc"
+
+	pb "datarush/pkg/api/achievements"
+)
+
+type AchievementsClient struct {
+	client pb.AchievementsServiceClient
+	conn   *grpc.ClientConn
+}
+
+func NewAchievementsClient(ctx context.Context, address string, factory *ClientFactory) (*AchievementsClient, error) {
+	conn, err := factory.GetConnection(ctx, address)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create achievements client: %w", err)
+	}
+	return &AchievementsClient{client: pb.NewAchievementsServiceClient(conn), conn: conn}, nil
+}
+
+func (c *AchievementsClient) GetAchievement(ctx context.Context, achievementID string) (*pb.Achievement, error) {
+	req := &pb.GetAchievementRequest{Id: achievementID}
+	resp, err := c.client.GetAchievement(ctx, req)
+	if err != nil {
+		return nil, fmt.Errorf("get achievement failed: %w", err)
+	}
+	return resp, nil
+}
+
+func (c *AchievementsClient) ListAchievements(ctx context.Context) ([]*pb.Achievement, error) {
+	resp, err := c.client.ListAchievements(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("list achievements failed: %w", err)
+	}
+	return resp.Achievements, nil
+}
+
+func (c *AchievementsClient) GetUserAchievements(ctx context.Context, userID string) ([]*pb.AchievementUser, error) {
+	req := &pb.GetUserAchievementsRequest{UserId: userID}
+	resp, err := c.client.GetUserAchievements(ctx, req)
+	if err != nil {
+		return nil, fmt.Errorf("get user achievements failed: %w", err)
+	}
+	return resp.UserAchievements, nil
+}