feat: added API gateway

internal/gw/grpc_client/user_client.go

@@ -0,0 +1,79 @@
+package grpc_client
+
+import (
+	"context"
+	"fmt"
+
+	pb "datarush/pkg/api/user"
+
+	"google.golang.org/grpc"
+)
+
+type UserClient struct {
+	client pb.UserServiceClient
+	conn   *grpc.ClientConn
+}
+
+func NewUserClient(ctx context.Context, address string, factory *ClientFactory) (*UserClient, error) {
+	conn, err := factory.GetConnection(ctx, address)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create user client: %w", err)
+	}
+
+	return &UserClient{
+		client: pb.NewUserServiceClient(conn),
+		conn:   conn,
+	}, nil
+}
+
+func (c *UserClient) GetProfile(ctx context.Context, userID string) (*pb.User, error) {
+	req := &pb.GetProfileRequest{
+		UserId: userID,
+	}
+
+	resp, err := c.client.GetProfile(ctx, req)
+	if err != nil {
+		return nil, fmt.Errorf("get profile failed: %w", err)
+	}
+
+	return resp, nil
+}
+
+func (c *UserClient) RegisterForCompetition(ctx context.Context, competitionID string) error {
+	req := &pb.RegisterForCompetitionRequest{
+		CompetitionId: competitionID,
+	}
+
+	_, err := c.client.RegisterForCompetition(ctx, req)
+	if err != nil {
+		return fmt.Errorf("register for competition failed: %w", err)
+	}
+
+	return nil
+}
+
+func (c *UserClient) UnregisterFromCompetition(ctx context.Context, competitionID string) error {
+	req := &pb.UnregisterFromCompetitionRequest{
+		CompetitionId: competitionID,
+	}
+
+	_, err := c.client.UnregisterFromCompetition(ctx, req)
+	if err != nil {
+		return fmt.Errorf("unregister from competition failed: %w", err)
+	}
+
+	return nil
+}
+
+func (c *UserClient) ListUserCompetitions(ctx context.Context, userID string) ([]string, error) {
+	req := &pb.ListUserCompetitionsRequest{
+		UserId: userID,
+	}
+
+	resp, err := c.client.ListUserCompetitions(ctx, req)
+	if err != nil {
+		return nil, fmt.Errorf("list user competitions failed: %w", err)
+	}
+
+	return resp.CompetitionIds, nil
+}