feat: 添加了social的关注功能

internal/social/service.go

@@ -0,0 +1,82 @@
+package social
+
+import (
+	"context"
+	"errors"
+	"feedsystem_video_go/internal/account"
+)
+
+type SocialService struct {
+	repo        *SocialRepository
+	accountrepo *account.AccountRepository
+}
+
+func NewSocialService(repo *SocialRepository, accountrepo *account.AccountRepository) *SocialService {
+	return &SocialService{repo: repo, accountrepo: accountrepo}
+}
+
+func (s *SocialService) Follow(ctx context.Context, social *Social) error {
+	_, err := s.accountrepo.FindByID(ctx, social.FollowerID)
+	if err != nil {
+		return err
+	}
+	_, err = s.accountrepo.FindByID(ctx, social.VloggerID)
+	if err != nil {
+		return err
+	}
+	isFollowed, err := s.repo.IsFollowed(ctx, social)
+	if err != nil {
+		return err
+	}
+	if isFollowed {
+		return errors.New("already followed")
+	}
+	return s.repo.Follow(ctx, social)
+}
+
+func (s *SocialService) Unfollow(ctx context.Context, social *Social) error {
+	_, err := s.accountrepo.FindByID(ctx, social.FollowerID)
+	if err != nil {
+		return err
+	}
+	_, err = s.accountrepo.FindByID(ctx, social.VloggerID)
+	if err != nil {
+		return err
+	}
+	isFollowed, err := s.repo.IsFollowed(ctx, social)
+	if err != nil {
+		return err
+	}
+	if !isFollowed {
+		return errors.New("not followed")
+	}
+	return s.repo.Unfollow(ctx, social)
+}
+
+func (s *SocialService) GetAllFollowers(ctx context.Context, VloggerID uint) ([]*account.Account, error) {
+	_, err := s.accountrepo.FindByID(ctx, VloggerID)
+	if err != nil {
+		return nil, err
+	}
+	return s.repo.GetAllFollowers(ctx, VloggerID)
+}
+
+func (s *SocialService) GetAllVloggers(ctx context.Context, FollowerID uint) ([]*account.Account, error) {
+	_, err := s.accountrepo.FindByID(ctx, FollowerID)
+	if err != nil {
+		return nil, err
+	}
+	return s.repo.GetAllVloggers(ctx, FollowerID)
+}
+
+func (s *SocialService) IsFollowed(ctx context.Context, social *Social) (bool, error) {
+	_, err := s.accountrepo.FindByID(ctx, social.FollowerID)
+	if err != nil {
+		return false, err
+	}
+	_, err = s.accountrepo.FindByID(ctx, social.VloggerID)
+	if err != nil {
+		return false, err
+	}
+	return s.repo.IsFollowed(ctx, social)
+}