generate/database/neo4j/relaction.cypher

@@ -2,4 +2,4 @@
 CREATE DATABASE relation;
 
 // 創建 User 節點 UID 是唯一鍵
-CREATE CONSTRAINT FOR (u:User) REQUIRE u.UID IS UNIQUE
+CREATE CONSTRAINT FOR (u:User) REQUIRE u.uid IS UNIQUE

generate/protobuf/tweeting.proto

@@ -251,7 +251,48 @@ message AddUserToNetworkReq
   string uid = 1;
 }
 
+message DoFollowerRelationReq
+{
+  string follower_uid = 1;
+  string followee_uid = 2;
+}
+
+message FollowReq
+{
+  string uid = 1;
+  int64 page_size = 2;
+  int64 page_index = 3;
+}
+
+message FollowResp
+{
+  repeated string uid = 1;
+  Pager page = 2;
+}
+
+message FollowCountReq
+{
+  string uid = 1;
+}
+
+message FollowCountResp
+{
+  string uid = 1;
+  int64 total = 2;
+}
+
 service SocialNetworkService
 {
-  rpc AddUserToNetwork(AddUserToNetworkReq) returns (OKResp);
+  // MarkFollowRelation 關注
+  rpc MarkFollowRelation(DoFollowerRelationReq) returns (OKResp);
+  // RemoveFollowRelation 取消關注
+  rpc RemoveFollowRelation(DoFollowerRelationReq) returns (OKResp);
+  // GetFollower 取得跟隨者名單
+  rpc GetFollower(FollowReq) returns (FollowResp);
+  // GetFollowee 取得我跟隨的名單
+  rpc GetFollowee(FollowReq) returns (FollowResp);
+  // GetFollowerCount 取得跟隨者數量
+  rpc GetFollowerCount(FollowCountReq) returns (FollowCountResp);
+  // GetFolloweeCount 取得我跟隨的數量
+  rpc GetFolloweeCount(FollowCountReq) returns (FollowCountResp);
 }

internal/domain/errors.go

@@ -41,6 +41,15 @@ const (
 	SetNoMoreDataErrorCode
 )
 
+const (
+	MarkRelationErrorCode ErrorCode = iota + 30
+	GetFollowerErrorCode
+	GetFollowerCountErrorCode
+	GetFolloweeErrorCode
+	GetFolloweeCountErrorCode
+	RemoveRelationErrorCode
+)
+
 func CommentError(ec ErrorCode, s ...string) *ers.LibError {
 	return ers.NewError(code.CloudEPTweeting, code.DBError,
 		ec.ToUint32(),

internal/domain/repository/social_network.go

@@ -4,4 +4,23 @@ import "context"
 
 type SocialNetworkRepository interface {
 	CreateUserNode(ctx context.Context, uid string) error
+	MarkFollowerRelation(ctx context.Context, fromUID, toUID string) error
+	RemoveFollowerRelation(ctx context.Context, fromUID, toUID string) error
+	GetFollower(ctx context.Context, req FollowReq) (FollowResp, error)
+	GetFollowee(ctx context.Context, req FollowReq) (FollowResp, error)
+	GetFollowerCount(ctx context.Context, uid string) (int64, error)
+	GetFolloweeCount(ctx context.Context, uid string) (int64, error)
+	GetDegreeBetweenUsers(ctx context.Context, uid1, uid2 string) (int64, error)
+	GetUIDsWithinNDegrees(ctx context.Context, uid string, degrees, pageSize, pageIndex int64) ([]string, int64, error)
+}
+
+type FollowReq struct {
+	UID       string
+	PageSize  int64
+	PageIndex int64
+}
+
+type FollowResp struct {
+	UIDs  []string
+	Total int64
 }

internal/logic/socialnetworkservice/add_user_to_network_logic.go

@@ -1,37 +0,0 @@
-package socialnetworkservicelogic
-
-import (
-	"context"
-	"fmt"
-
-	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
-	"app-cloudep-tweeting-service/internal/svc"
-
-	"github.com/zeromicro/go-zero/core/logx"
-)
-
-type AddUserToNetworkLogic struct {
-	ctx    context.Context
-	svcCtx *svc.ServiceContext
-	logx.Logger
-}
-
-func NewAddUserToNetworkLogic(ctx context.Context, svcCtx *svc.ServiceContext) *AddUserToNetworkLogic {
-	return &AddUserToNetworkLogic{
-		ctx:    ctx,
-		svcCtx: svcCtx,
-		Logger: logx.WithContext(ctx),
-	}
-}
-
-func (l *AddUserToNetworkLogic) AddUserToNetwork(in *tweeting.AddUserToNetworkReq) (*tweeting.OKResp, error) {
-	// todo: add your logic here and delete this line
-	err := l.svcCtx.SocialNetworkRepository.CreateUserNode(l.ctx, in.GetUid())
-	if err != nil {
-		fmt.Println("gg88g88g8", err)
-		return nil, err
-	}
-	fmt.Println(err)
-
-	return &tweeting.OKResp{}, nil
-}

internal/logic/socialnetworkservice/get_followee_count_logic.go

@@ -0,0 +1,58 @@
+package socialnetworkservicelogic
+
+import (
+	"app-cloudep-tweeting-service/internal/domain"
+	ers "code.30cm.net/digimon/library-go/errs"
+	"context"
+
+	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
+	"app-cloudep-tweeting-service/internal/svc"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type GetFolloweeCountLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewGetFolloweeCountLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetFolloweeCountLogic {
+	return &GetFolloweeCountLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+// GetFolloweeCount 取得我跟隨的數量
+func (l *GetFolloweeCountLogic) GetFolloweeCount(in *tweeting.FollowCountReq) (*tweeting.FollowCountResp, error) {
+	// 驗證資料
+	if err := l.svcCtx.Validate.ValidateAll(&getFollowCountReq{
+		UID: in.Uid,
+	}); err != nil {
+		// 錯誤代碼 05-011-00
+		return nil, ers.InvalidFormat(err.Error())
+	}
+
+	followeeCount, err := l.svcCtx.SocialNetworkRepository.GetFolloweeCount(l.ctx, in.GetUid())
+	if err != nil {
+		// 錯誤代碼 05-021-34
+		e := domain.CommentErrorL(
+			domain.GetFolloweeCountErrorCode,
+			logx.WithContext(l.ctx),
+			[]logx.LogField{
+				{Key: "req", Value: in},
+				{Key: "func", Value: "SocialNetworkRepository.GetFolloweeCount"},
+				{Key: "err", Value: err},
+			},
+			"failed to count follower").Wrap(err)
+
+		return nil, e
+	}
+
+	return &tweeting.FollowCountResp{
+		Uid:   in.GetUid(),
+		Total: followeeCount,
+	}, nil
+}

internal/logic/socialnetworkservice/get_followee_logic.go

@@ -0,0 +1,69 @@
+package socialnetworkservicelogic
+
+import (
+	"app-cloudep-tweeting-service/internal/domain"
+	"app-cloudep-tweeting-service/internal/domain/repository"
+	ers "code.30cm.net/digimon/library-go/errs"
+	"context"
+
+	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
+	"app-cloudep-tweeting-service/internal/svc"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type GetFolloweeLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewGetFolloweeLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetFolloweeLogic {
+	return &GetFolloweeLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+// GetFollowee 取得我跟隨的名單
+func (l *GetFolloweeLogic) GetFollowee(in *tweeting.FollowReq) (*tweeting.FollowResp, error) {
+	// 驗證資料
+	if err := l.svcCtx.Validate.ValidateAll(&getFollowReq{
+		UID:       in.Uid,
+		PageSize:  in.PageSize,
+		PageIndex: in.PageIndex,
+	}); err != nil {
+		// 錯誤代碼 05-011-00
+		return nil, ers.InvalidFormat(err.Error())
+	}
+
+	followee, err := l.svcCtx.SocialNetworkRepository.GetFollowee(l.ctx, repository.FollowReq{
+		UID:       in.GetUid(),
+		PageIndex: in.GetPageIndex(),
+		PageSize:  in.GetPageSize(),
+	})
+	if err != nil {
+		// 錯誤代碼 05-021-33
+		e := domain.CommentErrorL(
+			domain.GetFolloweeErrorCode,
+			logx.WithContext(l.ctx),
+			[]logx.LogField{
+				{Key: "req", Value: in},
+				{Key: "func", Value: "SocialNetworkRepository.GetFollowee"},
+				{Key: "err", Value: err},
+			},
+			"failed to get relation: ", in.GetUid()).Wrap(err)
+
+		return nil, e
+	}
+
+	return &tweeting.FollowResp{
+		Uid: followee.UIDs,
+		Page: &tweeting.Pager{
+			Total: followee.Total,
+			Index: in.GetPageIndex(),
+			Size:  in.GetPageSize(),
+		},
+	}, nil
+}

internal/logic/socialnetworkservice/get_follower_count_logic.go

@@ -0,0 +1,62 @@
+package socialnetworkservicelogic
+
+import (
+	"app-cloudep-tweeting-service/internal/domain"
+	ers "code.30cm.net/digimon/library-go/errs"
+	"context"
+
+	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
+	"app-cloudep-tweeting-service/internal/svc"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type GetFollowerCountLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewGetFollowerCountLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetFollowerCountLogic {
+	return &GetFollowerCountLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+type getFollowCountReq struct {
+	UID string `validate:"required"`
+}
+
+// GetFollowerCount 取得跟隨者數量
+func (l *GetFollowerCountLogic) GetFollowerCount(in *tweeting.FollowCountReq) (*tweeting.FollowCountResp, error) {
+	// 驗證資料
+	if err := l.svcCtx.Validate.ValidateAll(&getFollowCountReq{
+		UID: in.Uid,
+	}); err != nil {
+		// 錯誤代碼 05-011-00
+		return nil, ers.InvalidFormat(err.Error())
+	}
+
+	followerCount, err := l.svcCtx.SocialNetworkRepository.GetFollowerCount(l.ctx, in.GetUid())
+	if err != nil {
+		// 錯誤代碼 05-021-32
+		e := domain.CommentErrorL(
+			domain.GetFollowerCountErrorCode,
+			logx.WithContext(l.ctx),
+			[]logx.LogField{
+				{Key: "req", Value: in},
+				{Key: "func", Value: "SocialNetworkRepository.GetFollowerCount"},
+				{Key: "err", Value: err},
+			},
+			"failed to count follower").Wrap(err)
+
+		return nil, e
+	}
+
+	return &tweeting.FollowCountResp{
+		Uid:   in.GetUid(),
+		Total: followerCount,
+	}, nil
+}

internal/logic/socialnetworkservice/get_follower_logic.go

@@ -0,0 +1,75 @@
+package socialnetworkservicelogic
+
+import (
+	"app-cloudep-tweeting-service/internal/domain"
+	"app-cloudep-tweeting-service/internal/domain/repository"
+	ers "code.30cm.net/digimon/library-go/errs"
+	"context"
+
+	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
+	"app-cloudep-tweeting-service/internal/svc"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type GetFollowerLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewGetFollowerLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetFollowerLogic {
+	return &GetFollowerLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+type getFollowReq struct {
+	UID       string `validate:"required"`
+	PageSize  int64  `validate:"required"`
+	PageIndex int64  `validate:"required"`
+}
+
+// GetFollower 取得跟隨者名單
+func (l *GetFollowerLogic) GetFollower(in *tweeting.FollowReq) (*tweeting.FollowResp, error) {
+	// 驗證資料
+	if err := l.svcCtx.Validate.ValidateAll(&getFollowReq{
+		UID:       in.Uid,
+		PageSize:  in.PageSize,
+		PageIndex: in.PageIndex,
+	}); err != nil {
+		// 錯誤代碼 05-011-00
+		return nil, ers.InvalidFormat(err.Error())
+	}
+
+	follower, err := l.svcCtx.SocialNetworkRepository.GetFollower(l.ctx, repository.FollowReq{
+		UID:       in.GetUid(),
+		PageIndex: in.GetPageIndex(),
+		PageSize:  in.GetPageSize(),
+	})
+	if err != nil {
+		// 錯誤代碼 05-021-31
+		e := domain.CommentErrorL(
+			domain.GetFollowerErrorCode,
+			logx.WithContext(l.ctx),
+			[]logx.LogField{
+				{Key: "req", Value: in},
+				{Key: "func", Value: "SocialNetworkRepository.GetFollower"},
+				{Key: "err", Value: err},
+			},
+			"failed to get relation: ", in.GetUid()).Wrap(err)
+
+		return nil, e
+	}
+
+	return &tweeting.FollowResp{
+		Uid: follower.UIDs,
+		Page: &tweeting.Pager{
+			Total: follower.Total,
+			Index: in.GetPageIndex(),
+			Size:  in.GetPageSize(),
+		},
+	}, nil
+}

internal/logic/socialnetworkservice/mark_follow_relation_logic.go

@@ -0,0 +1,62 @@
+package socialnetworkservicelogic
+
+import (
+	"app-cloudep-tweeting-service/internal/domain"
+	ers "code.30cm.net/digimon/library-go/errs"
+	"context"
+
+	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
+	"app-cloudep-tweeting-service/internal/svc"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type MarkFollowRelationLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewMarkFollowRelationLogic(ctx context.Context, svcCtx *svc.ServiceContext) *MarkFollowRelationLogic {
+	return &MarkFollowRelationLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+type doFollowReq struct {
+	FollowerUID string `json:"follower_uid" validate:"required"` // 追隨者，跟隨你的人（別人關注你）
+	FolloweeUID string `json:"followee_uid" validate:"required"` // 追蹤者，你跟隨的人（你關注別）
+}
+
+// MarkFollowRelation 關注
+func (l *MarkFollowRelationLogic) MarkFollowRelation(in *tweeting.DoFollowerRelationReq) (*tweeting.OKResp, error) {
+	// 驗證資料
+	if err := l.svcCtx.Validate.ValidateAll(&doFollowReq{
+		FollowerUID: in.GetFollowerUid(),
+		FolloweeUID: in.GetFolloweeUid(),
+	}); err != nil {
+		// 錯誤代碼 05-011-00
+		return nil, ers.InvalidFormat(err.Error())
+	}
+
+	// 這裡要幫建立關係， follower 追蹤 -> followee
+	err := l.svcCtx.SocialNetworkRepository.MarkFollowerRelation(l.ctx, in.GetFollowerUid(), in.GetFolloweeUid())
+	if err != nil {
+		// 錯誤代碼 05-021-30
+		e := domain.CommentErrorL(
+			domain.MarkRelationErrorCode,
+			logx.WithContext(l.ctx),
+			[]logx.LogField{
+				{Key: "req", Value: in},
+				{Key: "func", Value: "SocialNetworkRepository.MarkFollowerRelationBetweenUsers"},
+				{Key: "err", Value: err},
+			},
+			"failed to mark relation form -> to", in.GetFollowerUid(), in.GetFolloweeUid()).Wrap(err)
+
+		return nil, e
+	}
+
+	return &tweeting.OKResp{}, nil
+}

internal/logic/socialnetworkservice/remove_follow_relation_logic.go

@@ -0,0 +1,57 @@
+package socialnetworkservicelogic
+
+import (
+	"app-cloudep-tweeting-service/internal/domain"
+	ers "code.30cm.net/digimon/library-go/errs"
+	"context"
+
+	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
+	"app-cloudep-tweeting-service/internal/svc"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type RemoveFollowRelationLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewRemoveFollowRelationLogic(ctx context.Context, svcCtx *svc.ServiceContext) *RemoveFollowRelationLogic {
+	return &RemoveFollowRelationLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+// RemoveFollowRelation 取消關注
+func (l *RemoveFollowRelationLogic) RemoveFollowRelation(in *tweeting.DoFollowerRelationReq) (*tweeting.OKResp, error) {
+	// 驗證資料
+	if err := l.svcCtx.Validate.ValidateAll(&doFollowReq{
+		FollowerUID: in.GetFollowerUid(),
+		FolloweeUID: in.GetFolloweeUid(),
+	}); err != nil {
+		// 錯誤代碼 05-011-00
+		return nil, ers.InvalidFormat(err.Error())
+	}
+
+	// 這裡要幫刪除關係， follower 追蹤 -> followee
+	err := l.svcCtx.SocialNetworkRepository.RemoveFollowerRelation(l.ctx, in.GetFollowerUid(), in.GetFolloweeUid())
+	if err != nil {
+		// 錯誤代碼 05-021-35
+		e := domain.CommentErrorL(
+			domain.RemoveRelationErrorCode,
+			logx.WithContext(l.ctx),
+			[]logx.LogField{
+				{Key: "req", Value: in},
+				{Key: "func", Value: "SocialNetworkRepository.RemoveFollowerRelation"},
+				{Key: "err", Value: err},
+			},
+			"failed to remove relation form -> to", in.GetFollowerUid(), in.GetFolloweeUid()).Wrap(err)
+
+		return nil, e
+	}
+
+	return &tweeting.OKResp{}, nil
+}

internal/repository/social_network.go

@@ -5,6 +5,7 @@ import (
 	"app-cloudep-tweeting-service/internal/domain/repository"
 	client4J "app-cloudep-tweeting-service/internal/lib/neo4j"
 	"context"
+	"fmt"
 	"github.com/neo4j/neo4j-go-driver/v5/neo4j"
 )
 
@@ -25,7 +26,7 @@ func MustSocialNetworkRepository(param SocialNetworkParam) repository.SocialNetw
 	}
 }
 
-func (s SocialNetworkRepository) CreateUserNode(ctx context.Context, uid string) error {
+func (s *SocialNetworkRepository) CreateUserNode(ctx context.Context, uid string) error {
 	session, err := s.neo4jClient.Conn()
 	if err != nil {
 		return err
@@ -36,18 +37,356 @@ func (s SocialNetworkRepository) CreateUserNode(ctx context.Context, uid string)
 		"uid": uid,
 	}
 
-	_, err = session.NewSession(ctx, neo4j.SessionConfig{
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
 		AccessMode: neo4j.AccessModeWrite,
 	}).Run(ctx, "CREATE (n:User {uid: $uid}) RETURN n", params)
 	if err != nil {
 		return err
 	}
 
-	// // 處理結果
+	// 處理結果
-	// if run.Next(ctx) {
+	if run.Next(ctx) {
-	// 	node := run.Record().AsMap()
+		_ = run.Record().AsMap()
-	// 	fmt.Printf("Created Node: %v\n", node)
+	}
-	// }
 
 	return nil
 }
+
+func (s *SocialNetworkRepository) MarkFollowerRelation(ctx context.Context, fromUID, toUID string) error {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"fromUID": fromUID,
+		"toUID":   toUID,
+	}
+
+	// 這是有向的關係  form -> to
+	query := `
+		MERGE (from:User {uid: $fromUID})
+		MERGE (to:User {uid: $toUID})
+		MERGE (from)-[:FRIENDS_WITH]->(to)
+		RETURN from, to
+	`
+
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeWrite,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return err
+	}
+
+	// 處理結果
+	if run.Next(ctx) {
+		_ = run.Record().AsMap()
+	}
+
+	return nil
+}
+
+func (s *SocialNetworkRepository) GetFollower(ctx context.Context, req repository.FollowReq) (repository.FollowResp, error) {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return repository.FollowResp{}, err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"uid":   req.UID,
+		"skip":  (req.PageIndex - 1) * req.PageSize,
+		"limit": req.PageSize,
+	}
+
+	query := `
+		MATCH (follower:User)-[:FRIENDS_WITH]->(user:User {uid: $uid})
+		RETURN follower.uid AS uid
+		SKIP $skip LIMIT $limit
+	`
+
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeRead,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return repository.FollowResp{}, err
+	}
+
+	var uids []string
+	for run.Next(ctx) {
+		record := run.Record()
+		if uid, ok := record.Get("uid"); ok {
+			uids = append(uids, uid.(string))
+		}
+	}
+
+	total, err := s.GetFollowerCount(ctx, req.UID)
+	if err != nil {
+		return repository.FollowResp{}, err
+	}
+
+	return repository.FollowResp{
+		UIDs:  uids,
+		Total: total,
+	}, nil
+}
+
+func (s *SocialNetworkRepository) GetFollowee(ctx context.Context, req repository.FollowReq) (repository.FollowResp, error) {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return repository.FollowResp{}, err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"uid":   req.UID,
+		"skip":  (req.PageIndex - 1) * req.PageSize,
+		"limit": req.PageSize,
+	}
+
+	query := `
+		MATCH (user:User {uid: $uid})-[:FRIENDS_WITH]->(followee:User)
+		RETURN followee.uid AS uid
+		SKIP $skip LIMIT $limit
+	`
+
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeRead,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return repository.FollowResp{}, err
+	}
+
+	var uids []string
+	for run.Next(ctx) {
+		record := run.Record()
+		if uid, ok := record.Get("uid"); ok {
+			uids = append(uids, uid.(string))
+		}
+	}
+
+	total, err := s.GetFolloweeCount(ctx, req.UID)
+	if err != nil {
+		return repository.FollowResp{}, err
+	}
+
+	return repository.FollowResp{
+		UIDs:  uids,
+		Total: total,
+	}, nil
+}
+
+func (s *SocialNetworkRepository) GetFollowerCount(ctx context.Context, uid string) (int64, error) {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return 0, err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"uid": uid,
+	}
+
+	query := `
+		MATCH (:User)-[:FRIENDS_WITH]->(user:User {uid: $uid})
+		RETURN count(*) AS followerCount
+	`
+
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeRead,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return 0, err
+	}
+
+	var count int64
+	if run.Next(ctx) {
+		record := run.Record()
+		if followerCount, ok := record.Get("followerCount"); ok {
+			count = followerCount.(int64)
+		}
+	}
+
+	return count, nil
+}
+
+func (s *SocialNetworkRepository) GetFolloweeCount(ctx context.Context, uid string) (int64, error) {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return 0, err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"uid": uid,
+	}
+
+	query := `
+		MATCH (user:User {uid: $uid})-[:FRIENDS_WITH]->(:User)
+		RETURN count(*) AS followeeCount
+	`
+
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeRead,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return 0, err
+	}
+
+	var count int64
+	if run.Next(ctx) {
+		record := run.Record()
+		if followeeCount, ok := record.Get("followeeCount"); ok {
+			count = followeeCount.(int64)
+		}
+	}
+
+	return count, nil
+}
+
+func (s *SocialNetworkRepository) RemoveFollowerRelation(ctx context.Context, fromUID, toUID string) error {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"fromUID": fromUID,
+		"toUID":   toUID,
+	}
+
+	query := `
+		MATCH (from:User {uid: $fromUID})-[r:FRIENDS_WITH]->(to:User {uid: $toUID})
+		DELETE r
+	`
+
+	_, err = session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeWrite,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return fmt.Errorf("failed to remove follower relation: %w", err)
+	}
+
+	return nil
+}
+
+// GetDegreeBetweenUsers 取得這兩個點之間的度數 （最短路徑長度）
+func (s *SocialNetworkRepository) GetDegreeBetweenUsers(ctx context.Context, uid1, uid2 string) (int64, error) {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return 0, err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"uid1": uid1,
+		"uid2": uid2,
+	}
+
+	query := `
+		MATCH (user1:User {uid: $uid1}), (user2:User {uid: $uid2})
+		MATCH p = shortestPath((user1)-[*]-(user2))
+		RETURN length(p) AS degree
+	`
+
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeRead,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return 0, fmt.Errorf("failed to get degree between users: %w", err)
+	}
+
+	var degree int64
+	if run.Next(ctx) {
+		record := run.Record()
+		if deg, ok := record.Get("degree"); ok {
+			degree = deg.(int64)
+		}
+	}
+
+	return degree, nil
+}
+
+// GetUIDsWithinNDegrees 取得某個節點在 n 度內關係所有 UID
+func (s *SocialNetworkRepository) GetUIDsWithinNDegrees(ctx context.Context, uid string, degrees, pageSize, pageIndex int64) ([]string, int64, error) {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return nil, 0, err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"uid":     uid,
+		"degrees": degrees,
+		"skip":    (pageIndex - 1) * pageSize,
+		"limit":   pageSize,
+	}
+
+	// 查詢結果帶分頁
+	query := `
+		MATCH (user:User {uid: $uid})-[:FRIENDS_WITH*1..$degrees]-(related:User)
+		WITH DISTINCT related.uid AS uid
+		SKIP $skip LIMIT $limit
+		RETURN uid
+	`
+
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeRead,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return nil, 0, fmt.Errorf("failed to get uids within %d degrees of user: %w", degrees, err)
+	}
+
+	var uids []string
+	for run.Next(ctx) {
+		record := run.Record()
+		if uid, ok := record.Get("uid"); ok {
+			uids = append(uids, uid.(string))
+		}
+	}
+
+	// 計算總數
+	totalCount, err := s.getTotalUIDsWithinNDegrees(ctx, uid, degrees)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	return uids, totalCount, nil
+}
+
+func (s *SocialNetworkRepository) getTotalUIDsWithinNDegrees(ctx context.Context, uid string, degrees int64) (int64, error) {
+	session, err := s.neo4jClient.Conn()
+	if err != nil {
+		return 0, err
+	}
+	defer session.Close(ctx)
+
+	params := map[string]interface{}{
+		"uid":     uid,
+		"degrees": degrees,
+	}
+
+	query := `
+		MATCH (user:User {uid: $uid})-[:FRIENDS_WITH*1..$degrees]-(related:User)
+		RETURN count(DISTINCT related.uid) AS totalCount
+	`
+
+	run, err := session.NewSession(ctx, neo4j.SessionConfig{
+		AccessMode: neo4j.AccessModeRead,
+	}).Run(ctx, query, params)
+	if err != nil {
+		return 0, fmt.Errorf("failed to get total uids within %d degrees of user: %w", degrees, err)
+	}
+
+	var totalCount int64
+	if run.Next(ctx) {
+		record := run.Record()
+		if count, ok := record.Get("totalCount"); ok {
+			totalCount = count.(int64)
+		}
+	}
+
+	return totalCount, nil
+}

internal/server/socialnetworkservice/social_network_service_server.go

@@ -22,7 +22,38 @@ func NewSocialNetworkServiceServer(svcCtx *svc.ServiceContext) *SocialNetworkSer
 	}
 }
 
-func (s *SocialNetworkServiceServer) AddUserToNetwork(ctx context.Context, in *tweeting.AddUserToNetworkReq) (*tweeting.OKResp, error) {
+// MarkFollowRelation 關注
-	l := socialnetworkservicelogic.NewAddUserToNetworkLogic(ctx, s.svcCtx)
+func (s *SocialNetworkServiceServer) MarkFollowRelation(ctx context.Context, in *tweeting.DoFollowerRelationReq) (*tweeting.OKResp, error) {
-	return l.AddUserToNetwork(in)
+	l := socialnetworkservicelogic.NewMarkFollowRelationLogic(ctx, s.svcCtx)
+	return l.MarkFollowRelation(in)
+}
+
+// RemoveFollowRelation 取消關注
+func (s *SocialNetworkServiceServer) RemoveFollowRelation(ctx context.Context, in *tweeting.DoFollowerRelationReq) (*tweeting.OKResp, error) {
+	l := socialnetworkservicelogic.NewRemoveFollowRelationLogic(ctx, s.svcCtx)
+	return l.RemoveFollowRelation(in)
+}
+
+// GetFollower 取得跟隨者名單
+func (s *SocialNetworkServiceServer) GetFollower(ctx context.Context, in *tweeting.FollowReq) (*tweeting.FollowResp, error) {
+	l := socialnetworkservicelogic.NewGetFollowerLogic(ctx, s.svcCtx)
+	return l.GetFollower(in)
+}
+
+// GetFollowee 取得我跟隨的名單
+func (s *SocialNetworkServiceServer) GetFollowee(ctx context.Context, in *tweeting.FollowReq) (*tweeting.FollowResp, error) {
+	l := socialnetworkservicelogic.NewGetFolloweeLogic(ctx, s.svcCtx)
+	return l.GetFollowee(in)
+}
+
+// GetFollowerCount 取得跟隨者數量
+func (s *SocialNetworkServiceServer) GetFollowerCount(ctx context.Context, in *tweeting.FollowCountReq) (*tweeting.FollowCountResp, error) {
+	l := socialnetworkservicelogic.NewGetFollowerCountLogic(ctx, s.svcCtx)
+	return l.GetFollowerCount(in)
+}
+
+// GetFolloweeCount 取得我跟隨的數量
+func (s *SocialNetworkServiceServer) GetFolloweeCount(ctx context.Context, in *tweeting.FollowCountReq) (*tweeting.FollowCountResp, error) {
+	l := socialnetworkservicelogic.NewGetFolloweeCountLogic(ctx, s.svcCtx)
+	return l.GetFolloweeCount(in)
 }