Golang util.FormatUserKey函數代碼示例

func (ts *tribServer) AddSubscription(args *tribrpc.SubscriptionArgs, reply *tribrpc.SubscriptionReply) error {
	userkey := util.FormatUserKey(args.UserID)
	targetkey := util.FormatUserKey(args.TargetUserID)

	usersubs := util.FormatSubListKey(args.UserID)
	target := args.TargetUserID

	// Make sure user exists
	if _, eu := ts.ls.Get(userkey); eu != nil {
		reply.Status = tribrpc.NoSuchUser
		return nil
	}
	// Make sure targetUser exists
	if _, et := ts.ls.Get(targetkey); et != nil {
		reply.Status = tribrpc.NoSuchTargetUser
		return nil
	}
	// Make sure user isn't already subscribed to target
	err := ts.ls.AppendToList(usersubs, target)
	if err == nil {
		reply.Status = tribrpc.OK
	} else {
		reply.Status = tribrpc.Exists
	}
	return nil
}

func (ts *tribServer) AddSubscription(args *tribrpc.SubscriptionArgs, reply *tribrpc.SubscriptionReply) error {
	user_id := util.FormatUserKey(args.UserID)
	target_user_id := util.FormatUserKey(args.TargetUserID)

	// If the user_id doesn't exist
	// Return error
	_, err := ts.lib_store.Get(user_id)
	if err != nil {
		reply.Status = tribrpc.NoSuchUser
		return nil
	}

	// If the target_user_id doesn't exist
	// Return error
	_, err = ts.lib_store.Get(target_user_id)
	if err != nil {
		reply.Status = tribrpc.NoSuchTargetUser
		return nil
	}

	user_sub := util.FormatSubListKey(args.UserID)
	err = ts.lib_store.AppendToList(user_sub, args.TargetUserID)
	if err != nil {
		reply.Status = tribrpc.Exists
		return nil
	}
	reply.Status = tribrpc.OK
	return nil
}

func (ts *tribServer) RemoveSubscription(args *tribrpc.SubscriptionArgs, reply *tribrpc.SubscriptionReply) error {
	userkey := util.FormatUserKey(args.UserID)
	targetkey := util.FormatUserKey(args.TargetUserID)

	usersubs := util.FormatSubListKey(args.UserID)
	target := args.TargetUserID

	// Make sure user exists
	if _, eu := ts.ls.Get(userkey); eu != nil {
		reply.Status = tribrpc.NoSuchUser
		return nil
	}
	// Make sure target exists
	if _, et := ts.ls.Get(targetkey); et != nil {
		reply.Status = tribrpc.NoSuchTargetUser
		return nil
	}
	// Make sure user is subscribed to target
	if err := ts.ls.RemoveFromList(usersubs, target); err != nil {
		reply.Status = tribrpc.NoSuchTargetUser
	} else {
		reply.Status = tribrpc.OK
	}
	return nil
}

// AddSubscription adds TargerUserID to UserID's list of subscriptions.
// Replies with status NoSuchUser if the specified UserID does not exist, and NoSuchTargerUser
// if the specified TargerUserID does not exist.
func (ts *tribServer) AddSubscription(args *tribrpc.SubscriptionArgs, reply *tribrpc.SubscriptionReply) error {

	userId := args.UserID
	targetId := args.TargetUserID

	userIdKey := util.FormatUserKey(userId)
	targetIdKey := util.FormatUserKey(targetId)

	_, ok_user := ts.libstore.Get(userIdKey)
	_, ok_target := ts.libstore.Get(targetIdKey)
	if ok_user != nil {
		reply.Status = tribrpc.NoSuchUser
	} else if ok_target != nil {
		reply.Status = tribrpc.NoSuchTargetUser
	} else {
		subKey := util.FormatSubListKey(userId)

		err := ts.libstore.AppendToList(subKey, targetId)
		if err != nil {
			reply.Status = tribrpc.Exists
		} else {
			reply.Status = tribrpc.OK
		}
	}
	return nil
}

func (ts *tribServer) CreateUser(args *tribrpc.CreateUserArgs, reply *tribrpc.CreateUserReply) error {
	if DBG {
		fmt.Println("-----> CreateUser")
	}
	var usrID string = args.UserID

	_, err := ts.libStore.Get(util.FormatUserKey(usrID))

	if err == nil {
		//user not found
		reply.Status = tribrpc.Exists
		return nil
		//return err
	}

	err = ts.libStore.Put(util.FormatUserKey(usrID), "exists")

	if err != nil {

		return nil
	}

	//populate reply struct
	reply.Status = tribrpc.OK
	return nil
}

func (ts *tribServer) AddSubscription(args *tribrpc.SubscriptionArgs, reply *tribrpc.SubscriptionReply) error {
	userid := args.UserID
	targetid := args.TargetUserID
	useridkey := util.FormatUserKey(userid)
	targetidkey := util.FormatUserKey(targetid)

	_, userExists := ts.ls.Get(useridkey)

	if userExists != nil {
		reply.Status = tribrpc.NoSuchUser
		return nil
	}

	_, targetExists := ts.ls.Get(targetidkey)

	if targetExists != nil {
		reply.Status = tribrpc.NoSuchTargetUser
		return nil
	}

	userSubListKey := util.FormatSubListKey(userid)
	appendErr := ts.ls.AppendToList(userSubListKey, targetid)

	if appendErr != nil {
		reply.Status = tribrpc.Exists
		return nil
	}

	reply.Status = tribrpc.OK
	return nil
}

func (ts *tribServer) CreateUser(args *tribrpc.CreateUserArgs, reply *tribrpc.CreateUserReply) error {
	if ts.userExist(args.UserID) == true {
		reply.Status = tribrpc.Exists
		return nil
	}
	reply.Status = tribrpc.OK
	ts.ls.Put(util.FormatUserKey(args.UserID), util.FormatUserKey(args.UserID))
	return nil
}

func (ts *tribServer) DeleteTribble(args *tribrpc.DeleteTribbleArgs, reply *tribrpc.DeleteTribbleReply) error {
	if args == nil {
		return errors.New("ts: Can't delete nil")
	}
	if reply == nil {
		return errors.New("ts: Can't reply with nil in Delete")
	}

	_, err := ts.ls.Get(util.FormatUserKey(args.UserID))
	if err != nil {
		reply.Status = tribrpc.NoSuchUser
		return nil
	}

	err = ts.ls.RemoveFromList(util.FormatTribListKey(args.UserID), args.PostKey)
	if err != nil {
		reply.Status = tribrpc.NoSuchPost
		return nil
	}
	if ts.ls.Delete(args.PostKey) != nil {
		reply.Status = tribrpc.NoSuchPost
		return errors.New("Fatal, failed to delete a key")
	}

	reply.Status = tribrpc.OK
	return nil
}

func (ts *tribServer) DeleteTribble(args *tribrpc.DeleteTribbleArgs, reply *tribrpc.DeleteTribbleReply) error {
	userkey := util.FormatUserKey(args.UserID)
	_, userErr := ts.libstore.Get(userkey)
	if userErr != nil {
		reply.Status = tribrpc.NoSuchUser
	} else {

		delErr := ts.libstore.Delete(args.PostKey)
		if delErr != nil {
			reply.Status = tribrpc.NoSuchPost
			return nil
		}

		tribkey := util.FormatTribListKey(args.UserID)
		delListErr := ts.libstore.RemoveFromList(tribkey, args.PostKey)
		if delListErr != nil {
			reply.Status = tribrpc.NoSuchPost
			return nil
		}

		reply.Status = tribrpc.OK

	}
	return nil
}

func (ts *tribServer) GetTribbles(args *tribrpc.GetTribblesArgs, reply *tribrpc.GetTribblesReply) error {
	key := util.FormatUserKey(args.UserID)
	if ts.checkIfKnown(key) {
		triblist_key := util.FormatTribListKey(args.UserID)
		post_ids, err := ts.storage.GetList(triblist_key)
		if err != nil {
			post_ids = []string{}
		}
		sort.Sort(ByChrono(post_ids))
		bound := min(100, len(post_ids))
		tribs := make([]tribrpc.Tribble, bound)
		for i, v := range post_ids[0:bound] {
			postStr, err := ts.storage.Get(v)
			if err != nil {
				return err
			}
			trib := tribrpc.Tribble{}
			json.Unmarshal([]byte(postStr), &trib)
			tribs[i] = trib
		}
		reply.Tribbles = tribs
		reply.Status = tribrpc.OK
	} else {
		reply.Status = tribrpc.NoSuchUser
	}
	return nil
}

func (ts *tribServer) PostTribble(args *tribrpc.PostTribbleArgs, reply *tribrpc.PostTribbleReply) error {
	key := util.FormatUserKey(args.UserID)
	if ts.checkIfKnown(key) {
		newTrib := tribrpc.Tribble{args.UserID, time.Now(), args.Contents}
		tribStr, err := json.Marshal(newTrib)
		if err != nil {
			return err
		}

		id := newTrib.UserID
		time := newTrib.Posted.UnixNano()
		post_key := util.FormatPostKey(id, time)
		for ts.checkIfKnown(post_key) {
			post_key = util.FormatPostKey(id, time)
		}
		err = ts.storage.Put(post_key, string(tribStr))
		if err != nil {
			return err
		}

		triblist_key := util.FormatTribListKey(args.UserID)
		err = ts.storage.AppendToList(triblist_key, post_key)
		if err != nil {
			return err
		}

		reply.PostKey = post_key
		reply.Status = tribrpc.OK
	} else {
		reply.Status = tribrpc.NoSuchUser
	}
	return nil
}

func (ts *tribServer) DeleteTribble(args *tribrpc.DeleteTribbleArgs, reply *tribrpc.DeleteTribbleReply) error {
	key := util.FormatUserKey(args.UserID)
	post_key := args.PostKey

	if !ts.checkIfKnown(key) {
		reply.Status = tribrpc.NoSuchUser
	} else if !ts.checkIfKnown(post_key) {
		reply.Status = tribrpc.NoSuchPost
	} else {
		err := ts.storage.Delete(post_key)
		if err != nil {
			return err
		}

		triblist_key := util.FormatTribListKey(args.UserID)
		err = ts.storage.RemoveFromList(triblist_key, post_key)
		if err != nil {
			return err
		}

		reply.Status = tribrpc.OK

	}
	return nil
}

func (ts *tribServer) GetTribblesBySubscription(args *tribrpc.GetTribblesArgs, reply *tribrpc.GetTribblesReply) error {
	userkey := util.FormatUserKey(args.UserID)
	_, userErr := ts.libstore.Get(userkey)

	if userErr != nil {
		reply.Status = tribrpc.NoSuchUser
	} else {
		reply.Status = tribrpc.OK
		subskey := util.FormatSubListKey(args.UserID)
		subsList, _ := ts.libstore.GetList(subskey)

		totalTribList := make(Tribbles, 0)
		for i := 0; i < len(subsList); i++ {
			curUser := subsList[i]
			curtribList := ts.GetTribblesOneUser(curUser)

			for j := 0; j < len(curtribList); j++ {
				totalTribList = append(totalTribList, curtribList[j])
			}
			//totalTribList = append(totalTribList, curtribList)
		}

		sort.Sort(totalTribList)
		totalLen := len(totalTribList)
		if totalLen > 100 {
			totalLen = 100
		}
		reply.Tribbles = make(Tribbles, totalLen)
		for j := 0; j < totalLen; j++ {
			reply.Tribbles[j] = totalTribList[j]
		}
	}
	return nil

}

/*
-format sublist
*/
func (ts *tribServer) GetTribblesBySubscription(args *tribrpc.GetTribblesArgs, reply *tribrpc.GetTribblesReply) error {

	if DBG {
		fmt.Println("-----> GetTribblesBySubscription")
	}
	var usrID string = args.UserID

	//check if user present in server
	_, err := ts.libStore.Get(util.FormatUserKey(usrID))

	if err != nil {
		switch err.Error() {
		case WRONG_SERVER:
			fmt.Println("ERROR: WRONG SERVER in tribserver")
			return errors.New("Wrong server contacted!")

		case KEY_NOT_FOUND:
			reply.Status = tribrpc.NoSuchUser
			return nil

		default:
			fmt.Println("ERROR in tribserver: wrong error message received")
		}
	}

	//get list of subscribers
	subscrList, err := ts.libStore.GetList(util.FormatSubListKey(usrID))

	if err != nil {
		//return err
		fmt.Println("No subscribers, or error getting list of subscribers")
		reply.Status = tribrpc.OK
		return nil
	}

	//initialise empty slice of all postKeys from subscribers
	var allPostKeys []string = make([]string, 0)

	//populate allPostKeys
	for _, currUser := range subscrList {
		currPostKeys, err := ts.libStore.GetList(util.FormatTribListKey(currUser))

		if err == nil {
			allPostKeys = append(allPostKeys, currPostKeys...)

		} else {
			//fmt.Println("0 tribs for user detected")
		}
	}

	sort.Sort(PostByTime(allPostKeys))

	//choose most recent posts, and get tribbles
	var tribList []tribrpc.Tribble = ts.getTribbleList(allPostKeys)

	reply.Tribbles = tribList
	reply.Status = tribrpc.OK
	return nil

}

func (ts *tribServer) PostTribble(args *tribrpc.PostTribbleArgs, reply *tribrpc.PostTribbleReply) error {

	userkey := util.FormatUserKey(args.UserID)

	_, userErr := ts.libstore.Get(userkey)
	if userErr != nil {
		reply.Status = tribrpc.NoSuchUser
	} else {
		postTime := time.Now()
		tribble := &tribrpc.Tribble{
			UserID:   args.UserID,
			Posted:   postTime,
			Contents: args.Contents,
		}
		marshalTribble, _ := json.Marshal(tribble)

		unixTime := int64(postTime.UnixNano())
		postKey := util.FormatPostKey(args.UserID, unixTime)

		putErr := ts.libstore.Put(postKey, string(marshalTribble))
		if putErr != nil {
			return errors.New("Fail to put postkey and tribble")
		}

		tribListKey := util.FormatTribListKey(args.UserID)
		appendErr := ts.libstore.AppendToList(tribListKey, postKey)
		if appendErr != nil {
			return errors.New("Fail to append tribble to user")
		}
		reply.Status = tribrpc.OK
		reply.PostKey = postKey
	}

	return nil
}