im/src/server/models/user/users.js

/**
 * 用户集合。管理Redis中的用户列表。
 *
 * author: Sand
 * since: 12/13/2016
 */
"use strict";

let RedisClient = require('../../repository/redis/redis.client');
let RedisModel = require('../redis.model');
let ImDb = require('../../repository/mysql/db/im.db');
let ParticipantRepo = require('../../repository/mysql/participant.repo');
let DoctorRepo = require('../../repository/mysql/doctor.repo');
let PatientRepo = require('../../repository/mysql/patient.repo');
let SessionRepo = require('../../repository/mysql/session.repo');
let MessageRepo = require('../../repository/mysql/message.repo');
let TopicRepo = require('../../repository/mysql/topics.repo');
let ModelUtil = require('../../util/model.util');
let ObjectUtil = require("../../util/object.util.js");
let Patient = require('./patient');
let Doctor = require('./doctor');

let redisConn = RedisClient.redisClient().connection;
let async = require('async');
let log = require('../../util/log');
let configFile = require('../../include/commons').CONFIG_FILE;
let config = require('../../resources/config/' + configFile);

const REDIS_KEYS = require('../../include/commons').REDIS_KEYS;
const PLATFORMS = require('../../include/commons').PLATFORM;

class Users extends RedisModel {
    constructor() {
        super();
    }

    /**
     * 获取用户，直接从MYSQL获取，缓存是否有在不能确定。
     *
     * @param userId
     * @param outCallback
     */
    getUserFromMySQL(userId, outCallback) {
        let self = this;
        async.waterfall([
            // determine user type
            function (callback) {
                Users.isPatientId(userId, function (err, isPatient) {
                    callback(null, isPatient);
                });
            },
            // get from mysql
            function (isPatientId) {
                let repoProto = isPatientId ? PatientRepo : DoctorRepo;
                repoProto.findOne(userId, function (err, res) {
                    let user = isPatientId ? new Doctor() : new Patient();
                    if (res.length > 0) {
                        user.name = res[0].name;
                        user.sex = res[0].sex;
                        user.birthdate = res[0].birthdate;
                        user.avatar = res[0].avatar;
                    }

                    outCallback(null, user);
                });
            }
        ]);
    }

    /**
     * 用户登录，仅缓存用户客户端状态信息，不缓存用户基本信息。
     *
     * 用户登录时会加载与之相关的会话列表，会话消息，用户自身信息：App状态与微信状态。
     *
     * TODO: 如果用户已经登录，但因为异常退出重新登录，是否需要刷新状态信息。
     *
     * @param userId
     * @param platform
     * @param token
     * @param clientId
     *
     * @return 用户token
     */
    login(userId, platform, token, clientId) {
        let self = this;
        let loginFromApp = platform !== PLATFORMS.Wechat;

        let usersKey = REDIS_KEYS.Users;
        let userKey = RedisModel.makeRedisKey(REDIS_KEYS.User, userId);
        let userStatusKey = RedisModel.makeRedisKey(loginFromApp ? REDIS_KEYS.UserAppStatus : REDIS_KEYS.UserWechatStatus, userId);
        let lastLoginTime = new Date();

        async.waterfall([
                // get user info from mysql
                function (callback) {
                    self.getUserFromMySQL(userId, function (err, userInfo) {
                        if (userInfo === null) {
                            ModelUtil.emitDataNotFound(self, 'User not exists.');
                            return;
                        }

                        callback(null, userInfo);
                    })
                },
                // cache user app/wechat status
                function (userInfo, callback) {
                    let multi = redisConn.multi()
                        .zadd(usersKey, lastLoginTime.getTime(), userId);
                    //.hmset(userKey, 'avatar', userInfo.avatar ? userInfo.avatar : '', 'birthdate', userInfo.birthdate ? userInfo.birthdate : '',
                    //    'name', userInfo.name, 'role', loginFromApp ? 'doctor' : 'patient');

                    if (loginFromApp) {
                        // cache app status
                        multi = multi.hmset(userStatusKey, 'platform', platform, 'app_in_bg', false, 'client_id', clientId,
                            'token', token, 'last_login_time', lastLoginTime.getTime());
                    } else {
                        // cache wechat status
                        multi = multi.hmset(userKey, 'open_id', userInfo.open_id, 'last_login_time', lastLoginTime.getTime());
                    }

                    multi.execAsync().then(function (res) {
                        callback(null);
                    });
                },
                // cache sessions, participants, topics, messages
                function (callback) {
                    SessionRepo.findAll(userId, function (err, sessions) {
                        if (err) {
                            ModelUtil.emitError(self.eventEmitter, err.message);
                            return;
                        }

                        sessions.forEach(function (session) {
                            redisConn.zscore(REDIS_KEYS.Sessions, session.id, function (err, res) {
                                // 已经缓存过的会话不再缓存
                                if (res != null) return;

                                (function (sessionId, userId) {
                                    let redisSession = [
                                        "id", session.id,
                                        "name", session.name,
                                        "type", session.type,
                                        "business_type", session.business_type || 1,
                                        "last_sender_id", session.last_sender_id == null ? "" : session.last_sender_id,
                                        "last_sender_name", session.last_sender_name == null ? "" : session.last_sender_name,
                                        "last_content_type", session.last_content_type == null ? "" : session.last_content_type,
                                        "last_content", session.last_content == null ? "" : session.last_content,
                                        "last_message_time", session.last_message_time == null ? "" : session.last_message_time,
                                        "create_date", ObjectUtil.timestampToLong(session.create_date),
                                    ];

                                    // cache sessions
                                    redisConn.multi()
                                        .zadd(REDIS_KEYS.Sessions, lastLoginTime.getTime(), sessionId)                                           // 会话的最后活动时间设置为此用户的登录时间
                                        .zadd(RedisModel.makeRedisKey(REDIS_KEYS.UserSessions, userId), lastLoginTime.getTime(), sessionId)      // 会话的最后活动时间设置为此用户的登录时间
                                        .hmset(RedisModel.makeRedisKey(REDIS_KEYS.Session, sessionId), redisSession)
                                        .execAsync()
                                        .then(function (res) {
                                            // cache participants
                                            let sessionParticipantsKey = RedisModel.makeRedisKey(REDIS_KEYS.SessionParticipants, sessionId);
                                            let sessionParticipantsRoleKey = RedisModel.makeRedisKey(REDIS_KEYS.SessionParticipantsRole, sessionId);
                                            ParticipantRepo.findAll(sessionId, function (err, participants) {
                                                if (err) {
                                                    ModelUtil.emitError(self.eventEmitter, err.message);
                                                    return;
                                                }

                                                let multi = redisConn.multi();
                                                participants.forEach(function (participant) {
                                                    let participantId = participant.id;
                                                    let participantRole = participant.role;
                                                    let score = ObjectUtil.timestampToLong(participant.last_fetch_time);

                                                    multi = multi.zadd(sessionParticipantsKey, score, participantId)
                                                        .hset(sessionParticipantsRoleKey, participantId, participantRole);
                                                });

                                                multi.execAsync().then(function (res) {
                                                });
                                            });

                                            // cache messages
                                            let messagesKey = RedisModel.makeRedisKey(REDIS_KEYS.Messages, sessionId);
                                            let messagesByTimestampKey = RedisModel.makeRedisKey(REDIS_KEYS.MessagesByTimestamp, sessionId);
                                            MessageRepo.findBySessionId(sessionId, 0, config.sessionConfig.maxMessageCount, null, function (err, messages) {
                                                if (err) {
                                                    ModelUtil.emitError(self.eventEmitter, err.message);
                                                    return;
                                                }

                                                let multi = redisConn.multi();
                                                messages.forEach(function (message) {
                                                    let msgJson = {
                                                        id: message.id,
                                                        sender_id: message.sender_id,
                                                        sender_name: message.sender_name,
                                                        timestamp: ObjectUtil.timestampToLong(message.timestamp),
                                                        content_type: message.content_type,
                                                        content: message.content
                                                    };

                                                    multi = multi.hset(messagesKey, message.id, JSON.stringify(msgJson))
                                                        .zadd(messagesByTimestampKey, ObjectUtil.timestampToLong(message.timestamp), message.id);
                                                });

                                                multi.execAsync().then(function (res) {
                                                });
                                            });

                                            // cache topics for MUC
                                            let topicsKey = RedisModel.makeRedisKey(REDIS_KEYS.Topics, sessionId);
                                            TopicRepo.findAllBySessionId(sessionId, function (err, topics) {
                                                if (err) {
                                                    ModelUtil.emitError(self.eventEmitter, err.message);
                                                    return;
                                                }

                                                topics.forEach(function (topic) {
                                                    let topicKey = RedisModel.makeRedisKey(REDIS_KEYS.Topic, topic.id);
                                                    let topicId = topic.id;
                                                    let name = topic.name == null ? "" : topic.name;
                                                    let createTime = ObjectUtil.timestampToLong(topic.create_time);
                                                    let endBy = topic.end_by == null ? "" : topic.end_by;
                                                    let endTime = topic.end_time == null ? 0 : ObjectUtil.timestampToLong(topic.end_time);
                                                    let startMessageId = topic.start_message_id == null ? "" : topic.start_message_id;
                                                    let endMessageId = topic.end_message_id == null ? "" : topic.end_message_id;
                                                    let description = topic.description == null ? "" : topic.description;
                                                    let status = topic.status == null ? 0 : topic.status;
                                                    redisConn.multi()
                                                        .zadd(topicsKey, topicId)
                                                        .hmset(topicKey,
                                                            'name', name,
                                                            'session_id', sessionId,
                                                            'create_time', createTime,
                                                            'end_by', endBy,
                                                            'end_time', endTime,
                                                            'start_message_id', startMessageId,
                                                            'end_message_id', endMessageId,
                                                            'description', description,
                                                            'status', status)
                                                        .execAsync().then(function (res) {
                                                    });
                                                });
                                            });
                                        });
                                })(session.id, userId);
                            });
                        });
                    });

                    callback(null, null);
                }
            ],
            function (err, res) {
                ModelUtil.emitOK(self.eventEmitter, {});
            });
    }

    logout(userId) {
        let self = this;
        async.waterfall([
                function (callback) {
                    Users.isPatientId(userId, function (err, isPatient) {
                        callback(null, isPatient)
                    });
                },
                function (isPatient, callback) {
                    let usersKey = REDIS_KEYS.Users;
                    let userStatusKey = RedisModel.makeRedisKey(isPatient ? REDIS_KEYS.UserWechatStatus : REDIS_KEYS.UserAppStatus, userId);
                    redisConn.multi()
                        .zrem(usersKey, userId)
                        .del(userStatusKey)
                        .execAsync()
                        .then(function (res) {
                            if (res.length > 0 && res[0] === 0) {
                                ModelUtil.emitDataNotFound(self.eventEmitter, {message: "User not found."});
                            } else {
                                ModelUtil.emitOK(self.eventEmitter, {});
                            }
                        });
                }],
            function (err, res) {
            }
        );
    }

    /**
     * 用户ID是否属于患者。
     *
     * @param userId
     * @param callback
     */
    static isPatientId(userId, callback) {
        async.waterfall([
                function (callback) {
                    var sql = "select case when count(*) > 0 then true else false end 'is_patient' from patients where id = ?";

                    ImDb.execQuery({
                        "sql": sql,
                        "args": [userId],
                        "handler": function (err, res) {
                            if (err) callback(err, res);

                            callback(null, res);
                        }
                    });
                },
                function (res, callback) {
                    if (res.length === 0) return false;

                    callback(null, res[0].is_patient);
                }
            ],
            function (err, res) {
                if (err) {
                    log.error("User id check failed: ", err);
                    callback(null, false);
                    return;
                }

                callback(null, res !== 0);
            });
    }
}

let Promises = require('bluebird');
Promises.promisifyAll(Users.prototype);

module.exports = Users;