MongoDB 消息存储

MongoDB 消息存储

配置 MongoDB 消息存储

配置文件: emqx_backend_mongo.conf

配置 MongoDB 服务器

支持配置多台 MongoDB 服务器连接池:

## MongoDB 集群类型: single | unknown | sharded | rs
backend.mongo.pool1.type = single

## 如果 type = rs; 需要配置 setname
## backend.mongo.pool1.rs_set_name = testrs

## MongoDB 服务器地址列表
backend.mongo.pool1.server = 127.0.0.1:27017

## MongoDB 连接池大小
backend.mongo.pool1.c_pool_size = 8

## 连接的数据库名称
backend.mongo.pool1.database = mqtt

## MongoDB 认证用户名密码
## backend.mongo.pool1.login =  emqtt
## backend.mongo.pool1.password = emqtt

## MongoDB 认证源
## backend.mongo.pool1.auth_source = admin

## 是否开启 SSL
## backend.mongo.pool1.ssl = false

## SSL 密钥文件路径
## backend.mongo.pool1.keyfile =

## SSL 证书文件路径
## backend.mongo.pool1.certfile =

## SSL CA 证书文件路径
## backend.mongo.pool1.cacertfile =

## MongoDB 数据写入模式: unsafe | safe
## backend.mongo.pool1.w_mode = safe

## MongoDB 数据读取模式: master | slaver_ok
## backend.mongo.pool1.r_mode = slave_ok

## MongoDB 底层 driver 配置, 保持默认即可
## backend.mongo.topology.pool_size = 1
## backend.mongo.topology.max_overflow = 0
## backend.mongo.topology.overflow_ttl = 1000
## backend.mongo.topology.overflow_check_period = 1000
## backend.mongo.topology.local_threshold_ms = 1000
## backend.mongo.topology.connect_timeout_ms = 20000
## backend.mongo.topology.socket_timeout_ms = 100
## backend.mongo.topology.server_selection_timeout_ms = 30000
## backend.mongo.topology.wait_queue_timeout_ms = 1000
## backend.mongo.topology.heartbeat_frequency_ms = 10000
## backend.mongo.topology.min_heartbeat_frequency_ms = 1000

## MongoDB Backend Hooks
backend.mongo.hook.client.connected.1    = {"action": {"function": "on_client_connected"}, "pool": "pool1"}
backend.mongo.hook.session.created.1     = {"action": {"function": "on_subscribe_lookup"}, "pool": "pool1"}
backend.mongo.hook.client.disconnected.1 = {"action": {"function": "on_client_disconnected"}, "pool": "pool1"}
backend.mongo.hook.session.subscribed.1  = {"topic": "#", "action": {"function": "on_message_fetch"}, "pool": "pool1", "offline_opts": {"time_range": "2h", "max_returned_count": 500}}
backend.mongo.hook.session.subscribed.2  = {"topic": "#", "action": {"function": "on_retain_lookup"}, "pool": "pool1"}
backend.mongo.hook.session.unsubscribed.1= {"topic": "#", "action": {"function": "on_acked_delete"}, "pool": "pool1"}
backend.mongo.hook.message.publish.1     = {"topic": "#", "action": {"function": "on_message_publish"}, "pool": "pool1"}
backend.mongo.hook.message.publish.2     = {"topic": "#", "action": {"function": "on_message_retain"}, "pool": "pool1"}
backend.mongo.hook.message.publish.3     = {"topic": "#", "action": {"function": "on_retain_delete"}, "pool": "pool1"}
backend.mongo.hook.message.acked.1       = {"topic": "#", "action": {"function": "on_message_acked"}, "pool": "pool1"}

## 获取离线消息
##  "offline_opts": 获取离线消息的配置
##     - max_returned_count: 单次拉去的最大离线消息数目
##     - time_range: 仅拉去在当前时间范围的消息
## backend.mongo.hook.session.subscribed.1  = {"topic": "#", "action": {"function": "on_message_fetch"}, "pool": "pool1", "offline_opts": {"time_range": "2h", "max_returned_count": 500}}

## 如果需要存储 Qos0 消息, 可开启以下配置
## 警告: 当开启以下配置时, 需关闭 'on_message_fetch', 否则 qos1, qos2 消息会被存储俩次
## backend.mongo.hook.message.publish.4     = {"topic": "#", "action": {"function": "on_message_store"}, "pool": "pool1", "payload_format": "mongo_json"}

backend 消息存储规则包括:

MongoDB 数据库初始化

use mqtt
db.createCollection("mqtt_client")
db.createCollection("mqtt_sub")
db.createCollection("mqtt_msg")
db.createCollection("mqtt_retain")
db.createCollection("mqtt_acked")

db.mqtt_client.ensureIndex({clientid:1, node:2})
db.mqtt_sub.ensureIndex({clientid:1})
db.mqtt_msg.ensureIndex({sender:1, topic:2})
db.mqtt_retain.ensureIndex({topic:1})

Tip

数据库名称可自定义

MongoDB 用户状态集合(Client Collection)

mqtt_client 存储设备在线状态:

{
    clientid: string,
    state: 0,1, //0离线 1在线
    node: string,
    online_at: timestamp,
    offline_at: timestamp
}

查询设备在线状态:

db.mqtt_client.findOne({clientid: ${clientid}})

例如 ClientId 为 test 客户端上线:

   db.mqtt_client.findOne({clientid: "test"})

   {
       "_id" : ObjectId("58646c9bdde89a9fb9f7fb73"),
       "clientid" : "test",
       "state" : 1,
       "node" : "emqx@127.0.0.1",
       "online_at" : 1482976411,
       "offline_at" : null
   }

例如 ClientId 为 test 客户端下线:

db.mqtt_client.findOne({clientid: "test"})

{
    "_id" : ObjectId("58646c9bdde89a9fb9f7fb73"),
    "clientid" : "test",
    "state" : 0,
    "node" : "emqx@127.0.0.1",
    "online_at" : 1482976411,
    "offline_at" : 1482976501
}

MongoDB 用户订阅主题集合(Subscription Collection)

mqtt_sub 存储订阅关系:

{
    clientid: string,
    topic: string,
    qos: 0,1,2
}

用户 test 分别订阅主题 test_topic0 test_topic1 test_topic2:

db.mqtt_sub.insert({clientid: "test", topic: "test_topic1", qos: 1})
db.mqtt_sub.insert({clientid: "test", topic: "test_topic2", qos: 2})

某个客户端订阅主题:

db.mqtt_sub.find({clientid: ${clientid}})

查询 ClientId 为 “test” 的客户端已订阅主题:

db.mqtt_sub.find({clientid: "test"})

{ "_id" : ObjectId("58646d90c65dff6ac9668ca1"), "clientid" : "test", "topic" : "test_topic1", "qos" : 1 }
{ "_id" : ObjectId("58646d96c65dff6ac9668ca2"), "clientid" : "test", "topic" : "test_topic2", "qos" : 2 }

MongoDB 发布消息集合(Message Collection)

mqtt_msg 存储 MQTT 消息:

{
    _id: int,
    topic: string,
    msgid: string,
    sender: string,
    qos: 0,1,2,
    retain: boolean (true, false),
    payload: string,
    arrived: timestamp
}

查询某个客户端发布的消息:

   db.mqtt_msg.find({sender: ${clientid}})

查询 ClientId 为 “test” 的客户端发布的消息:

db.mqtt_msg.find({sender: "test"})
{
    "_id" : 1,
    "topic" : "/World",
    "msgid" : "AAVEwm0la4RufgAABeIAAQ==",
    "sender" : "test",
    "qos" : 1,
    "retain" : 1,
    "payload" : "Hello world!",
    "arrived" : 1482976729
}

MongoDB 保留消息集合(Retain Message Collection)

mqtt_retain 存储 Retain 消息:

{
    topic: string,
    msgid: string,
    sender: string,
    qos: 0,1,2,
    payload: string,
    arrived: timestamp
}

查询 retain 消息:

db.mqtt_retain.findOne({topic: ${topic}})

查询topic为 “t/retain” 的 retain 消息:

db.mqtt_retain.findOne({topic: "t/retain"})
{
    "_id" : ObjectId("58646dd9dde89a9fb9f7fb75"),
    "topic" : "t/retain",
    "msgid" : "AAVEwm0la4RufgAABeIAAQ==",
    "sender" : "c1",
    "qos" : 1,
    "payload" : "Hello world!",
    "arrived" : 1482976729
}

MongoDB 接收消息 ack 集合(Message Acked Collection)

mqtt_acked 存储客户端消息确认:

{
    clientid: string,
    topic: string,
    mongo_id: int
}

启用 MongoDB 数据存储插件

./bin/emqx_ctl plugins load emqx_backend_mongo