lmqtt

README

lmqtt - a MQTT library

This library is based on the quite nice gmqtt project but with fewer features. If you are looking for a complete MQTT server in Go with monitoring, a pre-built service and plugins to extend the features have a look at it.

Get Started

To get started with gmqtt, we need to compile it from the source code. Please ensure that you have a working Go environment.

The following command will start gmqtt broker with default configuration. The broker listens on 1883 for tcp server and 8883 for websocket server with admin and prometheus plugin loaded.

git clone https://github.com/lab5e/lmqtt
cd gmqtt/cmd/gmqttd
go run . start -c default_config.yml

configuration

Gmqtt use -c flag to define configuration path. If not set, gmqtt reads $HOME/gmqtt.yml as default. Here is a sample configuration.

session persistence

Gmqtt uses memory to store session data by default and it is the recommended way because of the good performance. But the session data will be lose after the broker restart. You can use redis as backend storage to prevent data loss from restart:

persistence:
  type: redis
  redis:
    # redis server address
    addr: "127.0.0.1:6379"
    # the maximum number of idle connections in the redis connection pool
    max_idle: 1000
    # the maximum number of connections allocated by the redis connection pool at a given time.
    # If zero, there is no limit on the number of connections in the pool.
    max_active: 0
    # the connection idle timeout, connection will be closed after remaining idle for this duration. If the value is zero, then idle connections are not closed
    idle_timeout: 240s
    password: ""
    # the number of the redis database
    database: 0

Authentication

Gmqtt provides a simple username/password authentication mechanism. (Provided by auth plugin). It is not enabled in default configuration, you can change the configuration to enable it:

# plugin loading orders
plugin_order:
  - auth
  - prometheus
  - admin

When auth plugin enabled, every clients need an account to get connected.You can add accounts through the HTTP API:

# Create: username = user1, password = user1pass
$ curl -X POST -d '{"password":"user1pass"}' 127.0.0.1:8083/v1/accounts/user1
{}
# Query
$ curl 127.0.0.1:8083/v1/accounts/user1
{"account":{"username":"user1","password":"20a0db53bc1881a7f739cd956b740039"}}

API Doc swagger

Docker

docker build -t gmqtt .
docker run -p 1883:1883 -p 8883:8883 -p 8082:8082 -p 8083:8083  -p 8084:8084  gmqtt

Documentation

godoc

Hooks

Gmqtt implements the following hooks:

Name	hooking point	possible usages
OnAccept	When accepts a TCP connection.(Not supported in websocket)	Connection rate limit, IP allow/block list.
OnStop	When gmqtt stop
OnSubscribe	When received a subscribe packet	Subscribe access control, modifies subscriptions.
OnSubscribed	When subscribe succeed
OnUnsubscribe	When received a unsubscribe packet	Unsubscribe access controls, modifies the topics that is going to unsubscribe.
OnUnsubscribed	When unsubscribe succeed
OnMsgArrived	When received a publish packet	Publish access control, modifies message before delivery.
OnBasicAuth	When received a connect packet without AuthMethod property	Authentication
OnEnhancedAuth	When received a connect packet with AuthMethod property (Only for v5 clients)	Authentication
OnReAuth	When received a auth packet (Only for v5 clients)	Authentication
OnConnected	When the client connected succeed
OnSessionCreated	When creates a new session
OnSessionResumed	When resumes from old session
OnSessionTerminated	When session terminated
OnDelivered	When a message is delivered to the client
OnClosed	When the client is closed
OnMsgDropped	When a message is dropped for some reasons
OnWillPublish	When the client is going to deliver a will message	Modify or drop the will message
OnWillPublished	When a will message has been delivered

See /examples/hook for details.

How to write plugins

How to write plugins

Contributing

Contributions are always welcome, see Contribution Guide for a complete contributing guide.

Test

Unit Test

go test -race ./...

Integration Test

paho.mqtt.testing.