The VerneMQ HTTP API

The VerneMQ HTTP API is enabled by default and installs an HTTP handler on http://localhost:8888/api/v1. To read more about configuring the HTTP listener, see HTTP Listener Configuration. You can configure a HTTP listener, or a HTTPS listener to serve the HTTP API v1.

Managing API keys

The VerneMQ HTTP API uses basic authentication where an API key is passed as the username and the password is left empty. So the first step to us the HTTP API is to create an API key:

$ vmq-admin api-key create
JxctXkZ1OTVnlwvguSCE9KtujacMkOLF

The key is persisted and available on all cluster nodes.

To list existing keys do:

$ vmq-admin api-key show
+--------------------------------+
|              Key               |
+--------------------------------+
|JxctXkZ1OTVnlwvguSCE9KtujacMkOLF|
+--------------------------------+

To add an API key of your own choosing, do: vmq-admin api-key add key=mykey

To delete an API key do:

vmq-admin api-key delete key=JxctXkZ1OTVnlwvguSCE9KtujacMkOLF

API usage

The VerneMQ HTTP API is a wrapper over the vmq-admin CLI tool, and anything that can be done using vmq-admin can be done using the HTTP API. Note that the HTTP API is therefore subject to any changes made to the vmq-admin tools and their flags & options structure. All requests are performed doing a HTTP GET and if no errors occurred an HTTP 200 OK code is returned with a possible non-empty JSON payload.

The API is using basic auth where the API key is passed as the username. An example using curl would look like this:

curl "http://[email protected]:8888/api/v1/session/show"

The mapping between vmq-admin and the HTTP API is straightforward, and if one is already familiar with how the vmq-admin tool works, working with the API should be easy. The mapping works such that the command part of a vmq-admin invocation is turned into a path, and the options and flags are turned into the query string.

A mandatory parameter like the client-id in the sudo vmq-admin session disconnect client-id=myclient command should be translated as: ?client-id=myclient.

An optional flag like --cleanup in the sudo vmq-admin session disconnect client-id=myclient --cleanup command should be translated as: &--cleanup

Let's look at the cluster join command as an example, which looks like this:

vmq-admin cluster join [email protected]

This turns into a GET request:

GET /api/v1/cluster/[email protected]

To test, run it with curl:

curl "http://[email protected]:8888/api/v1/cluster/[email protected]"

And the returned response would look like:

{
    "text": "Done",
    "type": "text"
}

Below are some other examples.

Get cluster status information

Request:

GET /api/v1/cluster/show

Curl:

curl "http://[email protected]:8888/api/v1/cluster/show"

Response:

{
   "type" : "table",
   "table" : [
      {
         "Running" : true,
         "Node" : "[email protected]"
      }
   ]
}

Retrieve session information

Request:

GET /api/v1/session/show

Curl:

curl "http://[email protected]:8888/api/v1/session/show"

Response:

{
   "type" : "table",
   "table" : [
      {
         "user" : null,
         "client_id" : "mosqsub/11690-algol",
         "peer_host" : "localhost",
         "pid" : "<0.551.0>",
         "peer_port" : 50964
      },
      {
         "peer_host" : "localhost",
         "pid" : "<0.557.0>",
         "peer_port" : 50996,
         "user" : null,
         "client_id" : "mosqsub/11767-algol"
      }
   ]
}

List all installed listeners

Request:

GET /api/v1/listener/show

Curl:

curl "http://[email protected]:8888/api/v1/listener/show"

Response:

{
   "type" : "table",
   "table" : [
      {
         "max_conns" : 10000,
         "port" : "8888",
         "mountpoint" : "",
         "ip" : "127.0.0.1",
         "type" : "http",
         "status" : "running"
      },
      {
         "status" : "running",
         "max_conns" : 10000,
         "port" : "44053",
         "mountpoint" : "",
         "ip" : "0.0.0.0",
         "type" : "vmq"
      },
      {
         "max_conns" : 10000,
         "port" : "1883",
         "mountpoint" : "",
         "ip" : "127.0.0.1",
         "type" : "mqtt",
         "status" : "running"
      }
   ]
}

Retrieve plugin information

Request:

GET /api/v2/plugin/show

Curl:

curl "http://[email protected]:8888/api/v1/plugin/show"

Response:

    {
   "type" : "table",
   "table" : [
      {
         "Hook(s)" : "auth_on_register\n",
         "Plugin" : "vmq_passwd",
         "M:F/A" : "vmq_passwd:auth_on_register/5\n",
         "Type" : "application"
      },
      {
         "Type" : "application",
         "M:F/A" : "vmq_acl:auth_on_publish/6\nvmq_acl:auth_on_subscribe/3\n",
         "Plugin" : "vmq_acl",
         "Hook(s)" : "auth_on_publish\nauth_on_subscribe\n"
      }
   ]
}

Set configuration values

Request:

GET /api/v1/set?allow_anonymous=on

Curl:

curl "http://[email protected]:8888/api/v1/set?allow_anonymous=on"

Response:

[]

Disconnect a client

Request:

GET /api/v1/session/disconnect?client-id=myclient&--cleanup

Curl:

curl "http://[email protected]:8888/api/v1/session/disconnect?client-id=myclient&--cleanup"

Response:

[]