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MaxScale/Documentation/REST-API/Resources-MaxScale.md
Markus Mäkelä 40cbf37d64 Add example to REST API module command documentation 
Added an example that demonstrates how to call a module command with
parameters via the REST API.
2017-10-12 12:29:43 +03:00

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# MaxScale Resource
The MaxScale resource represents a MaxScale instance and it is the core on top
of which the modules build upon.
## Resource Operations
## Get global information
Retrieve global information about a MaxScale instance. This includes various
file locations, configuration options and version information.
```
GET /v1/maxscale
```
#### Response
`Status: 200 OK`
```javascript
{
"links": {
"self": "http://localhost:8989/v1/maxscale/"
},
"data": {
"attributes": {
"parameters": {
"libdir": "/usr/lib64/maxscale",
"datadir": "/var/lib/maxscale",
"process_datadir": "/var/lib/maxscale/data16218",
"cachedir": "/var/cache/maxscale",
"configdir": "/etc",
"config_persistdir": "/var/lib/maxscale/maxscale.cnf.d",
"module_configdir": "/etc/maxscale.modules.d",
"piddir": "/var/run/maxscale",
"logdir": "/var/log/maxscale",
"langdir": "/var/lib/maxscale",
"execdir": "/usr/bin",
"connector_plugindir": "/var/lib/plugin",
"threads": 4,
"thread_stack_size": 8388608,
"auth_connect_timeout": 3,
"auth_read_timeout": 1,
"auth_write_timeout": 2,
"skip_permission_checks": false,
"admin_auth": false,
"admin_enabled": true,
"admin_log_auth_failures": true,
"admin_host": "::",
"admin_port": 8989,
"admin_ssl_key": "",
"admin_ssl_cert": "",
"admin_ssl_ca_cert": "",
"query_classifier": ""
},
"version": "2.2.0",
"commit": "aa1a413cd961d467083d1974c2a027f612201845",
"started_at": "Wed, 06 Sep 2017 06:51:54 GMT",
"uptime": 1227
},
"id": "maxscale",
"type": "maxscale"
}
}
```
## Update MaxScale parameters
Update MaxScale parameters. The request body must define updated values for the
`data.attributes.parameters` object. The following parameters can be altered:
- [admin_auth](../Getting-Started/Configuration-Guide.md#admin_auth)
- [auth_connect_timeout](../Getting-Started/Configuration-Guide.md#auth_connect_timeout)
- [auth_read_timeout](../Getting-Started/Configuration-Guide.md#auth_read_timeout)
- [auth_write_timeout](../Getting-Started/Configuration-Guide.md#auth_write_timeout)
- [admin_log_auth_failures](../Getting-Started/Configuration-Guide.md#admin_log_auth_failures)
- [passive](../Getting-Started/Configuration-Guide.md#passive)
```
PATCH /v1/maxscale
```
#### Response
Parameters modified:
`Status: 204 No Content`
Invalid JSON body:
`Status: 403 Forbidden`
## Get thread information
Get the information and statistics of a particular thread. The _:id_ in
the URI must map to a valid thread number between 0 and the configured
value of `threads`.
```
GET /v1/maxscale/threads/:id
```
#### Response
`Status: 200 OK`
```javascript
{
"links": {
"self": "http://localhost:8989/v1/maxscale/threads/0"
},
"data": {
"id": "0",
"type": "threads",
"attributes": {
"stats": {
"reads": 2,
"writes": 0,
"errors": 0,
"hangups": 0,
"accepts": 0,
"blocking_polls": 180,
"event_queue_length": 1,
"max_event_queue_length": 1,
"max_exec_time": 0,
"max_queue_time": 0
}
},
"links": {
"self": "http://localhost:8989/v1/threads/0"
}
}
}
```
## Get information for all threads
Get the informatino for all threads. Returns a collection of threads resources.
```
GET /v1/maxscale/threads
```
#### Response
`Status: 200 OK`
```javascript
{
"links": {
"self": "http://localhost:8989/v1/maxscale/threads/"
},
"data": [
{
"id": "0",
"type": "threads",
"attributes": {
"stats": {
"reads": 1,
"writes": 0,
"errors": 0,
"hangups": 0,
"accepts": 0,
"blocking_polls": 116,
"event_queue_length": 1,
"max_event_queue_length": 1,
"max_exec_time": 0,
"max_queue_time": 0
}
},
"links": {
"self": "http://localhost:8989/v1/threads/0"
}
},
{
"id": "1",
"type": "threads",
"attributes": {
"stats": {
"reads": 1,
"writes": 0,
"errors": 0,
"hangups": 0,
"accepts": 0,
"blocking_polls": 116,
"event_queue_length": 1,
"max_event_queue_length": 1,
"max_exec_time": 0,
"max_queue_time": 0
}
},
"links": {
"self": "http://localhost:8989/v1/threads/1"
}
},
{
"id": "2",
"type": "threads",
"attributes": {
"stats": {
"reads": 1,
"writes": 0,
"errors": 0,
"hangups": 0,
"accepts": 0,
"blocking_polls": 116,
"event_queue_length": 1,
"max_event_queue_length": 1,
"max_exec_time": 0,
"max_queue_time": 0
}
},
"links": {
"self": "http://localhost:8989/v1/threads/2"
}
},
{
"id": "3",
"type": "threads",
"attributes": {
"stats": {
"reads": 1,
"writes": 0,
"errors": 0,
"hangups": 0,
"accepts": 0,
"blocking_polls": 116,
"event_queue_length": 1,
"max_event_queue_length": 1,
"max_exec_time": 0,
"max_queue_time": 0
}
},
"links": {
"self": "http://localhost:8989/v1/threads/3"
}
}
]
}
```
## Get logging information
Get information about the current state of logging, enabled log files and the
location where the log files are stored.
```
GET /v1/maxscale/logs
```
#### Response
`Status: 200 OK`
```javascript
{
"links": {
"self": "http://localhost:8989/v1/maxscale/logs/"
},
"data": {
"attributes": {
"parameters": {
"highprecision": false,
"maxlog": true,
"syslog": true,
"throttling": {
"count": 10,
"suppress_ms": 10000,
"window_ms": 1000
},
"log_warning": true,
"log_notice": true,
"log_info": true,
"log_debug": false,
"log_to_shm": false
},
"log_file": "/home/markusjm/build/log/maxscale/maxscale.log",
"log_priorities": [
"error",
"warning",
"notice",
"info"
]
},
"id": "logs",
"type": "logs"
}
}
```
## Update logging parameters
Update logging parameters. The request body must define updated values for the
`data.attributes.parameters` object. All logging parameters apart from
`log_to_shm` can be altered at runtime.
```
PATCH /v1/maxscale/logs
```
#### Response
Parameters modified:
`Status: 204 No Content`
Invalid JSON body:
`Status: 403 Forbidden`
## Flush and rotate log files
Flushes any pending messages to disk and reopens the log files. The body of the
message is ignored.
```
POST /v1/maxscale/logs/flush
```
#### Response
`Status: 204 No Content`
## Get task schedule
Retrieve all pending tasks that are queued for execution.
```
GET /v1/maxscale/tasks
```
#### Response
`Status: 200 OK`
```javascript
{
"links": {
"self": "http://localhost:8989/v1/maxscale/tasks/"
},
"data": [] // No tasks active
}
```
## Get loaded modules
Retrieve information about a loaded module. This includes version, API and
maturity information as well as all the parameters that the module defines.
```
GET /v1/maxscale/modules
```
#### Response
`Status: 200 OK`
```javascript
{
"links": {
"self": "http://localhost:8989/v1/maxscale/modules/"
},
"data": {
"id": "dbfwfilter",
"type": "module",
"attributes": {
"module_type": "Filter",
"version": "V1.2.0",
"description": "Firewall Filter",
"api": "filter",
"status": "GA",
"commands": [
{
"id": "rules/reload",
"type": "module_command",
"links": {
"self": "http://localhost:8989/v1/modules/dbfwfilter/rules/reload"
},
"attributes": {
"method": "POST",
"arg_min": 1,
"arg_max": 2,
"parameters": [
{
"description": "Filter to reload",
"type": "FILTER",
"required": true
},
{
"description": "Path to rule file",
"type": "[STRING]",
"required": false
}
]
}
}
],
"parameters": [
{
"name": "rules",
"type": "path"
},
{
"name": "log_match",
"type": "bool",
"default_value": "false"
},
{
"name": "log_no_match",
"type": "bool",
"default_value": "false"
},
{
"name": "action",
"type": "enum",
"default_value": "block",
"enum_values": [
"allow",
"block",
"ignore"
]
}
]
},
"links": {
"self": "http://localhost:8989/v1/modules/dbfwfilter"
}
}
}
```
## Get all loaded modules
Retrieve information about all loaded modules.
```
GET /v1/maxscale/modules
```
#### Response
`Status: 200 OK`
```javascript
{
"links": {
"self": "http://localhost:8989/v1/maxscale/modules/"
},
"data": [
{
"id": "qc_sqlite",
"type": "module",
"attributes": {
"module_type": "QueryClassifier",
"version": "V1.0.0",
"description": "Query classifier using sqlite.",
"api": "query_classifier",
"status": "Beta",
"parameters": []
},
"links": {
"self": "http://localhost:8989/v1/modules/qc_sqlite"
}
},
{
"id": "MySQLAuth",
"type": "module",
"attributes": {
"module_type": "Authenticator",
"version": "V1.1.0",
"description": "The MySQL client to MaxScale authenticator implementation",
"api": "authenticator",
"status": "GA",
"parameters": []
},
"links": {
"self": "http://localhost:8989/v1/modules/MySQLAuth"
}
},
]
}
```
## Call a module command
Modules can expose commands that can be called via the REST API. The module
resource lists all commands in the `data.attributes.commands` list. Each value
is a command sub-resource identified by its `id` field and the HTTP method the
command uses is defined by the `attributes.method` field.
The _:module_ in the URI must be a valid name of a loaded module and _:command_
must be a valid command identifier that is exposed by that module. All
parameters to the module commands are passed as HTTP request parameters.
For read-only commands:
```
GET /v1/maxscale/modules/:module/:command
```
For commands that can modify data:
```
POST /v1/maxscale/modules/:module/:command
```
Here is an example POST requests to the dbfwfilter module command _reload_ with
two parameters, the name of the filter instance and the path to a file:
```
POST /v1/maxscale/modules/dbfwfilter/reload?my-dbfwfilter-instance&/path/to/file.txt
```
#### Response
Command with output:
`Status: 200 OK`
```javascript
{
"links": {
"self": "http://localhost:8989/v1/maxscale/modules/dbfwfilter/rules/json"
},
"meta": [
{
"name": "test3",
"type": "COLUMN",
"times_matched": 0
}
]
}
```
The contents of the `meta` field will contain the output of the module
command. This output depends on the command that is being executed. It can
contain any valid JSON value.
Command with no output:
`Status: 204 No Content`
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