MaxScale 21.06 Filter Resource

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Filter Resource

A filter resource represents an instance of a filter inside MaxScale. Multiple services can use the same filter and a single service can use multiple filters.

Resource Operations

The :name in all of the URIs must be the name of a filter in MaxScale.

Get a filter

Get a single filter.

GET /v1/filters/:name

Response

Status: 200 OK

{
    "data": {
        "attributes": {
            "filter_diagnostics": null,
            "module": "qlafilter",
            "parameters": {
                "append": false,
                "duration_unit": "ms",
                "exclude": null,
                "filebase": "/tmp/qla.log",
                "flush": true,
                "log_data": "date,user,query",
                "log_type": "unified",
                "match": null,
                "module": "qlafilter",
                "newline_replacement": " ",
                "options": "",
                "separator": ",",
                "source": null,
                "use_canonical_form": false,
                "user": null
            },
            "source": {
                "file": "/etc/maxscale.cnf",
                "type": "static"
            }
        },
        "id": "QLA",
        "links": {
            "self": "http://localhost:8989/v1/filters/QLA/"
        },
        "relationships": {
            "services": {
                "data": [
                    {
                        "id": "Read-Connection-Router",
                        "type": "services"
                    }
                ],
                "links": {
                    "related": "http://localhost:8989/v1/services/",
                    "self": "http://localhost:8989/v1/filters/QLA/relationships/services/"
                }
            }
        },
        "type": "filters"
    },
    "links": {
        "self": "http://localhost:8989/v1/filters/QLA/"
    }
}

Get all filters

Get all filters.

GET /v1/filters

Response

Status: 200 OK

{
    "data": [
        {
            "attributes": {
                "module": "hintfilter",
                "parameters": {
                    "module": "hintfilter"
                },
                "source": {
                    "file": "/etc/maxscale.cnf",
                    "type": "static"
                }
            },
            "id": "Hint",
            "links": {
                "self": "http://localhost:8989/v1/filters/Hint/"
            },
            "relationships": {
                "services": {
                    "data": [
                        {
                            "id": "Read-Connection-Router",
                            "type": "services"
                        }
                    ],
                    "links": {
                        "related": "http://localhost:8989/v1/services/",
                        "self": "http://localhost:8989/v1/filters/Hint/relationships/services/"
                    }
                }
            },
            "type": "filters"
        },
        {
            "attributes": {
                "filter_diagnostics": null,
                "module": "qlafilter",
                "parameters": {
                    "append": false,
                    "duration_unit": "ms",
                    "exclude": null,
                    "filebase": "/tmp/qla.log",
                    "flush": true,
                    "log_data": "date,user,query",
                    "log_type": "unified",
                    "match": null,
                    "module": "qlafilter",
                    "newline_replacement": " ",
                    "options": "",
                    "separator": ",",
                    "source": null,
                    "use_canonical_form": false,
                    "user": null
                },
                "source": {
                    "file": "/etc/maxscale.cnf",
                    "type": "static"
                }
            },
            "id": "QLA",
            "links": {
                "self": "http://localhost:8989/v1/filters/QLA/"
            },
            "relationships": {
                "services": {
                    "data": [
                        {
                            "id": "Read-Connection-Router",
                            "type": "services"
                        }
                    ],
                    "links": {
                        "related": "http://localhost:8989/v1/services/",
                        "self": "http://localhost:8989/v1/filters/QLA/relationships/services/"
                    }
                }
            },
            "type": "filters"
        }
    ],
    "links": {
        "self": "http://localhost:8989/v1/filters/"
    }
}

Create a filter

POST /v1/filters

Create a new filter. The posted object must define at least the following fields.

  • data.id
  • Name of the filter

  • data.type

  • Type of the object, must be filters

  • data.atttributes.module

  • The filter module to use

All of the filter parameters should be defined at creation time in the data.atttributes.parameters object.

As the service to filter relationship is ordered (filters are applied in the order they are listed), filter to service relationships cannot be defined at creation time.

The following example defines a request body which creates a new filter.

{
    "data": {
        "id": "test-filter", // Name of the filter
        "type": "filters",
        "attributes": {
            "module": "qlafilter", // The filter uses the qlafilter module
            "parameters": { // Filter parameters
                "filebase": "/tmp/qla.log"
            }
        }
    }
}

Response

Filter is created:

Status: 204 No Content

Update a filter

PATCH /v1/filters/:name

Filter parameters can be updated at runtime if the module supports it. Refer to the individual module documentation for more details on whether it supports runtime configuration and which parameters can be updated.

The following example modifies a filter by changing the match parameter to .*users.*.

{
    "data": {
        "attributes": {
            "parameters": {
                "match": ".*users.*"
            }
        }
    }
}

Response

Filter is modified:

Status: 204 No Content

Destroy a filter

DELETE /v1/filters/:filter

The :filter in the URI must map to the name of the filter to be destroyed.

A filter can only be destroyed if no service uses it. This means that the data.relationships object for the filter must be empty. Note that the service → filter relationship cannot be modified from the filters resource and must be done via the services resource.

This endpoint also supports the force=yes parameter that will unconditionally delete the filter by first removing it from all services that it uses.

Response

Filter is destroyed:

Status: 204 No Content

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