Match

The Match filter's job is to provide a mechanism to change behaviour based on dynamic metadata. This filter behaves similarly to the match expression in Rust or switch statements in other languages.

Filter name

quilkin.filters.match.v1alpha1.Match

Configuration Examples

#![allow(unused)]
fn main() {
let yaml = "
version: v1alpha1
clusters: 
  default:
    localities:
      - endpoints:
        - address: 127.0.0.1:26000
        - address: 127.0.0.1:26001
filters:
  - name: quilkin.filters.capture.v1alpha1.Capture
    config:
      metadataKey: myapp.com/token
      prefix:
        size: 3
        remove: false
  - name: quilkin.filters.match.v1alpha1.Match
    config:
      on_read:
        metadataKey: myapp.com/token
        branches:
          - value: abc
            name: quilkin.filters.pass.v1alpha1.Pass
        fallthrough:
          name: quilkin.filters.drop.v1alpha1.Drop
";
let config = quilkin::config::Config::from_reader(yaml.as_bytes()).unwrap();
assert_eq!(config.filters.load().len(), 2);
quilkin::Proxy::try_from(config).unwrap();
}

Configuration Options (Rust Doc)

$schema: http://json-schema.org/draft-07/schema#
title: Config
description: Configuration for [`Match`][super::Match].
type: object
properties:
  on_read:
    description: Configuration for [`Filter::read`][crate::filters::Filter::read].
    anyOf:
    - $ref: '#/definitions/DirectionalConfig'
    - type: 'null'
  on_write:
    description: Configuration for [`Filter::write`][crate::filters::Filter::write].
    anyOf:
    - $ref: '#/definitions/DirectionalConfig'
    - type: 'null'
additionalProperties: false
definitions:
  Branch:
    description: A specific match branch. The filter is run when `value` matches the value defined in `metadata_key`.
    type: object
    required:
    - name
    - value
    properties:
      config: true
      name:
        type: string
      value:
        description: The value to compare against the dynamic metadata.
        allOf:
        - $ref: '#/definitions/Value'
  DirectionalConfig:
    description: Configuration for a specific direction.
    type: object
    required:
    - branches
    - metadataKey
    properties:
      branches:
        description: List of filters to compare and potentially run if any match.
        type: array
        items:
          $ref: '#/definitions/Branch'
      fallthrough:
        description: The behaviour for when none of the `branches` match.
        default:
          name: quilkin.filters.drop.v1alpha1.Drop
          config: null
        allOf:
        - $ref: '#/definitions/Filter'
      metadataKey:
        description: The key for the metadata to compare against.
        allOf:
        - $ref: '#/definitions/Key'
  Filter:
    description: Filter is the configuration for a single filter
    type: object
    required:
    - name
    properties:
      config: true
      name:
        type: string
    additionalProperties: false
  Key:
    description: A key in the metadata table.
    type: string
  Value:
    anyOf:
    - type: boolean
    - type: integer
      format: uint64
      minimum: 0.0
    - type: array
      items:
        $ref: '#/definitions/Value'
    - type: string
    - type: array
      items:
        type: integer
        format: uint8
        minimum: 0.0

View the Match filter documentation for more details.

Metrics

• quilkin_filter_Match_packets_matched_total A counter of the total number of packets where the dynamic metadata matches a branch value.
• quilkin_filter_Match_packets_fallthrough_total A counter of the total number of packets that are processed by the fallthrough configuration.