MappedThrottlingPolicy

Maps different throttling rates to different groups of requests, according to the evaluation of throttlingRateMapper.

Usage

{
    "type": "ThrottlingFilter",
    "config": {
        "requestGroupingPolicy": expression,
        "throttlingRatePolicy": {
            "type": "MappedThrottlingPolicy",
            "config": {
                "throttlingRateMapper": runtime expression<string>,
                "throttlingRatesMapping": {
                    "mapping1": {
                        "numberOfRequests": integer,
                        "duration": duration string
                    },
                    "mapping2": {
                        "numberOfRequests": integer,
                        "duration": duration string
                    }
                },
                "defaultRate": {
                    "numberOfRequests": integer,
                    "duration": duration string
                }
            }
        }
    }
}

Properties

"throttlingRateMapper": runtime expression<string>, required

An expression to categorize requests for mapping to a throttling rate in the throttlingRatesMapping.

If this parameter is null or does not match any specified mappings, the default throttling rate is applied.

"throttlingRatesMapping": object, required

A map of throttling rate by request group. Requests are categorized into groups by the evaluation of the expression "throttlingRateMapper".

"mapping1" and "mapping2": string, required

The evaluation of the expression "throttlingRateMapper".

The number of mappings is not limited to two.

"numberOfRequests": integer, required

The number of requests allowed through the filter in the time specified by "duration".

"duration": duration string, required

A time interval during which the number of requests passing through the filter is counted.

For information about supported formats for duration, see duration.

"defaultRate": object, required

The default throttling rate to apply if the evaluation of the expression "throttlingRateMapper" is null or is not mapped to a throttling rate.

"numberOfRequests": integer, required

The number of requests allowed through the filter in the time specified by "duration".

"duration": duration string, required

A time interval during which the number of requests passing through the filter is counted.

For information about supported formats for duration, see duration.

Example of a Mapped Throttling Policy

In the following example, requests from users with different statuses are mapped to different throttling rates. For information about how to set up and test this example, see "Configuring Mapped Throttling". 

{
  "name": "00-throttle-mapped",
  "baseURI": "http://app.example.com:8081",
  "condition": "${matches(request.uri.path, '^/home/throttle-mapped')}",
  "heap": [
    {
      "name": "SystemAndEnvSecretStore-1",
      "type": "SystemAndEnvSecretStore"
    },
    {
      "name": "AmService-1",
      "type": "AmService",
      "config": {
        "agent": {
          "username": "ig_agent",
          "passwordSecretId": "agent.secret.id"
        },
        "secretsProvider": "SystemAndEnvSecretStore-1",
        "url": "http://openam.example.com:8088/openam/",
        "version": "7"
      }
    }
  ],
  "handler": {
    "type": "Chain",
    "config": {
      "filters": [
        {
          "name": "OAuth2ResourceServerFilter-1",
          "type": "OAuth2ResourceServerFilter",
          "config": {
            "scopes": [
              "mail",
              "employeenumber"
            ],
            "requireHttps": false,
            "realm": "OpenIG",
            "accessTokenResolver": {
              "name": "token-resolver-1",
              "type": "TokenIntrospectionAccessTokenResolver",
              "config": {
                "amService": "AmService-1",
                "providerHandler": {
                  "type": "Chain",
                  "config": {
                    "filters": [
                      {
                        "type": "HttpBasicAuthenticationClientFilter",
                        "config": {
                          "username": "ig_agent",
                          "passwordSecretId": "agent.secret.id",
                          "secretsProvider": "SystemAndEnvSecretStore-1"
                        }
                      }
                    ],
                    "handler": "ForgeRockClientHandler"
                  }
                }
              }
            }
          }
        },
        {
          "name": "ThrottlingFilter-1",
          "type": "ThrottlingFilter",
          "config": {
            "requestGroupingPolicy": "${contexts.oauth2.accessToken.info.mail}",
            "throttlingRatePolicy": {
              "name": "MappedPolicy",
              "type": "MappedThrottlingPolicy",
              "config": {
                "throttlingRateMapper": "${contexts.oauth2.accessToken.info.status}",
                "throttlingRatesMapping": {
                  "gold": {
                    "numberOfRequests": 6,
                    "duration": "10 s"
                  },
                  "silver": {
                    "numberOfRequests": 3,
                    "duration": "10 s"
                  },
                  "bronze": {
                    "numberOfRequests": 1,
                    "duration": "10 s"
                  }
                },
                "defaultRate": {
                  "numberOfRequests": 1,
                  "duration": "10 s"
                }
              }
            }
          }
        }
      ],
      "handler": "ReverseProxyHandler"
    }
  }
}
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