Simple Rate Limiter Filter

A basic rate limiter implementation filter for Clyde API gateway, which allows to limit the rate consume.

Implementation is based on limiter module.

• Simple Rate Limiter Filter
  • Installation
  • Configuration
  • Examples
    • Limit global access to 100 req/sec
    • Limit access to a provider to 100 req/sec
    • Limit access to a provider to 100 req/sec and to the userA consumer rate limited to 20 req/sec
  • Notes
• License

Installation

npm install clydeio-simple-rate-limiter --save

Configuration

Rate limiter filter is extremely flexible and allows limit access globally or per consumer. The filter accepts the configuration properties:

• global: Specifies the limits to be applied globally. It must be an object with the properties:

  • tokens: Number of allowed access
  • interval: Interval within the previous accesses are allowed. Allowed values are: sec/second, min/minute, hr/hour and day.

• consumers: Specifies the global limits per consumers. For each consumer and object with tokens and interval properties must be specified.

At least one property must be specified, that is, at least global or consumers must be set.

Examples

Limit global access to 100 req/sec

{
  "prefilters" : [
    {
      "id" : "rate-limiter",
      "path" : "clydeio-simple-rate-limiter",
      "config" : {
        "global" : {
          "tokens" : 100,
          "interval" : "second"
        },
        ...
      }
    }
  ],
  "provider": [
    ...
  ]
}

Limit access to a provider to 100 req/sec

{
  providers: [
    {
      "id": "idProvider",
      "context": "/provider",
      "target": "http://provider_server",
      "prefilters" : [
        {
          "id" : "rate-limiter",
          "path" : "clydeio-simple-rate-limiter",
          "config" : {
            "global" : {
              "tokens" : 100,
              "interval" : "second"
            }
          }
        }
      ]
    }
  ]
}

Limit access to a provider to 100 req/sec and to the userA consumer rate limited to 20 req/sec

{
  providers: [
    {
      "id": "idProvider",
      "context": "/provider",
      "target": "http://provider_server",
      "prefilters" : [
        {
          "id" : "rate-limiter",
          "path" : "clydeio-simple-rate-limiter",
          "config" : {
            "global" : {
              "tokens" : 100,
              "interval" : "second"
            },
            "consumers" : {
              "userA" : {
                "tokens" : 20,
                "interval" : "second"
              }
            }
          }
        }
      ]
    }
  ]
}

Notes

• It has no sense configure the rate limiter filter as a global or provider's postfilter.
• Limits are applied in the order: global and consumers. Be aware when chaining limits.

License

The MIT License (MIT)

Copyright (c) 2015 Antonio Santiago (@acanimal)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.