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Kong Service Virtualization

This plugin will enable mocking virtual API request and response pairs through Kong Gateway.

Terminology

  • plugin: a plugin executing actions inside Kong before or after a request has been proxied to the upstream API.
  • Service: the Kong entity representing an external upstream API or microservice.
  • Route: the Kong entity representing a way to map downstream requests to upstream services.
  • upstream service: this refers to your own API/service sitting behind Kong, to which client requests are forwarded.
  • API: a legacy entity used to represent your upstream services. Deprecated in favor of Services since CE 0.13.0 and EE 0.32.

Configuration

Enabling the plugin on a Service

With a database

Configure this plugin on a Service by making the following request:

$ curl -X POST http://kong:8001/services/{service}/plugins \
    --data "name=kong-service-virtualization"  \
    --data "config.virtual_tests={"name"=>"TestCase1", "requestHttpMethod"=>"POST", "requestHash"=>"0296217561490155228da9c17fc555cf9db82d159732f3206638c25f04a285c4", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkEgQmlnIFN1Y2Nlc3MhIn0="}" \
    --data "config.virtual_tests={"name"=>"TestCase2", "requestHttpMethod"=>"GET", "requestHash"=>"e2c319e4ef41706e2c0c1b266c62cad607a014c59597ba662bef6d10a0b64a32", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkFub3RoZXIgU3VjY2VzcyEifQ=="}"

Without a database

Configure this plugin on a Service by adding this section do your declarative configuration file:

plugins:
- name: kong-service-virtualization
  service: {service}
  config: 
    virtual_tests:
    - {"name"=>"TestCase1", "requestHttpMethod"=>"POST", "requestHash"=>"0296217561490155228da9c17fc555cf9db82d159732f3206638c25f04a285c4", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkEgQmlnIFN1Y2Nlc3MhIn0="}
    - {"name"=>"TestCase2", "requestHttpMethod"=>"GET", "requestHash"=>"e2c319e4ef41706e2c0c1b266c62cad607a014c59597ba662bef6d10a0b64a32", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkFub3RoZXIgU3VjY2VzcyEifQ=="}

{service} is the id or name of the Service that this plugin configuration will target.

Enabling the plugin on a Route

With a database

Configure this plugin on a Route with:

$ curl -X POST http://kong:8001/routes/{route}/plugins \
    --data "name=kong-service-virtualization"  \
    --data "config.virtual_tests={"name"=>"TestCase1", "requestHttpMethod"=>"POST", "requestHash"=>"0296217561490155228da9c17fc555cf9db82d159732f3206638c25f04a285c4", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkEgQmlnIFN1Y2Nlc3MhIn0="}" \
    --data "config.virtual_tests={"name"=>"TestCase2", "requestHttpMethod"=>"GET", "requestHash"=>"e2c319e4ef41706e2c0c1b266c62cad607a014c59597ba662bef6d10a0b64a32", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkFub3RoZXIgU3VjY2VzcyEifQ=="}"

Without a database

Configure this plugin on a Route by adding this section do your declarative configuration file:

plugins:
- name: kong-service-virtualization
  route: {route}
  config: 
    virtual_tests:
    - {"name"=>"TestCase1", "requestHttpMethod"=>"POST", "requestHash"=>"0296217561490155228da9c17fc555cf9db82d159732f3206638c25f04a285c4", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkEgQmlnIFN1Y2Nlc3MhIn0="}
    - {"name"=>"TestCase2", "requestHttpMethod"=>"GET", "requestHash"=>"e2c319e4ef41706e2c0c1b266c62cad607a014c59597ba662bef6d10a0b64a32", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkFub3RoZXIgU3VjY2VzcyEifQ=="}

{route} is the id or name of the Route that this plugin configuration will target.

Enabling the plugin on an API

If you are using an older version of Kong with the legacy API entity (deprecated in favor of Services since CE 0.13.0 and EE 0.32.), you can configure this plugin on top of such an API by making the following request:

$ curl -X POST http://kong:8001/apis/{api}/plugins \
    --data "name=kong-service-virtualization"  \
    --data "config.virtual_tests={"name"=>"TestCase1", "requestHttpMethod"=>"POST", "requestHash"=>"0296217561490155228da9c17fc555cf9db82d159732f3206638c25f04a285c4", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkEgQmlnIFN1Y2Nlc3MhIn0="}" \
    --data "config.virtual_tests={"name"=>"TestCase2", "requestHttpMethod"=>"GET", "requestHash"=>"e2c319e4ef41706e2c0c1b266c62cad607a014c59597ba662bef6d10a0b64a32", "responseHttpStatus"=>"200", "responseContentType"=>"application/json", "response"=>"eyJtZXNzYWdlIjogIkFub3RoZXIgU3VjY2VzcyEifQ=="}"
  • api: either id or name of the API that this plugin configuration will target.

Global plugins

  • Using a database, all plugins can be configured using the http://kong:8001/plugins/ endpoint.
  • Without a database, all plugins can be configured via the plugins: entry on the declarative configuration file.

A plugin which is not associated to any Service, Route or Consumer (or API, if you are using an older version of Kong) is considered "global", and will be run on every request. Read the Plugin Reference and the Plugin Precedence sections for more information.

Parameters

Here's a list of all the parameters which can be used in this plugin's configuration:

form parameterdescription
nameThe name of the plugin to use, in this case kong-service-virtualization
service.idThe ID of the Service the plugin targets.
route.idThe ID of the Route the plugin targets.
enabled

default value: true		Whether this plugin will be applied.
api_idThe id of the API which this plugin will target. Note: The API Entity is deprecated in favor of Services since CE 0.13.0 and EE 0.32.
config.virtual_tests

A JSON array as string representation of the plugin’s configurable fields.

name JSON represents a human readable test case name

requestHttpMethod JSON represents the HTTP method associated to the virtual request

requestHash JSON represents the Sha256 of the HTTP Body or QUERY Parameters of your request

responseHttpStatus JSON represents the HTTP response to send consumers after successful virtual match

responseContentType JSON represents the Content-Type of the HTTP response after successful virtual request match

response JSON represents the Base64 encoded virtual response to send after successful virtual request match

Overview

This plugin will enable mocking virtual API request and response pairs through Kong Gateway.

Explanation

kong-service-virtualization schema virtual_tests arguments:

[
     {
           "name": "TestCase1",           
           "requestHttpMethod": "POST",
           "requestHash": "0296217561490155228da9c17fc555cf9db82d159732f3206638c25f04a285c4",
           "responseHttpStatus": "200",
           "responseContentType": "application/json",
           "response": "eyJtZXNzYWdlIjogIkEgQmlnIFN1Y2Nlc3MhIn0="
    },
    {         
           "name": "TestCase2",           
           "requestHttpMethod": "GET",
           "requestHash": "e2c319e4ef41706e2c0c1b266c62cad607a014c59597ba662bef6d10a0b64a32",
           "responseHttpStatus": "200",
           "responseContentType": "application/json",
           "response": "eyJtZXNzYWdlIjogIkFub3RoZXIgU3VjY2VzcyEifQ=="
    }
]

Where TestCase1 and TestCase2 are the names of the virtual test cases and must be passed in as a header value:

X-VirtualRequest: TestCase1

or

X-VirtualRequest: TestCase2

The requestHash arg is a Sha256(HTTP Request as query parameters or HTTP Body). The response arg is a Base64 encoded format of the response HTTP Body.

So the above plugin equates to these pseudo requests:

https://gateway.company.com/virtualtest

POST:
{
   "virtual": "test"
}
Response : {"message": "A Big Success!"} as base64 encoded in plugin

GET:
hello=world&service=virtualized
Response : {"message": "Another Success!"} as base4 encoded in plugin

In the event you do not successfully match on request you will receive a Sha256 comparison for you own personal debugging:

Status Code: 404 Not Found
Content-Length: 207
Content-Type: application/json; charset=utf-8

{"message":"No virtual request match found, your request yielded: 46c4b4caf0cc3a5a589cbc4e0f3cd0492985d5b889f19ebc11e5a5bd6454d20f expected 0296217561490155228da9c17fc555cf9db82d159732f3206638c25f04a285c4"}

If the test case specified in the header does not match anything found stored within the plugin your error would be like so: Passing X-VirtualRequest: TestCase3 in header yields:

Status Code: 404 Not Found
Content-Length: 49
Content-Type: application/json; charset=utf-8

{"message":"No matching virtual request found!"}

Installation

Recommended:

$ luarocks install kong-service-virtualization

Optional:

$ git clone https://github.com/Optum/kong-service-virtualization
$ cd /path/to/kong/plugins/kong-service-virtualization
$ luarocks make *.rockspec

Maintainers

jeremyjpj0916
rsbrisci

Feel free to open issues, or refer to our Contribution Guidelines if you have any questions.