istio-config-validator

The istio-config-validator tool is a Work In Progress project.

It provides to developers and cluster operators a way to test their changes in VirtualServices. We do it by mocking Istio/Envoy behavior to decide to which destination the request would go to. Eg:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: example
  namespace: example
spec:
  hosts:
    - www.example.com
    - example.com
  http:
    - match:
        - uri:
            regex: /users(/.*)?
          headers:
            x-user-type:
              exact: qa
      route:
        - destination:
            host: users.users.svc.cluster.local
            port:
              number: 80
    - route:
        - destination:
            host: monolith.monolith.svc.cluster.local

Given the above VirtualService, developers can introduce test cases that covers the intended behavior as the following:

testCases:
  - description: Only QA users should go to the new Users microservice.
    wantMatch: true
    request:
      authority: ["www.example.com", "example.com"]
      method: ["GET", "OPTIONS", "POST"]
      uri: ["/users", "/users/"]
      headers:
        x-user-type: qa
    route:
    - destination:
        host: users.users.svc.cluster.local
        port:
          number: 80
  - description: Fallback other user types to the monolith
    wantMatch: true
    request:
      authority: ["www.example.com", "example.com"]
      method: ["GET", "OPTIONS", "POST"]
      uri: ["/users", "/users/"]
    route:
    - destination:
        host: monolith.monolith.svc.cluster.local

Have a look in the TestCase Reference to learn more how to define the tests.

Installation

Either install the go package

# go install github.com/getyourguide/istio-config-validator/cmd/istio-config-validator@latest

Or alternatively install the docker image

# docker pull getyourguide/istio-config-validator:latest

Usage

# istio-config-validator -h
Usage: istio-config-validator -t <testcases1.yml|testcasesdir1> [-t <testcases2.yml|testcasesdir2> ...] <istioconfig1.yml|istioconfigdir1> [<istioconfig2.yml|istioconfigdir2> ...]

  -t value
        Testcase files/folders

# istio-config-validator -t examples/virtualservice_test.yml examples/virtualservice.yml
2020-05-29T18:45:39.261018Z     info    running test: happy path users
2020-05-29T18:45:39.261106Z     info    PASS input:[{www.example.com GET /users map[x-user-id:abc123]}]
2020-05-29T18:45:39.261128Z     info    PASS input:[{www.example.com GET /users/ map[x-user-id:abc123]}]
2020-05-29T18:45:39.261141Z     info    PASS input:[{www.example.com POST /users map[x-user-id:abc123]}]
2020-05-29T18:45:39.261157Z     info    PASS input:[{www.example.com POST /users/ map[x-user-id:abc123]}]
2020-05-29T18:45:39.261169Z     info    PASS input:[{example.com GET /users map[x-user-id:abc123]}]
2020-05-29T18:45:39.261184Z     info    PASS input:[{example.com GET /users/ map[x-user-id:abc123]}]
2020-05-29T18:45:39.261207Z     info    PASS input:[{example.com POST /users map[x-user-id:abc123]}]
2020-05-29T18:45:39.261220Z     info    PASS input:[{example.com POST /users/ map[x-user-id:abc123]}]
===========================
2020-05-29T18:45:39.261228Z     info    running test: Partner service only accepts GET or OPTIONS
2020-05-29T18:45:39.261256Z     info    PASS input:[{example.com PUT /partners map[]}]
2020-05-29T18:45:39.261274Z     info    PASS input:[{example.com PUT /partners/1 map[]}]
2020-05-29T18:45:39.261284Z     info    PASS input:[{example.com POST /partners map[]}]
2020-05-29T18:45:39.261900Z     info    PASS input:[{example.com POST /partners/1 map[]}]
2020-05-29T18:45:39.261940Z     info    PASS input:[{example.com PATCH /partners map[]}]
2020-05-29T18:45:39.261984Z     info    PASS input:[{example.com PATCH /partners/1 map[]}]
===========================

Contributing

If you're interested in contributing to this project or running a dev version, have a look into the CONTRIBUTING document

Known Limitations

The API for test cases does not cover all aspects of VirtualServices.

• Supported HTTPMatchRequests fields to match requests against are: authority, method, headers and uri.

  • Not supported ones: scheme, port, queryParams, etc.

• Supported assert against HTTPRouteDestination and HTTPRewrite

  • Not supported ones: HTTPRedirect, etc.

Security

For sensitive security matters please contact [email protected].

Legal

Copyright 2020 GetYourGuide GmbH.

istio-config-validator is licensed under the Apache License, Version 2.0. See LICENSE for the full text.