axios-version

Validating service version from response headers for axios

Install

npm install -S axios-version

Use

Imagine that a server returns its name and version in response headers, for example using koa-version-header. This package allows you to validate that the server is running the version we expect and trust.

Set the allowed service versions in package.json, for example in this package for the demo I use the following

{
  "config": {
    "services": {
      "demo-server": "1.2.*"
    }
  }
}

I recommend preloading this package when running your module. For example, if you typically run node index.js you should run like this instead

node -r axios-version index.js

If you want to debug the interceptors and the version login, run with environment variable

DEBUG=ver node -r axios-version index.js

Demo

Start demo server in one tab

$ node demo/server.js

Run client from another tab

$ npm run demo-client
 
> axios-version@0.0.0-semantic-release demo-client /git/axios-version
> DEBUG=ver NODE_PATH=.. node -r axios-version demo/client.js
 
  ver installed axios interceptor for +0ms [ 'demo-server' ]
  ver validating response from +53ms http://localhost:3000
  ver got response from demo-server@1.2.0 +2ms
  ver demo-server@1.2.0 satisfies 1.2.*? true +3ms
service demo-server@1.2.0 says ok

The server demo-server@1.2.0 is allowed in the response. Now change the package.json file and require demo-server@1.3.0 for example

{
  "config": {
    "services": {
      "demo-server": "1.3.*"
    }
  }
}

$ npm run demo-client
 
> axios-version@0.0.0-semantic-release demo-client /git/axios-version
> DEBUG=ver NODE_PATH=.. node -r axios-version demo/client.js
 
  ver installed axios interceptor for +0ms [ 'demo-server' ]
  ver validating response from +46ms http://localhost:3000
  ver got response from demo-server@1.2.0 +1ms
  ver demo-server@1.2.0 satisfies 1.3.0? false +3ms
[Error: Service version mismatch]

The response no longer works because the run time service has "wrong" version that we do not trust yet.

Small print

Author: Gleb Bahmutov <[e-mail]> © 2016

• @bahmutov
• glebbahmutov.com
• blog

License: MIT - do anything with the code, but don't blame me if it does not work.

Support: if you find any problems with this module, email / tweet / open issue on Github

MIT License

Copyright (c) 2016 Gleb Bahmutov <[e-mail]>

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.