DDevelopment & Design

Meet Sputnik – static code analyser for Gerrit

Sputnik runs Checkstyle, PMD and FindBugs for your Gerrit patchsets I am happy to announce a first release of Sputnik! It is a static code analyzer that runs Checkstyle, PMD and FindBugs for your Gerrit patchsets. Its main advantage over my previous pr…

Sputnik runs Checkstyle, PMD and FindBugs for your Gerrit patchsets

I am happy to announce a first release of Sputnik! It is a static code analyzer that runs Checkstyle, PMD and FindBugs for your Gerrit patchsets. Its main advantage over my previous project Sonar Gerrit plugin is that Sputnik is a small, lightweight and standalone Java application. You don’t need any other software to run it. It bundles Checkstyle, PMD and FindBugs jars within distribution zip.

Workflow

Sputnik is intended to use with Gerrit and Continous Integration server, i. e. Jenkins. It works like this:

Your CI server is updated by ssh that a new patch is submitted to Gerrit. CI fetches this patch and builds a while project. After a build, CI server reports its result to Gerrit. It’s time for Sputnik now.

Sputnik runs regardless of build result (you can change that in your CI configuration). Sputnik fetches patchset’s file list from Gerrit over HTTP REST API. Then it runs an analysis only on these files! Even if your project is huge, analysis on several files takes only seconds. Sputnik collects comments from all three analysers: Checkstyle, PMD and FindBugs. It sends back all comments to Gerrit via HTTP REST API back. It’s very simple and very fast!

Installation and configuration

First, you need to build https://github.com/TouK/sputnik master or download distribution zip from here: sputnik-1.0.zip. Go to you CI server and extract it to a directory of your choice. Remember that a user you run CI builds needs to have an access rights to this directory (in my case it’s simply a jenkins user). Then you need to prepare your configuration file and write this file to the same directory as unzipped distribution. It is a simple Java properties file, which is pretty self-explanatory. Here is an example:

gerrit.host=gerrit.yourcompany.com
gerrit.port=8080
gerrit.username=sputnik
gerrit.password=Pa$$wo4d
checkstyle.enabled=true
checkstyle.configurationFile=/opt/jenkins/sputnik/checkstyle.xml
checkstyle.propertiesFile=
pmd.enabled=true
pmd.ruleSets=/opt/jenkins/sputnik/pmd.xml
findbugs.enabled=true
findbugs.includeFilter=/opt/jenkins/sputnik/findbugs.xml
findbugs.excludeFilter=

Now you need to configure you CI server to actually run Sputnik after a build. It is very simple for Jenkins, just add a Post-Build Step. You can adjust if Sputnik runs only on successful build or for every build – use radio buttons for this:

Last line with exit 0 is a workaround for a clean exit, even if Sputnik fails for some reason. Exit 0 guarantees you that result of this step doesn’t affect overall build result.

Summary

This is an example screenshot of Sputnik’s comments:

Sputnik always reports +1 as a result. It can be lacking in some network and authorisation configuration. But it’s open source so please submit issues and patches to its github page: https://github.com/TouK/sputnik.

Your feedback and pull requests are heartly welcome!

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DDevelopment & Design

Need to make a quick json fixes – JSONPath for rescue

From time to time I have a need to do some fixes in my json data. In a world of flat files I do this with grep/sed/awk tool chain. How to handle it for JSON? Searching for a solution I came across the JSONPath. It quite mature tool (from 2007) but I haven't hear about it so I decided to share my experience with others.

First of all you can try it without pain online: http://jsonpath.curiousconcept.com/. Full syntax is described at http://goessner.net/articles/JsonPath/



But also you can download python binding and run it from command line:
$ sudo apt-get install python-jsonpath-rw
$ sudo apt-get install python-setuptools
$ sudo easy_install -U jsonpath

After that you can use inside python or with simple cli wrapper:
#!/usr/bin/python
import sys, json, jsonpath

path = sys.argv[1]

result = jsonpath.jsonpath(json.load(sys.stdin), path)
print json.dumps(result, indent=2)

… you can use it in your shell e.g. for json:
{
"store": {
"book": [
      {
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
      },
      {
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
      },
      {
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
      },
      {
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
      }
    ],
"bicycle": {
"color": "red",
"price": 19.95
    }
  }
}

You can print only book nodes with price lower than 10 by:
$ jsonpath '$..book[?(@.price

Result:
[
  {
"category": "reference",
"price": 8.95,
"title": "Sayings of the Century",
"author": "Nigel Rees"
  },
  {
"category": "fiction",
"price": 8.99,
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"author": "Herman Melville"
  }
]

Have a nice JSON hacking!From time to time I have a need to do some fixes in my json data. In a world of flat files I do this with grep/sed/awk tool chain. How to handle it for JSON? Searching for a solution I came across the JSONPath. It quite mature tool (from 2007) but I haven't hear about it so I decided to share my experience with others.