DDevelopment & Design

New HTTP Logger Grails plugin

I’ve wrote a new Grails plugin – httplogger. It logs: request information (url, headers, cookies, method, body), grails dispatch information (controller, action, parameters), response information (elapsed time and body). It is mostly useful for logging your REST traffic. Full HTTP web pages can be huge to log and generally waste your space. I suggest to map all of your REST controllers with the same path in UrlMappings, e.g. /rest/ and configure this plugin with this path. Here is some simple output just to give you a taste of it. 17:16:00,331 INFO filters.LogRawRequestInfoFilter - 17:16:00,340 INFO filters.LogRawRequestInfoFilter - 17:16:00,342 INFO filters.LogGrailsUrlsInfoFilter - 17:16:00,731 INFO filters.LogOutputResponseFilter - >> #1 returned 200, took 405 ms.17:16:00,745 INFO filters.LogOutputResponseFilter - >> #1 responded with '{count:0}' 17:18:55,799 INFO filters.LogRawRequestInfoFilter - 17:18:55,799 INFO filters.LogRawRequestInfoFilter - 17:18:55,800 INFO filters.LogRawRequestInfoFilter - 17:18:55,801 INFO filters.LogOutputResponseFilter - >> #2 returned 404, took 3 ms.17:18:55,802 INFO filters.LogOutputResponseFilter - >> #2 responded with '' Official plugin information can be found on Grails plugins website here: http://grails.org/plugins/httplogger or you can browse code on github: TouK/grails-httplogger.

I’ve wrote a new Grails plugin – httplogger. It logs:

  • request information (url, headers, cookies, method, body),
  • grails dispatch information (controller, action, parameters),
  • response information (elapsed time and body).

It is mostly useful for logging your REST traffic. Full HTTP web pages can be huge to log and generally waste your space. I suggest to map all of your REST controllers with the same path in <span class="class">UrlMappings</span>, e.g. /rest/ and configure this plugin with this path.

Here is some simple output just to give you a taste of it.

17:16:00,331 INFO  filters.LogRawRequestInfoFilter  - << #1 GET http://localhost:8080/riddle/rest/index?username=admin&search=foo<br />17:16:00,340 INFO  filters.LogRawRequestInfoFilter  - << #1 headers Cookie: 'JSESSIONID=DF4EA5725AC4A4990281BD96963739B0; splashShown1.6=1', Accept-Language: 'en-US,en;q=0.8,pl;q=0.6', X-MyHeader: 'null'<br />17:16:00,342 INFO  filters.LogGrailsUrlsInfoFilter  - << #1 dispatched to rest/index with parsed params [username:[admin], search:[foo]].<br />17:16:00,731 INFO  filters.LogOutputResponseFilter  - >> #1 returned 200, took 405 ms.<br />17:16:00,745 INFO  filters.LogOutputResponseFilter  - >> #1 responded with '{count:0}'

17:18:55,799 INFO  filters.LogRawRequestInfoFilter  - << #2 POST http://localhost:8080/riddle/rest/login<br />17:18:55,799 INFO  filters.LogRawRequestInfoFilter  - << #2 headers Cookie: 'JSESSIONID=DF4EA5725AC4A4990281BD96963739B0; splashShown1.6=1', Accept-Language: 'en-US,en;q=0.8,pl;q=0.6', X-MyHeader: 'null'<br />17:18:55,800 INFO  filters.LogRawRequestInfoFilter  - << #2 body: 'username=admin&password=password'<br />17:18:55,801 INFO  filters.LogOutputResponseFilter  - >> #2 returned 404, took 3 ms.<br />17:18:55,802 INFO  filters.LogOutputResponseFilter  - >> #2 responded with ''

Official plugin information can be found on Grails plugins website here: http://grails.org/plugins/httplogger or you can browse code on github: TouK/grails-httplogger.

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DDevelopment & Design

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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.