vmod-jsonparser

USAGE

In your VCL you could then use this vmod along the following lines:

import jsonparser;

sub vcl_deliver {
        set resp.http.hello = jsonparser.parseJson("user",{" { "user" : "osakech" , "role" : "admin" } "});
        # resp.http.hello -> is set to "osakech"
}

DESCRIPTION

jsonparser is a simple json parser for varnish that can do only one thing: get you the value for your specified key out of a jsonstring. It has ony one function "jsonparse" (which should probably be renamed to getValue) , no bells and whistless whatsover.

It should also not be used for any production systems at this stage, unless you know what you're doing and you have red and understood the code and agree with what i am doing.

No memory or cpu profilling has been done, so I don't know how it handles big json strings or if does it very efficiently. This module has a very narrow and specific use case, without a lot of unknowns.

In other words, I just wanted to put it out there and slowly improve it. :-)

FUNCTIONS

parseJson

parseJson(STRING key,STRING jsonString)

Return value

STRING

Description

Parses the JSON string jsonString and returns the value associated to the key.

INSTALLATION

The source tree is based on autotools to configure the building, and does also have the necessary bits in place to do functional unit tests using the varnishtest tool.

Building requires the Varnish header files and uses pkg-config to find the necessary paths.

Usage:

./autogen.sh
./configure

If you have installed Varnish to a non-standard directory, call autogen.sh and configure with PKG_CONFIG_PATH pointing to the appropriate path. For instance, when varnishd configure was called with --prefix=$PREFIX, use

export PKG_CONFIG_PATH=${PREFIX}/lib/pkgconfig
export ACLOCAL_PATH=${PREFIX}/share/aclocal

The module will inherit its prefix from Varnish, unless you specify a different --prefix when running the configure script for this module.

Make targets:

• make - builds the vmod.
• make install - installs your vmod.
• make check - runs the unit tests in src/tests/*.vtc.
• make distcheck - run check and prepare a tarball of the vmod.

If you build a dist tarball, you don't need any of the autotools or pkg-config. You can build the module simply by running:

./configure
make

Installation directories

By default, the vmod configure script installs the built vmod in the directory relevant to the prefix. The vmod installation directory can be overridden by passing the vmoddir variable to make install.

COMMON PROBLEMS

• configure: error: Need varnish.m4 -- see README.rst

  Check whether PKG_CONFIG_PATH and ACLOCAL_PATH were set correctly before calling autogen.sh and configure