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vmod_bodyaccess

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Varnish Bodyaccess Module

Author:Arianna Aondio
Date:2015-06-18
Version:1.0

SYNOPSIS

import bodyaccess;

DESCRIPTION

Varnish vmod that lets you access the request body.

FUNCTIONS

len_req_body

Prototype
len_req_body()
Return value
INT
Description

Returns the request body length or -1 if an error occurs.

Note that the request body must be buffered.

Example
| std.cache_req_body(1KB);
| set req.http.x-len = bodyaccess.len_req_body();

hash_req_body

Prototype
hash_req_body()
Return value
VOID
Description
Adds available request body bytes to the lookup hash key. Note that this function can only be used in vcl_hash and the request body must be buffered.
Example
| sub vcl_recv {
|     std.cache_req_body(1KB);
| }
|
| sub vcl_hash{
|     bodyaccess.hash_req_body();
| }

rematch_req_body

Prototype
rematch_req_body(PRIV_CALL, STRING re)
Return value
INT
Description

Returns -1 if an error occurrs. Returns 0 if the request body doesn't contain the string re. Returns 1 if the request body contains the string re.

Note that the comparison is case sensitive and the request body must be buffered.

Example
| std.cache_req_body(1KB);
|
| if (bodyaccess.rematch_req_body("FOO") == 1) {
|    std.log("is true");
| }

Find more example in example.vcl.

N.B. The request body must be retrieved before doing any operations on it. It can be buffered using the cache_req_body() function from libvmod_std.

These functions applies only to standard REST methods. Caching is not allowed on PUT requests.

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 example, when varnishd configure was called with --prefix=$PREFIX, use

PKG_CONFIG_PATH=${PREFIX}/lib/pkgconfig export PKG_CONFIG_PATH

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.

COMMON PROBLEMS

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

    Check if PKG_CONFIG_PATH has been set correctly before calling autogen.sh and configure