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Short Description
mod_dims
Full Description

Dependencies

  • Apache 2.2.x
  • Imagemagick 6.6+
  • libcurl 7.18.0+

Compiling

./autorun.sh --with-imagemagick=/path/to/imagemagick --with-apache=/path/to/apache

The paths provided above are prefix paths used to install those dependencies. If you installed
Imagemagick and Apache (including APR) in /usr/local you would run:

./autorun.sh --with-imagemagick=/usr/local --with-apache=/usr/local

Installation

Add the following to the Apache configuration:

<IfModule !mod_dims.c>
    LoadModule dims_module modules/mod_dims.so
</IfModule>

AddHandler dims-local .gif .jpg

<Location /dims/>
    SetHandler dims
</Location>

<Location /dims3/>
    SetHandler dims3
</Location>

<Location /dims-status/>
    SetHandler dims-status
</Location>

This assumes mod_dims.so has been installed in $HTTP_ROOT/modules.

Errors

There are three classes of errors in mod_dims;

  • Errors caused during downloading of a source image. These
    come directly from libcurl and are logged as-is.

  • Errors caused during an ImageMagick operation. These come
    directly from ImageMagik and are logged as-is.

  • Errors caused during processing of a request by mod_dims. These
    fall into the category of bad input checking, bad config, etc.

ImageMagick Timeout Error Format:

[client <client ip address> Imagemagick operation, '<operation>', timed out after 4 ms

<operation> would be something like "Resize/Image" or "Save/Image".

General Error Format:

Errors will be in the following format in Apache's error log:

[client <client ip address>] <source> error, '<source error message>', on request: <request uri>

For example:

[client 10.181.182.244] Imagemagick error, 'no decode delegate for this image
format `'', on request: /20080803WI55426251_WI.jpg/TEST/thumbnail/78x100/

Common libcurl Error Messages:

These message are usually self explanatory so no explain is provided. The
URL that failed will be logged along with this message.

  • Couldn't connect to server
  • Couldn't resolve DNS
  • Timeout was reached

Common mod_dims Error Messages:

  • Requested URL has hostname that is not in the whitelist. (aaolcdn.com)
  • Application ID is not valid
  • Parsing thumbnail geometry failed
  • Parsing crop geometry failed
  • Failed to read image
    This occurs if ImageMagick had trouble reading the image.
  • Unable to stat image file
    This occurs when a local request is unable to find the image to resize.

Common ImageMagick Error Messages:

  • Memory allocation failed
    This should rarely occur, if ever, but usually when it does it's the result
    of an ImageMagick timeout.

  • unrecognized image format

  • no decode delegate for this image format

    This happens when ImageMagick doesn't no how to read a source image.

  • zero-length blob not permitted

    This may occur if there was a failure to download the source image.

  • Unsupported marker type 0x03
    This may occur if the image is corrupted. The "0x03" may be different
    depending on the corruption.

Other more serious errors:

Any errors that have "Assertion failed" are results of bugs in the code and
can be considered serious.

  • Assertion failed: (wand->signature == WandSignature),
    function MagickGetImageFormat, file wand/magick-image.c, line 4137.
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