PDF to image conversion does not work for remote file wrappers (like S3 storage) [#2638570]

I am using this module for conversion of pdf to image. But finding issue, when used s3 storage.

The highlighted line returns blank, which halts successive functionality. Its indirectly using S3fs modules streamwrapper class (Attached), where realpath() returns blank.

Can any one help me here?

Comment	File	Size	Author
#4	pdf_to_imagefield_bug_2638570.patch	3.85 KB	tomhollevoet
	pdf_to_image.png	32.55 KB	nilesh.gaikwad

Comments

Comment #1

21 December 2015 at 07:20

nilesh.gaikwad created an issue. See original summary.

Comment #2

dman commented 21 December 2015 at 22:46

Title:	PDF to image conversion does not work for S3 storage	» PDF to image conversion does not work for remote file wrappers (like S3 storage)
Category:	Bug report	» Feature request

Yeah, that would be a known issue.
Remote filesystems and CDNs etc are not internally supported, as the process that actually runs is a cli (imagemagick) command that operates on locally available files only. The Drupal PHP filesystem wrappers will not work there.

What would probably be needed would be a process that temporarily copies the 'attached' file down to a local folder, runs the process then cleans up. That's quite a lot of extra work, and it's not done yet.
If someone wants to have a go at that or sponsor it, I would be happy to see about reviewing and folding this feature in.

We also have/had a similar challenge over in imagecache_actions where the cli processes need access to a non-local resource. #2325141: Remote File Support for S3 Bucket (allow URL Stream Wrappers to be used)

Comment #3

nilesh.gaikwad commented 22 December 2015 at 05:02

Hi
I tried that getting the file down to local using wget.

But we had one more problem while using load balancer. I have two drupal machines running on load balancer.
While we download, it gets downloaded it gets downloaded on 1/2 machine, and while reading it reads some other machine. So getting Invalid file issue.

Second issue I faced, while coversion if same file is on another Drupal instance, then some images gets generated on different Drupal box, that is sync up issue.

Can any one give me pointers to deal with this issue?

Comment #4

tomhollevoet commented 13 January 2017 at 09:41

Status	File	Size
new	pdf_to_imagefield_bug_2638570.patch	3.85 KB

I fixed this issue.
First i create a temporary file with file_directory_temp() function.
After the creation of the image, i move the file to the new (real) location with file_unmanaged_move().
See patch.