[question] How to use True Streaming in PHP?

[andrefelipe]

Hello @jcupitt hope to find you well.

Could you please guide me how to use True Streaming in PHP?

I read the release notes, but could not figure how to do in PHP, tried looking in the source code but did not go to far.

My use case is a thumbnailing service on S3, source and target images stay on S3.

I already have it working, but do the old way:

• first I get the S3 object with AWS SDK PHP
• then use newFromBuffer
• then do the operations with thumbnail_image
• then $image->writeToFile (I am storing on disk for now, but the goal is to store on S3)

Could you please share some insights?

Have a good day.

[jcupitt]

Hello, the new streaming stuff hasn’t been added to the PHP binding yet. It’s not hard, just that no ones got around to it. PRs very welcome, of course.

[andrefelipe]

Thanks, I understand!

[jcupitt]

Let's reopen as a reminder to fix this.

[mnavarrocarter]

I'm willing to help on this as I really need this feature, but I have zero idea where to start.

[jcupitt]

Hello, you need to add the relevant chunks of the libvips API to php-vips-ext, then expose that in a nice way in php-vips.

The ruby version should give a hint as to the libvips API you need to support and the sort of API you could expose in php-vips, though of course you'd need to implement in C and php:

https://github.com/libvips/ruby-vips/blob/master/lib/vips/source.rb
https://github.com/libvips/ruby-vips/blob/master/lib/vips/target.rb
https://github.com/libvips/ruby-vips/blob/master/lib/vips/image.rb#L425

An alternative would be to get rid of php-vips-ext and redo everything in php-ffi, which might now have enough features to support php-vips.

https://www.php.net/manual/en/book.ffi.php

I think it used to be missing some stuff, I forget exactly what. Getting rid of php-vips-ext would make php-vips much simpler to install and maintain, so there would be other benefits.

[mnavarrocarter]

I might give it a go to using FFI.

I understand that I need to map the C headers to functions to do that, and provide the path to the library for my architecture right? Sorry, but my experience in FFI is very limited.

[jcupitt]

That's right. You can use the ruby one as a guide, or there's python too:

https://github.com/libvips/pyvips

They both use ffi to wrap libvips.

There are some general notes in the "binding" chapter of the docs:

https://libvips.github.io/libvips/API/current/binding.md.html

[mnavarrocarter]

Thank you for all the useful links. Before I send a PR, I would like to play with it and see if I can do it well. I'll create a repo for trying to implement a small subset of the api. Would you be willing to review it and give me some feedback?

[jcupitt]

Of course, I'd be delighted.

[mnavarrocarter]

I'm just leaving this here for myself. It has some info I would like to come back to.

libvips/libvips#1885