PHP extensions

[thekid]

Currently, we compile with the following extensions enabled:

• Core
• bcmath
• ctype
• date
• fileinfo
• filter
• hash
• iconv
• json
• openssl
• pcre
• Phar
• posix
• Reflection
• session
• SPL
• standard
• tokenizer

Looking at https://bref.sh/docs/environment/php.html#extensions-installed-and-enabled and from scanning through use cases, the following could be interesting:

• gd, exif - image processing
• mbstring - prerequisite for exif anyways
• sodium - for crypto
• zlib - if we want to create ZIP files, HTTP compression - see https://github.com/xp-forge/lambda/issues/8#issuecomment-1184378957
• sqlite3 - for temporary data storage
• libxml, dom, xml, xmlreader, xmlwriter - for processing XML and HTML - see #11

The following extensions don't seem to make sense for an AWS lambda enviromment:

• pcntl - for parallelization, you would most probably just invoke other lambdas and/or use a message queue
• readline - this is for humans sitting in front of a terminal, not for the serverside
• curl, ftp, mysqli / mysqlnd - the XP Framework has it's own protocol implementations
• sockets - the standard socket library works just as well for (most - or almost all?) cases
• opcache - we leave our code running after compiling once, caching doesn't improve this any more
• SimpleXML - covered by XP Framework's XML APIs - used by AWS SDK, see https://github.com/xp-forge/lambda/issues/8#issuecomment-966497081

[thekid]

However, all these increase the PHP binary size, it might be valuable looking into providing these as extra layers like Bref does, but instead of hosting them somewhere, providing a xp lambda layer command to create them from scratch

[thekid]

libxml, dom, xml, xmlreader, xmlwriter - for processing XML and HTML

See #11

[thekid]

mbstring - prerequisite for exif anyways

See #12

[thekid]

https://packagist.org/packages/aws/aws-sdk-php and https://packagist.org/packages/async-aws/core require SimpleXML

[thekid]

https://packagist.org/packages/aws/aws-sdk-php and https://packagist.org/packages/async-aws/core require SimpleXML

Rolled out in https://github.com/xp-forge/lambda/releases/tag/v3.1.0

[thekid]

ZLib could be implemented via https://gist.github.com/chobie/6659137 as a fallback:

"You can use my implementation freely even for commercial purpose ..."

[thekid]

ZLib could be implemented

...but on the other hand, simply adding the --with-zlib configure option doesn't yield a big difference!

Before:

[+] Creating runtime-8.0.21.zip
 => create --name 62d00678ec295 lambda-xp-runtime:8.0.21
aeb956bff0da38d5254234ca63e3594a5f6f9dff9ed485353cd08557194d4fef
 => cp 62d00678ec295:/opt/php/runtime.zip runtime-8.0.21.zip
 => rm -f 62d00678ec295
aeb956bff0da38d5254234ca63e3594a5f6f9dff9ed485353cd08557194d4fef

Wrote 2,530,040 bytes

After:

[+] Creating runtime-8.0.21.zip
 => create --name 62d008947c97a lambda-xp-runtime:8.0.21
bd517bac950db0f3542c93ba2ef63faeeb991b5873b5b083b3c8282ebb5094d8
 => cp 62d008947c97a:/opt/php/runtime.zip runtime-8.0.21.zip
 => rm -f 62d008947c97a
bd517bac950db0f3542c93ba2ef63faeeb991b5873b5b083b3c8282ebb5094d8

Wrote 2,542,744 bytes

(~12 Kilobytes)

[thekid]

zlib - if we want to create ZIP files, HTTP compression

Rolled out in https://github.com/xp-forge/lambda/releases/tag/v4.1.0

[thekid]

The configure line used is:

./configure \
  --prefix=/opt/php/ \
  --without-sqlite3 \
  --with-zlib \
  --with-openssl \
  --enable-bcmath \
  --disable-pdo