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@flavorjones flavorjones released this 15 May 19:58
· 444 commits to main since this release
v1.15.0
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flavorjones Mike Dalessio
GPG key ID: 6291CAA755BBD80D
Learn about vigilant mode.

1.15.0 / 2023-05-15

Notes

Ability to opt into system malloc and free

Since 2009, Nokogiri has configured libxml2 to use ruby_xmalloc et al for memory management. This has provided benefits for memory management, but comes with a performance penalty.

Users can now opt into using system malloc for libxml2 memory management by setting an environment variable:

# "default" here means "libxml2's default" which is system malloc
NOKOGIRI_LIBXML_MEMORY_MANAGEMENT=default

Benchmarks show that this setting will significantly improve performance, but be aware that the tradeoff may involve poorer memory management including bloated heap sizes and/or OOM conditions.

You can read more about this in the decision record at adr/2023-04-libxml-memory-management.md.

Dependencies

Added

  • Encoding objects may now be passed to serialization methods like #to_xml, #to_html, #serialize, and #write_to to specify the output encoding. Previously only encoding names (strings) were accepted. [#2774, #2798] (Thanks, @ellaklara!)
  • [CRuby] Users may opt into using system malloc for libxml2 memory management. For more detail, see note above or adr/2023-04-libxml-memory-management.md.

Changed

  • [CRuby] Schema.from_document now makes a defensive copy of the document if it has blank text nodes with Ruby objects instantiated for them. This prevents unsafe behavior in libxml2 from causing a segfault. There is a small performance cost, but we think this has the virtue of being "what the user meant" since modifying the original is surprising behavior for most users. Previously this was addressed in v1.10.9 by raising an exception.

Fixed

  • [CRuby] XSLT.transform now makes a defensive copy of the document if it has blank text nodes with Ruby objects instantiated for them and the template uses xsl:strip-spaces. This prevents unsafe behavior in libxslt from causing a segfault. There is a small performance cost, but we think this has the virtue of being "what the user meant" since modifying the original is surprising behavior for most users. Previously this would allow unsafe memory access and potentially segfault. [#2800]

Improved

  • Nokogiri::XML::Node::SaveOptions#inspect now shows the names of the options set in the bitmask, similar to ParseOptions. [#2767]
  • #inspect and pretty-printing are improved for AttributeDecl, ElementContent, ElementDecl, and EntityDecl.
  • [CRuby] The C extension now uses Ruby's TypedData API for managing all the libxml2 structs. Write barriers may improve GC performance in some extreme cases. [#2808] (Thanks, @etiennebarrie and @byroot!)
  • [CRuby] ObjectSpace.memsize_of reports a pretty good guess of memory usage when called on Nokogiri::XML::Document objects. [#2807] (Thanks, @etiennebarrie and @byroot!)
  • [CRuby] Users installing the "ruby" platform gem and compiling libxml2 and libxslt from source will now be using a modern config.guess and config.sub that supports new architectures like loongarch64. [#2831] (Thanks, @zhangwenlong8911!)
  • [CRuby] HTML5 parser:
  • [JRuby] Node#first_element_child now returns nil if there are only non-element children. Previously a null pointer exception was raised. [#2808, #2844]
  • Documentation for Nokogiri::XSLT now has usage examples including custom function handlers.

Deprecated

  • Passing a Nokogiri::XML::Node as the first parameter to CDATA.new is deprecated and will generate a warning. This parameter should be a kind of Nokogiri::XML::Document. This will become an error in a future version of Nokogiri.
  • Passing a Nokogiri::XML::Node as the first parameter to Schema.from_document is deprecated and will generate a warning. This parameter should be a kind of Nokogiri::XML::Document. This will become an error in a future version of Nokogiri.
  • Passing a Nokogiri::XML::Node as the second parameter to Text.new is deprecated and will generate a warning. This parameter should be a kind of Nokogiri::XML::Document. This will become an error in a future version of Nokogiri.
  • [CRuby] Calling a custom XPath function without the nokogiri namespace is deprecated and will generate a warning. Support for non-namespaced functions will be removed in a future version of Nokogiri. (Note that JRuby has never supported non-namespaced custom XPath functions.)

Thank you!

The following people and organizations were kind enough to sponsor @flavorjones or the Nokogiri project during the development of v1.15.0:

We'd also like to thank @github who donate a ton of compute time for our CI pipelines!

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Contributors

flavorjones, github, and 16 other contributors
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