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test_memory_leak.rb
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test_memory_leak.rb
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# frozen_string_literal: true
require "helper"
class TestMemoryLeak < Nokogiri::TestCase
def setup
super
@str = <<~EOF
<!DOCTYPE HTML>
<html>
<body>
<br />
</body>
</html>
EOF
end
#
# this suite is turned off unless the env var NOKOGIRI_GC is non-nil
#
# to run any of these tests, do something like this on the commandline:
#
# $ NOKOGIRI_GC=t ruby -Ilib:test \
# test/test_memory_leak.rb \
# -n /test_leaking_namespace_node_strings/
#
# also see:
#
# https://github.com/sparklemotion/nokogiri/issues/1603
#
# which is an open issue to resurrect these tests and run them as
# part of the CI pipeline.
#
if ENV["NOKOGIRI_GC"] # turning these off by default for now
def test_dont_hurt_em_why
content = File.read("#{File.dirname(__FILE__)}/files/dont_hurt_em_why.xml")
ndoc = Nokogiri::XML(content)
2.times do
ndoc.search("status text").first.inner_text
ndoc.search("user name").first.inner_text
GC.start
end
end
class BadIO
def read(*args)
raise "hell"
end
def write(*args)
raise "chickens"
end
end
def test_for_mem_leak_on_io_callbacks
io = File.open(SNUGGLES_FILE)
Nokogiri::XML.parse(io)
loop do
Nokogiri::XML.parse(BadIO.new) rescue nil # rubocop:disable Style/RescueModifier
doc.write(BadIO.new) rescue nil # rubocop:disable Style/RescueModifier
end
end
def test_for_memory_leak
# we don't use Dike in any tests, but requiring it has side effects
# that can create memory leaks, and that's what we're testing for.
require "rubygems"
require "dike" # do not remove!
count_start = count_object_space_documents
xml_data = <<-EOS
<test>
<items>
<item>abc</item>
<item>1234</item>
<item>Zzz</item>
<items>
</test>
EOS
20.times do
doc = Nokogiri::XML(xml_data)
doc.xpath("//item")
end
2.times { GC.start }
count_end = count_object_space_documents
assert((count_end - count_start) <= 2, "memory leak detected")
rescue LoadError
puts "\ndike is not installed, skipping memory leak test"
end
def test_leak_on_node_replace
loop do
doc = Nokogiri.XML("<root><foo /></root>")
n = Nokogiri::XML::CDATA.new(doc, "bar")
pivot = doc.root.children[0]
pivot.replace(n)
end
end
def test_sax_parser_context
io = StringIO.new(@str)
loop do
Nokogiri::XML::SAX::ParserContext.new(@str)
Nokogiri::XML::SAX::ParserContext.new(io)
io.rewind
Nokogiri::HTML4::SAX::ParserContext.new(@str)
Nokogiri::HTML4::SAX::ParserContext.new(io)
io.rewind
end
end
class JumpingSaxHandler < Nokogiri::XML::SAX::Document
def initialize(jumptag)
@jumptag = jumptag
super()
end
def start_element(name, attrs = [])
throw(@jumptag)
end
end
def test_jumping_sax_handler
doc = JumpingSaxHandler.new(:foo)
loop do
catch(:foo) do
Nokogiri::HTML4::SAX::Parser.new(doc).parse(@str)
end
end
end
def test_in_context_parser_leak
loop do
doc = Nokogiri::XML::Document.new
fragment1 = Nokogiri::XML::DocumentFragment.new(doc, "<foo/>")
node = fragment1.children[0]
node.parse("<bar></bar>")
end
end
def test_in_context_parser_leak_ii
loop { Nokogiri::XML("<a/>").root.parse("<b/>") }
end
def test_leak_on_xpath_string_function
doc = Nokogiri::XML(@str)
loop do
doc.xpath("name(//node())")
end
end
def test_builder_namespace_node_strings_no_prefix
# see https://github.com/sparklemotion/nokogiri/issues/1810 for memory leak report
ns = { "xmlns" => "http://schemas.xmlsoap.org/soap/envelope/" }
20.times do
10_000.times do
Nokogiri::XML::Builder.new do |xml|
xml.send(:Envelope, ns) do
xml.send(:Foobar, ns)
end
end
end
puts MemInfo.rss
end
end
def test_builder_namespace_node_strings_with_prefix
# see https://github.com/sparklemotion/nokogiri/issues/1810 for memory leak report
ns = { "xmlns:foo" => "http://schemas.xmlsoap.org/soap/envelope/" }
20.times do
10_000.times do
Nokogiri::XML::Builder.new do |xml|
xml.send(:Envelope, ns) do
xml.send(:Foobar, ns)
end
end
end
puts MemInfo.rss
end
end
def test_document_remove_namespaces_with_ruby_objects
xml = <<~XML
<root xmlns:a="http://a.flavorjon.es/" xmlns:b="http://b.flavorjon.es/">
<a:foo>hello from a</a:foo>
<b:foo>hello from b</b:foo>
<container xmlns:c="http://c.flavorjon.es/">
<c:foo c:attr='attr-value'>hello from c</c:foo>
</container>
</root>
XML
20.times do
10_000.times do
doc = Nokogiri::XML::Document.parse(xml)
doc.namespaces.each(&:inspect)
doc.remove_namespaces!
end
puts MemInfo.rss
end
end
def test_document_remove_namespaces_without_ruby_objects
xml = <<~XML
<root xmlns:a="http://a.flavorjon.es/" xmlns:b="http://b.flavorjon.es/">
<a:foo>hello from a</a:foo>
<b:foo>hello from b</b:foo>
<container xmlns:c="http://c.flavorjon.es/">
<c:foo c:attr='attr-value'>hello from c</c:foo>
</container>
</root>
XML
20.times do
20_000.times do
doc = Nokogiri::XML::Document.parse(xml)
doc.remove_namespaces!
end
puts MemInfo.rss
end
end
def test_xpath_namespaces
xml = <<~XML
<root xmlns:a="http://a.flavorjon.es/" xmlns:b="http://b.flavorjon.es/">
<a:foo>hello from a</a:foo>
<b:foo>hello from b</b:foo>
<container xmlns:c="http://c.flavorjon.es/">
<c:foo c:attr='attr-value'>hello from c</c:foo>
</container>
</root>
XML
doc = Nokogiri::XML::Document.parse(xml)
ctx = Nokogiri::XML::XPathContext.new(doc)
20.times do
10_000.times do
ctx.evaluate("//namespace::*")
end
puts MemInfo.rss
end
end
def test_leaking_dtd_nodes_after_internal_subset_removal
# see https://github.com/sparklemotion/nokogiri/issues/1784
100_000.times do |i|
doc = Nokogiri::HTML4::Document.new
doc.internal_subset.remove
puts MemInfo.rss if i % 1000 == 0
end
end
describe "#2114 RelaxNG schema parsing has a small memory leak" do
it "no longer leaks" do
prev_rss = MemInfo.rss
100_001.times do |j|
Nokogiri::XML::RelaxNG.from_document(Nokogiri::XML::Document.parse(File.read(ADDRESS_SCHEMA_FILE)))
next unless j % 10_000 == 0
curr_rss = MemInfo.rss
diff_rss = curr_rss - prev_rss
printf("\n(iter %d) %d", j, curr_rss)
printf(" (%s%d)", diff_rss >= 0 ? "+" : "-", diff_rss) if j > 0
prev_rss = curr_rss
end
puts
end
end
end # if NOKOGIRI_GC
def test_object_space_memsize_of
require "objspace"
skip("memsize_of not defined") unless ObjectSpace.respond_to?(:memsize_of)
base_size = ObjectSpace.memsize_of(Nokogiri::XML(<<~XML))
<root>
<child>asdf</child>
</root>
XML
more_children_size = ObjectSpace.memsize_of(Nokogiri::XML(<<~XML))
<root>
<child>asdf</child>
<child>asdf</child>
<child>asdf</child>
</root>
XML
assert(more_children_size > base_size, "adding children should increase memsize")
attributes_size = ObjectSpace.memsize_of(Nokogiri::XML(<<~XML))
<root>
<child a="b" c="d">asdf</child>
</root>
XML
assert(attributes_size > base_size, "adding attributes should increase memsize")
string_size = ObjectSpace.memsize_of(Nokogiri::XML(<<~XML))
<root>
<child>asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf</child>
</root>
XML
assert(string_size > base_size, "longer strings should increase memsize")
bigger_name_size = ObjectSpace.memsize_of(Nokogiri::XML(<<~XML))
<root>
<superduperamazingchild>asdf</superduperamazingchild>
</root>
XML
assert(bigger_name_size > base_size, "longer tags should increase memsize")
end
module MemInfo
# from https://stackoverflow.com/questions/7220896/get-current-ruby-process-memory-usage
# this is only going to work on linux
PAGE_SIZE = begin
%x(getconf PAGESIZE).chomp.to_i
rescue
4096
end
STATM_PATH = "/proc/#{Process.pid}/statm"
STATM_FOUND = File.exist?(STATM_PATH)
def self.rss
if STATM_FOUND
return (File.read(STATM_PATH).split(" ")[1].to_i * PAGE_SIZE) / 1024
end
0
end
end
private
def count_object_space_documents
count = 0
ObjectSpace.each_object { |j| count += 1 if j.is_a?(Nokogiri::XML::Document) }
count
end
end