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# Adapted from ruby's test/lib/leakchecker.rb.
# Ruby's 2-clause BSDL follows.
# Copyright (C) 1993-2013 Yukihiro Matsumoto. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
class LeakError < StandardError
end
class LeakChecker
attr_reader :leaks
def initialize
@fd_info = find_fds
@tempfile_info = find_tempfiles
@thread_info = find_threads
@env_info = find_env
@argv_info = find_argv
@encoding_info = find_encodings
end
def check(state)
@state = state
@leaks = []
check_fd_leak
check_tempfile_leak
check_thread_leak
check_process_leak
check_env
check_argv
check_encodings
GC.start if !@leaks.empty?
@leaks.empty?
end
private
def find_fds
fd_dir = "/proc/self/fd"
if File.directory?(fd_dir)
fds = Dir.open(fd_dir) {|d|
a = d.grep(/\A\d+\z/, &:to_i)
if d.respond_to? :fileno
a -= [d.fileno]
end
a
}
fds.sort
else
[]
end
end
def check_fd_leak
live1 = @fd_info
if IO.respond_to?(:console) and (m = IO.method(:console)).arity.nonzero?
m[:close]
end
live2 = find_fds
fd_closed = live1 - live2
if !fd_closed.empty?
fd_closed.each {|fd|
leak "Closed file descriptor: #{fd}"
}
end
fd_leaked = live2 - live1
if !fd_leaked.empty?
h = {}
ObjectSpace.each_object(IO) {|io|
inspect = io.inspect
begin
autoclose = io.autoclose?
fd = io.fileno
rescue IOError # closed IO object
next
end
(h[fd] ||= []) << [io, autoclose, inspect]
}
fd_leaked.each {|fd|
str = ''
if h[fd]
str << ' :'
h[fd].map {|io, autoclose, inspect|
s = ' ' + inspect
s << "(not-autoclose)" if !autoclose
s
}.sort.each {|s|
str << s
}
end
leak "Leaked file descriptor: #{fd}#{str}"
}
#system("lsof -p #$$") if !fd_leaked.empty?
h.each {|fd, list|
next if list.length <= 1
if 1 < list.count {|io, autoclose, inspect| autoclose }
str = list.map {|io, autoclose, inspect| " #{inspect}" + (autoclose ? "(autoclose)" : "") }.sort.join
leak "Multiple autoclose IO object for a file descriptor:#{str}"
end
}
end
@fd_info = live2
end
def extend_tempfile_counter
return if defined? LeakChecker::TempfileCounter
m = Module.new {
@count = 0
class << self
attr_accessor :count
end
def new(data)
LeakChecker::TempfileCounter.count += 1
super(data)
end
}
LeakChecker.const_set(:TempfileCounter, m)
class << Tempfile::Remover
prepend LeakChecker::TempfileCounter
end
end
def find_tempfiles(prev_count=-1)
return [prev_count, []] unless defined? Tempfile
extend_tempfile_counter
count = TempfileCounter.count
if prev_count == count
[prev_count, []]
else
tempfiles = ObjectSpace.each_object(Tempfile).find_all {|t| t.path }
[count, tempfiles]
end
end
def check_tempfile_leak
return false unless defined? Tempfile
count1, initial_tempfiles = @tempfile_info
count2, current_tempfiles = find_tempfiles(count1)
tempfiles_leaked = current_tempfiles - initial_tempfiles
if !tempfiles_leaked.empty?
list = tempfiles_leaked.map {|t| t.inspect }.sort
list.each {|str|
leak "Leaked tempfile: #{str}"
}
tempfiles_leaked.each {|t| t.close! }
end
@tempfile_info = [count2, initial_tempfiles]
end
def find_threads
Thread.list.find_all {|t|
t != Thread.current && t.alive?
}
end
def check_thread_leak
live1 = @thread_info
live2 = find_threads
thread_finished = live1 - live2
if !thread_finished.empty?
list = thread_finished.map {|t| t.inspect }.sort
list.each {|str|
leak "Finished thread: #{str}"
}
end
thread_leaked = live2 - live1
if !thread_leaked.empty?
list = thread_leaked.map {|t| t.inspect }.sort
list.each {|str|
leak "Leaked thread: #{str}"
}
end
@thread_info = live2
end
def check_process_leak
subprocesses_leaked = Process.waitall
subprocesses_leaked.each { |pid, status|
leak "Leaked subprocess: #{pid}: #{status}"
}
end
def find_env
ENV.to_h
end
def check_env
old_env = @env_info
new_env = find_env
return if old_env == new_env
(old_env.keys | new_env.keys).sort.each {|k|
if old_env.has_key?(k)
if new_env.has_key?(k)
if old_env[k] != new_env[k]
leak "Environment variable changed : #{k.inspect} changed : #{old_env[k].inspect} -> #{new_env[k].inspect}"
end
else
leak "Environment variable changed: #{k.inspect} deleted"
end
else
if new_env.has_key?(k)
leak "Environment variable changed: #{k.inspect} added"
else
flunk "unreachable"
end
end
}
@env_info = new_env
end
def find_argv
ARGV.map { |e| e.dup }
end
def check_argv
old_argv = @argv_info
new_argv = find_argv
if new_argv != old_argv
leak "ARGV changed: #{old_argv.inspect} to #{new_argv.inspect}"
@argv_info = new_argv
end
end
def find_encodings
[Encoding.default_internal, Encoding.default_external]
end
def check_encodings
old_internal, old_external = @encoding_info
new_internal, new_external = find_encodings
if new_internal != old_internal
leak "Encoding.default_internal changed: #{old_internal.inspect} to #{new_internal.inspect}"
end
if new_external != old_external
leak "Encoding.default_external changed: #{old_external.inspect} to #{new_external.inspect}"
end
@encoding_info = [new_internal, new_external]
end
def leak(message)
if @leaks.empty?
$stderr.puts "\n"
$stderr.puts @state.description
end
@leaks << message
$stderr.puts message
end
end
class LeakCheckerAction
def register
MSpec.register :start, self
MSpec.register :after, self
end
def start
@checker = LeakChecker.new
end
def after(state)
unless @checker.check(state)
leak_messages = @checker.leaks
location = state.description
if state.example
location = "#{location}\n#{state.example.source_location.join(':')}"
end
MSpec.protect(location) do
raise LeakError, leak_messages.join("\n")
end
end
end
end
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