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class LeakChecker
def initialize
@fd_info = find_fds
@tempfile_info = find_tempfiles
@thread_info = find_threads
@env_info = find_env
end
def check(test_name)
leaks = [
check_fd_leak(test_name),
check_thread_leak(test_name),
check_tempfile_leak(test_name),
check_env(test_name)
]
GC.start if leaks.any?
end
def find_fds
if IO.respond_to?(:console) and (m = IO.method(:console)).arity.nonzero?
m[:close]
end
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(test_name)
leaked = false
live1 = @fd_info
live2 = find_fds
fd_closed = live1 - live2
if !fd_closed.empty?
fd_closed.each {|fd|
puts "Closed file descriptor: #{test_name}: #{fd}"
}
end
fd_leaked = live2 - live1
if !fd_leaked.empty?
leaked = true
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
puts "Leaked file descriptor: #{test_name}: #{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
puts "Multiple autoclose IO object for a file descriptor:#{str}"
end
}
end
@fd_info = live2
return leaked
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(test_name)
return false unless defined? Tempfile
count1, initial_tempfiles = @tempfile_info
count2, current_tempfiles = find_tempfiles(count1)
leaked = false
tempfiles_leaked = current_tempfiles - initial_tempfiles
if !tempfiles_leaked.empty?
leaked = true
list = tempfiles_leaked.map {|t| t.inspect }.sort
list.each {|str|
puts "Leaked tempfile: #{test_name}: #{str}"
}
tempfiles_leaked.each {|t| t.close! }
end
@tempfile_info = [count2, initial_tempfiles]
return leaked
end
def find_threads
Thread.list.find_all {|t|
t != Thread.current && /\AWEBrick::/ !~ t.class.name && t.alive?
}
end
def check_thread_leak(test_name)
live1 = @thread_info
live2 = find_threads
thread_finished = live1 - live2
leaked = false
if !thread_finished.empty?
list = thread_finished.map {|t| t.inspect }.sort
list.each {|str|
puts "Finished thread: #{test_name}: #{str}"
}
end
thread_leaked = live2 - live1
if !thread_leaked.empty?
leaked = true
list = thread_leaked.map {|t| t.inspect }.sort
list.each {|str|
puts "Leaked thread: #{test_name}: #{str}"
}
end
@thread_info = live2
return leaked
end
def find_env
ENV.to_h
end
def check_env(test_name)
old_env = @env_info
new_env = ENV.to_h
return false 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]
puts "Environment variable changed: #{test_name} : #{k.inspect} changed : #{old_env[k].inspect} -> #{new_env[k].inspect}"
end
else
puts "Environment variable changed: #{test_name} : #{k.inspect} deleted"
end
else
if new_env.has_key?(k)
puts "Environment variable changed: #{test_name} : #{k.inspect} added"
else
flunk "unreachable"
end
end
}
@env_info = new_env
return true
end
def puts(*a)
MiniTest::Unit.output.puts(*a)
end
end
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