Class: Arachni::Support::Profiler

Inherits:
Object
  • Object
show all
Defined in:
lib/arachni/support/profiler.rb

Overview

Author:

  • Tasos “Zapotek” Laskos <tasos.laskos@arachni-scanner.com>

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.write_samples_to_disk(file, options = {}) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 20

def self.write_samples_to_disk( file, options = {} )
    profiler = Support::Profiler.new
    profiler.trace_allocations

    Thread.new do
        begin
            loop do
                profiler.write_object_space( file, options )
                sleep options[:interval] || 1
            end
        rescue => e
            ap e
            ap e.backtrace
        end
    end
end

Instance Method Details

#count_objects(klass) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 212

def count_objects( klass )
    ObjectSpace.each_object( klass ){}
end

#find_dependencies(_object_id, _mapped = {}) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 58

def find_dependencies( _object_id, _mapped = {} )
    mapped = _mapped
    points_to_object = find_references( Mass[_object_id] )
    ids = points_to_object.keys.map { |x| /\#(\d*)/.match(x).captures.first.to_i }
    mapped[_object_id] = points_to_object#ids

    unmapped = ids - mapped.keys
    unmapped.each do |x|
        new_deps = find_dependencies( x, mapped )
        mapped.merge( new_deps )
    end
    mapped
end

#find_references(o) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 54

def find_references( o )
    Mass.references( o )
end

#object_space(options = {}) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 82

def object_space( options = {} )
    klass      = options[:class]
    namespaces = options[:namespaces] || [
        Arachni,
        Ethon,
        Typhoeus,
        Watir,
        Selenium,
        Addressable,
        Nokogiri,
        String,
        Hash,
        Array,
        Set,
        Thread
    ]

    namespaces = Set.new( namespaces )

    max_entries = options[:max_entries] || 50

    object_space    = {}
    @object_space ||= {}

    ObjectSpace.each_object do |o|
        next if o.class != klass && !object_within_namespace?( o, namespaces )

        # if o.class == Page
        #     # print_object_allocations( o )
        #
        #     # ap ObjectSpace.allocation_class_path( o ).to_s
        #     # ap "#{ObjectSpace.allocation_sourcefile( o )}:#{ObjectSpace.allocation_sourceline( o )}"
        #     ap find_references( o )
        # end

        # if o.class == String && o.size > 1_000_000
        #     print_object_allocations( o )
        #     # print_references( o )
        #     # print_dependencies( o )
        #
        #     Process.kill 'KILL', Process.pid
        # end

        # if o.class == Thread
        #     print_object_allocations( o )
        #     # print_references( o )
        #     # print_dependencies( o )
        #
        #     # Process.kill 'KILL', Process.pid
        # end

        object_space[o.class] ||= {
            memsize: 0,
            count:   0
        }

        if o.class == String
            object_space[o.class][:memsize] += o.bytesize
        else
            object_space[o.class][:memsize] += ObjectSpace.memsize_of(o)
        end

        object_space[o.class][:count] += 1
    end

    ap '-' * 120

    object_space['All'] = {
        memsize: ObjectSpace.memsize_of_all,
        count:   ObjectSpace.count_objects_size[:TOTAL]
    }

    object_space = Hash[object_space.sort_by { |_, v| v[:count] }.reverse[0..max_entries]]

    with_deltas = {}
    object_space.each do |k, v|
        @object_space[k] ||= {
            memsize: 0,
            count:   0
        }

        if v[:count].is_a? Numeric
            with_deltas[k] = "#{v[:count]} (#{v[:count] - @object_space[k][:count]})"
            with_deltas[k] << " -- #{Utilities.bytes_to_megabytes v[:memsize]}"
            with_deltas[k] << " (#{Utilities.bytes_to_megabytes v[:memsize] - @object_space[k][:memsize]})"
        else
            with_deltas[k] = "#{v[:count]} -- #{Utilities.bytes_to_megabytes v[:memsize]}"
        end
    end

    @object_space = object_space.dup
    with_deltas

rescue => e
    ap e
    ap e.backtrace
    {}
end

#print_dependencies(o) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 72

def print_dependencies( o )
    ap 'Dependencies'
    ap find_dependencies( o.object_id )
end

#print_object_allocations(o) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 42

def print_object_allocations( o )
    ap 'Reachable:   ' + ObjectSpace.reachable_objects_from(o).to_s  #=> [referenced, objects, ...]
    ap 'Object ID:   ' + o.object_id.to_s
    ap 'Source file: ' + ObjectSpace.allocation_sourcefile(o).to_s
    ap 'Source line: ' + ObjectSpace.allocation_sourceline(o).to_s
    ap 'Generation:  ' + ObjectSpace.allocation_generation(o).to_s
    ap 'Class path:  ' + ObjectSpace.allocation_class_path(o).to_s
    ap 'Method:      ' + ObjectSpace.allocation_method_id(o).to_s
    ap 'Memsize:     ' + ObjectSpace.memsize_of(o).to_s
    ap '-' * 200
end

#print_object_space(options = {}) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 208

def print_object_space( options = {} )
    ap object_space( options )
end

#print_references(o) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 77

def print_references( o )
    ap 'References'
    ap find_references( o )
end

#resource_consumption ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 216

def resource_consumption
    procinfo = ::Sys::ProcTable.ps( Process.pid )
    {
        cpu_utilization:    procinfo[:pctcpu],
        memory_utilization: procinfo[:pctmem],
        memory_usage:       rss_to_mb( procinfo[:rss] )
    }
end

#rss_to_mb(rss) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 225

def rss_to_mb( rss )
    rss * 4096.0 / 1024.0 / 1024.0
end

#trace_allocations ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 37

def trace_allocations
    require 'objspace'
    ObjectSpace.trace_object_allocations_start
end

#write_object_space(file, options = {}) ⇒ Object 



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# File 'lib/arachni/support/profiler.rb', line 181

def write_object_space( file, options = {} )
    consumption = resource_consumption

    mem = consumption[:memory_usage].round(3)

    delta_mem = 0
    if @consumption
        delta_mem = (mem - @consumption[:memory_usage]).round(3)
    end

    str = "RAM: #{mem}MB (#{delta_mem}MB)"
    str << " (#{consumption[:memory_utilization]}%)"
    str << " - CPU: #{consumption[:cpu_utilization]}%\n\n"

    @consumption = consumption

    os      = object_space( options )
    maxsize = os.keys.map(&:to_s).map(&:size).sort.reverse.first

    os.each do |klass, info|
        offset = maxsize - klass.to_s.size
        str << "#{klass}: #{' ' * offset}#{info}\n"
    end

    IO.write( file, str )
end