RubyConf Brazil 2015: Deep Diving: How to Explore a New Code Base

As a developer, diving in a new code base is not uncommon: you've just been hired, you change of project, you want to help an open source project, the open source library your project depends on is buggy, etc. It's like entering in a underwater cave, you don't know the treasures or the monsters you'll find there, neither if the path is treacherous or if it's a true labyrinth where you'll get lost. You can prepare yourself, you can plan your visit, you can equip yourself, you can survive and find the gem you're looking for...

The gem trace_calls https://github.com/toch/trace_calls
The original snippet of code using TracePoint API https://gist.github.com/toch/82fd93ca449500d21f00

Transcript

1. Deep Diving:
   How to Explore a
   New Codebase
   Andy Spearing © 2009
   

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2. _toch
   toch
   Hi, I'm
   Christophe
   

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3. @matylda © 2011
   Intro
   

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4. @matylda © 2011
   The most
   common
   task
   

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5. continuous typing
   

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6. View Slide

7. but
   continuous reading
   Jono Witts © 2008
   

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8. Each written line
   is read
   at least 1 time
   Gavin St. Ours © 20013
   

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9. ● 300 dev days
   ● 14633 LOC
   ● 634595 Changed lines
   ● → 634595 / 14633 ~ 43 changed LOC / LOC
   

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10. For 1 final line,
    I read at least
    43 lines.
    

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12. How to
    Dive
    into a project
    Stuart Hamilton © 2008
    

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13. DO NOT
    Wander
    without a plan
    Felix Esteban © 2004
    

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14. Journey
    Needs
    Plan
    Peter Southwood © 20011
    

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15. Plan
    1. Goal
    2. Map
    3. Equipment & Dive
    4. Next?
    Peter Southwood © 20011
    

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16. 1.
    Goal
    Peter Southwood © 20011
    

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17. ➔ fix a bug
    ➔ implement a feature
    ➔ write some doc
    ➔ style the code
    ➔ refactor a small piece of code
    ➔ simply use it
    

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19. http_proxy=http://127.0.0.1 \
    ruby -e "
    require 'open-uri'
    open(
    'http://google.com',
    proxy: nil
    )
    "
    

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20. ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:878:in `initialize': Connection
    refused - connect(2) (Errno::ECONNREFUSED)
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:878:in `open'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:878:in `block in connect'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/timeout.rb:52:in `timeout'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:877:in `connect'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:862:in `do_start'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:851:in `start'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:313:in `open_http'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:708:in `buffer_open'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:210:in `block in open_loo
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:208:in `catch'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:208:in `open_loop'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:149:in `open_uri'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:688:in `open'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:34:in `open'
    from -e:1:in `'
    

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21. 2.
    Map
    Peter Southwood © 20011
    

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22. Find the Map
    ➔ Repository URI
    ➔ Project URI
    ➔ Intro Doc: README
    

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23. Find the Map
    ● https://github.com/ruby/ruby
    ● https://bugs.ruby-lang.org/
    ● https://github.com/ruby/ruby/blob/trunk/
    README.md
    

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24. Find the Legend
    

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25. a
    Legend
    

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26. Find the Legend
    ➔ CONTRIBUTING Guideline
    

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27. Find the Legend
    ➔ CONTRIBUTING Guideline
    https://github.com/ruby/ruby/blob/trunk/
    CONTRIBUTING.md
    

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28. Find the Legend
    ➔ CONTRIBUTING Guideline
    https://github.com/ruby/ruby/blob/trunk/
    CONTRIBUTING.md
    

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29. Find the Legend
    ➔ CONTRIBUTING Guideline
    ➔ Directory Structure
    

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30. Find the Legend
    ➔ CONTRIBUTING Guideline
    ➔ Directory Structure
    

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31. Find the Legend
    ➔ CONTRIBUTING Guideline
    ➔ Directory Structure
    ➔ Talk to other contributors, maintainers
    

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32. Find the Legend
    ➔ CONTRIBUTING Guideline
    ➔ Directory Structure
    ➔ Talk to other contributors, maintainers
    ➔ Participate to the dev meeting
    

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33. If blocked?
    ➔ ASK!
    

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34. Boris Dimitrov © 20009
    3.
    Equipment
    & Dive
    

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35. Get a Toolbelt
    ➔ Pick an Editor
    

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36. xkcd
    

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37. Get a Toolbelt
    ➔ Pick an Editor
    ➔ Bundle
    

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38. $ cd GitLab
    $ bundle viz
    

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39. $ cd GitLab
    $ bundle viz
    

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40. $ cd GitLab
    $ bundle viz
    

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41. Get a Toolbelt
    ➔ Pick an Editor
    ➔ Bundle
    ➔ Run Tests
    

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42. Get a Toolbelt
    ➔ Pick an Editor
    ➔ Bundle
    ➔ Run Tests
    ➔ Others
    

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43. Get a Toolbelt
    ➔ ST3
    ➔ Apply a Patch & Use it
    ➔ MRI WIKI DeveloperHowto
    ➔ Sign up to Ruby Redmine
    

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44. Use your Toolbelt
    ➔ Run the App & Use it
    

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45. http_proxy=http://127.0.0.1 \
    ruby -e "
    require 'open-uri'
    open(
    'http://google.com',
    proxy: nil
    )
    "
    

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46. Use your Toolbelt
    ➔ Run the App & Use it
    ➔ Read the Code
    

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47. $ wc -l *.rb
    1001 common.rb
    257 ftp.rb
    1676 generic.rb
    106 http.rb
    22 https.rb
    260 ldap.rb
    20 ldaps.rb
    280 mailto.rb
    3622 total
    open-uri
    

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48. ➔ Find proxy management
    ➔ Understand how open_http works
    ➔ Spot the bug
    URI
    

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49. ➔ Trace the Calls
    Dive into URI
    

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50. ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:878:in `initialize': Connection
    refused - connect(2) (Errno::ECONNREFUSED)
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:878:in `open'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:878:in `block in connect'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/timeout.rb:52:in `timeout'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:877:in `connect'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:862:in `do_start'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/net/http.rb:851:in `start'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:313:in `open_http'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:708:in `buffer_open'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:210:in `block in open_loo
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:208:in `catch'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:208:in `open_loop'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:149:in `open_uri'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:688:in `open'
    from ~/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/open-uri.rb:34:in `open'
    from -e:1:in `'
    

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51. def get_call_graph_on
    scope = {}
    trace = TracePoint.new(:call, :line) do |tp|
    case tp.event
    when :call then puts "#{tp.path}:#{tp.lineno} #{tp.defined_class}::#{tp.method_id} called from " \
    "#{scope[:path]}:#{scope[:lineno]} #{scope[:class]}::#{scope[:method_id]}"
    when :line then scope = {
    event: :line,
    lineno: tp.lineno,
    path: tp.path,
    class: tp.defined_class,
    method_id: tp.method_id
    }
    end
    end
    trace.enable
    yield
    trace.disable
    end
    

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52. scope = {}
    trace = TracePoint.new(:call, :line) do |tp|
    case tp.event
    # ...
    end
    end
    

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53. trace = TracePoint.new(:call, :line) do |tp|
    case tp.event
    when :call then puts
    "#{tp.path}:#{tp.lineno} ..." \
    "#{scope[:path]}:#{scope[:lineno]} ..."
    # ...
    end
    end
    

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54. # ...
    when :line then scope = {
    event: :line,
    lineno: tp.lineno,
    path: tp.path,
    class: tp.defined_class,
    method_id: tp.method_id
    }
    

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55. trace.enable
    yield
    trace.disable
    

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56. require 'open-uri'
    get_call_graph_on do
    open(
    'http://google.com',
    proxy: nil
    )
    end
    

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57. View Slide

58. require 'open-uri'
    require 'trace_calls'
    TraceCalls::on do
    open('http://google.com', proxy: nil)
    end
    puts TraceCalls::root
    

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59. +-Kernel::open
    +-#::parse called from Kernel::open at 33
    | \-URI::Parser::parse called from #::parse at 747
    | | +-URI::Parser::split called from URI::Parser::parse at 211
    | | +-#::scheme_list called from URI::Parser::parse at 213
    | | +-#::scheme_list called from URI::Parser::parse at 214
    | | \-URI::HTTP::initialize called from URI::Parser::parse at 660
    | | | \-URI::Generic::initialize called from URI::HTTP::initialize at 84
    | | | | +-URI::Generic::set_scheme called from URI::Generic::initialize at 203
    | | | | +-URI::Generic::set_userinfo called from URI::Generic::initialize at 204
    | | | | | \-URI::Generic::split_userinfo called from URI::Generic::set_userinfo at 525
    | | | | +-URI::Generic::set_host called from URI::Generic::initialize at 205
    | | | | +-URI::Generic::set_port called from URI::Generic::initialize at 206
    | | | | +-URI::Generic::set_path called from URI::Generic::initialize at 207
    | | | | +-URI::Generic::set_query called from URI::Generic::initialize at 208
    | | | | +-URI::Generic::set_opaque called from URI::Generic::initialize at 209
    | | | | +-URI::Generic::set_registry called from URI::Generic::initialize at 210
    | | | | +-URI::Generic::set_fragment called from URI::Generic::initialize at 211
    | | | | +-URI::Generic::default_port called from URI::Generic::initialize at 220
    | | | | | \-#::default_port called from URI::Generic::default_port at
    | | | | +-URI::Generic::default_port called from URI::Generic::initialize at 220
    | | | | | \-#::default_port called from URI::Generic::default_port at
    | | | | \-URI::Generic::set_port called from URI::Generic::initialize at 30
    

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60. +-Kernel::open
    +-#::parse called from Kernel::open at 33
    | \-URI::Parser::parse called from #::parse at 747
    | | +-URI::Parser::split called from URI::Parser::parse at 211
    | | +-#::scheme_list called from URI::Parser::parse at 213
    | | +-#::scheme_list called from URI::Parser::parse at 214
    | | \-URI::HTTP::initialize called from URI::Parser::parse at 660
    | | | \-URI::Generic::initialize called from URI::HTTP::initialize at 84
    | | | | +-URI::Generic::set_scheme called from URI::Generic::initialize at 203
    | | | | +-URI::Generic::set_userinfo called from URI::Generic::initialize at 204
    | | | | | \-URI::Generic::split_userinfo called from URI::Generic::set_userinfo at 525
    | | | | +-URI::Generic::set_host called from URI::Generic::initialize at 205
    | | | | +-URI::Generic::set_port called from URI::Generic::initialize at 206
    | | | | +-URI::Generic::set_path called from URI::Generic::initialize at 207
    | | | | +-URI::Generic::set_query called from URI::Generic::initialize at 208
    | | | | +-URI::Generic::set_opaque called from URI::Generic::initialize at 209
    | | | | +-URI::Generic::set_registry called from URI::Generic::initialize at 210
    | | | | +-URI::Generic::set_fragment called from URI::Generic::initialize at 211
    | | | | +-URI::Generic::default_port called from URI::Generic::initialize at 220
    | | | | | \-#::default_port called from URI::Generic::default_port at
    | | | | +-URI::Generic::default_port called from URI::Generic::initialize at 220
    | | | | | \-#::default_port called from URI::Generic::default_port at
    | | | | \-URI::Generic::set_port called from URI::Generic::initialize at 30
    

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61. +-Kernel::open
    +-#::parse called from Kernel::open at 33
    | \-URI::Parser::parse called from #::parse at 747
    | | +-URI::Parser::split called from URI::Parser::parse at 211
    | | +-#::scheme_list called from URI::Parser::parse at 213
    | | +-#::scheme_list called from URI::Parser::parse at 214
    | | \-URI::HTTP::initialize called from URI::Parser::parse at 660
    | | | \-URI::Generic::initialize called from URI::HTTP::initialize at 84
    | | | | +-URI::Generic::set_scheme called from URI::Generic::initialize at 203
    | | | | +-URI::Generic::set_userinfo called from URI::Generic::initialize at 204
    | | | | | \-URI::Generic::split_userinfo called from URI::Generic::set_userinfo at 525
    | | | | +-URI::Generic::set_host called from URI::Generic::initialize at 205
    | | | | +-URI::Generic::set_port called from URI::Generic::initialize at 206
    | | | | +-URI::Generic::set_path called from URI::Generic::initialize at 207
    | | | | +-URI::Generic::set_query called from URI::Generic::initialize at 208
    | | | | +-URI::Generic::set_opaque called from URI::Generic::initialize at 209
    | | | | +-URI::Generic::set_registry called from URI::Generic::initialize at 210
    | | | | +-URI::Generic::set_fragment called from URI::Generic::initialize at 211
    | | | | +-URI::Generic::default_port called from URI::Generic::initialize at 220
    | | | | | \-#::default_port called from URI::Generic::default_port at
    | | | | +-URI::Generic::default_port called from URI::Generic::initialize at 220
    | | | | | \-#::default_port called from URI::Generic::default_port at
    | | | | \-URI::Generic::set_port called from URI::Generic::initialize at 30
    

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62. \-OpenURI::OpenRead::open called from Kernel::open at 34
    | \-#::open_uri called from OpenURI::OpenRead::open at 688
    | | +-#::scan_open_optional_arguments called from #::open_ur
    | | +-#::check_options called from #::open_uri at 136
    | | \-#::open_loop called from #::open_uri at 149
    | | | +-OpenURI::Buffer::initialize called from #::open_loop at 209
    | | | +-URI::HTTP::buffer_open called from #::open_loop at 195
    | | | | \-#::open_http called from URI::HTTP::buffer_open at 708
    | | | | | +-URI::Generic::userinfo called from #::open_http at 259
    | | | | | +-Kernel::require called from #::open_http at 267
    | | | | | | +-MonitorMixin::mon_enter called from Kernel::require at 39
    | | | | | | +-#::find_unresolved_default_spec called from Kernel::require at 43
    | | | | | | | \-#::suffixes called from #::find_unresolved_default_s
    | | | | | | +-#::unresolved_deps called from Kernel::require at
    | | | | | | +-#::stubs called from Kernel::require at 63
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    

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63. \-OpenURI::OpenRead::open called from Kernel::open at 34
    | \-#::open_uri called from OpenURI::OpenRead::open at 688
    | | +-#::scan_open_optional_arguments called from #::open_ur
    | | +-#::check_options called from #::open_uri at 136
    | | \-#::open_loop called from #::open_uri at 149
    | | | +-OpenURI::Buffer::initialize called from #::open_loop at 209
    | | | +-URI::HTTP::buffer_open called from #::open_loop at 195
    | | | | \-#::open_http called from URI::HTTP::buffer_open at 708
    | | | | | +-URI::Generic::userinfo called from #::open_http at 259
    | | | | | +-Kernel::require called from #::open_http at 267
    | | | | | | +-MonitorMixin::mon_enter called from Kernel::require at 39
    | | | | | | +-#::find_unresolved_default_spec called from Kernel::require at 43
    | | | | | | | \-#::suffixes called from #::find_unresolved_default_s
    | | | | | | +-#::unresolved_deps called from Kernel::require at
    | | | | | | +-#::stubs called from Kernel::require at 63
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    

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64. \-OpenURI::OpenRead::open called from Kernel::open at 34
    | \-#::open_uri called from OpenURI::OpenRead::open at 688
    | | +-#::scan_open_optional_arguments called from #::open_ur
    | | +-#::check_options called from #::open_uri at 136
    | | \-#::open_loop called from #::open_uri at 149
    | | | +-OpenURI::Buffer::initialize called from #::open_loop at 209
    | | | +-URI::HTTP::buffer_open called from #::open_loop at 195
    | | | | \-#::open_http called from URI::HTTP::buffer_open at 708
    | | | | | +-URI::Generic::userinfo called from #::open_http at 259
    | | | | | +-Kernel::require called from #::open_http at 267
    | | | | | | +-MonitorMixin::mon_enter called from Kernel::require at 39
    | | | | | | +-#::find_unresolved_default_spec called from Kernel::require at 43
    | | | | | | | \-#::suffixes called from #::find_unresolved_default_s
    | | | | | | +-#::unresolved_deps called from Kernel::require at
    | | | | | | +-#::stubs called from Kernel::require at 63
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    | | | | | | | \-Gem::StubSpecification::name called from Gem::StubSpecification::activated
    | | | | | | +-Gem::StubSpecification::activated? called from Kernel::require at 64
    

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65. | | | | | +-URI::Generic::hostname called from #::open_http at 278
    | | | | | +-URI::HTTP::request_uri called from #::open_http at 280
    | | | | | | \-URI::Generic::path_query called from URI::HTTP::request_uri at 96
    | | | | | +-#::new called from #::open_http at 291
    | | | | | | +-Net::HTTP::initialize called from #::new at 609
    | | | | | | \-#::proxy_class? called from #::new at 611
    | | | | | +-Net::HTTP::start called from #::open_http at 313
    | | | | | | +-Net::HTTP::do_start called from Net::HTTP::start at 851
    | | | | | | | \-Net::HTTP::connect called from Net::HTTP::do_start at 862
    | | | | | | | | +-Net::HTTP::proxy? called from Net::HTTP::connect at 868
    | | | | | | | | | \-Net::HTTP::proxy_uri called from Net::HTTP::proxy? at 1014
    | | | | | | | | | | +-Kernel::URI called from Net::HTTP::proxy_uri at 1027
    | | | | | | | | | | | \-#::parse called from Kernel::URI at 994
    | | | | | | | | | | | | \-URI::Parser::parse called from #::parse at 747
    | | | | | | | | | | | | | +-URI::Parser::split called from URI::Parser::parse at 211
    | | | | | | | | | | | | | +-#::scheme_list called from URI::Parser::parse at 21
    | | | | | | | | | | | | | +-#::scheme_list called from URI::Parser::parse at 21
    | | | | | | | | | | | | | \-URI::HTTP::initialize called from URI::Parser::parse at 660
    | | | | | | | | | | | | | | \-URI::Generic::initialize called from URI::HTTP::initialize a
    | | | | | | | | | | | | | | | +-URI::Generic::set_scheme called from URI::Generic::initial
    | | | | | | | | | | | | | | | +-URI::Generic::set_userinfo called from URI::Generic::initi
    

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66. http = klass.new(
    target_host,
    target_port
    )
    

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67. ➔ Trace the Calls
    ➔ Search the Source
    Dive into URI
    

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68. Search the Source
    $ grep -nr "open_http".
    ./open-uri.rb:253: def OpenURI.open_http(buf, target, proxy, option
    ./open-uri.rb:708: OpenURI.open_http(buf, self, proxy, options)
    ./open-uri.rb:717: OpenURI.open_http(buf, self, proxy, option
    

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69. Search the Source
    $ grep -rn "class HTTP " .
    ./net/http.rb:384: class HTTP < Protocol
    ./uri/http.rb:22: class HTTP < Generic
    

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70. Search the Source
    $ EDITOR=subl \
    bundle open gitlab_omniauth-ldap
    

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71. ➔ Trace the Calls
    ➔ Search the Source
    ➔ Get Context with a Test
    Dive into URI
    

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72. Get Context with a Test
    context "without params['markdown_img']" do
    it "returns an error" do
    TraceCalls::on do
    post :upload_image, id: project.to_param, format: :json
    end
    puts TraceCalls::root
    expect(response.status).to eq(422)
    end
    end
    

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73. Use your Toolbelt
    ➔ Run the App & Use it
    ➔ Read the Code
    ➔ Edit the Code
    

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74. http = proxy ?
    klass.new(target_host, target_port) :
    klass.new(target_host, target_port, nil)
    

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75. Use your Toolbelt
    ➔ Run the App & Use it
    ➔ Read & Edit the Code
    ➔ Report a bug
    ➔ Submit a contribution
    

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76. View Slide

77. If blocked?
    ➔ ASK!
    

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78. 4.
    Next?
    Peter Southwood © 20011
    

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79. How long?
    ➔ Keep it reasonable at first
    ➔ From ½ to 1 day
    

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80. Find Next Goal
    ➔ Fix a bug
    ➔ Develop a feature
    ➔ Run Static Analysis Tools
    ➔ Review a PullRequest
    

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81. Iterate
    ➔ :)
    Jean-Marc Kuffer © 2007
    

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82. If blocked?
    ➔ ASK!
    

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83. Outro
    1. Goal
    2. Map
    3. Equipment & Dive
    

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84. ?
    _toch
    toch
    

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