Under the Hood - C++ at Puppet Labs

Under the Hood - C++ at Puppet Labs, 2015-10-09

Transcript

1. UNDER THE HOOD: C++ AT PUPPET LABS Kylo Ginsberg Principal Engineer | Puppet Labs @kylog / freenode: kylo
2. When I Say C++ …
3. After this talk …
4. • Brief history of languages at Puppet Labs • Why C++? • C++ at Puppet Labs Today • Contributing • C++ at Puppet Labs Tomorrow Talk Overview: 5 Easy Pieces
5. BRIEF HISTORY OF LANGUAGES AT PUPPET LABS
6. Pre-History • Luke is writing what will become Puppet … • In Perl. • He discovers …
7. • Five minutes later …
8. • “Python makes my eyes bleed!”
9. Ruby: Puppet Takes Off • 2004: Luke starts developing in Ruby "I chose Ruby because it did the job the best for me during development” • And Puppet blossoms
10. Master Agent 2011 puppet.rb puppet.rb
11. Master Agent 2015 puppet.rb puppet.rb services.clj facter.cpp
12. WHY C++?
13. Language Selection Criteria • Portability • Performance, performance, performance • Footprint • Strong tooling and ecosystem • Developer Ease • Maintainable
14. Dynamic Typing for Fun and Profit
15. Statically typed language • Yes, you type ‘make’ • Yes, you fix compiler errors • Find failures at compile time not run time • Trades off development speed for stability • Intelligible code
16. C++ AT PUPPET LABS TODAY
17. Facter: our first major C++ project • Complete reimplementation of ruby facter • Initially opt-in, now the only option • Huge emphasis on backwards compatibility • Dynamic loading of ruby • Tighten / Document APIs • Cross-platform challenges: toolchains and APIs
18. Leatherman • Execution framework (for “shelling out”) • Dynamic library loading • Ruby loading • Wrapper for libcurl • Logging • Misc utilities: file, json, locale • CMake common code • Vendored: catch, rapidjson, nowide
19. Moar Repos • cpp-project-template • cpp-pcp-client • pxp-agent • horsewhisperer • libpuppetdb • cpp-hocon
20. CONTRIBUTING
21. C++ Misconceptions • Not the C++ you studied in school https://isocpp.org/std/status
22. C++ Sharp Edges • Best Practices • No bare allocations • Resource Acquisition Is Initialization (RAII) • #include <algorithm> • STL, Boost • Partially enforced by automated tooling • cpplint • -Wall -Werror • Travis / AppVeyor CI
23. https://github.com/isocpp/CppCoreGuidelines
24. Contributing to C++ Projects • Not so scary • Tooling support for popular platforms • e.g. docker pull kylo/centos7-pl-devel • cpp-project-template is good to start • IRC: #puppet-dev on freenode
25. C++ AT PUPPET LABS TOMORROW
26. End Goal: Agent Stack is All Native • What does “agent stack” mean? • puppet resource • puppet agent • puppet apply 1. Command Line Interface 2. Resource Abstraction Layer 3. Transaction 4. Puppet Compiler
27. Master Agent Core M odules
28. End Goal: Agent Stack is All Native • Four big components: what to tackle first? • Seeking feedback! • Join conversations on: puppet-dev@googlegroups.com
29. THANKS Adrien Thebo Alessandro Parisi Bostjan Skufca Branan Riley Brian Cain Chris Spence Dan Lidral-Porter David Lutterkort Eric Thompson Ethan J. Brown Geoff Nichols Glenn Matthews Hailee Kenney Heath Seals Ian Kronquist James Stocks Jasper Lievisse Adriaanse John Duarte Josh Cooper Josh Partlow Joshua Hoblitt Justin Holguin Justin Stoller Kevin Imber Kurt Wall Maggie Dreyer Matt Dainty Matthaus Owens Matthias Schmitz Melissa Stone Michael Moll Michael Smith Michael Stahnke Nick Fagerlund Paul Morgan Peter Huene Pieter Loubser Rahul Gopinath Richard Clamp Rick Bradley Rob Reynolds Roger Ignazio Ryan McKern Scott McClellan Shaigy Nixon Will Hopper
30. Goodnight, Gracie