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A House of Cards - The Perils of Maintaining a 7-Year-Old Codebase
- 1. The Perils of Maintaining a 7-Year-Old Codebase A House of Cards Julie Gill @juliethethrill
- 4. Welcome to Many dependencies to set up + A pile of code + A ton of data
- 5. Lots to Learn What is real estate? What is all this code? What is all this data?
- 6. First GitHub Ticket I'm ready! Where to begin? Google doesn't help Detective work
- 7. Old Bugs Congrats, you found a 5-year-old bug - was it written like this on purpose? - did it ever work? - what else will break when I "fix" it? # TODO: make this not suck Specs help
- 8. StreetEasy Magic or Rails Magic Where is this logic coming from? Can Google help? url_for_model, link_to_dialog Area[“manhattan”] > def self.[](args) self.send(args[:filter], line)
- 9. Building a Feature How long is it going to take? Need to rebuild foundation code Domino effect
- 10. Building a House of Cards Fragile Careful examination Care, Caution, and Patience
Editor's Notes
- My name is julie juliethethrill Here to talk about large old codebases What does this have to do with a house of cards?
- Is this about that netflix show with kevin spacey? No
- I'm talking about this, a house made of carefully balanced playing cards Back up a little Graduated Pace CS Largest app, 10 models Freelance, school I built it all StreetEasy - 2005/2006 hundreds of models, billions of rows, pile of code This talk will hopefully prove an entertaining look at my first experience with huge old codebases How I have come to think of Large apps = house of cards, ready to crumble when you let your guard down
- A ton of data City data user data listing data recorded sale histories I had never seen so much data In fact, my first script that had to do with listing amenities ran out of memory I was shocked, and hadnt ever had so much data that I had to optimize just to get it to run.
- What is all this data? What does all this data mean? How does the code use it?
- Detective work Never had to Debug, understanding, or fix other peoples code Inspecting elements Following the trail of views and partials Tracing methods in the debugger several levels deep Learning to follow and understand obscure trains of thought is a large part of my job
- Specs help. Specs stop people from misusing your code Not spec'ing every piece of code But spec something you're afraid others will mess up
- Ah the metaprogramming Sending what to who? If you've never seen meta programming before, this line can be quite the doozy. Chase down the method that is being sent, chase down the params being sent.
- Domino effect Adding this feature might affect a distant piece of code somewhere Hopefully a spec will catch it If not, a really weird bug will soon pop up PAUSE
- When dealing with other peoples huge old codebases, exercise the same care, caution, and patience with your code that you would when remodeling or building onto a house of cards. Thank you.