Code - Fu: Defensive Programming
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Defensive programming is much like defensive driving. In a world where we have different developers collaborating on a single project, whether closed or open source, different ways of coding can impact on the end product. Defensive programming is a practice where one anticipates failures in coding and adds supporting code to detect, isolate and in some cases, recover from the ainticipated failure. In this presentation we illustrate a number of defensive programming techniques, along with a few generally bad programming examples you'll want to avoid.
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Defensive programming aims to anticipate failure points and improve software quality by making code more reliable, maintainable, and robust. It involves programming with the assumption that things can go wrong in the real world where software interacts with users and external systems. Defensive practices include validating external input, writing code with teams in mind through standards and modularity, adding error handling and logging, and assuming other developers' code could contain bugs. The goal is to create programs that work as intended and are protected from invalid or malicious data.
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Code - Fu: Defensive Programming
- 1. Code- Fu: Defensive Programming With great power comes great responsibility ~ Peter Paker’s Dad’s Brother Ben
- 2. 1980 A radiation therapy machine was directly responsible for at least 5 patient deaths 1996 A US$1 billion exploded 40 seconds after takeoff 2012 Apple Maps gives us directions to nowhere 2016 ABSA bank double charges clients Why learn another design pattern? Because: BUGS!
- 3. Intro to Code-Fu Defensive programming, simply put, is programming with the intent to anticipate likely failure points. Defensive programming practices are often used where high reliability, safety or security is needed.
- 4. Intro to Code-Fu cont... Defensive programming aims to improve software and source code, in terms of: 1. General quality (reduce bugs) 2. Comprehensive code a. Clean b. Readable c. Understandable d. Reliable e. Maintainable f. Testable g. Robustness 3. Predictable behaviour
- 5. Mastering the ways of Code-Fu Defensive programming is really programming for the real world where if anything can go wrong it will.
- 6. Real world programs 1. Are not in isolation, you can expect user input or external input 1. Are built & maintained by teams and the individuals making the team can change over time (imagine open source projects) 1. Need to work
- 7. External/User input ● Never trust external/user input ● Remember there are also users with malicious intent What helps ● Protect your code from invalid data (data validation) ● User whitelists not blacklists ● Use database abstraction (e.g. PDO for PHP)
- 8. We work in Teams ● Trust your fellow developers but DON’T trust their code ● Defensive Programming is much like Defensive Driving assume that everyone around us can potentially and possibly make mistakes. ● Teams can consists of individuals working from different planets What helps ● Enforcing coding standards (naming conversions included) ● Write SOLID code (Encapsulation) ● Write code for the maintainer (The maintainer can be future you) ● Parameter checks at the beginning of a function/method ● Unit tests, Regression testing, Integration tests
- 10. Check params + Encapsulation // ES5
- 11. Programs need to work ● Imagine paying R200 per month for Software that works 30% of the time What helps ● Add diagnostic code, logging and tracing (Bugsnag/Sentry) ● Security tests
- 12. As a Defensive programmer you need to have a healthy dosage of paranoia
- 14. Good/Bad?
- 15. QUESTIONS?