Test Failed, Then...
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Pycon APAC presentation on optimizing inter-component communication and inter-engineer communication.
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Test Failed, Then...
- 1. Test Failed, Then... Optimizing communication between people Toru Furukawa" @torufurukawa"
- 2. Agenda • Introduction Web app syncing with live TV show" • Loose coupling" • Testable components" • Efficient communication"
- 4. Agile App Development on Concrete Backend Services HTML App" App Server Backend Service(s)" Project dependent Common
- 5. Because... • Requirements keep changing" • Not only Web, but also TV" • Not only TV, but also Web" • Spiky access traffic" • Common fundamental features" ▼" • Easy to change application" • Well tested platform"
- 6. Ended up with… HTML App" App Server Counter" Messenger"
- 7. High Communication Cost "Communication overheads increase as the number of people increases." F. Brooks"
- 8. Minimal and Effective Communication
- 9. Optimize Communication • Between Components" • Between People
- 11. How to Simplify Dependency? HTML App" App Server Counter" Messenger"
- 12. PHP • IMPORTANT: PHP is fine" • Cannot be combined with Python component in language layer easily
- 13. Loose Coupling "Write small services that speak HTTP and bridge them together with another application."" Armin Ronacher (@mitsuhiko)" http://lucumr.pocoo.org/2010/12/24/common-mistakes-as-web-developer/
- 14. Loose Coupling HTML App" (JavaScript) App Server" (whatever) Counter" (Python) Messenger" (Node.js) HTTP
- 15. Assign Engineer for Component HTML App" (JavaScript) App Server" (whatever) Counter" (Python) Messenger" (Node.js) HTTP
- 18. Wrap Engineers' Communication • New layers to simplify inter-component communication" • Assign new roles to simplify inter-people communication
- 19. HTML App" (JavaScript) App Server" (whatever) Counter" (Python) Messenger" (Node.js) Server/Server Communication" (Python) Client/Server Communication
- 22. If a servicewise feature does not work, how to identify the cause?" • Ask developer to check logs?" • Ask developer to check DB?" ▼" Make component diagnosable" Instrument Components
- 23. Log with fluentd App Server" (whatever) Counter" (Python) Messenger" (Node.js) fluentd Mongo DB Web App
- 24. Define CRUD APIs • Make DB accessible from test and admin • REST /objects/:id" • /get_objects /get_object, /set_object, /delete_object" ▼" • Diagnose 1-layer deeper from outside"
- 25. "requests" package for Web API Access >>> r = requests.get(url, auth=(...), ...) >>> r = requests.post(url, data={...}, ...) >>> r.status_code 200 >>> r.content u'{"foo":"bar","x":true}' >>> r.json() {u'foo': u'bar', 'x': True}
- 26. Library for Productivity • Use testing libraries to increase productivity i.e. how many test you write per hour" • setup and teardown" – unittest" – nose" – py.test" – testfixtures" – etc.
- 28. Translate Test Report Traceback (most recent call last): File "mytest.py", line 7, in test assert result == expected AssertionError ▼" • How do YOU determine what is wrong?" • How do you tell OTHERS what is wrong?" ▼" • Need better way to communicate
- 29. Library for Readability class MyTest(unittest.TestCase): def test(self): expected = {...} result = {...} self.assertEqual(x, y) " "
- 30. Traceback (most recent call last): File "mytest.py", line 7, in test self.assertEqual(x, y) AssertionError: {'items': ['spam', 'spam'], 'foo': 'bar'} != {'items': ['spam', 'ham'], 'foo': 'bar'} -‐ {'foo': 'bar', 'items': ['spam', 'spam']} ? ^^ + {'foo': 'bar', 'items': ['spam', 'ham']} ? ^
- 31. Python vs HTTP Python HTTP Test Fast Loosely Couple Develop Fast
- 32. If I stick to Python too much, my communication is tightly coupled
- 33. Convert requests function to curl >>> import curledrequests as requests >>> requests.debug = True >>> r = requests.get( ... 'http://www.google.com/', ... params={'q':'python'}) ... $ curl “http://www.google.com/?q=python” -‐w 'n%{http_code}n' <!doctype html><html itemscope="" itemtype="http://schema.org/WebPage"><head><me ... 200 h5p://goo.gl/hO579O
- 35. Loosely Couple Components and Engineers
- 36. Share Your Practice @torufurukawa or grab me"