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Techs

• PaaS
  • heroku
    • Tips: http://blog.mah-lab.com/2013/05/16/heroku-commons-16/
• Slack bot
  • node-slack-sdk
    • Officially, no coffee-script, star=1200
  • botkit
    • Thriving community, no coffee-script, star=6000
  • Hubot
    • Big community, with coffee-script, star=12000
• DB
  • redis
    • by Redis Cloud in Heroku
    • node_redis
• Protocol
  • WebSocket
    • don't need express(=http), but web process in Procfile need http connection: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
    • Need to change the name: https://devcenter.heroku.com/articles/procfile#declaring-process-types
  • SocketIO
• free CI
  • Travis CI

Redis

To use heroku, not speed but efficiency.

Firstly,

• User score: to get the hash every question & language by qLangScores = hgetall(${userName}:s)
• Ranking:
  • each User: rankIndex = zcount(q + lang, 1, '(' + score)
  • best5: best5 = zrange(q + lang, 0, 4, 'WITHSCORES')