yurishkuro

• What do Etcd, Consul, and Zookeeper do?
  • Service Registration:
    • Host, port number, and sometimes authentication credentials, protocols, versions numbers, and/or environment details.
  • Service Discovery:
    • Ability for client application to query the central registry to learn of service location.
  • Consistent and durable general-purpose K/V store across distributed system.
    • Some solutions support this better than others.
    • Based on Paxos or some derivative (i.e. Raft) algorithm to quickly converge to a consistent state.
• Centralized locking can be based on this K/V store.

arypurnomoz

apt-get update && apt-get install -y nginx;
echo '
  user www-data;
  worker_processes 4;
  pid /run/nginx.pid;
  events {
    worker_connections 768;
  }
  http {
    server {

wojteklu

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

---

General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

subfuzion

How to import and indicate empty request or reply messages:

import "google/protobuf/empty.proto";

service SomeService {
    rpc SomeOperation (google.protobuf.Empty) returns (google.protobuf.Empty) {}
}

Paradoxis

/**
 * Converts an HTTP(S) url to a WS(S) URL
 * Example:
 *     httpUrlToWebSockeUrl("http://www.example.com/") -> ws://www.example.com/
 *     httpUrlToWebSockeUrl("https://www.example.com/") -> wss://www.example.com/
 * 
 * @param {string} url
 * @return {string}
 */
function httpUrlToWebSockeUrl(url)

henriquemenezes

-- Get Max ID from table
SELECT MAX(id) FROM table;

-- Get Next ID from table
SELECT nextval('table_id_seq');

-- Set Next ID Value to MAX ID
SELECT setval('table_id_seq', (SELECT MAX(id) FROM table));

thewheat

Intercom user_hash

• Code for generating the user_hash value for Intercom's Identity verfication (Note: Identity verification was prevoiusly called Secure Mode)
• Based on http://www.jokecamp.com/blog/examples-of-creating-base64-hashes-using-hmac-sha256-in-different-languages/#ruby
• When creating this for mobile, the final output needs to be in lowercase (the web version accepts both upper and lower case)

Remember that your secret key should never be exposed to the public

• So Javascript code below should only be used for testing unless modified and used to run on a server

patik

Squashing Git Commits

The easy and flexible way

This method avoids merge conflicts if you have periodically pulled master into your branch. It also gives you the opportunity to squash into more than 1 commit, or to re-arrange your code into completely different commits (e.g. if you ended up working on three different features but the commits were not consecutive).

Note: You cannot use this method if you intend to open a pull request to merge your feature branch. This method requires committing directly to master.

Switch to the master branch and make sure you are up to date:

kwk

#!/bin/bash

JQPATH=$(which jq)
if [ "x$JQPATH" == "x" ]; then
  echo "Couldn't find jq executable." 1>&2
  exit 2
fi

set -eu
shopt -s nullglob

Qt-dev

var backendData = [
  {
    "title":"Section 1",
    "content":"Our content for the section 1"
  },
  {
    "title":"Section 2",
    "content":"Our content for the section 2"
  },
  {