Andy Chen amazingandyyy

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

QTUM Prediction
1. Dont know event status when browsing
2. after clicking, showing The betting start time has not started yet
Withdraw
1. Don’t he withdraw(can withdraw, withdrawn) status when browsing
User jumping around(which is not good) QTUM Bet, Result Set, BOT Court, Finalize


	➜ minted_proto git:(update_minto_compile) ✗ prototool lint --list-linters
	COMMENTS_NO_C_STYLE Verifies that there are no /* c-style */ comments.
	COMMENTS_NO_INLINE Verifies that there are no inline comments.
	ENUMS_HAVE_SENTENCE_COMMENTS Verifies that all enums have a comment that contains at least one complete sentence.
	ENUMS_NO_ALLOW_ALIAS Verifies that no enums use the option “allow_alias”.
	ENUM_FIELD_NAMES_UPPER_SNAKE_CASE Verifies that all enum field names are UPPER_SNAKE_CASE.
	ENUM_FIELD_PREFIXES_EXCEPT_MESSAGE Verifies that all enum fields are prefixed with ENUM_NAME_.
	ENUM_NAMES_CAMEL_CASE Verifies that all enum names are CamelCase.
	ENUM_NAMES_CAPITALIZED Verifies that all enum names are Capitalized.

	ZEIT makes global deployment accessible to everyone.
	sudo wants to make secret management accessible to every ZEIT user.

	ZEIT integration Hackathon 06/01-06/02: https://zeit.co/hackathon
	ZEIT sudo Team: https://github.com/zeit-sudo
	Github Source: https://github.com/zeit-sudo/ui
	Install on ZEIT: https://zeit.co/integrations/zeit-sudo-test

	# https://stackoverflow.com/questions/41573277/extract-count-of-a-string-in-log-file-using-grep

	while sleep 1; do
	attemps=$(grep -A 2 "KAFKA_CLIENT_PRODUCER_ATTEMPT" /srv/minted/logs/www-wsgi.log \| grep -c "KAFKA_CLIENT_PRODUCER_ATTEMPT")
	sent=$(grep -A 2 "KAFKA_CLIENT_PRODUCER_GOOD" /srv/minted/logs/www-wsgi.log \| grep -c "KAFKA_CLIENT_PRODUCER_GOOD")
	fail=$(grep -A 2 "KAFKA_CLIENT_PRODUCER_BAD" /srv/minted/logs/www-wsgi.log \| grep -c "KAFKA_CLIENT_PRODUCER_BAD")
	echo $sent / $attemps
	done;

	const ethUtil = require("ethereumjs-util");
	function personalSign(privateKey, msgParams) {
	var message = ethUtil.toBuffer(msgParams.data)
	var msgHash = ethUtil.hashPersonalMessage(message)
	var sig = ethUtil.ecsign(msgHash, privateKey)
	var serialized = ethUtil.bufferToHex(this.concatSig(sig.v, sig.r, sig.s))
	return serialized
	}
	function concatSig(v, r, s) {
	const rSig = ethUtil.fromSigned(r)

	2004 mutiple touch -> iPhone

	2008 -> Bitcoin 比特幣 -> 貨幣 $100, $500
	2016 -> Ethereum 以太坊 ===> ether 以太 $300 USD
	-> App -> "I love you", $5 - $50 ---> $500


	2018 ======== - 比 - 較 - 好 - 用 - =========
	VechainThor 唯鏈索爾 ===> vtho 索爾幣 $0.004 USD, $0.00001622 ether
	* Multi Payment Protocol ->

	const accounts = await web3.eth.getAccounts();
	const instance = new web3.eth.Contract(ABI,address)
	instance.methods.functionName(params).send({
	from: accounts[0],
	gas: '1000000'
	});

	async init() {
	this.loading = true;
	this.ui = new UiStore();
	this.wallet = new WalletStore(this);
	this.walletHistory = new WalletHistoryStore();
	this.pubsub = new PubSubStore(this);

	await this.pubsub.getSyncInfo();
	runInAction(() => {
	this.allEvents = new AllEventsStore(this);