Note: I'm currently taking a break from this course to focus on my studies so I can finally graduate
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/** | |
* Base contract that all upgradeable contracts should use. | |
* | |
* Contracts implementing this interface are all called using delegatecall from | |
* a dispatcher. As a result, the _sizes and _dest variables are shared with the | |
* dispatcher contract, which allows the called contract to update these at will. | |
* | |
* _sizes is a map of function signatures to return value sizes. Due to EVM | |
* limitations, these need to be populated by the target contract, so the | |
* dispatcher knows how many bytes of data to return from called functions. |
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"use strict"; | |
/** | |
* @param {!Function.<!Promise>} action. | |
* @param {!Number | !string | !BigNumber} gasToUse. | |
* @returns {!Promise} which throws unless it hit a valid error. | |
*/ | |
module.exports = function expectedExceptionPromise(action, gasToUse) { | |
return new Promise(function (resolve, reject) { | |
try { |
Suppose you're writing a contract which involves a huge amount of participants. As an example, think of an online, blockchain-based Trading-Card Game with tournaments. How would you program a playCard
function? You might be thinking of something like this:
function playCard(uint player, uint card){
...
else if (card == PROFESSOR_OAK){
// shuffles the player's hand on his deck
shuffleHand(player)
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/*** | |
* Shoutouts: | |
* | |
* Bytecode origin https://www.reddit.com/r/ethereum/comments/6ic49q/any_assembly_programmers_willing_to_write_a/dj5ceuw/ | |
* Modified version of Vitalik's https://www.reddit.com/r/ethereum/comments/6c1jui/delegatecall_forwarders_how_to_save_5098_on/ | |
* Credits to Jorge Izquierdo (@izqui) for coming up with this design here: https://gist.github.com/izqui/7f904443e6d19c1ab52ec7f5ad46b3a8 | |
* Credits to Stefan George (@Georgi87) for inspiration for many of the improvements from Gnosis Safe: https://github.com/gnosis/gnosis-safe-contracts | |
* | |
* This version has many improvements over the original @izqui's library like using REVERT instead of THROWing on failed calls. | |
* It also implements the awesome design pattern for initializing code as seen in Gnosis Safe Factory: https://github.com/gnosis/gnosis-safe-contracts/blob/master/contracts/ProxyFactory.sol |
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// This is universal, works with Infura -- set provider accordingly | |
const ethers = require('ethers') | |
//const provider = ethers.getDefaultProvider('rinkeby') | |
const provider = new ethers.providers.JsonRpcProvider(process.env.WEB3_URL) | |
function hex_to_ascii(str1) { | |
var hex = str1.toString(); | |
var str = ''; | |
for (var n = 0; n < hex.length; n += 2) { |