cic-client
Version:
Typescript libraries for building CIC client applications
136 lines (135 loc) • 5.78 kB
JavaScript
;
/**
* Provides a representation of a token transfer transaction, aswell as a processor to detect transfer events.
*
* @module erc20
*/
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
exports.__esModule = true;
exports.topics = exports.Token = exports.Transfer = void 0;
var tx_1 = require("./tx");
var topics = {
'transfer': '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'
};
exports.topics = topics;
/**
* A Transfer instance represents a single ERC20 token transfer.
*
* @class Transfer
*/
var Transfer = /** @class */ (function () {
/**
*
* @param tx A transaction object
* @param token Ethereum address of ERC20 token transferred
* @param from Ethereum address of sender
* @param to Ethereum address of receipient
* @param value Value of transfer
*/
function Transfer(tx, token, from, to, value) {
this.from = from;
this.to = to;
this.token = token;
this.value = value;
this.tx = tx;
}
/**
* Scans a transaction log for transfer event.
*
* @static
* @param w3 A connected Web3 object
* @param success State of transaction
* @param token Token address to find transfer for
* @param log A Web3 transaction receipt logs array
* @return transfer Instance of Transfer if transfer is found, undefined if not.
*/
Transfer.processLog = function (w3, success, token, log) {
return __awaiter(this, void 0, void 0, function () {
var transfer, block, from, to, value, tx;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
transfer = undefined;
if (!(log.topics[0] == topics['transfer'])) return [3 /*break*/, 2];
return [4 /*yield*/, w3.eth.getBlock(log.blockNumber)];
case 1:
block = _a.sent();
from = w3.utils.toChecksumAddress(log.topics[1].substring(26, 66));
to = w3.utils.toChecksumAddress(log.topics[2].substring(26, 66));
value = BigInt(log.data);
tx = new tx_1.Tx(log.blockNumber, log.transactionIndex, log.transactionHash, block.timestamp, success);
transfer = new Transfer(tx, token, from, to, value);
_a.label = 2;
case 2: return [2 /*return*/, transfer];
}
});
});
};
return Transfer;
}());
exports.Transfer = Transfer;
/**
* Metadata for a single ERC20 token.
*
* @class Token
*
*/
var Token = /** @class */ (function () {
/**
*
* @param address Ethereum address of token contract
* @param name ERC20 token name
* @param symbol ERC20 token symbol
*/
function Token(address, name, symbol, decimals, totalSupply) {
this.address = address;
this.name = name;
this.symbol = symbol;
this.totalSupply = totalSupply;
this.decimals = decimals;
}
/**
* Informal string representation of token.
*
*/
Token.prototype.toString = function () {
return 'Token: ' + this.name + ' (' + this.symbol + ')';
};
return Token;
}());
exports.Token = Token;