95 lines
3.1 KiB
TypeScript
95 lines
3.1 KiB
TypeScript
import { TokenValue, Wei, toTokenBase } from 'libs/units';
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import { SagaIterator } from 'redux-saga';
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import { getEtherBalance, getTokenBalance } from 'selectors/wallet';
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import { getOffline, isNetworkUnit } from 'selectors/config';
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import { select, call } from 'redux-saga/effects';
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import { AppState } from 'reducers';
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import { getGasLimit, getGasPrice, getUnit, getDecimalFromUnit } from 'selectors/transaction';
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import {
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ITransaction,
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enoughBalanceViaTx,
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enoughTokensViaInput,
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makeTransaction
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} from 'libs/transaction';
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import { validNumber, validDecimal } from 'libs/validators';
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export interface IInput {
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raw: string;
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value: Wei | TokenValue | null;
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}
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/**
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* @description Takes in an input, and rebases it to a new decimal, rebases the raw input if it's a valid number. This is used in the process of switching units, as the previous invalid raw input of a user now may become valid depending if the user's balances on the new unit is high enough
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* @param {IInput} value
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* @returns {SagaIterator}
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*/
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export function* rebaseUserInput(value: IInput): SagaIterator {
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const unit: string = yield select(getUnit);
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// get decimal
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const newDecimal: number = yield select(getDecimalFromUnit, unit);
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if (validNumber(parseInt(value.raw, 10)) && validDecimal(value.raw, newDecimal)) {
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return {
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raw: value.raw,
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value: toTokenBase(value.raw, newDecimal)
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};
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} else {
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return {
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raw: value.raw,
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value: null
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};
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}
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}
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export function* validateInput(input: TokenValue | Wei | null, unit: string): SagaIterator {
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if (!input) {
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return false;
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}
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const etherBalance: Wei | null = yield select(getEtherBalance);
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const isOffline: boolean = yield select(getOffline);
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const networkUnitTransaction: boolean = yield select(isNetworkUnit, unit);
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if (isOffline || !etherBalance) {
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return true;
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}
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let valid = true;
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// TODO: do gas estimation here if we're switching to a token too, it should cover the last edge case
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//make a new transaction for validating ether balances
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const validationTx = networkUnitTransaction
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? yield call(makeCostCalculationTx, input)
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: yield call(makeCostCalculationTx, null);
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// check that they have enough ether, this checks gas cost too
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valid = valid && enoughBalanceViaTx(validationTx, etherBalance);
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if (!networkUnitTransaction) {
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const tokenBalance: TokenValue | null = yield select(getTokenBalance, unit);
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valid = valid && enoughTokensViaInput(input, tokenBalance);
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}
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return valid;
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}
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/**
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* @description Creates a minimum viable transaction for calculating costs for validating user balances
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* @param {(Wei | null)} value
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* @returns {SagaIterator}
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*/
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export function* makeCostCalculationTx(
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value: AppState['transaction']['fields']['value']['value']
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): SagaIterator {
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const gasLimit: AppState['transaction']['fields']['gasLimit'] = yield select(getGasLimit);
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const gasPrice: AppState['transaction']['fields']['gasPrice'] = yield select(getGasPrice);
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const txObj: Partial<ITransaction> = {
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gasLimit: gasLimit.value || undefined,
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gasPrice: gasPrice.value || undefined,
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value
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};
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return yield call(makeTransaction, txObj);
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}
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