44 lines
1.6 KiB
TypeScript
44 lines
1.6 KiB
TypeScript
import * as _ from 'lodash';
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import { constants } from './constants';
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import { web3Wrapper } from './web3_wrapper';
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let firstAccount: string | undefined;
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/**
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* Increases time by the given number of seconds and then mines a block so that
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* the current block timestamp has the offset applied.
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* @param seconds the number of seconds by which to incrase the time offset.
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* @returns a new Promise which will resolve with the new total time offset or
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* reject if the time could not be increased.
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*/
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export async function increaseTimeAndMineBlockAsync(seconds: number): Promise<number> {
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if (_.isUndefined(firstAccount)) {
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const accounts = await web3Wrapper.getAvailableAddressesAsync();
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firstAccount = accounts[0];
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}
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const offset = await web3Wrapper.increaseTimeAsync(seconds);
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// Note: we need to send a transaction after increasing time so
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// that a block is actually mined. The contract looks at the
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// last mined block for the timestamp.
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await web3Wrapper.awaitTransactionSuccessAsync(
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await web3Wrapper.sendTransactionAsync({ from: firstAccount, to: firstAccount, value: 0 }),
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constants.AWAIT_TRANSACTION_MINED_MS,
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);
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return offset;
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}
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/**
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* Returns the timestamp of the latest block in seconds since the Unix epoch.
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* @returns a new Promise which will resolve with the timestamp in seconds.
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*/
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export async function getLatestBlockTimestampAsync(): Promise<number> {
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const currentBlockIfExists = await web3Wrapper.getBlockIfExistsAsync('latest');
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if (_.isUndefined(currentBlockIfExists)) {
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throw new Error(`Unable to fetch latest block.`);
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}
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return currentBlockIfExists.timestamp;
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}
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