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import { Web3Wrapper } from '@0xproject/web3-wrapper';
import * as _ from 'lodash';
import * as Web3 from 'web3';
enum NodeType {
Geth = 'GETH',
Ganache = 'GANACHE',
}
// These are unique identifiers contained in the response of the
// web3_clientVersion call.
const GETH_VERSION_ID = 'Geth';
const GANACHE_VERSION_ID = 'EthereumJS TestRPC';
export class BlockchainLifecycle {
private _web3Wrapper: Web3Wrapper;
private _snapshotIdsStack: number[];
constructor(web3Wrapper: Web3Wrapper) {
this._web3Wrapper = web3Wrapper;
this._snapshotIdsStack = [];
}
public async startAsync(): Promise<void> {
const nodeType = await this._getNodeTypeAsync();
switch (nodeType) {
case NodeType.Ganache:
const snapshotId = await this._web3Wrapper.takeSnapshotAsync();
this._snapshotIdsStack.push(snapshotId);
break;
case NodeType.Geth:
const blockNumber = await this._web3Wrapper.getBlockNumberAsync();
this._snapshotIdsStack.push(blockNumber);
break;
default:
throw new Error(`Unknown node type: ${nodeType}`);
}
}
public async revertAsync(): Promise<void> {
const nodeType = await this._getNodeTypeAsync();
switch (nodeType) {
case NodeType.Ganache:
const snapshotId = this._snapshotIdsStack.pop() as number;
const didRevert = await this._web3Wrapper.revertSnapshotAsync(snapshotId);
if (!didRevert) {
throw new Error(`Snapshot with id #${snapshotId} failed to revert`);
}
break;
case NodeType.Geth:
const blockNumber = this._snapshotIdsStack.pop() as number;
await this._web3Wrapper.setHeadAsync(blockNumber);
break;
default:
throw new Error(`Unknown node type: ${nodeType}`);
}
}
private async _getNodeTypeAsync(): Promise<NodeType> {
const version = await this._web3Wrapper.getNodeVersionAsync();
if (_.includes(version, GETH_VERSION_ID)) {
return NodeType.Geth;
} else if (_.includes(version, GANACHE_VERSION_ID)) {
return NodeType.Ganache;
} else {
throw new Error(`Unknown client version: ${version}`);
}
}
}
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