Use Geth for contract tests

packages/dev-utils/src/blockchain_lifecycle.ts

@@ -1,6 +1,17 @@
 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[];
@@ -8,17 +19,47 @@ export class BlockchainLifecycle {
         this._web3Wrapper = web3Wrapper;
         this._snapshotIdsStack = [];
     }
-    // TODO: In order to run these tests on an actual node, we should check if we are running against
-    // TestRPC, if so, use snapshots, otherwise re-deploy contracts before every test
     public async startAsync(): Promise<void> {
-        const snapshotId = await this._web3Wrapper.takeSnapshotAsync();
-        this._snapshotIdsStack.push(snapshotId);
+        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: ${nodeType}`);
+        }
     }
     public async revertAsync(): Promise<void> {
-        const snapshotId = this._snapshotIdsStack.pop() as number;
-        const didRevert = await this._web3Wrapper.revertSnapshotAsync(snapshotId);
-        if (!didRevert) {
-            throw new Error(`Snapshot with id #${snapshotId} failed to revert`);
+        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}`);
         }
     }
 }

packages/dev-utils/src/web3_factory.ts

@@ -28,7 +28,7 @@ export const web3Factory = {
         if (!hasAddresses) {
             provider.addProvider(new EmptyWalletSubprovider());
         }
-        provider.addProvider(new FakeGasEstimateSubprovider(constants.GAS_LIMIT));
+        // provider.addProvider(new FakeGasEstimateSubprovider(constants.GAS_LIMIT));
         const logger = {
             log: (arg: any) => {
                 fs.appendFileSync('ganache.log', `${arg}\n`);