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-rw-r--r--packages/dev-utils/src/blockchain_lifecycle.ts23
-rw-r--r--packages/dev-utils/src/index.ts2
-rw-r--r--packages/dev-utils/src/rpc.ts60
3 files changed, 85 insertions, 0 deletions
diff --git a/packages/dev-utils/src/blockchain_lifecycle.ts b/packages/dev-utils/src/blockchain_lifecycle.ts
new file mode 100644
index 000000000..0e493eb48
--- /dev/null
+++ b/packages/dev-utils/src/blockchain_lifecycle.ts
@@ -0,0 +1,23 @@
+import {RPC} from './rpc';
+
+export class BlockchainLifecycle {
+ private rpc: RPC;
+ private snapshotIdsStack: number[];
+ constructor(url: string) {
+ this.rpc = new RPC(url);
+ 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.rpc.takeSnapshotAsync();
+ this.snapshotIdsStack.push(snapshotId);
+ }
+ public async revertAsync(): Promise<void> {
+ const snapshotId = this.snapshotIdsStack.pop() as number;
+ const didRevert = await this.rpc.revertSnapshotAsync(snapshotId);
+ if (!didRevert) {
+ throw new Error(`Snapshot with id #${snapshotId} failed to revert`);
+ }
+ }
+}
diff --git a/packages/dev-utils/src/index.ts b/packages/dev-utils/src/index.ts
new file mode 100644
index 000000000..97c5ebc0c
--- /dev/null
+++ b/packages/dev-utils/src/index.ts
@@ -0,0 +1,2 @@
+export {RPC} from './rpc';
+export {BlockchainLifecycle} from './blockchain_lifecycle';
diff --git a/packages/dev-utils/src/rpc.ts b/packages/dev-utils/src/rpc.ts
new file mode 100644
index 000000000..19834dbb4
--- /dev/null
+++ b/packages/dev-utils/src/rpc.ts
@@ -0,0 +1,60 @@
+import * as ethUtil from 'ethereumjs-util';
+import * as request from 'request-promise-native';
+
+export class RPC {
+ private url: string;
+ private id: number;
+ constructor(url: string) {
+ this.url = url;
+ this.id = 0;
+ }
+ public async takeSnapshotAsync(): Promise<number> {
+ const method = 'evm_snapshot';
+ const params: any[] = [];
+ const payload = this.toPayload(method, params);
+ const snapshotIdHex = await this.sendAsync(payload);
+ const snapshotId = ethUtil.bufferToInt(ethUtil.toBuffer(snapshotIdHex));
+ return snapshotId;
+ }
+ public async revertSnapshotAsync(snapshotId: number): Promise<boolean> {
+ const method = 'evm_revert';
+ const params = [snapshotId];
+ const payload = this.toPayload(method, params);
+ const didRevert = await this.sendAsync(payload);
+ return didRevert;
+ }
+ public async increaseTimeAsync(time: number) {
+ const method = 'evm_increaseTime';
+ const params = [time];
+ const payload = this.toPayload(method, params);
+ return this.sendAsync(payload);
+ }
+ public async mineBlockAsync(): Promise<void> {
+ const method = 'evm_mine';
+ const params: any[] = [];
+ const payload = this.toPayload(method, params);
+ await this.sendAsync(payload);
+ }
+ private toPayload(method: string, params: any[] = []): string {
+ const payload = JSON.stringify({
+ id: this.id,
+ method,
+ params,
+ });
+ this.id += 1;
+ return payload;
+ }
+ private async sendAsync(payload: string): Promise<any> {
+ const opts = {
+ method: 'POST',
+ uri: this.url,
+ body: payload,
+ headers: {
+ 'content-type': 'application/json',
+ },
+ };
+ const bodyString = await request(opts);
+ const body = JSON.parse(bodyString);
+ return body.result;
+ }
+}