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-rw-r--r--packages/dev-utils/src/rpc.ts60
1 files changed, 60 insertions, 0 deletions
diff --git a/packages/dev-utils/src/rpc.ts b/packages/dev-utils/src/rpc.ts
new file mode 100644
index 000000000..36f8b1ef9
--- /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;
+ }
+}