1 files changed, 43 insertions, 0 deletions
diff --git a/packages/contracts/util/rpc.ts b/packages/contracts/util/rpc.ts
new file mode 100644
index 000000000..37643874c
--- /dev/null
+++ b/packages/contracts/util/rpc.ts
@@ -0,0 +1,43 @@
+import 'isomorphic-fetch';
+
+import * as truffleConf from '../truffle.js';
+
+export class RPC {
+  private host: string;
+  private port: number;
+  private id: number;
+  constructor() {
+    this.host = truffleConf.networks.development.host;
+    this.port = truffleConf.networks.development.port;
+    this.id = 0;
+  }
+  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() {
+    const method = 'evm_mine';
+    const payload = this.toPayload(method);
+    return this.sendAsync(payload);
+  }
+  private toPayload(method: string, params: any[] = []) {
+    const payload = JSON.stringify({
+      id: this.id,
+      method,
+      params,
+    });
+    this.id++;
+    return payload;
+  }
+  private async sendAsync(payload: string): Promise<any> {
+    const opts = {
+      method: 'POST',
+      body: payload,
+    };
+    const response = await fetch(`http://${this.host}:${this.port}`, opts);
+    const responsePayload = await response.json();
+    return responsePayload;
+  }
+}