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..023602bd6
--- /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;
+    }
+}