add rpc and interfaces

Author: danisharora099

packages/core/src/lib/metadata/rpc.ts

@@ -0,0 +1,38 @@
+import { proto_metadata as proto } from "@waku/proto";
+import type { Uint8ArrayList } from "uint8arraylist";
+import { v4 as uuid } from "uuid";
+
+export class MetadataRpc {
+  public constructor(public proto: proto.MetadataRpc) {}
+
+  static createRequest(
+    clusterId: number | undefined,
+    shards: number[]
+  ): MetadataRpc {
+    return new MetadataRpc({
+      requestId: uuid(),
+      request: {
+        clusterId: clusterId,
+        shards: shards
+      },
+      response: undefined
+    });
+  }
+
+  static decode(bytes: Uint8ArrayList): MetadataRpc {
+    const res = proto.MetadataRpc.decode(bytes);
+    return new MetadataRpc(res);
+  }
+
+  encode(): Uint8Array {
+    return proto.MetadataRpc.encode(this.proto);
+  }
+
+  get query(): proto.WakuMetadataRequest | undefined {
+    return this.proto.request;
+  }
+
+  get response(): proto.WakuMetadataResponse | undefined {
+    return this.proto.response;
+  }
+}