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// Copyright (C) 2021 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This file defines the API of messages exchanged between frontend and
// {engine, controller} worker when bootstrapping the workers.
// Those messages are sent only once. The rest of the communication happens
// over the MessagePort(s) that are sent in the init message.
// This is so we can create all the workers in a central place in the frontend
// (Safari still doesn't spawning workers from other workers) but then let them
// communicate by sending the right MessagePort to them.
// Frontend -> Engine initialization message.
export interface EngineWorkerInitMessage {
// The port used to receive engine messages (e.g., query commands).
// The controller owns the other end of the MessageChannel
// (see resetEngineWorker()).
enginePort: MessagePort;
}
// Frontend -> Controller initialization message.
export interface ControllerWorkerInitMessage {
// For receiving dispatch() commands from the frontend. This is where most of
// the frontend <> controller interaction happens.
controllerPort: MessagePort;
// For controller <> Chrome extension communication.
extensionPort: MessagePort;
// For reporting errors back to the frontend. This is a dedicated port to
// reduce depdencies on the business logic behind the other ports.
errorReportingPort: MessagePort;
}
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