@react-native-windows/automation-channel NPM | npm.io

0.12.304 • Published 9 months ago

Install

Weekly downloads

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License

MIT

Repository

Last release

9 months ago

@react-native-windows/automation-channel

@react-native-windows/automation-channel adds support for remote procedure calls from a node client to react-native-windows server on the same machine.

Example

node app

import {waitForConnection} from '@react-native-windows/automation-channel'

const rpcConnection = await waitForConnection({port: 8305});
const result = await rpcConnection.invoke("add", [2, 2])

react-native-windows app

#include "winrt/AutomationChannel.Server.h"

// AutomationChannel::CommandHandler allows registering methods
winrt::AutomationChannel::CommandHandler handler();

// Binding to a simple method
handler.BindOperation("add", [](const JSonValue& params) noexcept {
  auto addends = params.GetArray();

  auto sum = 0;
  for (const auto& addend : addends) {
    sum += addend.GetNumber();
  }
  
  return JSonValue::CreateNumberValue(sum);
});

// Methods may be bound to IAsyncAction or IAsyncOperation
handler.BindAsyncAction("performAsyncOperation", [](const JSonValue& params) noexcept -> IAsyncAction {
  co_await performLongOperation();
});

// Start server
winrt::AutomationChannel::Server rpcServer(handler);
co_await rpcServer.ProcessAllClientRequests(8305, 50ms);

Installing

@react-native-windows/automation-channel supports auto-linking to allow installation into react-native-windows applications.

Architecture

Reverse TCP server: Traditional server/client roles are reversed, where the node client creates a TCP server to connect to. This helps to bypass restrictions on inbound loopback traffic to UWP apps. This low-effort solution allows bypassing the UWP AppContainer.

Alternative approaches

Named pipe created inside AppContainer: Node provides first-class support for named-pipes through net.socket. It is possible to create a named pipe from a UWP process which a Win32 process can then connect to, allowing traditional server/client roles. Doing this requires locating the resource local to the AppContainer, using an API like GetAppContainerNamedObjectPath. This likely requires FFI (with node-gyp) or native extenssions.
Proxy to full-trust process The RNW application could create a full-trust process which proxies from TCP to named-pipe internal to the AppContainer. This bypasses inbound loopback restrictions, but adds complexity of deploying a separate process, requires two IPC channels.

Protocol

@react-native-windows/automation-channel uses a TCP channel, sending JSON messages across the wire prefixed with length. Messages themselves are conformant to the JSON-RPC version 2.0 protocol.

@typescript-eslint/eslint-plugin @typescript-eslint/parser jsonrpc-lite

@infinitebrahmanuniverse/nolb-_react-n @everything-registry/sub-chunk-766 @react-native-windows/automation-commands @react-native-windows/automation

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