bare-rpc

https://github.com/holepunchto/librpc ABI compatible RPC for Bare.

npm i bare-rpc

Usage

import RPC from 'bare-rpc'

// On one end
const rpc = new RPC(stream, (req) => {
  if (req.command === 42) {
    console.log(req.data.toString()) // ping
    req.reply('pong')
  }
})

// On the other end
const req = rpc.request(42)
req.send('ping')

const replyBuffer = await req.reply()
console.log(replyBuffer.toString()) // pong

API

RPC

const rpc = new RPC(stream[, onrequest])

Create an RPC instance using a duplex stream. onrequest is an optional callback run when a remote request is received. This is where processing and responding to an RPC request happens. onrequest receives a RPCIncomingRequest as an argument, for example:

const rpc = new RPC(stream, (req) => {
  if (req.command === 42) {
    req.reply('pong')
  }
})

See RPCIncomingRequest for properties and methods for processing the request.

onrequest can also be a RPCCommandRouter.

const req = rpc.request(command)

Create a request for command. command is a unique number that should be used to differentiate different requests on the remote end. Returns a RPCOutgoingRequest.

RPCOutgoingRequest

req.command

The command that the request was created with. A command is a unique number.

req.sent

A boolean for whether the request has been sent.

req.received

A boolean for whether the request has received a reply.

req.send([data[, encoding]])

Send the request with the provided data. data can be a buffer or a string which will be encoded using encoding.

.send() can only be called once per request.

const data = await req.reply([encoding])

Await the reply from the remote end to the request. encoding can be defined for decoding the response data buffer back into a string.

const stream = req.createRequestStream([options])

Create a Writable stream for sending data with the request.

const stream = req.createResponseStream([options])

Create a Readable stream for receiving data in reply to the request.

RPCIncomingRequest

req.command

The command that the request was sent as. A command is a unique number.

req.data

The data buffer sent with the request.

req.sent

A boolean for whether a reply has been sent.

req.received

A boolean for whether the request has been received as a stream. See req.createRequestStream() for receiving requests as a stream.

req.reply([data, [encoding]])

Reply to the request with the provided data. data can be a buffer or a string which will be encoded using encoding.

const stream = req.createRequestStream([options])

Create a Readable stream for receiving data from the request.

const stream = req.createResponseStream([options])

Create a Writable stream for sending data in reply to the request.

RPCCommandRouter

An alternative way to define commands and handlers for receiving them.

const router = new RPC.CommandRouter()

Create a new command router. This router can then be used when creating an rpc. For example:

const router = new RPC.CommandRouter()

router.respond(42, (req, data) => {
  console.log(data.toString()) // ping

  return Buffer.from('pong')
})

const rpc = new RPC(stream, router)
const req = rpc.request(42)
req.send('ping')

router.respond(command[, options], async (req, data) => {})

Define a command and the handler for it. The callback for a command receives both the request (req) and the data buffer and can return a value to respond. If the request is responded to in the callback, the return value is ignored.

Options include:

options = {
  // Encoding for incoming request
  requestEncoding: c.raw,
  // Encoding for outgoing response
  responseEncoding: c.raw
}

License

Apache-2.0