Net

Low level TCP library for Node.js

npm i @foxify/net

Usage

const turbo = require('@foxify/net')

// Echo server that allocates constant memory

const server = turbo.createServer(function (socket) {
  socket.read(Buffer.alloc(32 * 1024), function onread (err, buf, read) {
    if (err) throw err
    socket.write(buf, read, function (err) {
      if (err) throw err
      socket.read(buf, onread)
    })
  })
})

server.listen(8080, function () {
  const socket = turbo.connect(8080)

  socket.read(Buffer.alloc(32), function (err, buf, read) {
    if (err) throw err
    console.log(buf.toString('utf-8', 0, read))
  })
  socket.write(Buffer.from('hello world\n'))
})

Performance

Running the echo server examples in ./examples I get the following throughput on my laptop

• echo-classic: 1.3GB/s at ~100MB of ram
• echo-turbo: 3.4GB/s at ~35MB of ram

API

server = turbo.createServer([options], [onsocket])

Create a new TCP server. Options include:

{
  allowHalfOpen: false, // set to true to allow half open TCP connections
  reusePort: true // Disable if you don't want SO_REUSEPORT to be set (SO_REUSEADDR on windows)
}

server.on('connection', connection)

Emitted when a new connection is established.

server.on('listening')

Emitted when the server is listening.

server.connections

Unordered array containing the current active connections

server.listen(port, [address], [backlog], [onlistening])

Listen on a port.

server.address()

Similar to net.Server.address. Useful if you are listening on port 0, to find out which port was picked.

server.close([onclose])

Close the server.

connection = turbo.connect(port, host, [options])

Connect to a TCP server. Options include:

{
  allowHalfOpen: false // set to true to allow half open TCP connections
}

connection.on('connect')

Emitted when a client connection is fully connected.

connection.on('error', err)

Emitted when a client fails to connect.

connection.on('close')

Emitted a connection is fully closed. No other events will be emitted after.

connection.on('finish')

Emitted when the writable side is fully closed.

connection.on('end')

Emitted when the readable side is fully closed.

connection.on('timeout')

Emitted when the timeout it's reached. Is only a notification, you should end the connection.

connection.close([callback])

Closes the connection.

connection.read(buffer, callback)

Read data from the connection. Data will be read into the buffer you pass.

The callback is called with callback(err, buffer, bytesRead).

If bytesRead is 0, then the readable side of the connection has ended.

connection.write(buffer, [length], [callback])

Write data to the connection. Optionally you specify how many bytes in the buffer you want to write.

The callback is called with callback(err, buffer, length).

connection.writev(buffers, [lengths], [callback])

Write more than one buffer at once. Optionally you can specify how many bytes in each buffer you want to write.

The callback is called with callback(err, buffers, lengths).

connection.end([callback])

End the writable side of the connection.

connection.setTimeout(millis, [callback])

Set timeout on the connection. Optionally you can provide an callback. If millis is setted on 0, then it disabled.

connection.remoteAddress

The IP address of the connection. For example, '172.217.28.163'.

connection.remoteFamily

The IP family of the connection. Before the event "connect" or "connection" it's a empty string and after it's always "IPv4".

connection.remotePort

The remote port. For example, 63750.

License

MIT