Created
January 6, 2018 09:19
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NIO4r ruby backend behaviour
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#!/usr/bin/env ruby | |
# frozen_string_literal: true | |
$LOAD_PATH.push File.expand_path("../../lib", __FILE__) | |
require "nio" | |
require "socket" | |
# Echo server example written with nio4r | |
class EchoServer | |
def initialize(host, port) | |
backend = ENV["NIO4R_PURE"] ? :ruby : nil | |
@selector = NIO::Selector.new backend | |
puts "use backend #{@selector.backend}" | |
puts "Listening on #{host}:#{port}" | |
@server = TCPServer.new(host, port) | |
monitor = @selector.register(@server, :r) | |
monitor.value = proc { accept } | |
@monitor = monitor | |
end | |
def run | |
loop do | |
# printing server readiness | |
puts "server readiness is #{ @monitor.readiness}" | |
@selector.select { |monitor| monitor.value.call(monitor) } | |
end | |
end | |
def accept | |
socket = @server.accept | |
_, port, host = socket.peeraddr | |
puts "*** #{host}:#{port} connected" | |
monitor = @selector.register(socket, :r) | |
monitor.value = proc { read(socket) } | |
end | |
def read(socket) | |
data = socket.read_nonblock(4096) | |
socket.write_nonblock(data) | |
rescue EOFError | |
_, port, host = socket.peeraddr | |
puts "*** #{host}:#{port} disconnected" | |
@selector.deregister(socket) | |
socket.close | |
end | |
end | |
EchoServer.new("localhost", 1234).run if $PROGRAM_NAME == __FILE__ | |
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