sdogruyol

# Type inferred
def say(something)
  p something
end

# Explicit Type
def say(something : String)
  p something
end

sdogruyol

require "http/server"

SOCKETS = [] of HTTP::WebSocketHandler::WebSocketSession

ws_handler = HTTP::WebSocketHandler.new do |socket|
  puts "Socket opened"
  SOCKETS << socket

  socket.on_message do |message|
    SOCKETS.each { |socket| socket.send "Echo back from server: #{message}" }

sdogruyol

Crystal vs Node.js Websocket Benchmark

Crystal 0.9.1 with Kemal

require "kemal"

ws "/" do |socket|
  socket.on_message do |message|
 end

sdogruyol

This is done with a demo bootstrap static site which includes js, css

wrk is used for benchmarking with

wrk -c 100 -d 20 http://localhost:3000

Fast

Numbers speak louder than words.

sdogruyol

Kemal vs Sinatra Benchmark

This is just for demonstration purpose. A simple app just returning "Hello World". First in Kemal (Crystal) and then in Sinatra(Ruby with thin).

Kemal (Crystal)

Kemal Version: 0.6.0 Crystal Version: 0.10.0

sdogruyol

Kemal Crystal v0.10.0 vs new-fibers

This benchmark demonstrates the new-fibers improvements via Kemal.

# app.cr
require "kemal"

get "/" do
 "Hello World"

sdogruyol

require "kemal"
logging false

# OAuth Authorizations
get "/authorizations" do
  ""
end

get "/authorizations/:id" do
  ""

sdogruyol

require "kemal"

logging false

get "/" do
  "Hello World!"
end

sdogruyol

require "kemal"
require "benchmark"

def create_ws_request_and_return_io(handler, request)
  io = MemoryIO.new
  response = HTTP::Server::Response.new(io)
  context = HTTP::Server::Context.new(request, response)
  begin
    handler.call context
  rescue IO::Error

sdogruyol

require "benchmark"
require "json"

class MenuItem

  def self.all
    h =  {
        "name": "Serdar",
        "age": 27,
        "email": "[email protected]",