Class: MilkTea::Run::WasmPreviewServer

Inherits:
Object
  • Object
show all
Defined in:
lib/milk_tea/tooling/run.rb

Constant Summary collapse

HOST = 
"127.0.0.1"
DEFAULT_IDLE_TIMEOUT = 
600

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(root_dir:, host: HOST, port: nil, idle_timeout: DEFAULT_IDLE_TIMEOUT) ⇒ WasmPreviewServer

Returns a new instance of WasmPreviewServer.



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# File 'lib/milk_tea/tooling/run.rb', line 15

def initialize(root_dir:, host: HOST, port: nil, idle_timeout: DEFAULT_IDLE_TIMEOUT)
  @root_dir = File.expand_path(root_dir)
  @host = host
  @port = port
  @idle_timeout = idle_timeout
  @thread = nil
  @server = nil
  @running = false
end

Instance Attribute Details

#host ⇒ Object (readonly)

Returns the value of attribute host.



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# File 'lib/milk_tea/tooling/run.rb', line 25

def host
  @host
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/milk_tea/tooling/run.rb', line 25

def port
  @port
end

Instance Method Details

#close_server ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 200

def close_server
  @server&.close
rescue IOError, Errno::EBADF
  nil
ensure
  @server = nil
end

#default_entry_name ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 136

def default_entry_name
  html_entries = Dir.children(@root_dir).grep(/\.html\z/).sort
  html_entries.first || "index.html"
end

#handle_client(socket) ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 90

def handle_client(socket)
  request_line = socket.gets
  return unless request_line

  method, target, = request_line.split(" ", 3)
  while (header = socket.gets)
    break if header == "\r\n"
  end

  unless ["GET", "HEAD"].include?(method)
    write_response(socket, 405, "Method Not Allowed", "method not allowed\n")
    return
  end

  path = resolve_request_path(target)
  unless path && File.file?(path)
    write_response(socket, 404, "Not Found", "not found\n")
    return
  end

  body = File.binread(path)
  headers = {
    "Content-Type" => mime_type_for(path),
    "Content-Length" => body.bytesize.to_s,
    "Cache-Control" => "no-cache",
    "Cross-Origin-Opener-Policy" => "same-origin",
    "Cross-Origin-Embedder-Policy" => "require-corp",
    "Connection" => "close",
  }

  socket.write("HTTP/1.1 200 OK\r\n")
  headers.each { |name, value| socket.write("#{name}: #{value}\r\n") }
  socket.write("\r\n")
  socket.write(body) if method == "GET"
end

#install_signal_handlers ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 176

def install_signal_handlers
  {
    "TERM" => Signal.trap("TERM") { @running = false },
    "INT" => Signal.trap("INT") { @running = false },
  }
end

#listen! ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 47

def listen!
  return self if @server

  @server = TCPServer.new(@host, @port || 0)
  @port = @server.addr[1]
  self
end

#mime_type_for(path) ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 141

def mime_type_for(path)
  case File.extname(path)
  when ".html"
    "text/html; charset=utf-8"
  when ".js"
    "text/javascript; charset=utf-8"
  when ".css"
    "text/css; charset=utf-8"
  when ".json", ".mtdbg.json"
    "application/json; charset=utf-8"
  when ".wasm"
    "application/wasm"
  when ".wav"
    "audio/wav"
  when ".png"
    "image/png"
  when ".ppm"
    "image/x-portable-pixmap"
  else
    "application/octet-stream"
  end
end

#resolve_request_path(target) ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 126

def resolve_request_path(target)
  request_path = target.to_s.split("?", 2).first
  request_path = "/" if request_path.empty?
  relative = request_path == "/" ? default_entry_name : request_path.delete_prefix("/")
  candidate = File.expand_path(relative, @root_dir)
  return nil unless candidate.start_with?(@root_dir + File::SEPARATOR) || candidate == @root_dir

  candidate
end

#restore_signal_handlers(previous_handlers) ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 183

def restore_signal_handlers(previous_handlers)
  previous_handlers.each do |signal_name, handler|
    Signal.trap(signal_name, handler)
  end
rescue ArgumentError
  nil
end

#serve_forever(trap_signals: true) ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 61

def serve_forever(trap_signals: true)
  listen!
  @running = true
  previous_handlers = trap_signals ? install_signal_handlers : nil
  last_request_at = Time.now

  while @running
    if @idle_timeout.positive? && Time.now - last_request_at > @idle_timeout
      break
    end

    readable, = IO.select([@server], nil, nil, 0.25)
    next unless readable

    client = @server.accept
    Thread.new(client) do |socket|
      begin
        handle_client(socket)
      ensure
        last_request_at = Time.now
        socket.close unless socket.closed?
      end
    end
  end
ensure
  close_server
  restore_signal_handlers(previous_handlers) if previous_handlers
end

#start ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 27

def start
  listen!
  @thread = Thread.new { serve_forever(trap_signals: false) }
  self
rescue StandardError
  stop
  raise
end

#stop ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 36

def stop
  @running = false
  if @thread
    wake_server
    @thread.join(1)
  end
  @thread = nil
  close_server
  nil
end

#url_for(entry_name) ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/run.rb', line 55

def url_for(entry_name)
  raise RunError, "wasm preview server has not been started" unless @port

  "http://#{@host}:#{@port}/#{entry_name}"
end

#wake_server ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 191

def wake_server
  return unless @server && @port

  socket = TCPSocket.new(@host, @port)
  socket.close
rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
  nil
end

#write_response(socket, status, message, body) ⇒ Object 



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# File 'lib/milk_tea/tooling/run.rb', line 164

def write_response(socket, status, message, body)
  body ||= ""
  socket.write("HTTP/1.1 #{status} #{message}\r\n")
  socket.write("Content-Type: text/plain; charset=utf-8\r\n")
  socket.write("Content-Length: #{body.bytesize}\r\n")
  socket.write("Cross-Origin-Opener-Policy: same-origin\r\n")
  socket.write("Cross-Origin-Embedder-Policy: require-corp\r\n")
  socket.write("Connection: close\r\n")
  socket.write("\r\n")
  socket.write(body)
end