session - 将 Kemal session 与 websocket 结合使用

Question

Crystal 中 Kemal Web 框架的 kemal-session 模块的文档提供了这个 example :

require "kemal"
require "kemal-session"

get "/set" do |env|
  env.session.int("number", rand(100)) # set the value of "number"
  "Random number set."
end

get "/get" do |env|
  num  = env.session.int("number") # get the value of "number"
  env.session.int?("hello") # get value or nil, like []?
  "Value of random number is #{num}."
end

Kemal.run

我正在使用 Kemal 和 Websocket .我有一个类似于以下示例的代码。如果我无权访问 env，我该如何使用 session ？

ws "/" do |socket|
  # Send welcome message to the client
  socket.send "Hello from Kemal!"

  # Handle incoming message and echo back to the client
  socket.on_message do |message|
    socket.send "Echo back from server #{message}"
  end

  # Executes when the client is disconnected. You can do the cleaning up here.
  socket.on_close do
    puts "Closing socket"
  end
end

Answer 1

Websocket 连接也产生上下文。您只需要像

这样从 block 中访问它

ws "/" do |socket, env|
  env.session.int?("hello")
end