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phoenix lib phoenix socket message.ex
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lib/phoenix/socket/message.ex 

defmodule Phoenix.Socket.Message do

  use Jazz

  alias Phoenix.Socket.Message



  defstruct channel: nil, topic: nil, event: nil, message: nil



  defexception InvalidMessage, message: nil do

    def exception(opts) do

      %InvalidMessage{message: "Invalid Socket Message: #{inspect opts[:message]}"}

    end

  end



  @doc """

  Parse json message into required format, raise InvalidMessage if invalid



  The Message Protocol requires the following keys:

    * channel - The String Channel namespace, ie "messages"

    * topic - The String Topic namespace, ie "123"

    * event - The String event name, ie "join"

    * message - The String JSON message payload



  Returns The %Message{} parsed from JSON

  """

  def parse!(text) do

    try do

      json = JSON.decode!(text)



      %Message{

        channel: Dict.fetch!(json, "channel"),

        topic:   Dict.fetch!(json, "topic"),

        event:   Dict.fetch!(json, "event"),

        message: Dict.fetch!(json, "message")

      }

    rescue

      err in [KeyError]         -> raise InvalidMessage, message: "Missing key: '#{err.key}'"

      err in [JSON.SyntaxError] -> raise InvalidMessage, message: "Invalid JSON: #{err.message}"

    end

  end

end