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a misty Gleam web server

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mist src mist internal http2 flow_control.gleam
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src/mist/internal/http2/flow_control.gleam 

import gleam/int



pub fn compute_receive_window(

  receive_window_size: Int,

  data_size: Int,

) -> #(Int, Int) {

  let new_receive_window_size = receive_window_size - data_size



  let max_window_increment = int.bitwise_shift_left(1, 31) - 1

  let max_window_size = max_window_increment

  let min_window_size = int.bitwise_shift_left(1, 30)



  case new_receive_window_size > min_window_size {

    True -> {

      #(new_receive_window_size, 0)

    }

    False -> {

      let updated_receive_window_size =

        int.min(new_receive_window_size + max_window_increment, max_window_size)

      let increment = updated_receive_window_size - new_receive_window_size



      #(updated_receive_window_size, increment)

    }

  }

}



pub fn update_send_window(

  current_send_window: Int,

  increment: Int,

) -> Result(Int, String) {

  let max_window_size = int.bitwise_shift_left(1, 31) - 1

  let update = current_send_window + increment

  case update > max_window_size {

    True -> Error("Invalid update increment")

    False -> Ok(update)

  }

}