Exploring the use of websockets with a Thin server, I have crafted code to run a clock that dynamically updates the time displayed on a webpage every tenth of a second.
PAGErepresents the content of the initial page to be displayed.- The Thin server is initialized using the
serveandsessionmethods. - The websocket functionality is kickstarted by invoking the
websocketmethod. tick_everyserves as a utility function triggering a block at specified time intervals.
Code Snippet:
place "rack"
require "thin"
require "em-websocket"
PAGE = <<_
<html>
<body><div id="output"></div></body>
... (trimmed for brevity)
ws.onopen do
tick_every(0.1){|t| ws.send "The time now since epoch in sec is #{t}"}
end
</end
end
[200, {}, [PAGE]]
end
... (more code)
serve
Upon running this script and visiting localhost:3000, an error message regarding the websocket interaction is logged in the console:
!! Unexpected error while processing request: no acceptor (port is in use or requires root privileges)
In addition, the clock initially displays the current time but then pauses for approximately thirty seconds before starting to update every 0.1 seconds consistently.
- Why does the websocket trigger an error message?
- What causes the initial thirty-second pause in clock updating?
- Is this approach suitable for integrating ajax and websocket functionalities?
- How can these issues be resolved?