w20-2-statefull

gistfile1.coffee

net = require 'net'
 
server = net.createServer (con) ->
    con.setEncoding 'utf8'
    items = no
 
    process = (action, value) ->
        return "Commands: open, add, process" unless action in ["open", "add", "process"]
        if action == "open"
            return "order already exists" if items
            items = []
            return "opened"
        if action == "add"
            return "open order first" unless items
            return "nothing to add" unless value
            items.push value
            return "added"
        if action == "process"
            return "nothing to process" unless items
            [order, items] = [items, no]
            return "processed: #{order.join ", "}"
 
    con.on 'data', (data) ->
        [_, action, value] = /([^ ]+) ?(.*)/.exec(data).map?((x) -> x.trim()).filter((x) -> x != '')
        con.write process(action, value) + "\n"
 
server.listen 8080, () ->
    console.log "statefull server started"