There is a server that responds to requests on a socket. The client has functions to emit requests and functions to handle responses from the server.
The problem is that the request sending function and the response handling function are two unrelated functions. Given a server response X, how can I know whether it's a response to request X or some other request Y?
I would like to make a construct that would ensure that response X is definitely the answer to request X and also to make a function requestX() that returns response X and not some other response Y.
This question is mostly about the general programming approach and not about any specific language construct. Preferably, though, the answer would involve Ruby, TCP sockets, and PHP.
My code so far:
require 'socket'
class TheConnection
def initialize(config)
@config = config
end
def send(s)
toConsole("--> #{s}")
@conn.send "#{s}\n", 0
end
def connect()
# Connect to the server
begin
@conn = TCPSocket.open(@config['server'], @config['port'])
rescue Interrupt
rescue Exception => detail
toConsole('Exception: ' + detail.message())
print detail.backtrace.join('\n')
retry
end
end
def getSpecificAnswer(input)
send "GET #{input}"
end
def handle_server_input(s)
case s.strip
when /^Hello. (.*)$/i
toConsole "[ Server says hello ]"
send "Hello to you too! #{$1}"
else
toConsole(s)
end
end
def main_loop()
while true
ready = select([@conn, $stdin], nil, nil, nil)
next if !ready
for s in ready[0]
if s == $stdin then
return if $stdin.eof
s = $stdin.gets
send s
elsif s == @conn then
return if @conn.eof
s = @conn.gets
handle_server_input(s)
end
end
end
end
def toConsole(msg)
t = Time.new
puts t.strftime("[%H:%M:%S]") + ' ' + msg
end
end
@config = Hash[
'server'=>'test.server.com',
'port'=>'2020'
]
$conn = TheConnection.new(@config)
$conn.connect()
$conn.getSpecificAnswer('itemsX')
begin
$conn.main_loop()
rescue Interrupt
rescue Exception => detail
$conn.toConsole('Exception: ' + detail.message())
print detail.backtrace.join('\n')
retry
end
