Ruby sample scripts - sockets (examples from Ruby manual)
clnt.rb
# socket example - client side
# usage: ruby clnt.rb [host] port
require "socket"
if ARGV.length >= 2
host = ARGV.shift
else
host = "localhost"
end
print("Trying ", host, " ...")
STDOUT.flush
s = TCPSocket.open(host, ARGV.shift)
print(" done\n")
print("addr: ", s.addr.join(":"), "\n")
print("peer: ", s.peeraddr.join(":"), "\n")
while line = gets()
s.write(line)
print(s.readline)
end
s.close
svr.rb
# socket example - server side
# usage: ruby svr.rb
# this server might be blocked by an ill-behaved client.
# see tsvr.rb which is safe from client blocking.
require "socket"
gs = TCPserver.open(0)
addr = gs.addr
addr.shift
printf("server is on %s\n", addr.join(":"))
socks = [gs]
loop do
nsock = select(socks);
next if nsock == nil
for s in nsock[0]
if s == gs
ns = s.accept
socks.push(ns)
print(s, " is accepted\n")
else
if s.eof?
print(s, " is gone\n")
s.close
socks.delete(s)
# single thread gets may block whole service
elsif str = s.gets
s.write(str)
end
end
end
end
tsvr.rb
# socket example - server side using thread
# usage: ruby tsvr.rb
require "socket"
gs = TCPserver.open(0)
addr = gs.addr
addr.shift
printf("server is on %s\n", addr.join(":"))
loop do
Thread.start(gs.accept) do |s|
print(s, " is accepted\n")
while line = s.gets
s.write(line)
end
print(s, " is gone\n")
s.close
end
end