/usr/share/pyshared/albatross/simpleserver.py is in python-albatross 1.36-5.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright 2001 by Object Craft P/L, Melbourne, Australia.
#
# LICENCE - see LICENCE file distributed with this software for details.
#
import socket
import select
import random
import time
import binascii
import struct
import bisect
import sys
import getopt
import errno
import traceback
# Max consecutive server code failures a client can trigger before we
# close our connection to them.
MAX_CLIENT_EXCEPTIONS = 3
class Session:
def __init__(self, sesid, life):
self.sesid = sesid
self.life = life
self.text = ''
self.last_access = time.time()
def die_time(self):
return self.last_access + self.life
class SessionDict:
def __init__(self):
self.dict = {}
self.usage = 0
def new_session(self, sesid, life):
ses = Session(sesid, life)
self.dict[sesid] = ses
return ses
def set_session(self, sesid, text):
if sesid not in self.dict:
return
ses = self.dict[sesid]
self.usage = self.usage - len(ses.text) + len(text)
ses.text = text
ses.last_access = time.time()
def get_session(self, sesid, reset_access = 1):
ses = self.dict.get(sesid)
if ses and reset_access:
ses.last_access = time.time()
return ses
def del_session(self, sesid):
if sesid in self.dict:
self.usage = self.usage = len(self.dict[sesid].text)
del self.dict[sesid]
def has_session(self, sesid):
return sesid in self.dict
class SesLife:
def __init__(self, sesid, die_time):
self.sesid = sesid
self.die_time = die_time
def __cmp__(self, other):
return cmp(self.die_time, other.die_time)
class Reaper:
def __init__(self, sessions):
self.sessions = sessions
self.list = []
def add(self, sesid, life):
bisect.insort(self.list, SesLife(sesid, time.time() + life))
def process(self):
now = time.time()
while self.list:
event = self.list[0]
if event.die_time > now:
break
del self.list[0]
ses = self.sessions.get_session(event.sesid, 0)
if ses:
die_time = ses.die_time()
if die_time <= now:
self.sessions.del_session(event.sesid)
else:
event.die_time = die_time
bisect.insort(self.list, event)
if self.list:
event = self.list[0]
return event.die_time - now
class Context:
def __init__(self, log_file):
self.log_file = log_file
self.sessions = SessionDict()
self.reaper = Reaper(self.sessions)
self.read_files = []
self.write_files = []
def log(self, msg):
if self.log_file:
self.log_file.write(msg)
self.log_file.flush()
def add_write_file(self, file):
self.write_files.append(file)
def del_write_file(self, file):
try:
self.write_files.remove(file)
except ValueError:
pass
def add_read_file(self, file):
self.read_files.append(file)
def del_read_file(self, file):
try:
self.read_files.remove(file)
except ValueError:
pass
def del_file(self, file):
self.del_read_file(file)
self.del_write_file(file)
def select(self):
timeout = self.reaper.process()
try:
read_out, write_out, oob_out = \
select.select(self.read_files, self.write_files, [], timeout)
except select.error, (eno, estr):
if eno in (errno.EAGAIN, errno.EINTR):
return [], []
raise
return read_out, write_out
def reaper_add(self, sesid, life):
self.reaper.add(sesid, life)
def new_session(self, sesid, life):
return self.sessions.new_session(sesid, life)
def del_session(self, sesid):
return self.sessions.del_session(sesid)
def get_session(self, sesid):
ses = self.sessions.get_session(sesid)
if ses:
self.log("session get %s, %d bytes, %d total\n" % \
(sesid, len(ses.text), self.sessions.usage))
return ses
def set_session(self, sesid, text):
self.log("session put %s, %d bytes, %d total\n" % \
(sesid, len(text), self.sessions.usage))
return self.sessions.set_session(sesid, text)
def has_session(self, sesid):
return self.sessions.has_session(sesid)
COMMAND = 0
PUT = 1
class Client:
def __init__(self, context, sock, addr):
self.context = context
self.sock = sock
self.addr = addr
self.sock.setblocking(0)
self.input = ''
self.output = []
self.state = COMMAND
self.error_count = 0
self.context.log('new client: %s from %s\n' % (sock.fileno(), addr[0]))
def __del__(self):
self.context.log('del client: %s\n' % self.sock.fileno())
def fileno(self):
return self.sock.fileno()
def do_read(self):
try:
str = self.sock.recv(16384)
except socket.error:
return 0
if not str:
return 0
self.input = self.input + str
while 1:
if self.state == COMMAND:
pos = self.input.find('\r\n')
if pos < 0:
return 1
command = self.input[:pos]
self.input = self.input[pos + 2:]
if not self.handle_command(command):
return 0
elif self.state == PUT:
pos = self.input.find('\r\n\r\n')
if pos < 0:
return 1
text = self.input[:pos]
self.input = self.input[pos + 4:]
self.context.set_session(self.key, text)
self.write('OK\r\n')
self.state = COMMAND
def do_write(self):
while self.output:
str = self.output[0]
try:
num = self.sock.send(str)
except socket.error:
return 0
if num == len(str):
del self.output[0]
else:
self.output[0] = str[num:]
return 1
self.context.del_write_file(self)
return 1
def write(self, str):
if not self.output:
self.context.add_write_file(self)
self.output.append(str)
def make_sesid(self, app):
while 1:
try:
text = open('/dev/urandom').read(8)
except:
text = struct.pack('d', random.random())
sesid = binascii.hexlify(text)
if not self.context.get_session((app, sesid)):
return sesid
def handle_command(self, str):
self.context.log('client %s cmd: %s\n' % (self.sock.fileno(), str))
try:
words = str.split()
if not words:
return 1
cmd = words[0].lower()
if cmd == 'new' and len(words) == 3:
# new app life\r\n -> sesid\r\n
# generate a new session id
app = words[1]
try:
life = int(words[2])
except:
self.write('ERROR bad life\r\n')
return 1
sesid = self.make_sesid(words[1])
self.write('OK %s\r\n' % sesid)
key = (app, sesid)
self.context.new_session(key, life)
self.context.reaper_add(key, life)
elif cmd == 'get' and len(words) == 3:
# get app sesid\r\n -> text\r\n
# get the data for a session
app, sesid = words[1:]
key = (app, sesid)
ses = self.context.get_session(key)
if not ses:
self.write('ERROR no such session\r\n')
else:
self.write('OK - session follows\r\n')
self.write(ses.text)
self.write('\r\n\r\n')
elif cmd == 'put' and len(words) == 3:
# put app sesid\r\ntext\r\n -> OK\r\n
# put session data
app, sesid = words[1:]
key = (app, sesid)
if not self.context.has_session(key):
self.write('ERROR no such session\r\n')
else:
self.key = key
self.state = PUT
self.write('OK - send data now, terminate with blank line\r\n')
elif cmd == 'del' and len(words) == 3:
# del app sesid\r\n -> OK\r\n
# delete session
app, sesid = words[1:]
key = (app, sesid)
ses = self.context.get_session(key)
if not ses:
self.write('ERROR no such session\r\n')
else:
self.context.del_session(key)
self.write('OK\r\n')
elif cmd == 'quit' and len(words) == 1:
return 0
else:
self.write('ERROR unrecognised command: %s\r\n' % str)
if self.error_count > 0:
self.error_count -= 1
return 1
except:
self.error_count += 1
if self.error_count > MAX_CLIENT_EXCEPTIONS:
return 0
traceback.print_exc()
self.write('ERROR session server failure - check logs\r\n')
return 1
class Server:
def __init__(self, port, log_file):
self.context = Context(log_file)
self.listen_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.listen_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.listen_sock.setblocking(0)
self.listen_sock.bind(('', port))
self.listen_sock.listen(5)
self.context.add_read_file(self.listen_sock)
def select_loop(self):
self.run = 1
while self.run:
read_out, write_out = self.context.select()
for s in read_out:
if s is self.listen_sock:
c, addr = self.listen_sock.accept()
self.context.add_read_file(Client(self.context, c, addr))
del c # Otherwise socket won't be GC'ed in a timely manner
else:
if not s.do_read():
self.context.del_file(s)
for s in write_out:
if not s.do_write():
self.context.del_file(s)
read_out = write_out = s = None
def stop(self):
# This allows signal handlers to ask us to stop
self.run = 0
def usage():
sys.stderr.write('usage: session-server.py [-h] [-p port] [-l log-file]\n')
if __name__ == '__main__':
port = 34343
log_file = None
try:
opts, args = getopt.getopt(sys.argv[1:],
"hp:l:", ["help", "port=", "log="])
except getopt.GetoptError:
usage()
sys.exit(2)
for opt, arg in opts:
if opt in ("-h", "--help"):
usage()
sys.exit()
elif opt in ("-p", "--port"):
port = int(arg)
elif opt in ("-l", "--log"):
log_file = open(arg, 'a')
server = Server(port, log_file)
server.select_loop()
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