Chip 2007 January, February, March & April/Chip-Cover-CD-2007-02.iso/Pakiet bezpieczenstwa/mini Pentoo LiveCD 2006.1/mpentoo-2006.1.iso/livecd.squashfs/usr/lib/python2.4/asyncore.pyc

Python Compiled Bytecode | 2005-10-18 | 15KB | 582 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.4)

'''Basic infrastructure for asynchronous socket service clients and servers.

There are only two ways to have a program on a single processor do "more
than one thing at a time".  Multi-threaded programming is the simplest and
most popular way to do it, but there is another very different technique,
that lets you have nearly all the advantages of multi-threading, without
actually using multiple threads. it\'s really only practical if your program
is largely I/O bound. If your program is CPU bound, then pre-emptive
scheduled threads are probably what you really need. Network servers are
rarely CPU-bound, however.

If your operating system supports the select() system call in its I/O
library (and nearly all do), then you can use it to juggle multiple
communication channels at once; doing other work while your I/O is taking
place in the "background."  Although this strategy can seem strange and
complex, especially at first, it is in many ways easier to understand and
control than multi-threaded programming. The module documented here solves
many of the difficult problems for you, making the task of building
sophisticated high-performance network servers and clients a snap.
'''
import exceptions
import select
import socket
import sys
import time
import os
from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, ENOTCONN, ESHUTDOWN, EINTR, EISCONN, errorcode

try:
    socket_map
except NameError:
    socket_map = { }


class ExitNow(exceptions.Exception):
    pass


def read(obj):

    try:
        obj.handle_read_event()
    except ExitNow:
        raise
    except:
        obj.handle_error()



def write(obj):

    try:
        obj.handle_write_event()
    except ExitNow:
        raise
    except:
        obj.handle_error()



def _exception(obj):

    try:
        obj.handle_expt_event()
    except ExitNow:
        raise
    except:
        obj.handle_error()



def readwrite(obj, flags):

    try:
        if flags & (select.POLLIN | select.POLLPRI):
            obj.handle_read_event()

        if flags & select.POLLOUT:
            obj.handle_write_event()

        if flags & (select.POLLERR | select.POLLHUP | select.POLLNVAL):
            obj.handle_expt_event()
    except ExitNow:
        raise
    except:
        obj.handle_error()



def poll(timeout = 0.0, map = None):
    if map is None:
        map = socket_map

    if map:
        r = []
        w = []
        e = []
        for fd, obj in map.items():
            is_r = obj.readable()
            is_w = obj.writable()
            if is_r:
                r.append(fd)

            if is_w:
                w.append(fd)

            if is_r or is_w:
                e.append(fd)
                continue

        if r == r and w == w:
            pass
        elif w == e:
            time.sleep(timeout)
        else:

            try:
                (r, w, e) = select.select(r, w, e, timeout)
            except select.error:
                []
                err = []
                if err[0] != EINTR:
                    raise
                else:
                    return None
            except:
                err[0] != EINTR

        for fd in r:
            obj = map.get(fd)
            read(obj)

        for fd in w:
            obj = map.get(fd)
            if obj is None:
                continue

            write(obj)

        for fd in e:
            obj = map.get(fd)
            if obj is None:
                continue

            _exception(obj)




def poll2(timeout = 0.0, map = None):
    if map is None:
        map = socket_map

    if timeout is not None:
        timeout = int(timeout * 1000)

    pollster = select.poll()
    if map:
        for fd, obj in map.items():
            flags = 0
            if obj.readable():
                flags |= select.POLLIN | select.POLLPRI

            if obj.writable():
                flags |= select.POLLOUT

            if flags:
                flags |= select.POLLERR | select.POLLHUP | select.POLLNVAL
                pollster.register(fd, flags)
                continue


        try:
            r = pollster.poll(timeout)
        except select.error:
            err = None
            if err[0] != EINTR:
                raise

            r = []

        for fd, flags in r:
            obj = map.get(fd)
            if obj is None:
                continue

            readwrite(obj, flags)



poll3 = poll2

def loop(timeout = 30.0, use_poll = False, map = None, count = None):
    if map is None:
        map = socket_map

    if use_poll and hasattr(select, 'poll'):
        poll_fun = poll2
    else:
        poll_fun = poll
    if count is None:
        while map:
            poll_fun(timeout, map)
    else:
        while map and count > 0:
            poll_fun(timeout, map)
            count = count - 1


class dispatcher:
    debug = False
    connected = False
    accepting = False
    closing = False
    addr = None

    def __init__(self, sock = None, map = None):
        if map is None:
            self._map = socket_map
        else:
            self._map = map
        if sock:
            self.set_socket(sock, map)
            self.socket.setblocking(0)
            self.connected = True

            try:
                self.addr = sock.getpeername()
            except socket.error:
                pass
            except:
                None<EXCEPTION MATCH>socket.error


        None<EXCEPTION MATCH>socket.error
        self.socket = None


    def __repr__(self):
        status = [
            self.__class__.__module__ + '.' + self.__class__.__name__]
        if self.accepting and self.addr:
            status.append('listening')
        elif self.connected:
            status.append('connected')

        if self.addr is not None:

            try:
                status.append('%s:%d' % self.addr)
            except TypeError:
                status.append(repr(self.addr))
            except:
                None<EXCEPTION MATCH>TypeError


        None<EXCEPTION MATCH>TypeError
        return '<%s at %#x>' % (' '.join(status), id(self))


    def add_channel(self, map = None):
        if map is None:
            map = self._map

        map[self._fileno] = self


    def del_channel(self, map = None):
        fd = self._fileno
        if map is None:
            map = self._map

        if map.has_key(fd):
            del map[fd]

        self._fileno = None


    def create_socket(self, family, type):
        self.family_and_type = (family, type)
        self.socket = socket.socket(family, type)
        self.socket.setblocking(0)
        self._fileno = self.socket.fileno()
        self.add_channel()


    def set_socket(self, sock, map = None):
        self.socket = sock
        self._fileno = sock.fileno()
        self.add_channel(map)


    def set_reuse_addr(self):

        try:
            self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) | 1)
        except socket.error:
            pass



    def readable(self):
        return True


    def writable(self):
        return True


    def listen(self, num):
        self.accepting = True
        if os.name == 'nt' and num > 5:
            num = 1

        return self.socket.listen(num)


    def bind(self, addr):
        self.addr = addr
        return self.socket.bind(addr)


    def connect(self, address):
        self.connected = False
        err = self.socket.connect_ex(address)
        if err in (EINPROGRESS, EALREADY, EWOULDBLOCK):
            return None

        if err in (0, EISCONN):
            self.addr = address
            self.connected = True
            self.handle_connect()
        else:
            raise socket.error, (err, errorcode[err])


    def accept(self):

        try:
            (conn, addr) = self.socket.accept()
            return (conn, addr)
        except socket.error:
            why = None
            if why[0] == EWOULDBLOCK:
                pass
            else:
                raise
        except:
            why[0] == EWOULDBLOCK



    def send(self, data):

        try:
            result = self.socket.send(data)
            return result
        except socket.error:
            why = None
            if why[0] == EWOULDBLOCK:
                return 0
            else:
                raise
            return 0



    def recv(self, buffer_size):

        try:
            data = self.socket.recv(buffer_size)
            if not data:
                self.handle_close()
                return ''
            else:
                return data
        except socket.error:
            why = None
            if why[0] in [
                ECONNRESET,
                ENOTCONN,
                ESHUTDOWN]:
                self.handle_close()
                return ''
            else:
                raise
        except:
            why[0] in [
                ECONNRESET,
                ENOTCONN,
                ESHUTDOWN]



    def close(self):
        self.del_channel()
        self.socket.close()


    def __getattr__(self, attr):
        return getattr(self.socket, attr)


    def log(self, message):
        sys.stderr.write('log: %s\n' % str(message))


    def log_info(self, message, type = 'info'):
        if __debug__ or type != 'info':
            print '%s: %s' % (type, message)



    def handle_read_event(self):
        if self.accepting:
            if not self.connected:
                self.connected = True

            self.handle_accept()
        elif not self.connected:
            self.handle_connect()
            self.connected = True
            self.handle_read()
        else:
            self.handle_read()


    def handle_write_event(self):
        if not self.connected:
            self.handle_connect()
            self.connected = True

        self.handle_write()


    def handle_expt_event(self):
        self.handle_expt()


    def handle_error(self):
        (nil, t, v, tbinfo) = compact_traceback()

        try:
            self_repr = repr(self)
        except:
            self_repr = '<__repr__(self) failed for object at %0x>' % id(self)

        self.log_info('uncaptured python exception, closing channel %s (%s:%s %s)' % (self_repr, t, v, tbinfo), 'error')
        self.close()


    def handle_expt(self):
        self.log_info('unhandled exception', 'warning')


    def handle_read(self):
        self.log_info('unhandled read event', 'warning')


    def handle_write(self):
        self.log_info('unhandled write event', 'warning')


    def handle_connect(self):
        self.log_info('unhandled connect event', 'warning')


    def handle_accept(self):
        self.log_info('unhandled accept event', 'warning')


    def handle_close(self):
        self.log_info('unhandled close event', 'warning')
        self.close()



class dispatcher_with_send(dispatcher):

    def __init__(self, sock = None, map = None):
        dispatcher.__init__(self, sock, map)
        self.out_buffer = ''


    def initiate_send(self):
        num_sent = 0
        num_sent = dispatcher.send(self, self.out_buffer[:512])
        self.out_buffer = self.out_buffer[num_sent:]


    def handle_write(self):
        self.initiate_send()


    def writable(self):
        if not not (self.connected):
            pass
        return len(self.out_buffer)


    def send(self, data):
        if self.debug:
            self.log_info('sending %s' % repr(data))

        self.out_buffer = self.out_buffer + data
        self.initiate_send()



def compact_traceback():
    (t, v, tb) = sys.exc_info()
    tbinfo = []
    if not tb:
        raise AssertionError
    while tb:
        tbinfo.append((tb.tb_frame.f_code.co_filename, tb.tb_frame.f_code.co_name, str(tb.tb_lineno)))
        tb = tb.tb_next
    del tb
    (file, function, line) = tbinfo[-1]
    info = []([ '[%s|%s|%s]' % x for x in tbinfo ])
    return ((file, function, line), t, v, info)


def close_all(map = None):
    if map is None:
        map = socket_map

    for x in map.values():
        x.socket.close()

    map.clear()

if os.name == 'posix':
    import fcntl

    class file_wrapper:

        def __init__(self, fd):
            self.fd = fd


        def recv(self, *args):
            return os.read(self.fd, *args)


        def send(self, *args):
            return os.write(self.fd, *args)

        read = recv
        write = send

        def close(self):
            os.close(self.fd)


        def fileno(self):
            return self.fd



    class file_dispatcher(dispatcher):

        def __init__(self, fd, map = None):
            dispatcher.__init__(self, None, map)
            self.connected = True
            self.set_file(fd)
            flags = fcntl.fcntl(fd, fcntl.F_GETFL, 0)
            flags = flags | os.O_NONBLOCK
            fcntl.fcntl(fd, fcntl.F_SETFL, flags)


        def set_file(self, fd):
            self._fileno = fd
            self.socket = file_wrapper(fd)
            self.add_channel()