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__pycache__	[ DIR ]	drwxr-xr-x	2025-04-08 16:49
__init__.py	1.34 KB	-rw-r--r--	2025-04-08 16:49
__main__.py	75 B	-rw-r--r--	2025-04-08 16:49
adjustments.py	17.49 KB	-rw-r--r--	2025-04-08 16:49
buffers.py	9.11 KB	-rw-r--r--	2025-04-08 16:49
channel.py	18.98 KB	-rw-r--r--	2025-04-08 16:49
compat.py	867 B	-rw-r--r--	2025-04-08 16:49
parser.py	15.21 KB	-rw-r--r--	2025-04-08 16:49
proxy_headers.py	12.05 KB	-rw-r--r--	2025-04-08 16:49
receiver.py	5.76 KB	-rw-r--r--	2025-04-08 16:49
rfc7230.py	2.47 KB	-rw-r--r--	2025-04-08 16:49
runner.py	7.44 KB	-rw-r--r--	2025-04-08 16:49
server.py	13.43 KB	-rw-r--r--	2025-04-08 16:49
task.py	21.33 KB	-rw-r--r--	2025-04-08 16:49
trigger.py	7.63 KB	-rw-r--r--	2025-04-08 16:49
utilities.py	6.21 KB	-rw-r--r--	2025-04-08 16:49
wasyncore.py	18.47 KB	-rw-r--r--	2025-04-08 16:49

Rename

# -*- Mode: Python -*-
#   Id: asyncore.py,v 2.51 2000/09/07 22:29:26 rushing Exp
#   Author: Sam Rushing <rushing@nightmare.com>

# ======================================================================
# Copyright 1996 by Sam Rushing
#
#                         All Rights Reserved
#
# Permission to use, copy, modify, and distribute this software and
# its documentation for any purpose and without fee is hereby
# granted, provided that the above copyright notice appear in all
# copies and that both that copyright notice and this permission
# notice appear in supporting documentation, and that the name of Sam
# Rushing not be used in advertising or publicity pertaining to
# distribution of the software without specific, written prior
# permission.
#
# SAM RUSHING DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
# INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
# NO EVENT SHALL SAM RUSHING BE LIABLE FOR ANY SPECIAL, INDIRECT OR
# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
# ======================================================================

"""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.

NB: this is a fork of asyncore from the stdlib that we've (the waitress
developers) named 'wasyncore' to ensure forward compatibility, as asyncore
in the stdlib will be dropped soon.  It is neither a copy of the 2.7 asyncore
nor the 3.X asyncore; it is a version compatible with either 2.7 or 3.X.
"""

from errno import (
    EAGAIN,
    EBADF,
    ECONNABORTED,
    ECONNRESET,
    EINTR,
    ENOTCONN,
    EPIPE,
    ESHUTDOWN,
    EWOULDBLOCK,
)
import logging
import os
import select
import socket
import sys
import time
import warnings

from . import utilities

_DISCONNECTED = frozenset({ECONNRESET, ENOTCONN, ESHUTDOWN, ECONNABORTED, EPIPE, EBADF})

try:
    socket_map
except NameError:
    socket_map = {}

def _strerror(err):
    try:
        return os.strerror(err)
    except (TypeError, ValueError, OverflowError, NameError):
        return "Unknown error %s" % err

class ExitNow(Exception):
    pass

_reraised_exceptions = (ExitNow, KeyboardInterrupt, SystemExit)

def read(obj):
    try:
        obj.handle_read_event()
    except _reraised_exceptions:
        raise
    except:
        obj.handle_error()

def write(obj):
    try:
        obj.handle_write_event()
    except _reraised_exceptions:
        raise
    except:
        obj.handle_error()

def _exception(obj):
    try:
        obj.handle_expt_event()
    except _reraised_exceptions:
        raise
    except:
        obj.handle_error()

def readwrite(obj, flags):
    try:
        if flags & select.POLLIN:
            obj.handle_read_event()
        if flags & select.POLLOUT:
            obj.handle_write_event()
        if flags & select.POLLPRI:
            obj.handle_expt_event()
        if flags & (select.POLLHUP | select.POLLERR | select.POLLNVAL):
            obj.handle_close()
    except OSError as e:
        if e.args[0] not in _DISCONNECTED:
            obj.handle_error()
        else:
            obj.handle_close()
    except _reraised_exceptions:
        raise
    except:
        obj.handle_error()

def poll(timeout=0.0, map=None):
    if map is None:  # pragma: no cover
        map = socket_map
    if map:
        r = []
        w = []
        e = []
        for fd, obj in list(map.items()):  # list() call FBO py3
            is_r = obj.readable()
            is_w = obj.writable()
            if is_r:
                r.append(fd)
            # accepting sockets should not be writable
            if is_w and not obj.accepting:
                w.append(fd)
            if is_r or is_w:
                e.append(fd)
        if [] == r == w == e:
            time.sleep(timeout)
            return

try:
            r, w, e = select.select(r, w, e, timeout)
        except OSError as err:
            if err.args[0] != EINTR:
                raise
            else:
                return

for fd in r:
            obj = map.get(fd)
            if obj is None:  # pragma: no cover
                continue
            read(obj)

for fd in w:
            obj = map.get(fd)
            if obj is None:  # pragma: no cover
                continue
            write(obj)

for fd in e:
            obj = map.get(fd)
            if obj is None:  # pragma: no cover
                continue
            _exception(obj)

def poll2(timeout=0.0, map=None):
    # Use the poll() support added to the select module in Python 2.0
    if map is None:  # pragma: no cover
        map = socket_map
    if timeout is not None:
        # timeout is in milliseconds
        timeout = int(timeout * 1000)
    pollster = select.poll()
    if map:
        for fd, obj in list(map.items()):
            flags = 0
            if obj.readable():
                flags |= select.POLLIN | select.POLLPRI
            # accepting sockets should not be writable
            if obj.writable() and not obj.accepting:
                flags |= select.POLLOUT
            if flags:
                pollster.register(fd, flags)

try:
            r = pollster.poll(timeout)
        except OSError as err:
            if err.args[0] != EINTR:
                raise
            r = []

for fd, flags in r:
            obj = map.get(fd)
            if obj is None:  # pragma: no cover
                continue
            readwrite(obj, flags)

poll3 = poll2  # Alias for backward compatibility

def loop(timeout=30.0, use_poll=False, map=None, count=None):
    if map is None:  # pragma: no cover
        map = socket_map

if use_poll and hasattr(select, "poll"):
        poll_fun = poll2
    else:
        poll_fun = poll

if count is None:  # pragma: no cover
        while map:
            poll_fun(timeout, map)

else:
        while map and count > 0:
            poll_fun(timeout, map)
            count = count - 1

def compact_traceback():
    t, v, tb = sys.exc_info()
    tbinfo = []
    if not tb:  # pragma: no cover
        raise AssertionError("traceback does not exist")
    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

# just to be safe
    del tb

file, function, line = tbinfo[-1]
    info = " ".join(["[%s|%s|%s]" % x for x in tbinfo])
    return (file, function, line), t, v, info

class dispatcher:
    debug = False
    connected = False
    accepting = False
    connecting = False
    closing = False
    addr = None
    ignore_log_types = frozenset({"warning"})
    logger = utilities.logger
    compact_traceback = staticmethod(compact_traceback)  # for testing

def __init__(self, sock=None, map=None):
        if map is None:  # pragma: no cover
            self._map = socket_map
        else:
            self._map = map

self._fileno = None

if sock:
            # Set to nonblocking just to make sure for cases where we
            # get a socket from a blocking source.
            sock.setblocking(0)
            self.set_socket(sock, map)
        else:
            self.socket = None

def __repr__(self):
        status = [self.__class__.__module__ + "." + self.__class__.__qualname__]
        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:  # pragma: no cover
                status.append(repr(self.addr))
        return "<{} at {:#x}>".format(" ".join(status), id(self))

__str__ = __repr__

def add_channel(self, map=None):
        # self.log_info('adding channel %s' % self)
        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 fd in map:
            # self.log_info('closing channel %d:%s' % (fd, self))
            del map[fd]
        self._fileno = None

def create_socket(self, family=socket.AF_INET, type=socket.SOCK_STREAM):
        self.family_and_type = family, type
        sock = socket.socket(family, type)
        sock.setblocking(0)
        self.set_socket(sock)

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

def set_reuse_addr(self):
        # try to re-use a server port if possible
        try:
            self.socket.setsockopt(
                socket.SOL_SOCKET,
                socket.SO_REUSEADDR,
                self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) | 1,
            )
        except OSError:
            pass

# ==================================================
    # predicates for select()
    # these are used as filters for the lists of sockets
    # to pass to select().
    # ==================================================

def readable(self):
        return True

def writable(self):
        return True

# ==================================================
    # socket object methods.
    # ==================================================

def listen(self, num):
        self.accepting = True
        if os.name == "nt" and num > 5:  # pragma: no cover
            num = 5
        return self.socket.listen(num)

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

def accept(self):
        # XXX can return either an address pair or None
        try:
            conn, addr = self.socket.accept()
        except TypeError:
            return None
        except OSError as why:
            if why.args[0] in (EWOULDBLOCK, ECONNABORTED, EAGAIN):
                return None
            else:
                raise
        else:
            return conn, addr

def send(self, data, do_close=True):
        try:
            result = self.socket.send(data)
            return result
        except OSError as why:
            if why.args[0] == EWOULDBLOCK:
                return 0
            elif why.args[0] in _DISCONNECTED:
                if do_close:
                    self.handle_close()
                return 0
            else:
                raise

def recv(self, buffer_size):
        try:
            data = self.socket.recv(buffer_size)
            if not data:
                # a closed connection is indicated by signaling
                # a read condition, and having recv() return 0.
                self.handle_close()
                return b""
            else:
                return data
        except OSError as why:
            # winsock sometimes raises ENOTCONN
            if why.args[0] in _DISCONNECTED:
                self.handle_close()
                return b""
            else:
                raise

def close(self):
        self.connected = False
        self.accepting = False
        self.connecting = False
        self.del_channel()
        if self.socket is not None:
            try:
                self.socket.close()
            except OSError as why:
                if why.args[0] not in (ENOTCONN, EBADF):
                    raise

self.socket = None

# log and log_info may be overridden to provide more sophisticated
    # logging and warning methods. In general, log is for 'hit' logging
    # and 'log_info' is for informational, warning and error logging.

def log(self, message):
        self.logger.log(logging.DEBUG, message)

def log_info(self, message, type="info"):
        severity = {
            "info": logging.INFO,
            "warning": logging.WARN,
            "error": logging.ERROR,
        }
        self.logger.log(severity.get(type, logging.INFO), message)

def handle_read_event(self):
        if self.accepting:
            # accepting sockets are never connected, they "spawn" new
            # sockets that are connected
            self.handle_accept()
        elif not self.connected:
            if self.connecting:
                self.handle_connect_event()
            self.handle_read()
        else:
            self.handle_read()

def handle_connect_event(self):
        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
        if err != 0:
            raise OSError(err, _strerror(err))
        self.handle_connect()
        self.connected = True
        self.connecting = False

def handle_write_event(self):
        if self.accepting:
            # Accepting sockets shouldn't get a write event.
            # We will pretend it didn't happen.
            return

if not self.connected:
            if self.connecting:
                self.handle_connect_event()
        self.handle_write()

def handle_expt_event(self):
        # handle_expt_event() is called if there might be an error on the
        # socket, or if there is OOB data
        # check for the error condition first
        err = (
            self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
            if self.socket is not None
            else 1
        )
        if err != 0:
            # we can get here when select.select() says that there is an
            # exceptional condition on the socket
            # since there is an error, we'll go ahead and close the socket
            # like we would in a subclassed handle_read() that received no
            # data
            self.handle_close()
        else:
            self.handle_expt()

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

# sometimes a user repr method will crash.
        try:
            self_repr = repr(self)
        except:  # pragma: no cover
            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.handle_close()

def handle_expt(self):
        self.log_info("unhandled incoming priority event", "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):
        pair = self.accept()
        if pair is not None:
            self.handle_accepted(*pair)

def handle_accepted(self, sock, addr):
        sock.close()
        self.log_info("unhandled accepted event", "warning")

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

def close_all(map=None, ignore_all=False):
    if map is None:  # pragma: no cover
        map = socket_map
    for x in list(map.values()):  # list() FBO py3
        try:
            x.close()
        except OSError as x:
            if x.args[0] == EBADF:
                pass
            elif not ignore_all:
                raise
        except _reraised_exceptions:
            raise
        except:
            if not ignore_all:
                raise
    map.clear()

# Asynchronous File I/O:
#
# After a little research (reading man pages on various unixen, and
# digging through the linux kernel), I've determined that select()
# isn't meant for doing asynchronous file i/o.
# Heartening, though - reading linux/mm/filemap.c shows that linux
# supports asynchronous read-ahead.  So _MOST_ of the time, the data
# will be sitting in memory for us already when we go to read it.
#
# What other OS's (besides NT) support async file i/o?  [VMS?]
#
# Regardless, this is useful for pipes, and stdin/stdout...

if os.name == "posix":

class file_wrapper:
        # Here we override just enough to make a file
        # look like a socket for the purposes of asyncore.
        # The passed fd is automatically os.dup()'d

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

def __del__(self):
            if self.fd >= 0:
                warnings.warn("unclosed file %r" % self, ResourceWarning)
            self.close()

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

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

def getsockopt(self, level, optname, buflen=None):  # pragma: no cover
            if level == socket.SOL_SOCKET and optname == socket.SO_ERROR and not buflen:
                return 0
            raise NotImplementedError(
                "Only asyncore specific behaviour " "implemented."
            )

read = recv
        write = send

def close(self):
            if self.fd < 0:
                return
            fd = self.fd
            self.fd = -1
            os.close(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
            try:
                fd = fd.fileno()
            except AttributeError:
                pass
            self.set_file(fd)
            # set it to non-blocking mode
            os.set_blocking(fd, False)

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