ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: usr / lib64 / python3.6

# -*- Mode: Python; tab-width: 4 -*-
#       Id: asynchat.py,v 2.26 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.
# ======================================================================

r"""A class supporting chat-style (command/response) protocols.

This class adds support for 'chat' style protocols - where one side
sends a 'command', and the other sends a response (examples would be
the common internet protocols - smtp, nntp, ftp, etc..).

The handle_read() method looks at the input stream for the current
'terminator' (usually '\r\n' for single-line responses, '\r\n.\r\n'
for multi-line output), calling self.found_terminator() on its
receipt.

for example:
Say you build an async nntp client using this class.  At the start
of the connection, you'll have self.terminator set to '\r\n', in
order to process the single-line greeting.  Just before issuing a
'LIST' command you'll set it to '\r\n.\r\n'.  The output of the LIST
command will be accumulated (using your own 'collect_incoming_data'
method) up to the terminator, and then control will be returned to
you - by calling your self.found_terminator() method.
"""
import asyncore
from collections import deque

class async_chat(asyncore.dispatcher):
    """This is an abstract class.  You must derive from this class, and add
    the two methods collect_incoming_data() and found_terminator()"""

# these are overridable defaults

ac_in_buffer_size = 65536
    ac_out_buffer_size = 65536

# we don't want to enable the use of encoding by default, because that is a
    # sign of an application bug that we don't want to pass silently

use_encoding = 0
    encoding = 'latin-1'

def __init__(self, sock=None, map=None):
        # for string terminator matching
        self.ac_in_buffer = b''

# we use a list here rather than io.BytesIO for a few reasons...
        # del lst[:] is faster than bio.truncate(0)
        # lst = [] is faster than bio.truncate(0)
        self.incoming = []

# we toss the use of the "simple producer" and replace it with
        # a pure deque, which the original fifo was a wrapping of
        self.producer_fifo = deque()
        asyncore.dispatcher.__init__(self, sock, map)

def collect_incoming_data(self, data):
        raise NotImplementedError("must be implemented in subclass")

def _collect_incoming_data(self, data):
        self.incoming.append(data)

def _get_data(self):
        d = b''.join(self.incoming)
        del self.incoming[:]
        return d

def found_terminator(self):
        raise NotImplementedError("must be implemented in subclass")

def set_terminator(self, term):
        """Set the input delimiter.

Can be a fixed string of any length, an integer, or None.
        """
        if isinstance(term, str) and self.use_encoding:
            term = bytes(term, self.encoding)
        elif isinstance(term, int) and term < 0:
            raise ValueError('the number of received bytes must be positive')
        self.terminator = term

def get_terminator(self):
        return self.terminator

# grab some more data from the socket,
    # throw it to the collector method,
    # check for the terminator,
    # if found, transition to the next state.

def handle_read(self):

try:
            data = self.recv(self.ac_in_buffer_size)
        except BlockingIOError:
            return
        except OSError as why:
            self.handle_error()
            return

if isinstance(data, str) and self.use_encoding:
            data = bytes(str, self.encoding)
        self.ac_in_buffer = self.ac_in_buffer + data

# Continue to search for self.terminator in self.ac_in_buffer,
        # while calling self.collect_incoming_data.  The while loop
        # is necessary because we might read several data+terminator
        # combos with a single recv(4096).

while self.ac_in_buffer:
            lb = len(self.ac_in_buffer)
            terminator = self.get_terminator()
            if not terminator:
                # no terminator, collect it all
                self.collect_incoming_data(self.ac_in_buffer)
                self.ac_in_buffer = b''
            elif isinstance(terminator, int):
                # numeric terminator
                n = terminator
                if lb < n:
                    self.collect_incoming_data(self.ac_in_buffer)
                    self.ac_in_buffer = b''
                    self.terminator = self.terminator - lb
                else:
                    self.collect_incoming_data(self.ac_in_buffer[:n])
                    self.ac_in_buffer = self.ac_in_buffer[n:]
                    self.terminator = 0
                    self.found_terminator()
            else:
                # 3 cases:
                # 1) end of buffer matches terminator exactly:
                #    collect data, transition
                # 2) end of buffer matches some prefix:
                #    collect data to the prefix
                # 3) end of buffer does not match any prefix:
                #    collect data
                terminator_len = len(terminator)
                index = self.ac_in_buffer.find(terminator)
                if index != -1:
                    # we found the terminator
                    if index > 0:
                        # don't bother reporting the empty string
                        # (source of subtle bugs)
                        self.collect_incoming_data(self.ac_in_buffer[:index])
                    self.ac_in_buffer = self.ac_in_buffer[index+terminator_len:]
                    # This does the Right Thing if the terminator
                    # is changed here.
                    self.found_terminator()
                else:
                    # check for a prefix of the terminator
                    index = find_prefix_at_end(self.ac_in_buffer, terminator)
                    if index:
                        if index != lb:
                            # we found a prefix, collect up to the prefix
                            self.collect_incoming_data(self.ac_in_buffer[:-index])
                            self.ac_in_buffer = self.ac_in_buffer[-index:]
                        break
                    else:
                        # no prefix, collect it all
                        self.collect_incoming_data(self.ac_in_buffer)
                        self.ac_in_buffer = b''

def handle_write(self):
        self.initiate_send()

def handle_close(self):
        self.close()

def push(self, data):
        if not isinstance(data, (bytes, bytearray, memoryview)):
            raise TypeError('data argument must be byte-ish (%r)',
                            type(data))
        sabs = self.ac_out_buffer_size
        if len(data) > sabs:
            for i in range(0, len(data), sabs):
                self.producer_fifo.append(data[i:i+sabs])
        else:
            self.producer_fifo.append(data)
        self.initiate_send()

def push_with_producer(self, producer):
        self.producer_fifo.append(producer)
        self.initiate_send()

def readable(self):
        "predicate for inclusion in the readable for select()"
        # cannot use the old predicate, it violates the claim of the
        # set_terminator method.

# return (len(self.ac_in_buffer) <= self.ac_in_buffer_size)
        return 1

def writable(self):
        "predicate for inclusion in the writable for select()"
        return self.producer_fifo or (not self.connected)

def close_when_done(self):
        "automatically close this channel once the outgoing queue is empty"
        self.producer_fifo.append(None)

def initiate_send(self):
        while self.producer_fifo and self.connected:
            first = self.producer_fifo[0]
            # handle empty string/buffer or None entry
            if not first:
                del self.producer_fifo[0]
                if first is None:
                    self.handle_close()
                    return

# handle classic producer behavior
            obs = self.ac_out_buffer_size
            try:
                data = first[:obs]
            except TypeError:
                data = first.more()
                if data:
                    self.producer_fifo.appendleft(data)
                else:
                    del self.producer_fifo[0]
                continue

if isinstance(data, str) and self.use_encoding:
                data = bytes(data, self.encoding)

# send the data
            try:
                num_sent = self.send(data)
            except OSError:
                self.handle_error()
                return

if num_sent:
                if num_sent < len(data) or obs < len(first):
                    self.producer_fifo[0] = first[num_sent:]
                else:
                    del self.producer_fifo[0]
            # we tried to send some actual data
            return

def discard_buffers(self):
        # Emergencies only!
        self.ac_in_buffer = b''
        del self.incoming[:]
        self.producer_fifo.clear()

class simple_producer:

def __init__(self, data, buffer_size=512):
        self.data = data
        self.buffer_size = buffer_size

def more(self):
        if len(self.data) > self.buffer_size:
            result = self.data[:self.buffer_size]
            self.data = self.data[self.buffer_size:]
            return result
        else:
            result = self.data
            self.data = b''
            return result

# Given 'haystack', see if any prefix of 'needle' is at its end.  This
# assumes an exact match has already been checked.  Return the number of
# characters matched.
# for example:
# f_p_a_e("qwerty\r", "\r\n") => 1
# f_p_a_e("qwertydkjf", "\r\n") => 0
# f_p_a_e("qwerty\r\n", "\r\n") => <undefined>

# this could maybe be made faster with a computed regex?
# [answer: no; circa Python-2.0, Jan 2001]
# new python:   28961/s
# old python:   18307/s
# re:        12820/s
# regex:     14035/s

def find_prefix_at_end(haystack, needle):
    l = len(needle) - 1
    while l and not haystack.endswith(needle[:l]):
        l -= 1
    return l

[+] ..
[-] __phello__.foo.py [edit]
[-] zipfile.py [edit]
[-] _dummy_thread.py [edit]
[-] signal.py [edit]
[-] tabnanny.py [edit]
[-] cmd.py [edit]
[-] cProfile.py [edit]
[-] tempfile.py [edit]
[-] argparse.py [edit]
[-] platform.py [edit]
[-] binhex.py [edit]
[-] antigravity.py [edit]
[+] curses
[-] _compat_pickle.py [edit]
[-] statistics.py [edit]
[-] inspect.py [edit]
[-] ipaddress.py [edit]
[-] sunau.py [edit]
[-] imghdr.py [edit]
[-] random.py [edit]
[-] macpath.py [edit]
[-] hmac.py [edit]
[-] base64.py [edit]
[-] cgitb.py [edit]
[-] stringprep.py [edit]
[-] ast.py [edit]
[-] textwrap.py [edit]
[-] enum.py [edit]
[-] _compression.py [edit]
[-] dis.py [edit]
[+] venv
[-] chunk.py [edit]
[-] this.py [edit]
[-] py_compile.py [edit]
[-] fnmatch.py [edit]
[+] xml
[-] opcode.py [edit]
[+] site-packages
[-] sre_compile.py [edit]
[-] _pyio.py [edit]
[-] pty.py [edit]
[-] datetime.py [edit]
[-] macurl2path.py [edit]
[+] lib2to3
[+] wsgiref
[-] heapq.py [edit]
[-] keyword.py [edit]
[-] codecs.py [edit]
[+] ensurepip
[-] pickletools.py [edit]
[-] compileall.py [edit]
[-] nturl2path.py [edit]
[-] warnings.py [edit]
[-] shutil.py [edit]
[-] socket.py [edit]
[-] pdb.py [edit]
[-] zipapp.py [edit]
[-] formatter.py [edit]
[-] _sitebuiltins.py [edit]
[-] _markupbase.py [edit]
[-] types.py [edit]
[-] runpy.py [edit]
[-] uu.py [edit]
[-] typing.py [edit]
[-] pathlib.py [edit]
[-] _threading_local.py [edit]
[-] mailcap.py [edit]
[-] bisect.py [edit]
[-] linecache.py [edit]
[-] colorsys.py [edit]
[-] glob.py [edit]
[-] sndhdr.py [edit]
[-] ssl.py [edit]
[-] _strptime.py [edit]
[-] _sysconfigdata_m_linux_x86_64-linux-gnu.py [edit]
[-] imp.py [edit]
[-] contextlib.py [edit]
[-] copyreg.py [edit]
[-] filecmp.py [edit]
[+] logging
[-] operator.py [edit]
[-] token.py [edit]
[-] gzip.py [edit]
[-] string.py [edit]
[-] genericpath.py [edit]
[-] _osx_support.py [edit]
[-] stat.py [edit]
[-] lzma.py [edit]
[-] __future__.py [edit]
[+] distutils
[-] dummy_threading.py [edit]
[+] asyncio
[-] webbrowser.py [edit]
[-] symtable.py [edit]
[+] lib-dynload
[-] getopt.py [edit]
[-] wave.py [edit]
[-] codeop.py [edit]
[-] _sysconfigdata_dm_linux_x86_64-linux-gnu.py [edit]
[-] abc.py [edit]
[+] config-3.6m-x86_64-linux-gnu
[+] pydoc_data
[-] telnetlib.py [edit]
[+] unittest
[-] fileinput.py [edit]
[-] ftplib.py [edit]
[+] ctypes
[-] _bootlocale.py [edit]
[-] pipes.py [edit]
[-] aifc.py [edit]
[-] pprint.py [edit]
[-] queue.py [edit]
[-] difflib.py [edit]
[+] __pycache__
[-] uuid.py [edit]
[-] reprlib.py [edit]
[-] threading.py [edit]
[+] http
[-] sre_parse.py [edit]
[-] subprocess.py [edit]
[+] importlib
[-] selectors.py [edit]
[-] getpass.py [edit]
[-] trace.py [edit]
[-] struct.py [edit]
[-] tracemalloc.py [edit]
[-] plistlib.py [edit]
[-] asynchat.py [edit]
[-] fractions.py [edit]
[-] shlex.py [edit]
[-] bdb.py [edit]
[-] locale.py [edit]
[-] calendar.py [edit]
[-] poplib.py [edit]
[-] posixpath.py [edit]
[-] imaplib.py [edit]
[+] concurrent
[-] pickle.py [edit]
[-] timeit.py [edit]
[+] json
[-] traceback.py [edit]
[+] multiprocessing
[-] shelve.py [edit]
[-] csv.py [edit]
[-] tarfile.py [edit]
[-] numbers.py [edit]
[-] optparse.py [edit]
[-] cgi.py [edit]
[-] pstats.py [edit]
[-] crypt.py [edit]
[+] collections
[-] site.py [edit]
[-] pkgutil.py [edit]
[-] re.py [edit]
[-] pyclbr.py [edit]
[-] socketserver.py [edit]
[-] _pydecimal.py [edit]
[-] pydoc.py [edit]
[-] sre_constants.py [edit]
[-] xdrlib.py [edit]
[-] nntplib.py [edit]
[-] mimetypes.py [edit]
[+] email
[-] quopri.py [edit]
[-] doctest.py [edit]
[-] profile.py [edit]
[-] sched.py [edit]
[-] hashlib.py [edit]
[+] urllib
[-] secrets.py [edit]
[-] functools.py [edit]
[-] smtplib.py [edit]
[-] copy.py [edit]
[+] dbm
[-] tty.py [edit]
[-] os.py [edit]
[-] _collections_abc.py [edit]
[-] configparser.py [edit]
[-] _weakrefset.py [edit]
[-] netrc.py [edit]
[-] code.py [edit]
[-] asyncore.py [edit]
[-] tokenize.py [edit]
[+] encodings
[-] io.py [edit]
[-] smtpd.py [edit]
[-] sysconfig.py [edit]
[-] decimal.py [edit]
[+] sqlite3
[-] rlcompleter.py [edit]
[-] ntpath.py [edit]
[+] test
[-] weakref.py [edit]
[-] symbol.py [edit]
[-] modulefinder.py [edit]
[+] xmlrpc
[-] bz2.py [edit]
[-] gettext.py [edit]
[-] mailbox.py [edit]
[+] html