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#       Id: asynchat.py,v 2.26 2000/09/07 22:29:26 rushing Exp
#       Author: Sam Rushing &lt;rushing@nightmare.com&gt;

# ======================================================================
# 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&quot;&quot;&quot;A class supporting chat-style (command/response) protocols.

This class adds support for &#039;chat&#039; style protocols - where one side
sends a &#039;command&#039;, 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
&#039;terminator&#039; (usually &#039;\r\n&#039; for single-line responses, &#039;\r\n.\r\n&#039;
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&#039;ll have self.terminator set to &#039;\r\n&#039;, in
order to process the single-line greeting.  Just before issuing a
&#039;LIST&#039; command you&#039;ll set it to &#039;\r\n.\r\n&#039;.  The output of the LIST
command will be accumulated (using your own &#039;collect_incoming_data&#039;
method) up to the terminator, and then control will be returned to
you - by calling your self.found_terminator() method.
&quot;&quot;&quot;

import asyncore
import errno
import socket
from collections import deque
from sys import py3kwarning
from warnings import filterwarnings, catch_warnings

_BLOCKING_IO_ERRORS = (errno.EAGAIN, errno.EALREADY, errno.EINPROGRESS,
                       errno.EWOULDBLOCK)


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

    # these are overridable defaults

    ac_in_buffer_size       = 4096
    ac_out_buffer_size      = 4096

    def __init__ (self, sock=None, map=None):
        # for string terminator matching
        self.ac_in_buffer = &#039;&#039;

        # we use a list here rather than cStringIO for a few reasons...
        # del lst[:] is faster than sio.truncate(0)
        # lst = [] is faster than sio.truncate(0)
        # cStringIO will be gaining unicode support in py3k, which
        # will negatively affect the performance of bytes compared to
        # a &#039;&#039;.join() equivalent
        self.incoming = []

        # we toss the use of the &quot;simple producer&quot; 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(&quot;must be implemented in subclass&quot;)

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

    def _get_data(self):
        d = &#039;&#039;.join(self.incoming)
        del self.incoming[:]
        return d

    def found_terminator(self):
        raise NotImplementedError(&quot;must be implemented in subclass&quot;)

    def set_terminator (self, term):
        &quot;Set the input delimiter.  Can be a fixed string of any length, an integer, or None&quot;
        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 socket.error, why:
            if why.args[0] in _BLOCKING_IO_ERRORS:
                return
            self.handle_error()
            return

        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 = &#039;&#039;
            elif isinstance(terminator, (int, long)):
                # numeric terminator
                n = terminator
                if lb &lt; n:
                    self.collect_incoming_data (self.ac_in_buffer)
                    self.ac_in_buffer = &#039;&#039;
                    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 &gt; 0:
                        # don&#039;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 = &#039;&#039;

    def handle_write (self):
        self.initiate_send()

    def handle_close (self):
        self.close()

    def push (self, data):
        sabs = self.ac_out_buffer_size
        if len(data) &gt; sabs:
            for i in xrange(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):
        &quot;predicate for inclusion in the readable for select()&quot;
        # cannot use the old predicate, it violates the claim of the
        # set_terminator method.

        # return (len(self.ac_in_buffer) &lt;= self.ac_in_buffer_size)
        return 1

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

    def close_when_done (self):
        &quot;automatically close this channel once the outgoing queue is empty&quot;
        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:
                with catch_warnings():
                    if py3kwarning:
                        filterwarnings(&quot;ignore&quot;, &quot;.*buffer&quot;, DeprecationWarning)
                    data = buffer(first, 0, obs)
            except TypeError:
                data = first.more()
                if data:
                    self.producer_fifo.appendleft(data)
                else:
                    del self.producer_fifo[0]
                continue

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

            if num_sent:
                if num_sent &lt; len(data) or obs &lt; 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 = &#039;&#039;
        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) &gt; self.buffer_size:
            result = self.data[:self.buffer_size]
            self.data = self.data[self.buffer_size:]
            return result
        else:
            result = self.data
            self.data = &#039;&#039;
            return result

class fifo:
    def __init__ (self, list=None):
        if not list:
            self.list = deque()
        else:
            self.list = deque(list)

    def __len__ (self):
        return len(self.list)

    def is_empty (self):
        return not self.list

    def first (self):
        return self.list[0]

    def push (self, data):
        self.list.append(data)

    def pop (self):
        if self.list:
            return (1, self.list.popleft())
        else:
            return (0, None)

# Given &#039;haystack&#039;, see if any prefix of &#039;needle&#039; 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 (&quot;qwerty\r&quot;, &quot;\r\n&quot;) =&gt; 1
# f_p_a_e (&quot;qwertydkjf&quot;, &quot;\r\n&quot;) =&gt; 0
# f_p_a_e (&quot;qwerty\r\n&quot;, &quot;\r\n&quot;) =&gt; &lt;undefined&gt;

# 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
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