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Remote.py

"""
    Support remote access to a Python interpreter.
"""

from guppy.etc import cmd
from guppy import hpy
from guppy.heapy import heapyc, Target
from guppy.heapy.RemoteConstants import *
from guppy.heapy.Console import Console
from guppy.sets import mutbitset

import atexit
import io
import queue
import select
import socket
import sys
import time
import _thread
import threading
import traceback

class SocketClosed(Exception):
    pass

class IsolatedCaller:
    # Isolates the target interpreter from us
    # when the _hiding_tag_ is set to the _hiding_tag_ of our hp.
    # A solution of a problem discussed in notes Nov 8-9 2005.
    # Note feb 3 2006: The class in the Target instance must be used.

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

def __call__(self, *args, **kwds):
        return self.func(*args, **kwds)

class QueueWithReadline(queue.Queue):
    def readline(self, size=-1):
        # Make sure we are interruptible
        # in case we get a keyboard interrupt.
        # Not a very elegant way but the 'only' there is?
        while 1:
            try:
                return self.get(timeout=0.5)
            except queue.Empty:
                continue

class InterruptableSocket:
    def __init__(self, backing):
        self._backing = backing
        self.fileno = self._backing.fileno
        self.close = self._backing.close
        self.readable = self._backing.readable
        self.writable = self._backing.writable
        self.seekable = self._backing.seekable

@property
    def closed(self):
        return self._backing.closed

def read(self, size=-1):
        while not select.select([self], [], [], 0.5)[0]:
            pass

return self._backing.read(size)

class NotiInput:
    def __init__(self, input, output):
        self.input = input
        self.output = output

def read(self, size=-1):
        # This may return less data than what was requested
        return self.readline(size)

def readline(self, size=-1):
        self.output.write(READLINE)
        return self.input.readline(size)

class Annex(cmd.Cmd):
    address_family = socket.AF_INET
    socket_type = socket.SOCK_STREAM
    use_rawinput = 0
    prompt = '<Annex> '

def __init__(self, target, port=None):
        cmd.Cmd.__init__(self)
        if port is None:
            port = HEAPYPORT
        self.server_address = (LOCALHOST, port)
        self.target = target
        target.close = target.sys.modules['guppy.heapy.Remote'].IsolatedCaller(
        # target.close = IsolatedCaller(
            self.asynch_close)
        self.socket = None
        self.isclosed = 0
        self.closelock = _thread.allocate_lock()

self.intlocals = {
        }
        self.do_reset('')

def asynch_close(self):
        # This may be called asynchronously
        # by some other thread than the current (annex) thread.
        # So I need to protect for a possible race condition.
        # It is NOT enough with just an atomic test-and-set here
        # since we need to wait during the time a close initiated
        # from another thread is in progress, before exiting.

self.closelock.acquire()

try:
            if not self.isclosed:
                self.isclosed = 1
                self.disconnect()
        finally:
            self.closelock.release()

while hasattr(self, 'th') and self.th.is_alive():
            time.sleep(0.5)

def connect(self):
        self.socket = socket.socket(self.address_family,
                                    self.socket_type)
        while not self.isclosed:
            try:
                self.socket.connect(self.server_address)
            except SystemExit:
                raise
            except socket.error:
                if self.isclosed:
                    raise
                time.sleep(2)
            else:
                break
        else:
            return

self.stdout = io.TextIOWrapper(
            self.socket.makefile('wb', buffering=0),
            encoding='utf-8', write_through=True)
        self.stdin = NotiInput(io.TextIOWrapper(
            InterruptableSocket(self.socket.makefile('rb', buffering=0)),
            encoding='utf-8', write_through=True), self.stdout)
        self.stderr = sys.stderr

self.start_ki_thread()

cmd.Cmd.__init__(self, stdin=self.stdin, stdout=self.stdout)

def start_ki_thread(self):
        # Start a thread that can generates keyboard interrupr
        # Inserts a spy thread between old stdin and a new stdin

queue = QueueWithReadline()
        ostdin = self.stdin

self.stdin = NotiInput(input=queue,
                               output=ostdin.output)

socket = self.socket

def run():
            try:
                while socket is self.socket:
                    line = ostdin.input.readline()
                    if not line:
                        break
                    if line == KEYBOARDINTERRUPT:
                        if socket is self.socket:
                            heapyc.set_async_exc(self.target.annex_thread,
                                                 KeyboardInterrupt)
                    else:
                        queue.put(line)
            finally:
                if socket is self.socket:
                    heapyc.set_async_exc(self.target.annex_thread,
                                         SocketClosed)

self.th = threading.Thread(target=run,
                                   args=())
        self.th._hiding_tag_ = self.intlocals['hp']._hiding_tag_

self.th.start()

def disconnect(self):
        sock = self.socket
        if sock is None:
            return
        self.socket = None
        try:
            sock.send(DONE)
        except Exception:
            pass
        try:
            sock.shutdown(socket.SHUT_RDWR)
        except Exception:
            pass
        try:
            sock.close()
        except Exception:
            pass
        sys.last_traceback = None

def do_close(self, arg):
        self.asynch_close()
        return 1

def help_close(self):
        print("""close
-----
Close and disable this remote connection completely.  It can then not
be reopened other than by some command from within the target process.

Normally you shouldn't need to use this command, because you can
return to the Monitor via other commands (<Ctrl-C> or .) keeping the
connection open.

But it might be useful when you want to get rid of the remote control
interpreter and thread, if it uses too much memory or disturbs the
target process in some other way.""", file=self.stdout)

do_h = cmd.Cmd.do_help

def help_h(self):
        print("""h(elp)
-----
Without argument, print the list of available commands.
With a command name as argument, print help about that command.""", file=self.stdout)

help_help = help_h

def do_int(self, arg):
        # XXX We should really stop other tasks while we use changed stdio files
        # but that seems to be hard to do
        # so this is ok for some practical purposes.
        # --- new note May 8 2005:
        # --- and doesn't matter since we are in a different interpreter -
        # --- so there is no XXX issue ?
        ostdin = sys.stdin
        ostdout = sys.stdout
        ostderr = sys.stderr

try:
            sys.stdin = self.stdin
            sys.stdout = self.stdout
            sys.stderr = self.stdout

con = Console(stdin=sys.stdin, stdout=sys.stdout,
                          locals=self.intlocals)
            con.interact(
                "Remote interactive console. To return to Annex, type %r." %
                con.EOF_key_sequence)

finally:
            sys.stdin = ostdin
            sys.stdout = ostdout
            sys.stderr = ostderr

def help_int(self):
        print("""int
-----
Interactive console.
Bring up a Python console in the Remote Control interpreter.

This console will initially have access to a heapy constructor, named
hpy, and a ready-made instance, named hp, and the target (see also the
reset command).  Other things may be imported as needed.

After returning to the Annex (by q) or to the Monitor (by . or
<Ctrl-C>), the data in the interactive console will remain there - and
will be available till the next time the console is entered.  But the
data may be cleared and reset to the initial state - a new heapy
instance will be created - by the 'reset' command of Annex.

It should be noted that the interpreter thread under investigation is
executing in parallell with the remote control interpreter. So there
may be some problems to do with that if both are executing at the same
time. This has to be dealt with for each case specifically.""", file=self.stdout)

_bname = 'a1e55f5dc4c9f708311e9f97b8098cd3'

def do_isolatest(self, arg):
        hp = self.intlocals['hp']

a = []
        self._a = a
        b = []
        self.intlocals[self._bname] = b
        # to make __builtins__ exist if it did not already
        eval('0', self.intlocals)

testobjects = [a,
                       b,
                       self.intlocals['__builtins__'],
                       self.intlocals,
                       hp]

h = hp.heap()
        if hp.iso(*testobjects) & h:
            print('Isolation test failed.', file=self.stdout)
            for i, v in enumerate(testobjects):
                if hp.iso(v) & h:
                    print(
                        '-- Shortest Path(s) to testobjects[%d] --' % i, file=self.stdout)
                    print(hp.iso(v).shpaths, file=self.stdout)
        else:
            print('Isolation test succeeded.', file=self.stdout)

del self._a
        del self.intlocals[self._bname]

def help_isolatest(self):
        print("""isolatest
----------
Isolation test.

Test that the target interpreter heap view is isolated from the data
in the remote control interpreter. Data introduced here, eg in the
interactive console, should not be seen in the heap as reported by
hp.heap() etc. This is achieved by setting hp to not follow the
calling interpreter root.  However, this isolation may become broken.
This test is intended to diagnose this problem. The test checks that
none of a number of test objects is visible in the target heap
view. If the test failed, it will show the shortest path(s) to each of
the test objects that was visible.""", file=self.stdout)

def do_q(self, arg):
        print('To return to Monitor, type <Ctrl-C> or .', file=self.stdout)
        print("To close this connection ('permanently'), type close", file=self.stdout)

def help_q(self):
        print("""q
-----
Quit.

This doesn't currently do anything except printing a message.  (I
thought it would be too confusing to have a q (quit) command from the
Annex, when there was a similarly named command in the Monitor.)""", file=self.stdout)

def do_reset(self, arg):
        self.intlocals.clear()
        self.intlocals.update(
            {'hpy': self.hpy,
             'hp': self.hpy(),
             'target': self.target
             })
        # Set shorthand h, it is so commonly used
        # and the instance name now used in README example etc
        self.intlocals['h'] = self.intlocals['hp']

def help_reset(self):
        print("""reset
-----
Reset things to an initial state.

This resets the state of the interactive console data only, for now.
It is reinitialized to contain the following:

hpy     --- from guppy import hpy
hp      --- hp = hpy()
target  --- a reference to some data in the target interpreter
h       --- h = hp; h is a shorthand for hp

(The hpy function is modified here from the normal one so
it sets some options to make it be concerned with the target
interpreter heap under investigation rather than the current one.)
""", file=self.stdout)

def do_stat(self, arg):
        print("Target overview", file=self.stdout)
        print("------------------------------------", file=self.stdout)
        print("target.sys.executable   = %s" %
              self.target.sys.executable, file=self.stdout)
        print("target.sys.argv         = %s" %
              self.target.sys.argv, file=self.stdout)
        print("target.wd               = %s" %
              self.target.wd, file=self.stdout)
        print("target.pid              = %d" %
              self.target.pid, file=self.stdout)
        print("------------------------------------", file=self.stdout)

def help_stat(self):
        print("""stat
-----
Print an overview status table, with data from the target interpreter.

In the table, sys.executable and sys.argv means the current values of
those attributes in the sys module of the target interpreter. The row
labeled target.wd is the working directory of the target interpreter,
at the time the Remote Control interpreter was started (the actual
working directory may have changed since that time). The row labeled
target.pid is the process id of the target interpreter.

""", file=self.stdout)

def hpy(self, *args, **kwds):
        from guppy import hpy
        hp = hpy(*args, **kwds)
        hp.View.is_hiding_calling_interpreter = 1
        hp.View.target = self.target
        self.target._hiding_tag_ = hp._hiding_tag_
        self.target.close._hiding_tag_ = hp._hiding_tag_
        hp.reprefix = 'hp.'
        return hp

def run(self):
        try:
            while not self.isclosed:
                self.connect()
                if not self.isclosed:
                    self.do_stat('')
                    while 1:
                        try:
                            self.cmdloop()
                        except SocketClosed:
                            break
                        except Exception:
                            try:
                                traceback.print_exc(file=self.stdout)
                            except Exception:
                                traceback.print_exc(file=sys.stdout)
                                break
                            continue
                self.disconnect()
        finally:
            # Make sure the thread/interpreter can't terminate
            # without the annex being closed,
            # and that we WAIT if someone else is being closing us.
            self.asynch_close()

def on():
    # Start a remote monitoring enabling thread,
    # unless I am that thread myself.
    global annex_thread, target
    if annex_thread is not None:
        return
    if getattr(sys, '_is_guppy_heapy_remote_interpreter_', 0):
        return
    start_annex = """\
# Set a flag to stop recursion when importing site
# in case sitecustomize tries to do Remote.on()
import sys
sys._is_guppy_heapy_remote_interpreter_ = 1
import site
from guppy.heapy import Remote
Remote.Annex(target).run()
"""
    target = Target.Target()
    annex_thread = heapyc.interpreter(start_annex, {'target': target})
    target.annex_thread = annex_thread

def off():
    global annex_thread, target
    if annex_thread is None:
        return
    for i in range(10):
        try:
            close = target.close
        except AttributeError:
            # It may not have been initiated yet.
            # wait and repeat
            time.sleep(0.05)
        else:
            close()
            break
    else:
        raise

heapyc.set_async_exc(annex_thread, SystemExit)

while True:
        if not hasattr(heapyc.RootState, 't%d_async_exc' % annex_thread):
            break
        else:
            time.sleep(0.05)

annex_thread = target = None

annex_thread = None
target = None

atexit.register(off)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-02-11 06:19:23
..	dir	-	root/root	0755	2026-02-11 06:19:23
__pycache__	dir	-	root/root	0755	2026-02-11 06:19:23
test	dir	-	root/root	0755	2026-02-11 06:19:23
Classifiers.py	text/x-python	45.16 KB	root/root	0644	2026-01-20 01:00:16
Console.py	text/x-python	843 B	root/root	0644	2026-01-20 01:00:16
Doc.py	text/x-python	7.81 KB	root/root	0644	2026-01-20 01:00:16
ImpSet.py	text/x-python	870 B	root/root	0644	2026-01-20 01:00:16
Monitor.py	text/x-python	14.5 KB	root/root	0644	2026-01-20 01:00:16
OutputHandling.py	text/x-python	11.52 KB	root/root	0644	2026-01-20 01:00:16
Part.py	text/x-python	23.25 KB	root/root	0644	2026-01-20 01:00:16
Path.py	text/x-python	14.19 KB	root/root	0644	2026-01-20 01:00:16
Prof.py	text/x-python	90.38 KB	root/root	0644	2026-01-20 01:00:16
RM.py	text/x-python	119 B	root/root	0644	2026-01-20 01:00:16
RefPat.py	text/x-python	18.18 KB	root/root	0644	2026-01-20 01:00:16
Remote.py	text/plain	15.31 KB	root/root	0644	2026-01-20 01:00:16
RemoteConstants.py	text/plain	209 B	root/root	0644	2026-01-20 01:00:16
Spec.py	text/plain	48.59 KB	root/root	0644	2026-01-20 01:00:16
Target.py	text/x-python	205 B	root/root	0644	2026-01-20 01:00:16
UniSet.py	text/x-python	66.5 KB	root/root	0644	2026-01-20 01:00:16
Use.py	text/x-python	23.05 KB	root/root	0644	2026-01-20 01:00:16
View.py	text/x-python	19.05 KB	root/root	0644	2026-01-20 01:00:16
__init__.py	text/x-python	209 B	root/root	0644	2026-01-20 01:00:16
heapyc.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	634.09 KB	root/root	0755	2026-01-20 01:00:16
pbhelp.py	text/plain	17.4 KB	root/root	0644	2026-01-20 01:00:16

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