543 lines
18 KiB
Python
543 lines
18 KiB
Python
""" idlelib.run
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Simplified, pyshell.ModifiedInterpreter spawns a subprocess with
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f'''{sys.executable} -c "__import__('idlelib.run').run.main()"'''
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'.run' is needed because __import__ returns idlelib, not idlelib.run.
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"""
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import io
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import linecache
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import queue
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import sys
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import time
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import traceback
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import _thread as thread
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import threading
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import warnings
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from idlelib import autocomplete # AutoComplete, fetch_encodings
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from idlelib import calltip # Calltip
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from idlelib import debugger_r # start_debugger
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from idlelib import debugobj_r # remote_object_tree_item
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from idlelib import iomenu # encoding
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from idlelib import rpc # multiple objects
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from idlelib import stackviewer # StackTreeItem
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import __main__
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import tkinter # Use tcl and, if startup fails, messagebox.
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if not hasattr(sys.modules['idlelib.run'], 'firstrun'):
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# Undo modifications of tkinter by idlelib imports; see bpo-25507.
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for mod in ('simpledialog', 'messagebox', 'font',
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'dialog', 'filedialog', 'commondialog',
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'ttk'):
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delattr(tkinter, mod)
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del sys.modules['tkinter.' + mod]
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# Avoid AttributeError if run again; see bpo-37038.
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sys.modules['idlelib.run'].firstrun = False
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LOCALHOST = '127.0.0.1'
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def idle_formatwarning(message, category, filename, lineno, line=None):
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"""Format warnings the IDLE way."""
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s = "\nWarning (from warnings module):\n"
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s += ' File \"%s\", line %s\n' % (filename, lineno)
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if line is None:
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line = linecache.getline(filename, lineno)
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line = line.strip()
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if line:
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s += " %s\n" % line
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s += "%s: %s\n" % (category.__name__, message)
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return s
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def idle_showwarning_subproc(
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message, category, filename, lineno, file=None, line=None):
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"""Show Idle-format warning after replacing warnings.showwarning.
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The only difference is the formatter called.
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"""
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if file is None:
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file = sys.stderr
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try:
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file.write(idle_formatwarning(
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message, category, filename, lineno, line))
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except OSError:
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pass # the file (probably stderr) is invalid - this warning gets lost.
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_warnings_showwarning = None
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def capture_warnings(capture):
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"Replace warning.showwarning with idle_showwarning_subproc, or reverse."
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global _warnings_showwarning
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if capture:
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if _warnings_showwarning is None:
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_warnings_showwarning = warnings.showwarning
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warnings.showwarning = idle_showwarning_subproc
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else:
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if _warnings_showwarning is not None:
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warnings.showwarning = _warnings_showwarning
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_warnings_showwarning = None
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capture_warnings(True)
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tcl = tkinter.Tcl()
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def handle_tk_events(tcl=tcl):
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"""Process any tk events that are ready to be dispatched if tkinter
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has been imported, a tcl interpreter has been created and tk has been
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loaded."""
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tcl.eval("update")
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# Thread shared globals: Establish a queue between a subthread (which handles
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# the socket) and the main thread (which runs user code), plus global
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# completion, exit and interruptable (the main thread) flags:
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exit_now = False
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quitting = False
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interruptable = False
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def main(del_exitfunc=False):
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"""Start the Python execution server in a subprocess
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In the Python subprocess, RPCServer is instantiated with handlerclass
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MyHandler, which inherits register/unregister methods from RPCHandler via
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the mix-in class SocketIO.
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When the RPCServer 'server' is instantiated, the TCPServer initialization
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creates an instance of run.MyHandler and calls its handle() method.
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handle() instantiates a run.Executive object, passing it a reference to the
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MyHandler object. That reference is saved as attribute rpchandler of the
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Executive instance. The Executive methods have access to the reference and
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can pass it on to entities that they command
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(e.g. debugger_r.Debugger.start_debugger()). The latter, in turn, can
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call MyHandler(SocketIO) register/unregister methods via the reference to
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register and unregister themselves.
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"""
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global exit_now
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global quitting
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global no_exitfunc
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no_exitfunc = del_exitfunc
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#time.sleep(15) # test subprocess not responding
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try:
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assert(len(sys.argv) > 1)
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port = int(sys.argv[-1])
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except:
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print("IDLE Subprocess: no IP port passed in sys.argv.",
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file=sys.__stderr__)
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return
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capture_warnings(True)
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sys.argv[:] = [""]
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sockthread = threading.Thread(target=manage_socket,
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name='SockThread',
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args=((LOCALHOST, port),))
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sockthread.daemon = True
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sockthread.start()
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while 1:
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try:
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if exit_now:
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try:
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exit()
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except KeyboardInterrupt:
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# exiting but got an extra KBI? Try again!
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continue
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try:
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request = rpc.request_queue.get(block=True, timeout=0.05)
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except queue.Empty:
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request = None
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# Issue 32207: calling handle_tk_events here adds spurious
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# queue.Empty traceback to event handling exceptions.
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if request:
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seq, (method, args, kwargs) = request
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ret = method(*args, **kwargs)
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rpc.response_queue.put((seq, ret))
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else:
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handle_tk_events()
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except KeyboardInterrupt:
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if quitting:
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exit_now = True
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continue
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except SystemExit:
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capture_warnings(False)
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raise
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except:
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type, value, tb = sys.exc_info()
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try:
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print_exception()
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rpc.response_queue.put((seq, None))
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except:
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# Link didn't work, print same exception to __stderr__
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traceback.print_exception(type, value, tb, file=sys.__stderr__)
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exit()
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else:
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continue
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def manage_socket(address):
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for i in range(3):
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time.sleep(i)
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try:
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server = MyRPCServer(address, MyHandler)
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break
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except OSError as err:
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print("IDLE Subprocess: OSError: " + err.args[1] +
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", retrying....", file=sys.__stderr__)
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socket_error = err
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else:
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print("IDLE Subprocess: Connection to "
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"IDLE GUI failed, exiting.", file=sys.__stderr__)
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show_socket_error(socket_error, address)
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global exit_now
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exit_now = True
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return
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server.handle_request() # A single request only
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def show_socket_error(err, address):
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"Display socket error from manage_socket."
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import tkinter
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from tkinter.messagebox import showerror
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root = tkinter.Tk()
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fix_scaling(root)
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root.withdraw()
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showerror(
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"Subprocess Connection Error",
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f"IDLE's subprocess can't connect to {address[0]}:{address[1]}.\n"
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f"Fatal OSError #{err.errno}: {err.strerror}.\n"
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"See the 'Startup failure' section of the IDLE doc, online at\n"
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"https://docs.python.org/3/library/idle.html#startup-failure",
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parent=root)
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root.destroy()
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def print_exception():
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import linecache
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linecache.checkcache()
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flush_stdout()
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efile = sys.stderr
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typ, val, tb = excinfo = sys.exc_info()
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sys.last_type, sys.last_value, sys.last_traceback = excinfo
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seen = set()
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def print_exc(typ, exc, tb):
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seen.add(id(exc))
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context = exc.__context__
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cause = exc.__cause__
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if cause is not None and id(cause) not in seen:
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print_exc(type(cause), cause, cause.__traceback__)
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print("\nThe above exception was the direct cause "
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"of the following exception:\n", file=efile)
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elif (context is not None and
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not exc.__suppress_context__ and
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id(context) not in seen):
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print_exc(type(context), context, context.__traceback__)
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print("\nDuring handling of the above exception, "
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"another exception occurred:\n", file=efile)
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if tb:
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tbe = traceback.extract_tb(tb)
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print('Traceback (most recent call last):', file=efile)
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exclude = ("run.py", "rpc.py", "threading.py", "queue.py",
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"debugger_r.py", "bdb.py")
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cleanup_traceback(tbe, exclude)
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traceback.print_list(tbe, file=efile)
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lines = traceback.format_exception_only(typ, exc)
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for line in lines:
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print(line, end='', file=efile)
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print_exc(typ, val, tb)
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def cleanup_traceback(tb, exclude):
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"Remove excluded traces from beginning/end of tb; get cached lines"
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orig_tb = tb[:]
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while tb:
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for rpcfile in exclude:
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if tb[0][0].count(rpcfile):
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break # found an exclude, break for: and delete tb[0]
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else:
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break # no excludes, have left RPC code, break while:
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del tb[0]
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while tb:
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for rpcfile in exclude:
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if tb[-1][0].count(rpcfile):
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break
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else:
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break
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del tb[-1]
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if len(tb) == 0:
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# exception was in IDLE internals, don't prune!
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tb[:] = orig_tb[:]
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print("** IDLE Internal Exception: ", file=sys.stderr)
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rpchandler = rpc.objecttable['exec'].rpchandler
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for i in range(len(tb)):
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fn, ln, nm, line = tb[i]
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if nm == '?':
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nm = "-toplevel-"
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if not line and fn.startswith("<pyshell#"):
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line = rpchandler.remotecall('linecache', 'getline',
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(fn, ln), {})
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tb[i] = fn, ln, nm, line
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def flush_stdout():
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"""XXX How to do this now?"""
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def exit():
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"""Exit subprocess, possibly after first clearing exit functions.
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If config-main.cfg/.def 'General' 'delete-exitfunc' is True, then any
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functions registered with atexit will be removed before exiting.
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(VPython support)
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"""
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if no_exitfunc:
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import atexit
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atexit._clear()
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capture_warnings(False)
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sys.exit(0)
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def fix_scaling(root):
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"""Scale fonts on HiDPI displays."""
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import tkinter.font
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scaling = float(root.tk.call('tk', 'scaling'))
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if scaling > 1.4:
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for name in tkinter.font.names(root):
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font = tkinter.font.Font(root=root, name=name, exists=True)
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size = int(font['size'])
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if size < 0:
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font['size'] = round(-0.75*size)
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class MyRPCServer(rpc.RPCServer):
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def handle_error(self, request, client_address):
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"""Override RPCServer method for IDLE
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Interrupt the MainThread and exit server if link is dropped.
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"""
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global quitting
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try:
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raise
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except SystemExit:
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raise
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except EOFError:
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global exit_now
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exit_now = True
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thread.interrupt_main()
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except:
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erf = sys.__stderr__
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print('\n' + '-'*40, file=erf)
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print('Unhandled server exception!', file=erf)
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print('Thread: %s' % threading.current_thread().name, file=erf)
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print('Client Address: ', client_address, file=erf)
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print('Request: ', repr(request), file=erf)
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traceback.print_exc(file=erf)
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print('\n*** Unrecoverable, server exiting!', file=erf)
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print('-'*40, file=erf)
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quitting = True
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thread.interrupt_main()
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# Pseudofiles for shell-remote communication (also used in pyshell)
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class PseudoFile(io.TextIOBase):
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def __init__(self, shell, tags, encoding=None):
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self.shell = shell
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self.tags = tags
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self._encoding = encoding
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@property
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def encoding(self):
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return self._encoding
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@property
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def name(self):
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return '<%s>' % self.tags
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def isatty(self):
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return True
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class PseudoOutputFile(PseudoFile):
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def writable(self):
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return True
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def write(self, s):
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if self.closed:
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raise ValueError("write to closed file")
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if type(s) is not str:
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if not isinstance(s, str):
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raise TypeError('must be str, not ' + type(s).__name__)
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# See issue #19481
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s = str.__str__(s)
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return self.shell.write(s, self.tags)
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class PseudoInputFile(PseudoFile):
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def __init__(self, shell, tags, encoding=None):
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PseudoFile.__init__(self, shell, tags, encoding)
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self._line_buffer = ''
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def readable(self):
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return True
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def read(self, size=-1):
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if self.closed:
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raise ValueError("read from closed file")
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if size is None:
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size = -1
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elif not isinstance(size, int):
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raise TypeError('must be int, not ' + type(size).__name__)
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result = self._line_buffer
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self._line_buffer = ''
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if size < 0:
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while True:
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line = self.shell.readline()
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if not line: break
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result += line
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else:
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while len(result) < size:
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line = self.shell.readline()
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if not line: break
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result += line
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self._line_buffer = result[size:]
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result = result[:size]
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return result
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def readline(self, size=-1):
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if self.closed:
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raise ValueError("read from closed file")
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if size is None:
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size = -1
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elif not isinstance(size, int):
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raise TypeError('must be int, not ' + type(size).__name__)
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line = self._line_buffer or self.shell.readline()
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if size < 0:
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size = len(line)
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eol = line.find('\n', 0, size)
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if eol >= 0:
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size = eol + 1
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self._line_buffer = line[size:]
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return line[:size]
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def close(self):
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self.shell.close()
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class MyHandler(rpc.RPCHandler):
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def handle(self):
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"""Override base method"""
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executive = Executive(self)
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self.register("exec", executive)
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self.console = self.get_remote_proxy("console")
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sys.stdin = PseudoInputFile(self.console, "stdin",
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iomenu.encoding)
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sys.stdout = PseudoOutputFile(self.console, "stdout",
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iomenu.encoding)
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sys.stderr = PseudoOutputFile(self.console, "stderr",
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iomenu.encoding)
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sys.displayhook = rpc.displayhook
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# page help() text to shell.
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import pydoc # import must be done here to capture i/o binding
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pydoc.pager = pydoc.plainpager
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# Keep a reference to stdin so that it won't try to exit IDLE if
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# sys.stdin gets changed from within IDLE's shell. See issue17838.
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self._keep_stdin = sys.stdin
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self.interp = self.get_remote_proxy("interp")
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rpc.RPCHandler.getresponse(self, myseq=None, wait=0.05)
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def exithook(self):
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"override SocketIO method - wait for MainThread to shut us down"
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time.sleep(10)
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def EOFhook(self):
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"Override SocketIO method - terminate wait on callback and exit thread"
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global quitting
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quitting = True
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thread.interrupt_main()
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def decode_interrupthook(self):
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"interrupt awakened thread"
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global quitting
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quitting = True
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thread.interrupt_main()
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class Executive(object):
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def __init__(self, rpchandler):
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self.rpchandler = rpchandler
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self.locals = __main__.__dict__
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self.calltip = calltip.Calltip()
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self.autocomplete = autocomplete.AutoComplete()
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def runcode(self, code):
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global interruptable
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try:
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self.usr_exc_info = None
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interruptable = True
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try:
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exec(code, self.locals)
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finally:
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interruptable = False
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except SystemExit as e:
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if e.args: # SystemExit called with an argument.
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ob = e.args[0]
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if not isinstance(ob, (type(None), int)):
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print('SystemExit: ' + str(ob), file=sys.stderr)
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# Return to the interactive prompt.
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except:
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self.usr_exc_info = sys.exc_info()
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if quitting:
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exit()
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print_exception()
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jit = self.rpchandler.console.getvar("<<toggle-jit-stack-viewer>>")
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if jit:
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self.rpchandler.interp.open_remote_stack_viewer()
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else:
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flush_stdout()
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def interrupt_the_server(self):
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if interruptable:
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thread.interrupt_main()
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def start_the_debugger(self, gui_adap_oid):
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return debugger_r.start_debugger(self.rpchandler, gui_adap_oid)
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def stop_the_debugger(self, idb_adap_oid):
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"Unregister the Idb Adapter. Link objects and Idb then subject to GC"
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self.rpchandler.unregister(idb_adap_oid)
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def get_the_calltip(self, name):
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return self.calltip.fetch_tip(name)
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def get_the_completion_list(self, what, mode):
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return self.autocomplete.fetch_completions(what, mode)
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def stackviewer(self, flist_oid=None):
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if self.usr_exc_info:
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typ, val, tb = self.usr_exc_info
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else:
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return None
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flist = None
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if flist_oid is not None:
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flist = self.rpchandler.get_remote_proxy(flist_oid)
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while tb and tb.tb_frame.f_globals["__name__"] in ["rpc", "run"]:
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|
tb = tb.tb_next
|
|
sys.last_type = typ
|
|
sys.last_value = val
|
|
item = stackviewer.StackTreeItem(flist, tb)
|
|
return debugobj_r.remote_object_tree_item(item)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
from unittest import main
|
|
main('idlelib.idle_test.test_run', verbosity=2)
|
|
|
|
capture_warnings(False) # Make sure turned off; see bpo-18081.
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