import sys import os import time import socket import traceback import thread import threading import Queue import CallTips import RemoteDebugger import RemoteObjectBrowser import StackViewer import rpc import __main__ LOCALHOST = '127.0.0.1' # Thread shared globals: Establish a queue between a subthread (which handles # the socket) and the main thread (which runs user code), plus global # completion and exit flags: exit_now = False quitting = False def main(del_exitfunc=False): """Start the Python execution server in a subprocess In the Python subprocess, RPCServer is instantiated with handlerclass MyHandler, which inherits register/unregister methods from RPCHandler via the mix-in class SocketIO. When the RPCServer 'server' is instantiated, the TCPServer initialization creates an instance of run.MyHandler and calls its handle() method. handle() instantiates a run.Executive object, passing it a reference to the MyHandler object. That reference is saved as attribute rpchandler of the Executive instance. The Executive methods have access to the reference and can pass it on to entities that they command (e.g. RemoteDebugger.Debugger.start_debugger()). The latter, in turn, can call MyHandler(SocketIO) register/unregister methods via the reference to register and unregister themselves. """ global exit_now global quitting global no_exitfunc no_exitfunc = del_exitfunc port = 8833 if sys.argv[1:]: port = int(sys.argv[1]) sys.argv[:] = [""] sockthread = threading.Thread(target=manage_socket, name='SockThread', args=((LOCALHOST, port),)) sockthread.setDaemon(True) sockthread.start() while 1: try: if exit_now: try: exit() except KeyboardInterrupt: # exiting but got an extra KBI? Try again! continue try: seq, request = rpc.request_queue.get(0) except Queue.Empty: time.sleep(0.05) continue method, args, kwargs = request ret = method(*args, **kwargs) rpc.response_queue.put((seq, ret)) except KeyboardInterrupt: if quitting: exit_now = True continue except SystemExit: raise except: type, value, tb = sys.exc_info() try: print_exception() rpc.response_queue.put((seq, None)) except: # Link didn't work, print same exception to __stderr__ traceback.print_exception(type, value, tb, file=sys.__stderr__) exit() else: continue def manage_socket(address): for i in range(6): time.sleep(i) try: server = MyRPCServer(address, MyHandler) break except socket.error, err: if i < 3: print>>sys.__stderr__, ".. ", else: print>>sys.__stderr__,"\nPython subprocess socket error: "\ + err[1] + ", retrying...." else: print>>sys.__stderr__, "\nConnection to Idle failed, exiting." global exit_now exit_now = True return server.handle_request() # A single request only def print_exception(): flush_stdout() efile = sys.stderr typ, val, tb = excinfo = sys.exc_info() sys.last_type, sys.last_value, sys.last_traceback = excinfo tbe = traceback.extract_tb(tb) print >>efile, '\nTraceback (most recent call last):' exclude = ("run.py", "rpc.py", "threading.py", "Queue.py", "RemoteDebugger.py", "bdb.py") cleanup_traceback(tbe, exclude) traceback.print_list(tbe, file=efile) lines = traceback.format_exception_only(typ, val) for line in lines: print>>efile, line, def cleanup_traceback(tb, exclude): "Remove excluded traces from beginning/end of tb; get cached lines" orig_tb = tb[:] while tb: for rpcfile in exclude: if tb[0][0].count(rpcfile): break # found an exclude, break for: and delete tb[0] else: break # no excludes, have left RPC code, break while: del tb[0] while tb: for rpcfile in exclude: if tb[-1][0].count(rpcfile): break else: break del tb[-1] if len(tb) == 0: # exception was in IDLE internals, don't prune! tb[:] = orig_tb[:] print>>sys.stderr, "** IDLE Internal Exception: " rpchandler = rpc.objecttable['exec'].rpchandler for i in range(len(tb)): fn, ln, nm, line = tb[i] if nm == '?': nm = "-toplevel-" if not line and fn.startswith(">erf, '\n' + '-'*40 print>>erf, 'Unhandled server exception!' print>>erf, 'Thread: %s' % threading.currentThread().getName() print>>erf, 'Client Address: ', client_address print>>erf, 'Request: ', repr(request) traceback.print_exc(file=erf) print>>erf, '\n*** Unrecoverable, server exiting!' print>>erf, '-'*40 exit() class MyHandler(rpc.RPCHandler): def handle(self): """Override base method""" executive = Executive(self) self.register("exec", executive) sys.stdin = self.console = self.get_remote_proxy("stdin") sys.stdout = self.get_remote_proxy("stdout") sys.stderr = self.get_remote_proxy("stderr") import IOBinding sys.stdin.encoding = sys.stdout.encoding = \ sys.stderr.encoding = IOBinding.encoding self.interp = self.get_remote_proxy("interp") rpc.RPCHandler.getresponse(self, myseq=None, wait=0.05) def exithook(self): "override SocketIO method - wait for MainThread to shut us down" time.sleep(10) def EOFhook(self): "Override SocketIO method - terminate wait on callback and exit thread" global quitting quitting = True thread.interrupt_main() def decode_interrupthook(self): "interrupt awakened thread" global quitting quitting = True thread.interrupt_main() class Executive: def __init__(self, rpchandler): self.rpchandler = rpchandler self.locals = __main__.__dict__ self.calltip = CallTips.CallTips() def runcode(self, code): try: self.usr_exc_info = None exec code in self.locals except: self.usr_exc_info = sys.exc_info() if quitting: exit() # even print a user code SystemExit exception, continue print_exception() jit = self.rpchandler.console.getvar("<>") if jit: self.rpchandler.interp.open_remote_stack_viewer() else: flush_stdout() def interrupt_the_server(self): thread.interrupt_main() def start_the_debugger(self, gui_adap_oid): return RemoteDebugger.start_debugger(self.rpchandler, gui_adap_oid) def stop_the_debugger(self, idb_adap_oid): "Unregister the Idb Adapter. Link objects and Idb then subject to GC" self.rpchandler.unregister(idb_adap_oid) def get_the_calltip(self, name): return self.calltip.fetch_tip(name) def stackviewer(self, flist_oid=None): if self.usr_exc_info: typ, val, tb = self.usr_exc_info else: return None flist = None if flist_oid is not None: flist = self.rpchandler.get_remote_proxy(flist_oid) while tb and tb.tb_frame.f_globals["__name__"] in ["rpc", "run"]: tb = tb.tb_next sys.last_type = typ sys.last_value = val item = StackViewer.StackTreeItem(flist, tb) return RemoteObjectBrowser.remote_object_tree_item(item)