194 lines
6.3 KiB
Python
194 lines
6.3 KiB
Python
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"""Extension to execute a script in a separate process
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David Scherer <dscherer@cmu.edu>
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The ExecBinding module, a replacement for ScriptBinding, executes
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programs in a separate process. Unlike previous versions, this version
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communicates with the user process via an RPC protocol (see the 'protocol'
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module). The user program is loaded by the 'loader' and 'Remote'
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modules. Its standard output and input are directed back to the
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ExecBinding class through the RPC mechanism and implemented here.
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A "stop program" command is provided and bound to control-break. Closing
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the output window also stops the running program.
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"""
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import sys
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import os
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import imp
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import OutputWindow
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import protocol
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import spawn
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import traceback
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import tempfile
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# Find Python and the loader. This should be done as early in execution
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# as possible, because if the current directory or sys.path is changed
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# it may no longer be possible to get correct paths for these things.
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pyth_exe = spawn.hardpath( sys.executable )
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load_py = spawn.hardpath( imp.find_module("loader")[1] )
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# The following mechanism matches loaders up with ExecBindings that are
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# trying to load something.
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waiting_for_loader = []
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def loader_connect(client, addr):
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if waiting_for_loader:
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a = waiting_for_loader.pop(0)
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try:
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return a.connect(client, addr)
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except:
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return loader_connect(client,addr)
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protocol.publish('ExecBinding', loader_connect)
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class ExecBinding:
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menudefs = [
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('run', [None,
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('Run program', '<<run-complete-script>>'),
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('Stop program', '<<stop-execution>>'),
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]
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),
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]
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delegate = 1
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def __init__(self, editwin):
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self.editwin = editwin
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self.client = None
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self.temp = []
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if not hasattr(editwin, 'source_window'):
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self.delegate = 0
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self.output = OutputWindow.OnDemandOutputWindow(editwin.flist)
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self.output.close_hook = self.stopProgram
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self.output.source_window = editwin
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else:
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if (self.editwin.source_window and
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self.editwin.source_window.extensions.has_key('ExecBinding') and
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not self.editwin.source_window.extensions['ExecBinding'].delegate):
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delegate = self.editwin.source_window.extensions['ExecBinding']
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self.run_complete_script_event = delegate.run_complete_script_event
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self.stop_execution_event = delegate.stop_execution_event
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def __del__(self):
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self.stopProgram()
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def stop_execution_event(self, event):
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if self.client:
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self.stopProgram()
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self.write('\nProgram stopped.\n','stderr')
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def run_complete_script_event(self, event):
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filename = self.getfilename()
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if not filename: return
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filename = os.path.abspath(filename)
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self.stopProgram()
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self.commands = [ ('run', filename) ]
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waiting_for_loader.append(self)
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spawn.spawn( pyth_exe, load_py )
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def connect(self, client, addr):
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# Called by loader_connect() above. It is remotely possible that
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# we get connected to two loaders if the user is running the
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# program repeatedly in a short span of time. In this case, we
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# simply return None, refusing to connect and letting the redundant
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# loader die.
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if self.client: return None
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self.client = client
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client.set_close_hook( self.connect_lost )
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title = self.editwin.short_title()
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if title:
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self.output.set_title(title + " Output")
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else:
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self.output.set_title("Output")
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self.output.write('\n',"stderr")
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self.output.scroll_clear()
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return self
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def connect_lost(self):
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# Called by the client's close hook when the loader closes its
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# socket.
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# We print a disconnect message only if the output window is already
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# open.
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if self.output.owin and self.output.owin.text:
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self.output.owin.interrupt()
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self.output.write("\nProgram disconnected.\n","stderr")
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for t in self.temp:
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try:
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os.remove(t)
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except:
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pass
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self.temp = []
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self.client = None
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def get_command(self):
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# Called by Remote to find out what it should be executing.
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# Later this will be used to implement debugging, interactivity, etc.
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if self.commands:
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return self.commands.pop(0)
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return ('finish',)
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def program_exception(self, type, value, tb, first, last):
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if type == SystemExit: return 0
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for i in range(len(tb)):
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filename, lineno, name, line = tb[i]
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if filename in self.temp:
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filename = 'Untitled'
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tb[i] = filename, lineno, name, line
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list = traceback.format_list(tb[first:last])
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exc = traceback.format_exception_only( type, value )
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self.write('Traceback (innermost last)\n', 'stderr')
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for i in (list+exc):
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self.write(i, 'stderr')
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self.commands = []
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return 1
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def write(self, text, tag):
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self.output.write(text,tag)
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def readline(self):
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return self.output.readline()
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def stopProgram(self):
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if self.client:
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self.client.close()
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self.client = None
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def getfilename(self):
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# Save all files which have been named, because they might be modules
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for edit in self.editwin.flist.inversedict.keys():
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if edit.io and edit.io.filename and not edit.get_saved():
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edit.io.save(None)
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# Experimental: execute unnamed buffer
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if not self.editwin.io.filename:
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filename = os.path.normcase(os.path.abspath(tempfile.mktemp()))
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self.temp.append(filename)
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if self.editwin.io.writefile(filename):
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return filename
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# If the file isn't save, we save it. If it doesn't have a filename,
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# the user will be prompted.
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if self.editwin.io and not self.editwin.get_saved():
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self.editwin.io.save(None)
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# If the file *still* isn't saved, we give up.
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if not self.editwin.get_saved():
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return
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return self.editwin.io.filename
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