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137 lines
3.9 KiB
Python
137 lines
3.9 KiB
Python
"""
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async_io_helper module
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example usage:
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from __future__ import generators
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import async_io_helper
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helper = async_io_helper.new_helper()
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def get_helper():
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return helper
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@async_io_helper.wrap(get_helper)
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def count(io_helper=None):
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if not io_helper: return
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count = 1
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while 1:
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print "Current count:", count
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yield "Press 'c' to increase the count or hit 'q' to quit: "
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if io_helper.get_input() == 'c': count += 1
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if io_helper.get_input() == 'q': return
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count()
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print helper.get_output()
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helper.handle_input('c')
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print helper.get_output()
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helper.handle_input('q')
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"""
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def new_helper():
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return _helper()
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def wrap(get_io_helper_func):
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"""A decorator that takes one argument. The argument should be an instance
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of the helper class returned by new_helper(). This decorator wraps a method
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so that is may perform asynchronous IO using the helper instance. The
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method being wrapped should take a keyword argument 'io_helper' which will
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be set to the helper instance passed in."""
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def decorator_factory(func):
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def func_wrapper(*args, **kwargs):
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if not "io_helper" in kwargs:
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kwargs["io_helper"] = get_io_helper_func()
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helper = kwargs["io_helper"]
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helper._generator = func(*args, **kwargs)
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helper._next()
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func_wrapper.__doc__ = func.__doc__
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func_wrapper.__name__ = func.__name__
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return func_wrapper
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return decorator_factory
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class _helper(object):
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def __init__(self):
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self._clear()
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def get_input(self):
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return self._input_line
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def get_output(self):
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return self._output
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def handle_input(self, line):
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"""Handle an input line. Returns false if the input is not used
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because there is no object waiting on asynchronous input. Returns
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true if the input line is fed to an object that was waiting for
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asynchronous input."""
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if not self._generator: return False
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if not isinstance(line, str):
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raise ValueError("Expected string argument")
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self._input_line = line
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self._next()
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return True
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def _next(self):
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try: self._output = self._generator.next()
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except StopIteration: self._clear()
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except Exception, err:
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# Uncomment for debugging.
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#import sys
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#import traceback
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#traceback.print_exc(file=sys.stdout)
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self._clear()
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raise(err)
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def _clear(self):
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self._input_line = str()
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self._generator = None
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self._output = None
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#############################################################################
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#
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# The following code is not needed for this module's main functionality.
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# You can call start_prompt(helper, locals()) to an interpreter that mimics
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# the standard python prompt but allows you to call asynchronous IO methods
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# that use the helper passed to start_prompt. You can use this for testing
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# or from a gui with embeded python.
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#
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import cmd
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import code
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def start_prompt(io_helper, locals_dict=None):
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p = _prompt(io_helper, locals_dict)
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p.cmdloop()
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class _prompt(cmd.Cmd):
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def __init__(self, io_helper, locals_dict):
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cmd.Cmd.__init__(self)
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self.prompt = ">>> "
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self._interp = code.InteractiveConsole(locals_dict)
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self._ioHelper = io_helper
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def _exitcmd(self, s):
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if s == "EOF": print
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return s == "exit()" or s == "EOF"
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def _prepare_cmd(self, s):
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return s.rstrip().replace("\r\n", "\n").replace("\r", "\n") + "\n"
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def onecmd(self, s):
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prompt = ">>> "
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if not self._ioHelper.handle_input(s):
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if self._exitcmd(s): return True
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if self._interp.push(self._prepare_cmd(s)): prompt = "... "
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if self._ioHelper.get_output():
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prompt = self._ioHelper.get_output()
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self.prompt = prompt
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return False
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