foo Python 2.6.1 (r261:67515, Jun 4 2009, 11:06:31) [GCC 4.1.2 20071124 (Red Hat 4.1.2-43)] on linux2 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole)
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(most recent call last): File "/sw/external/twisted-8.2.0/lib/python/twisted/python/log.py", line 84, in callWithLogger return callWithContext({"system": lp}, func, *args, **kw) File "/sw/external/twisted-8.2.0/lib/python/twisted/python/log.py", line 69, in callWithContext return context.call({ILogContext: newCtx}, func, *args, **kw) File "/sw/external/twisted-8.2.0/lib/python/twisted/python/context.py",
Dear twisted-python, I’m trying to integrate a python REPL into my existing twisted 8.2.0 client-side program (which talks to another twisted server running a custom protocol). This client side program uses twisted.internet.stdio.StandardIO already to interact with the user, to read commands from the user and send them to the server. What’s the best way to add functionality to drop into a python REPL? I adapted the doc/core/examples/stdin.py code below to drop into the ‘code’ stdlib module to try to model for the mailing list what my larger client program is trying to do. It works fine on linux, until you enter a command which outputs a large amount of data, at which point you get a “Resource temporarily unavailable” as can be seen below. I’m assuming the issue is related to StandardIO taking control of reads/writes to the stdio file descriptors, and not integrating well with python code that writes directly to sys.stderr, but I’m not sure what the right solution is. I don’t mind that the call to ‘code.interact()’ blocks the reactor for my use case, but I don’t mind if better solutions are available which don’t have that problem, either. Modified doc/core/examples/stdin.py: --------------------------------------- """ An example of reading a line at a time from standard input without blocking the reactor. """ from twisted.internet import stdio from twisted.protocols import basic class Echo(basic.LineReceiver): from os import linesep as delimiter def connectionMade(self): self.transport.write('> ') def lineReceived(self, line): self.sendLine('Echo: ' + line) self.transport.write('> ') import code code.interact() def main(): stdio.StandardIO(Echo()) from twisted.internet import reactor reactor.run() if __name__ == '__main__': main() --------------------------------------- A sample run: $ ./twisted-stdio.py line 59, in callWithContext return self.currentContext().callWithContext(ctx, func, *args, **kw) File "/sw/external/twisted-8.2.0/lib/python/twisted/python/context.py", line 37, in callWithContext return func(*args,**kw) --- <exception caught here> --- File "/sw/external/twisted-8.2.0/lib/python/twisted/internet/selectreactor.py", line 146, in _doReadOrWrite why = getattr(selectable, method)() File "/sw/external/twisted-8.2.0/lib/python/twisted/internet/process.py", line 242, in doRead return fdesc.readFromFD(self.fd, self.dataReceived) File "/sw/external/twisted-8.2.0/lib/python/twisted/internet/fdesc.py", line 70, in readFromFD callback(output) File "/sw/external/twisted-8.2.0/lib/python/twisted/internet/process.py", line 245, in dataReceived self.proc.childDataReceived(self.name, data) File "/sw/external/twisted-8.2.0/lib/python/twisted/internet/_posixstdio.py", line 73, in childDataReceived self.protocol.dataReceived(data) File "/sw/external/twisted-8.2.0/lib/python/twisted/protocols/basic.py", line 231, in dataReceived why = self.lineReceived(line) File "./twisted-stdio.py", line 27, in lineReceived code.interact() File "/sw/external/python-2.6.1/lib/python2.6/code.py", line 306, in interact console.interact(banner) File "/sw/external/python-2.6.1/lib/python2.6/code.py", line 243, in interact more = self.push(line) File "/sw/external/python-2.6.1/lib/python2.6/code.py", line 265, in push more = self.runsource(source, self.filename) File "/sw/external/python-2.6.1/lib/python2.6/code.py", line 87, in runsource self.runcode(code) File "/sw/external/python-2.6.1/lib/python2.6/code.py", line 107, in runcode self.showtraceback() File "/sw/external/python-2.6.1/lib/python2.6/code.py", line 162, in showtraceback map(self.write, list) File "/sw/external/python-2.6.1/lib/python2.6/code.py", line 171, in write sys.stderr.write(data) exceptions.IOError: [Errno 11] Resource temporarily unavailable My colleague discovered the below workaround which temporarily changes the nonblocking status of sys.stderr (and restores it afterwards), but feels like a hack which violates across abstraction layers and which might not work correctly in future versions of twisted: + import fcntl + oldval = fcntl.fcntl(sys.stderr.fileno(), fcntl.F_GETFL) + fcntl.fcntl(sys.stderr.fileno(), fcntl.F_SETFL, oldval & ~os.O_NONBLOCK) code.interact() + fcntl.fcntl(sys.stderr.fileno(), fcntl.F_SETFL, oldval) So, any tips on integrating a REPL into our existing program without resorting to this hack would be appreciated! Thanks. -- Benjamin