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Added a Tk error dialog to run.py inform the user if the subprocess can't 

connect to the user GUI process.  Added a timeout to the GUI's listening
socket.  Added Tk error dialogs to PyShell.py to announce a failure to bind
the port or connect to the subprocess.  Clean up error handling during
connection initiation phase.  This is an update of Python Patch 778323.

M NEWS.txt
M PyShell.py
M ScriptBinding.py
M run.py

Backport candidate.
This commit is contained in:
Kurt B. Kaiser 2004-01-21 18:54:30 +00:00
parent 1fe9750200
commit af3eb87802
4 changed files with 96 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Lib/idlelib/NEWS.txt
View File

@ -3,6 +3,12 @@ What's New in IDLE 1.1a0?
*Release date: XX-XXX-2004*
- Added a Tk error dialog to run.py inform the user if the subprocess can't
connect to the user GUI process. Added a timeout to the GUI's listening
socket. Added Tk error dialogs to PyShell.py to announce a failure to bind
the port or connect to the subprocess. Clean up error handling during
connection initiation phase. This is an update of Python Patch 778323.
- Print correct exception even if source file changed since shell was
restarted. IDLEfork Patch 869012 Noam Raphael

105
Lib/idlelib/PyShell.py
View File

@ -251,7 +251,9 @@ class PyShellFileList(FileList):
self.pyshell.wakeup()
else:
self.pyshell = PyShell(self)
self.pyshell.begin()
if self.pyshell:
if not self.pyshell.begin():
return None
return self.pyshell
@ -344,6 +346,9 @@ class ModifiedInterpreter(InteractiveInterpreter):
return [decorated_exec] + w + ["-c", command, str(self.port)]
def start_subprocess(self):
# spawning first avoids passing a listening socket to the subprocess
self.spawn_subprocess()
#time.sleep(20) # test to simulate GUI not accepting connection
addr = (LOCALHOST, self.port)
# Idle starts listening for connection on localhost
for i in range(3):
@ -352,14 +357,17 @@ class ModifiedInterpreter(InteractiveInterpreter):
self.rpcclt = MyRPCClient(addr)
break
except socket.error, err:
print>>sys.__stderr__,"IDLE socket error: " + err[1]\
+ ", retrying..."
pass
else:
display_port_binding_error()
sys.exit()
self.spawn_subprocess()
self.display_port_binding_error()
return None
# Accept the connection from the Python execution server
self.rpcclt.listening_sock.settimeout(10)
try:
self.rpcclt.accept()
except socket.timeout, err:
self.display_no_subprocess_error()
return None
self.rpcclt.register("stdin", self.tkconsole)
self.rpcclt.register("stdout", self.tkconsole.stdout)
self.rpcclt.register("stderr", self.tkconsole.stderr)
@ -368,10 +376,11 @@ class ModifiedInterpreter(InteractiveInterpreter):
self.rpcclt.register("interp", self)
self.transfer_path()
self.poll_subprocess()
return self.rpcclt
def restart_subprocess(self):
if self.restarting:
return
return self.rpcclt
self.restarting = True
# close only the subprocess debugger
debug = self.getdebugger()
@ -388,7 +397,11 @@ class ModifiedInterpreter(InteractiveInterpreter):
was_executing = console.executing
console.executing = False
self.spawn_subprocess()
try:
self.rpcclt.accept()
except socket.timeout, err:
self.display_no_subprocess_error()
return None
self.transfer_path()
# annotate restart in shell window and mark it
console.text.delete("iomark", "end-1c")
@ -407,6 +420,7 @@ class ModifiedInterpreter(InteractiveInterpreter):
# reload remote debugger breakpoints for all PyShellEditWindows
debug.load_breakpoints()
self.restarting = False
return self.rpcclt
def __request_interrupt(self):
self.rpcclt.remotecall("exec", "interrupt_the_server", (), {})
@ -415,7 +429,10 @@ class ModifiedInterpreter(InteractiveInterpreter):
threading.Thread(target=self.__request_interrupt).start()
def kill_subprocess(self):
try:
self.rpcclt.close()
except AttributeError: # no socket
pass
self.unix_terminate()
self.tkconsole.executing = False
self.rpcclt = None
@ -638,13 +655,6 @@ class ModifiedInterpreter(InteractiveInterpreter):
if key[:1] + key[-1:] != "<>":
del c[key]
def display_executing_dialog(self):
tkMessageBox.showerror(
"Already executing",
"The Python Shell window is already executing a command; "
"please wait until it is finished.",
master=self.tkconsole.text)
def runcommand(self, code):
"Run the code without invoking the debugger"
# The code better not raise an exception!
@ -695,6 +705,34 @@ class ModifiedInterpreter(InteractiveInterpreter):
"Override base class method"
self.tkconsole.stderr.write(s)
def display_port_binding_error(self):
tkMessageBox.showerror(
"Port Binding Error",
"IDLE can't bind TCP/IP port 8833, which is necessary to "
"communicate with its Python execution server. Either "
"no networking is installed on this computer or another "
"process (another IDLE?) is using the port. Run IDLE with the -n "
"command line switch to start without a subprocess and refer to "
"Help/IDLE Help 'Running without a subprocess' for further "
"details.",
master=self.tkconsole.text)
def display_no_subprocess_error(self):
tkMessageBox.showerror(
"Subprocess Startup Error",
"IDLE's subprocess didn't make connection. Either IDLE can't "
"start a subprocess or personal firewall software is blocking "
"the connection.",
master=self.tkconsole.text)
def display_executing_dialog(self):
tkMessageBox.showerror(
"Already executing",
"The Python Shell window is already executing a command; "
"please wait until it is finished.",
master=self.tkconsole.text)
class PyShell(OutputWindow):
shell_title = "Python Shell"
@ -765,8 +803,6 @@ class PyShell(OutputWindow):
self.history = self.History(self.text)
#
self.pollinterval = 50 # millisec
if use_subprocess:
self.interp.start_subprocess()
reading = False
executing = False
@ -887,6 +923,10 @@ class PyShell(OutputWindow):
self.resetoutput()
if use_subprocess:
nosub = ''
client = self.interp.start_subprocess()
if not client:
self.close()
return None
else:
nosub = "==== No Subprocess ===="
self.write("Python %s on %s\n%s\n%s\nIDLE %s %s\n" %
@ -894,11 +934,8 @@ class PyShell(OutputWindow):
self.firewallmessage, idlever.IDLE_VERSION, nosub))
self.showprompt()
import Tkinter
Tkinter._default_root = None
def interact(self):
self.begin()
self.top.mainloop()
Tkinter._default_root = None # 03Jan04 KBK What's this?
return client
def readline(self):
save = self.reading
@ -1282,10 +1319,8 @@ def main():
if not args:
flist.new()
if enable_shell:
flist.open_shell()
elif enable_shell:
flist.pyshell = PyShell(flist)
flist.pyshell.begin()
if not flist.open_shell():
return # couldn't open shell
shell = flist.pyshell
# handle remaining options:
if debug:
@ -1295,7 +1330,7 @@ def main():
os.environ.get("PYTHONSTARTUP")
if filename and os.path.isfile(filename):
shell.interp.execfile(filename)
if cmd or script:
if shell and cmd or script:
shell.interp.runcommand("""if 1:
import sys as _sys
_sys.argv = %s
@ -1309,24 +1344,6 @@ def main():
root.mainloop()
root.destroy()
def display_port_binding_error():
print """\
\nIDLE cannot run.
IDLE needs to use a specific TCP/IP port (8833) in order to communicate with
its Python execution server. IDLE is unable to bind to this port, and so
cannot start. Here are some possible causes of this problem:
1. TCP/IP networking is not installed or not working on this computer
2. Another program (another IDLE?) is running that uses this port
3. Personal firewall software is preventing IDLE from using this port
Run IDLE with the -n command line switch to start without a subprocess
and refer to Help/IDLE Help "Running without a subprocess" for further
details.
"""
if __name__ == "__main__":
sys.modules['PyShell'] = sys.modules['__main__']
main()

2
Lib/idlelib/ScriptBinding.py
View File

@ -137,6 +137,8 @@ class ScriptBinding:
return
flist = self.editwin.flist
shell = flist.open_shell()
if not shell:
return # couldn't open the shell
interp = shell.interp
if PyShell.use_subprocess:
shell.restart_shell()

27
Lib/idlelib/run.py
View File

@ -47,6 +47,7 @@ def main(del_exitfunc=False):
global no_exitfunc
no_exitfunc = del_exitfunc
port = 8833
#time.sleep(15) # test subprocess not responding
if sys.argv[1:]:
port = int(sys.argv[1])
sys.argv[:] = [""]
@ -90,24 +91,38 @@ def main(del_exitfunc=False):
continue
def manage_socket(address):
for i in range(6):
for i in range(3):
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: "\
print>>sys.__stderr__,"IDLE Subprocess: socket error: "\
+ err[1] + ", retrying...."
else:
print>>sys.__stderr__, "\nConnection to Idle failed, exiting."
print>>sys.__stderr__, "IDLE Subprocess: Connection to "\
"IDLE GUI failed, exiting."
show_socket_error(err, address)
global exit_now
exit_now = True
return
server.handle_request() # A single request only
def show_socket_error(err, address):
import Tkinter
import tkMessageBox
root = Tkinter.Tk()
root.withdraw()
if err[0] == 61: # connection refused
msg = "IDLE's subprocess can't connect to %s:%d. This may be due "\
"to your personal firewall configuration. It is safe to "\
"allow this internal connection because no data is visible on "\
"external ports." % address
tkMessageBox.showerror("IDLE Subprocess Error", msg, parent=root)
else:
tkMessageBox.showerror("IDLE Subprocess Error", "Socket Error: %s" % err[1])
root.destroy()
def print_exception():
import linecache
linecache.checkcache()