def do_px(self, line):
"""Execute a Python statement.
Node names may be used, e.g.: px print h1.cmd('ls')"""
try:
exec(line, globals(), self.getLocals())
except Exception as e:
output(str(e) + '\n')
def do_dpctl(self, line):
"""Run dpctl (or ovs-ofctl) command on all switches.
Usage: dpctl command [arg1] [arg2] ..."""
args = line.split()
if len(args) < 1:
error('usage: dpctl command [arg1] [arg2] ...\n')
return
for sw in self.mn.switches:
output('*** ' + sw.name + ' ' + ('-' * 72) + '\n')
output(sw.dpctl(*args))
def waitForNode(self, node):
"Wait for a node to finish, and print its output."
# Pollers
nodePoller = poll()
nodePoller.register(node.stdout)
bothPoller = poll()
bothPoller.register(self.stdin, POLLIN)
bothPoller.register(node.stdout, POLLIN)
if self.isatty():
# Buffer by character, so that interactive
# commands sort of work
quietRun('stty -isig -icanon min 1')
while node.shell:
try:
bothPoller.poll()
# XXX BL: this doesn't quite do what we want.
if False and self.inputFile:
key = self.inputFile.read(1)
if key is not '':
node.write(key)
else:
self.inputFile = None
if isReadable(self.inPoller):
key = self.stdin.read(1)
node.write(key)
if isReadable(nodePoller):
data = node.monitor()
output(data)
if not node.waiting:
quietRun('stty isig')
break
except KeyboardInterrupt:
# There is an at least one race condition here, since
# it's possible to interrupt ourselves after we've
# read data but before it has been printed.
node.sendInt()
"""
#TODO THERE ARE YOU NEED TO SEND OWN INTERRUPT
"""
except select.error as e:
# pylint: disable=unpacking-non-sequence
errno_, errmsg = e.args
# pylint: enable=unpacking-non-sequence
if errno_ != errno.EINTR:
error("select.error: %d, %s" % (errno_, errmsg))
node.sendInt()
def dumpNodeConnections( nodes ):
"Dump connections to/from nodes."
def dumpConnections( node ):
"Helper function: dump connections to node"
for intf in node.intfList():
output( ' %s:' % intf )
if intf.link:
intfs = [ intf.link.intf1, intf.link.intf2 ]
intfs.remove( intf )
output( intfs[ 0 ] )
else:
output( ' ' )
for node in nodes:
output( node.name )
dumpConnections( node )
output( '\n' )
def run(self):
"Run our cmdloop(), catching KeyboardInterrupt"
while True:
try:
# Make sure no nodes are still waiting
for node in self.mn.values():
while node.waiting:
info('stopping', node, '\n')
node.sendInt()
node.waitOutput()
if self.isatty():
quietRun('stty echo sane intr ^C')
self.cmdloop()
break
except KeyboardInterrupt:
# Output a message - unless it's also interrupted
# pylint: disable=broad-except
try:
output('\nInterrupt\n')
except Exception:
pass
def dumpPorts( switches ):
"dump interface to openflow port mappings for each switch"
for switch in switches:
output( '%s ' % switch.name )
for intf in switch.intfList():
port = switch.ports[ intf ]
output( '%s:%d ' % ( intf, port ) )
output( '\n' )
def dumpConnections( node ):
"Helper function: dump connections to node"
for intf in node.intfList():
output( ' %s:' % intf )
if intf.link:
intfs = [ intf.link.intf1, intf.link.intf2 ]
intfs.remove( intf )
output( intfs[ 0 ] )
else:
output( ' ' )
def do_py(self, line):
"""Evaluate a Python expression.
Node names may be used, e.g.: py h1.cmd('ls')"""
try:
result = eval(line, globals(), self.getLocals())
if not result:
return
elif isinstance(result, str):
output(result + '\n')
else:
output(repr(result) + '\n')
except Exception as e:
output(str(e) + '\n')
def do_links(self, _line):
"Report on links"
for link in self.mn.links:
output(link, link.status(), '\n')
def do_time(self, line):
"Measure time taken for any command in Mininet."
start = time.time()
self.onecmd(line)
elapsed = time.time() - start
output("*** Elapsed time: %0.6f secs\n" % elapsed)
def do_EOF(self, line):
"Exit"
output('\n')
return self.do_exit(line)
def do_dump(self, _line):
"Dump node info."
for node in self.mn.values():
output('%s\n' % repr(node))
def do_intfs(self, _line):
"List interfaces."
for node in self.mn.values():
output('%s: %s\n' % (node.name, ','.join(node.intfNames())))
def do_nodes(self, _line):
"List all nodes."
nodes = ' '.join(sorted(self.mn))
output('available nodes are: \n%s\n' % nodes)
def do_help(self, line):
"Describe available CLI commands."
RCmd.do_help(self, line)
if line is '':
output(self.helpStr)
def errRun( *cmd, **kwargs ):
"""Run a command and return stdout, stderr and return code
cmd: string or list of command and args
stderr: STDOUT to merge stderr with stdout
shell: run command using shell
echo: monitor output to console"""
# By default we separate stderr, don't run in a shell, and don't echo
stderr = kwargs.get( 'stderr', PIPE )
shell = kwargs.get( 'shell', False )
echo = kwargs.get( 'echo', False )
if echo:
# cmd goes to stderr, output goes to stdout
info( cmd, '\n' )
if len( cmd ) == 1:
cmd = cmd[ 0 ]
# Allow passing in a list or a string
if isinstance( cmd, BaseString ) and not shell:
cmd = cmd.split( ' ' )
cmd = [ str( arg ) for arg in cmd ]
elif isinstance( cmd, list ) and shell:
cmd = " ".join( arg for arg in cmd )
debug( '*** errRun:', cmd, '\n' )
popen = Popen( cmd, stdout=PIPE, stderr=stderr, shell=shell )
# We use poll() because select() doesn't work with large fd numbers,
# and thus communicate() doesn't work either
out, err = '', ''
poller = poll()
poller.register( popen.stdout, POLLIN )
fdtofile = { popen.stdout.fileno(): popen.stdout }
outDone, errDone = False, True
if popen.stderr:
fdtofile[ popen.stderr.fileno() ] = popen.stderr
poller.register( popen.stderr, POLLIN )
errDone = False
while not outDone or not errDone:
readable = poller.poll()
for fd, event in readable:
f = fdtofile[ fd ]
if event & POLLIN:
data = f.read( 1024 )
if Python3:
data = data.decode( Encoding )
if echo:
output( data )
if f == popen.stdout:
out += data
if data == '':
outDone = True
elif f == popen.stderr:
err += data
if data == '':
errDone = True
else: # POLLHUP or something unexpected
if f == popen.stdout:
outDone = True
elif f == popen.stderr:
errDone = True
poller.unregister( fd )
returncode = popen.wait()
# Python 3 complains if we don't explicitly close these
popen.stdout.close()
if stderr == PIPE:
popen.stderr.close()
debug( out, err, returncode )
return out, err, returncode
