def worker_ping(rank, nodes):
'''ping a single node'''
node = nodes[rank]
nodename = NODESET.get_nodename_from_interface(node)
packets_received = 0
# execute ping command and show output with the nodename
cmd = '%s %s' % (synctool_param.PING_CMD, node)
cmd_arr = shlex.split(cmd)
f = synctool_lib.popen(cmd_arr)
if not f:
stderr('failed to run command %s' % cmd_arr[0])
return
while True:
line = f.readline()
if not line:
break
line = string.strip(line)
#
# argh, we have to parse output here
# ping says something like:
# "2 packets transmitted, 0 packets received, 100.0% packet loss" on BSD
# "2 packets transmitted, 0 received, 100.0% packet loss, time 1001ms" on Linux
#
arr = string.split(line)
if len(arr) > 3 and arr[1] == 'packets' and arr[2] == 'transmitted,':
try:
packets_received = int(arr[3])
except ValueError:
pass
break
# some ping implementations say "hostname is alive" or "hostname is unreachable"
elif len(arr) == 3 and arr[1] == 'is':
if arr[2] == 'alive':
packets_received = 100
elif arr[2] == 'unreachable':
packets_received = -1
f.close()
if packets_received > 0:
print '%s: up' % nodename
else:
print '%s: not responding' % nodename
def run(cmd_args):
'''pipe the output through the aggregator'''
#
# simply re-run this command, but with a pipe
#
if '-a' in cmd_args:
cmd_args.remove('-a')
if '--aggregate' in cmd_args:
cmd_args.remove('--aggregate')
f = popen(cmd_args)
if not f:
stderr('failed to run %s' % cmd_args[0])
aggregate(f)
f.close()
