import time
from functools import wraps
from qa.utils.easy_popen import run
def retry(ExceptionToCheck, tries=4, delay=5, backoff=2, logger=None):
""" Retry calling the decorated function """
def deco_retry(f):
@wraps(f)
def f_retry(*args, **kwargs):
mtries, mdelay = tries, delay
while mtries > 1:
try:
return f(*args, **kwargs)
except ExceptionToCheck, e:
msg = "%s, Retrying in %d seconds..." % (str(e), mdelay)
if logger:
logger.warning(msg)
else:
print msg
time.sleep(mdelay)
mtries -= 1
mdelay *= backoff
return f(*args, **kwargs)
return f_retry # true decorator
return deco_retry
@retry(Exception, tries=4, delay=2)
def test_network(text):
try:
cmd = "ifconfig -a"
stdout, stderr, exit_code = run(cmd, timeout=300)
print stdout, stderr, exit_code
if exit_code != 0:
raise RuntimeError("ERROR (exit_code %d): "
"\nstdout: %s\nstderr: %s\n" % (exit_code,
stdout, stderr))
except Exception as e:
print str(e)
raise Exception("Failed")
print "Success: ", text
test_network("it works!")
All that I am trying to do here is write a generic function that will
re-retry
the command few more times before failing the test
Case 1: + ve case ( say cmd= ifconfig –a )
gpal-zkj2wrc-1# python file5.py
vmx0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,ISIINTERNAL>
metric 0 mtu 1500
options=403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO>
ether 00:50:56:90:ef:3d
inet 1.224.39.1 netmask 0xffff0000 broadcast 1.224.255.255 zone 1
inet6 fe80::250:56ff:fe90:ef3d%vmx0 prefixlen 64 scopeid 0x1 zone 1
inet6 fdfe:9042:c53d:0:250:56ff:fe90:ef3d prefixlen 64 zone 1
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
media: Ethernet 10Gbase-T
status: active
vmx1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO>
ether 00:50:56:90:62:44
inet 10.224.39.1 netmask 0xfffffc00 broadcast 10.224.39.255 zone 1
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet 10Gbase-T
status: active
Case 1 : Say I have invalid input command ( say ifconfig –a ) it will work
gpal-zkj2wrc-1# python file5.py
ifconfig: illegal option -- z
usage: ifconfig [-f type:format] [-L] [-C] [-g groupname] interface
address_family
[address [dest_address]] [parameters]
ifconfig interface create
ifconfig -a [-L] [-C] [-g groupname] [-d] [-m] [-u] [-v]
[address_family]
ifconfig -l [-d] [-u] [address_family]
ifconfig [-L] [-C] [-g groupname] [-d] [-m] [-u] [-v]
1
ERROR (exit_code 1):
stdout:
stderr: ifconfig: illegal option -- z
usage: ifconfig [-f type:format] [-L] [-C] [-g groupname] interface
address_family
[address [dest_address]] [parameters]
ifconfig interface create
ifconfig -a [-L] [-C] [-g groupname] [-d] [-m] [-u] [-v]
[address_family]
ifconfig -l [-d] [-u] [address_family]
ifconfig [-L] [-C] [-g groupname] [-d] [-m] [-u] [-v]
Failed, Retrying in 2 seconds...
ifconfig: illegal option -- z
usage: ifconfig [-f type:format] [-L] [-C] [-g groupname] interface
address_family
[address [dest_address]] [parameters]
ifconfig interface create
ifconfig -a [-L] [-C] [-g groupname] [-d] [-m] [-u] [-v]
[address_family]
ifconfig -l [-d] [-u] [address_family]
ifconfig [-L] [-C] [-g groupname] [-d] [-m] [-u] [-v]
1
ERROR (exit_code 1):
stdout:
stderr: ifconfig: illegal option -- z
usage: ifconfig [-f type:format] [-L] [-C] [-g groupname] interface
address_family
[address [dest_address]] [parameters]
ifconfig interface create
ifconfig -a [-L] [-C] [-g groupname] [-d] [-m] [-u] [-v]
[address_family]
ifconfig -l [-d] [-u] [address_family]
ifconfig [-L] [-C] [-g groupname] [-d] [-m] [-u] [-v]
Failed, Retrying in 4 seconds...
Case 3: Assuming my command threw an exception say OSError , how do I
retry a command only for a specific exception / error
I am on Python 2.7 and Linux
Regards,
Ganesh Pal
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