[PATCH 05/18] KVM Test: Add a common ping module for network related tests

Lucas Meneghel Rodrigues
2010-09-14T22:25:30Z

The kvm_net_utils.py is a just a place that wraps common network
related commands which is used to do the network-related tests.
Use -1 as the packet ratio for loss analysis.
Use quiet mode when doing the flood ping.

Changes from v1:
- Use None to indicate that the session should be local in raw_ping
- Use session.sendline("\003") to send (ctrl+c) signal
- Use None to indicate that the session should be local
- Fix of coding style

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Amos Kong <akong@redhat.com>
---
client/tests/kvm/kvm_test_utils.py | 112 +++++++++++++++++++++++++++++++++++-
1 files changed, 111 insertions(+), 1 deletions(-)

diff --git a/client/tests/kvm/kvm_test_utils.py b/client/tests/kvm/kvm_test_utils.py
index 5412aac..1e4bd9d 100644
--- a/client/tests/kvm/kvm_test_utils.py
+++ b/client/tests/kvm/kvm_test_utils.py
@@ -21,7 +21,7 @@ More specifically:
@copyright: 2008-2009 Red Hat Inc.
"""

-import time, os, logging, re, commands
+import time, os, logging, re, commands, signal
from autotest_lib.client.common_lib import error
from autotest_lib.client.bin import utils
import kvm_utils, kvm_vm, kvm_subprocess, scan_results
@@ -505,3 +505,113 @@ def run_autotest(vm, session, control_path, timeout, outputdir):
e_msg = ("Tests %s failed during control file execution" %
" ".join(bad_results))
raise error.TestFail(e_msg)
+
+
+def get_loss_ratio(output):
+ """
+ Get the packet loss ratio from the output of ping
+.
+ @param output: Ping output.
+ """
+ try:
+ return int(re.findall('(\d+)% packet loss', output)[0])
+ except IndexError:
+ logging.debug(output)
+ return -1
+
+
+def raw_ping(command, timeout, session, output_func):
+ """
+ Low-level ping command execution.
+
+ @param command: Ping command.
+ @param timeout: Timeout of the ping command.
+ @param session: Local executon hint or session to execute the ping command.
+ """
+ if session is None:
+ process = kvm_subprocess.run_bg(command, output_func=output_func,
+ timeout=timeout)
+
+ # Send SIGINT signal to notify the timeout of running ping process,
+ # Because ping have the ability to catch the SIGINT signal so we can
+ # always get the packet loss ratio even if timeout.
+ if process.is_alive():
+ kvm_utils.kill_process_tree(process.get_pid(), signal.SIGINT)
+
+ status = process.get_status()
+ output = process.get_output()
+
+ process.close()
+ return status, output
+ else:
+ session.sendline(command)
+ status, output = session.read_up_to_prompt(timeout=timeout,
+ print_func=output_func)
+ if not status:
+ # Send ctrl+c (SIGINT) through ssh session
+ session.send("\003")
+ status, output2 = session.read_up_to_prompt(print_func=output_func)
+ output += output2
+ if not status:
+ # We also need to use this session to query the return value
+ session.send("\003")
+
+ session.sendline(session.status_test_command)
+ s2, o2 = session.read_up_to_prompt()
+ if not s2:
+ status = -1
+ else:
+ try:
+ status = int(re.findall("\d+", o2)[0])
+ except:
+ status = -1
+
+ return status, output
+
+
+def ping(dest=None, count=None, interval=None, interface=None,
+ packetsize=None, ttl=None, hint=None, adaptive=False,
+ broadcast=False, flood=False, timeout=0,
+ output_func=logging.debug, session=None):
+ """
+ Wrapper of ping.
+
+ @param dest: Destination address.
+ @param count: Count of icmp packet.
+ @param interval: Interval of two icmp echo request.
+ @param interface: Specified interface of the source address.
+ @param packetsize: Packet size of icmp.
+ @param ttl: IP time to live.
+ @param hint: Path mtu discovery hint.
+ @param adaptive: Adaptive ping flag.
+ @param broadcast: Broadcast ping flag.
+ @param flood: Flood ping flag.
+ @param timeout: Timeout for the ping command.
+ @param output_func: Function used to log the result of ping.
+ @param session: Local executon hint or session to execute the ping command.
+ """
+ if dest is not None:
+ command = "ping %s " % dest
+ else:
+ command = "ping localhost "
+ if count is not None:
+ command += " -c %s" % count
+ if interval is not None:
+ command += " -i %s" % interval
+ if interface is not None:
+ command += " -I %s" % interface
+ if packetsize is not None:
+ command += " -s %s" % packetsize
+ if ttl is not None:
+ command += " -t %s" % ttl
+ if hint is not None:
+ command += " -M %s" % hint
+ if adaptive:
+ command += " -A"
+ if broadcast:
+ command += " -b"
+ if flood:
+ command += " -f -q"
+ output_func = None
+
+ return raw_ping(command, timeout, session, output_func)
--
1.7.2.2