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import signal
import os
import pexpect
import traceback
from log import *
class Hook(object):
"""
Generic hooks before/after API/CLI calls
"""
def __init__(self, logger):
self.logger = logger
def before_api(self, api_name, api_args):
"""
Function called before API call
Emit a debug message describing the API name and arguments
@param api_name: name of the API
@param api_args: tuple containing the API arguments
"""
self.logger.debug("API: %s (%s)" %
(api_name, api_args), extra={'color': RED})
def after_api(self, api_name, api_args):
"""
Function called after API call
@param api_name: name of the API
@param api_args: tuple containing the API arguments
"""
pass
def before_cli(self, cli):
"""
Function called before CLI call
Emit a debug message describing the CLI
@param cli: CLI string
"""
self.logger.debug("CLI: %s" % (cli), extra={'color': RED})
def after_cli(self, cli):
"""
Function called after CLI call
"""
pass
class VppDiedError(Exception):
pass
class PollHook(Hook):
""" Hook which checks if the vpp subprocess is alive """
def __init__(self, testcase):
self.vpp_dead = False
self.testcase = testcase
self.logger = testcase.logger
def spawn_gdb(self, gdb_path, core_path):
gdb_cmdline = gdb_path + ' ' + self.testcase.vpp_bin + ' ' + core_path
gdb = pexpect.spawn(gdb_cmdline)
gdb.interact()
try:
gdb.terminate(True)
except:
pass
if gdb.isalive():
raise Exception("GDB refused to die...")
def on_crash(self, core_path):
if self.testcase.interactive:
gdb_path = '/usr/bin/gdb'
if os.path.isfile(gdb_path) and os.access(gdb_path, os.X_OK):
# automatically attach gdb
self.spawn_gdb(gdb_path, core_path)
return
else:
self.logger.error(
"Debugger '%s' does not exist or is not an executable.." %
gdb_path)
self.logger.critical('core file present, debug with: gdb ' +
self.testcase.vpp_bin + ' ' + core_path)
def poll_vpp(self):
"""
Poll the vpp status and throw an exception if it's not running
:raises VppDiedError: exception if VPP is not running anymore
"""
if self.vpp_dead:
# already dead, nothing to do
return
self.testcase.vpp.poll()
if self.testcase.vpp.returncode is not None:
signaldict = dict(
(k, v) for v, k in reversed(sorted(signal.__dict__.items()))
if v.startswith('SIG') and not v.startswith('SIG_'))
msg = "VPP subprocess died unexpectedly with returncode %d [%s]" % (
self.testcase.vpp.returncode,
signaldict[abs(self.testcase.vpp.returncode)])
self.logger.critical(msg)
core_path = self.testcase.tempdir + '/core'
if os.path.isfile(core_path):
self.on_crash(core_path)
self.testcase.vpp_dead = True
raise VppDiedError(msg)
def after_api(self, api_name, api_args):
"""
Check if VPP died after executing an API
:param api_name: name of the API
:param api_args: tuple containing the API arguments
:raises VppDiedError: exception if VPP is not running anymore
"""
super(PollHook, self).after_api(api_name, api_args)
self.poll_vpp()
def after_cli(self, cli):
"""
Check if VPP died after executing a CLI
:param cli: CLI string
:raises Exception: exception if VPP is not running anymore
"""
super(PollHook, self).after_cli(cli)
self.poll_vpp()
class StepHook(PollHook):
""" Hook which requires user to press ENTER before doing any API/CLI """
def __init__(self, testcase):
self.skip_stack = None
self.skip_num = None
self.skip_count = 0
super(StepHook, self).__init__(testcase)
def skip(self):
if self.skip_stack is None:
return False
stack = traceback.extract_stack()
counter = 0
skip = True
for e in stack:
if counter > self.skip_num:
break
if e[0] != self.skip_stack[counter][0]:
skip = False
if e[1] != self.skip_stack[counter][1]:
skip = False
counter += 1
if skip:
self.skip_count += 1
return True
else:
print("%d API/CLI calls skipped in specified stack "
"frame" % self.skip_count)
self.skip_count = 0
self.skip_stack = None
self.skip_num = None
return False
def user_input(self):
print('number\tfunction\tfile\tcode')
counter = 0
stack = traceback.extract_stack()
for e in stack:
print('%02d.\t%s\t%s:%d\t[%s]' % (counter, e[2], e[0], e[1], e[3]))
counter += 1
print(single_line_delim)
print("You can enter a number of stack frame chosen from above")
print("Calls in/below that stack frame will be not be stepped anymore")
print(single_line_delim)
while True:
choice = raw_input("Enter your choice, if any, and press ENTER to "
"continue running the testcase...")
if choice == "":
choice = None
try:
if choice is not None:
num = int(choice)
except:
print("Invalid input")
continue
if choice is not None and (num < 0 or num >= len(stack)):
print("Invalid choice")
continue
break
if choice is not None:
self.skip_stack = stack
self.skip_num = num
def before_cli(self, cli):
""" Wait for ENTER before executing CLI """
if self.skip():
print("Skip pause before executing CLI: %s" % cli)
else:
print(double_line_delim)
print("Test paused before executing CLI: %s" % cli)
print(single_line_delim)
self.user_input()
super(StepHook, self).before_cli(cli)
def before_api(self, api_name, api_args):
""" Wait for ENTER before executing API """
if self.skip():
print("Skip pause before executing API: %s (%s)"
% (api_name, api_args))
else:
print(double_line_delim)
print("Test paused before executing API: %s (%s)"
% (api_name, api_args))
print(single_line_delim)
self.user_input()
super(StepHook, self).before_api(api_name, api_args)
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