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# Copyright (C) 2011-2012 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import imp
import os
import re
import select
import subprocess
import sys
import time
class Timeout(Exception):
def __str__(self):
buf, regexp = self.args
return 'Cannot find %s in %s' % (repr(regexp), repr(buf))
class System(object):
'''Abstract interface to a system.
The interface allows starting and stopping the system, and interacting
with its via a serial console.
'''
def start(self):
'''Start the system.'''
raise NotImplementedError()
def stop(self):
'''Stop the system.'''
raise NotImplementedError()
def waitfor(self, regexp, timeout):
'''Wait system to output a match for ``regexp`` on the serial console.
If timeout is exceeded, raise Timeout.
'''
raise NotImplementedError()
def send(self, text):
'''Send TEXT via the serial console to the system.'''
raise NotImplementedError()
class KvmSystem(System):
'''A system running under KVM.'''
def __init__(self, image_filename, verbose=False, timeout=None):
self.image_filename = image_filename
self.verbose = verbose
self.timeout = timeout
self.p = None
self.stdin_buf = ''
self.stdout_buf = ''
def start(self):
self.p = subprocess.Popen(['kvm', '-nographic', self.image_filename],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
def stop(self):
self.p.terminate()
self.p.wait()
def _io(self, timeout):
r, w, x = select.select([self.p.stdout], [self.p.stdin], [], timeout)
if self.p.stdout in r:
byte = self.p.stdout.read(1)
if byte:
if self.verbose:
sys.stdout.write(byte)
sys.stdout.flush()
self.stdout_buf += byte
elif self.p.stdin in w:
if self.stdin_buf:
byte = self.stdin_buf[0]
self.p.stdin.write(byte)
self.p.stdin.flush()
self.stdin_buf = self.stdin_buf[1:]
else:
if self.verbose:
sys.stdout.write('_')
sys.stdout.flush()
def waitfor(self, regexp, timeout=None):
pat = re.compile(regexp, re.DOTALL | re.MULTILINE)
started = time.time()
timeout = timeout if timeout is not None else self.timeout
remaining = timeout
while not pat.search(self.stdout_buf) and remaining > 0:
self._io(remaining)
remaining = (started + timeout) - time.time()
m = pat.search(self.stdout_buf)
if not m:
raise Timeout(self.stdout_buf, regexp)
self.stdout_buf = self.stdout_buf[m.end():]
def send(self, text):
self.stdin_buf += text
class TestStory(object):
'''Execute a test story.'''
def __init__(self, system, steps, msg):
self.system = system
self.steps = steps
self.msg = msg
def run(self):
self.system.start()
for t in self.steps:
if len(t) == 2:
send, expect = t
timeout = None
else:
assert len(t) == 3
send, expect, timeout = t
self.msg('Sending: %s' % repr(send))
self.msg('Expecting: %s' % repr(expect))
self.system.send(send)
self.system.waitfor(expect, timeout=timeout)
self.system.stop()
def load_module(filename):
for t in imp.get_suffixes():
suffix, mode, kind = t
if filename.endswith(suffix):
module_name = os.path.basename(filename[:-len(suffix)])
with open(filename, mode) as f:
return imp.load_module(module_name, f, filename, t)
raise Exception("Unknown module: %s" % filename)
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