"""logtest, a unittest.TestCase helper for testing log output."""
import sys
import time
try:
# On Windows, msvcrt.getch reads a single char without output.
import msvcrt
def getchar():
return msvcrt.getch()
except ImportError:
# Unix getchr
import tty, termios
def getchar():
fd = sys.stdin.fileno()
old_settings = termios.tcgetattr(fd)
try:
tty.setraw(sys.stdin.fileno())
ch = sys.stdin.read(1)
finally:
termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
return ch
class LogCase(object):
"""unittest.TestCase mixin for testing log messages.
logfile: a filename for the desired log. Yes, I know modes are evil,
but it makes the test functions so much cleaner to set this once.
lastmarker: the last marker in the log. This can be used to search for
messages since the last marker.
markerPrefix: a string with which to prefix log markers. This should be
unique enough from normal log output to use for marker identification.
"""
logfile = None
lastmarker = None
markerPrefix = "test suite marker: "
def _handleLogError(self, msg, data, marker, pattern):
print
print " ERROR:", msg
if not self.interactive:
raise self.failureException(msg)
p = " Show: [L]og [M]arker [P]attern; [I]gnore, [R]aise, or sys.e[X]it >> "
print p,
while True:
i = getchar().upper()
if i not in "MPLIRX":
continue
print i.upper() # Also prints new line
if i == "L":
for x, line in enumerate(data):
if (x + 1) % self.console_height == 0:
# The \r and comma should make the next line overwrite
print "<-- More -->\r",
m = getchar().lower()
# Erase our "More" prompt
print " \r",
if m == "q":
break
print line.rstrip()
elif i == "M":
print repr(marker or self.lastmarker)
elif i == "P":
print repr(pattern)
elif i == "I":
# return without raising the normal exception
return
elif i == "R":
raise self.failureException(msg)
elif i == "X":
self.exit()
print p,
def exit(self):
sys.exit()
def emptyLog(self):
"""Overwrite self.logfile with 0 bytes."""
open(self.logfile, 'wb').write("")
def markLog(self, key=None):
"""Insert a marker line into the log and set self.lastmarker."""
if key is None:
key = str(time.time())
self.lastmarker = key
open(self.logfile, 'ab+').write("%s%s\n" % (self.markerPrefix, key))
def _read_marked_region(self, marker=None):
"""Return lines from self.logfile in the marked region.
If marker is None, self.lastmarker is used. If the log hasn't
been marked (using self.markLog), the entire log will be returned.
"""
## # Give the logger time to finish writing?
## time.sleep(0.5)
logfile = self.logfile
marker = marker or self.lastmarker
if marker is None:
return open(logfile, 'rb').readlines()
data = []
in_region = False
for line in open(logfile, 'rb'):
if in_region:
if (line.startswith(self.markerPrefix) and not marker in line):
break
else:
data.append(line)
elif marker in line:
in_region = True
return data
def assertInLog(self, line, marker=None):
"""Fail if the given (partial) line is not in the log.
The log will be searched from the given marker to the next marker.
If marker is None, self.lastmarker is used. If the log hasn't
been marked (using self.markLog), the entire log will be searched.
"""
data = self._read_marked_region(marker)
for logline in data:
if line in logline:
return
msg = "%r not found in log" % line
self._handleLogError(msg, data, marker, line)
def assertNotInLog(self, line, marker=None):
"""Fail if the given (partial) line is in the log.
The log will be searched from the given marker to the next marker.
If marker is None, self.lastmarker is used. If the log hasn't
been marked (using self.markLog), the entire log will be searched.
"""
data = self._read_marked_region(marker)
for logline in data:
if line in logline:
msg = "%r found in log" % line
self._handleLogError(msg, data, marker, line)
def assertLog(self, sliceargs, lines, marker=None):
"""Fail if log.readlines()[sliceargs] is not contained in 'lines'.
The log will be searched from the given marker to the next marker.
If marker is None, self.lastmarker is used. If the log hasn't
been marked (using self.markLog), the entire log will be searched.
"""
data = self._read_marked_region(marker)
if isinstance(sliceargs, int):
# Single arg. Use __getitem__ and allow lines to be str or list.
if isinstance(lines, (tuple, list)):
lines = lines[0]
if lines not in data[sliceargs]:
msg = "%r not found on log line %r" % (lines, sliceargs)
self._handleLogError(msg, [data[sliceargs]], marker, lines)
else:
# Multiple args. Use __getslice__ and require lines to be list.
if isinstance(lines, tuple):
lines = list(lines)
elif isinstance(lines, basestring):
raise TypeError("The 'lines' arg must be a list when "
"'sliceargs' is a tuple.")
start, stop = sliceargs
for line, logline in zip(lines, data[start:stop]):
if line not in logline:
msg = "%r not found in log" % line
self._handleLogError(msg, data[start:stop], marker, line)
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