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imh-python
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cherrypy
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Filename :
logtest.py
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"""logtest, a unittest.TestCase helper for testing log output.""" import sys import time from uuid import UUID import pytest from cherrypy._cpcompat import text_or_bytes try: # On Windows, msvcrt.getch reads a single char without output. import msvcrt def getchar(): return msvcrt.getch() except ImportError: # Unix getchr import tty import 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. """ interactive = False logfile = None lastmarker = None markerPrefix = b'test suite marker: ' def _handleLogError(self, msg, data, marker, pattern): print('') print(' ERROR: %s' % msg) if not self.interactive: raise pytest.fail(msg) p = (' Show: ' '[L]og [M]arker [P]attern; ' '[I]gnore, [R]aise, or sys.e[X]it >> ') sys.stdout.write(p + ' ') # ARGH sys.stdout.flush() 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 sys.stdout.write('<-- More -->\r ') m = getchar().lower() # Erase our "More" prompt sys.stdout.write(' \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 pytest.fail(msg) elif i == 'X': self.exit() sys.stdout.write(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( b'%s%s\n' % (self.markerPrefix, key.encode('utf-8')) ) 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() if isinstance(marker, str): marker = marker.encode('utf-8') data = [] in_region = False for line in open(logfile, 'rb'): if in_region: if line.startswith(self.markerPrefix) and marker not 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 assertValidUUIDv4(self, marker=None): """Fail if the given UUIDv4 is not valid. 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) data = [ chunk.decode('utf-8').rstrip('\n').rstrip('\r') for chunk in data ] for log_chunk in data: try: uuid_log = data[-1] uuid_obj = UUID(uuid_log, version=4) except (TypeError, ValueError): pass # it might be in other chunk else: if str(uuid_obj) == uuid_log: return msg = '%r is not a valid UUIDv4' % uuid_log self._handleLogError(msg, data, marker, log_chunk) msg = 'UUIDv4 not found in log' self._handleLogError(msg, data, marker, log_chunk) 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 isinstance(lines, str): lines = lines.encode('utf-8') if lines not in data[sliceargs]: msg = '%r not found on log line %r' % (lines, sliceargs) self._handleLogError( msg, [data[sliceargs], '--EXTRA CONTEXT--'] + data[ sliceargs + 1:sliceargs + 6], marker, lines) else: # Multiple args. Use __getslice__ and require lines to be list. if isinstance(lines, tuple): lines = list(lines) elif isinstance(lines, text_or_bytes): 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 isinstance(line, str): line = line.encode('utf-8') if line not in logline: msg = '%r not found in log' % line self._handleLogError(msg, data[start:stop], marker, line)