How to use lookup_lastlines method in autotest

Best Python code snippet using autotest_python Github


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...111 for regex, callback in alert_hooks:112 match = re.match(regex, line.strip())113 if match:114 callback(*match.groups())115def lookup_lastlines(lastlines_dirpath, path):116 """Retrieve last lines seen for path.117 Open corresponding lastline file for path118 If there isn't one or isn't a match return None119 Args:120 lastlines_dirpath: str; Dirpath to store lastlines files to.121 path: str; Filepath to source file that lastlines came from.122 Returns:123 str; Last lines seen if they exist124 - Or -125 None; Otherwise126 """127 underscored = path.replace('/', '_')128 try:129 lastlines_file = open(os.path.join(lastlines_dirpath, underscored))130 except (OSError, IOError):131 return132 lastlines = lastlines_file.close()134 os.remove( if not lastlines:136 return137 try:138 target_file = open(path)139 except (OSError, IOError):140 return141 # Load it all in for now142 target_data = target_file.close()144 # Get start loc in the target_data string, scanning from right145 loc = target_data.rfind(lastlines)146 if loc == -1:147 return148 # Then translate this into a reverse line number149 # (count newlines that occur afterward)150 reverse_lineno = target_data.count('\n', loc + len(lastlines))151 return reverse_lineno152def write_lastlines_file(lastlines_dirpath, path, data):153 """Write data to lastlines file for path.154 Args:155 lastlines_dirpath: str; Dirpath to store lastlines files to.156 path: str; Filepath to source file that data comes from.157 data: str;158 Returns:159 str; Filepath that lastline data was written to.160 """161 underscored = path.replace('/', '_')162 dest_path = os.path.join(lastlines_dirpath, underscored)163 open(dest_path, 'w').write(data)164 return dest_path165def nonblocking(pipe):166 """Set python file object to nonblocking mode.167 This allows us to take advantage of where we don't have to specify a buflen.169 Cuts down on a few lines we'd have to maintain.170 Args:171 pipe: file; File object to modify172 Returns: pipe173 """174 flags = fcntl.fcntl(pipe, fcntl.F_GETFL)175 fcntl.fcntl(pipe, fcntl.F_SETFL, flags| os.O_NONBLOCK)176 return pipe177def launch_tails(follow_paths, lastlines_dirpath=None):178 """Launch a tail process for each follow_path.179 Args:180 follow_paths: list;181 lastlines_dirpath: str;182 Returns:183 tuple; (procs, pipes) or184 ({path: subprocess.Popen, ...}, {file: path, ...})185 """186 if lastlines_dirpath and not os.path.exists(lastlines_dirpath):187 os.makedirs(lastlines_dirpath)188 tail_cmd = ('/usr/bin/tail', '--retry', '--follow=name')189 procs = {} # path -> tail_proc190 pipes = {} # tail_proc.stdout -> path191 for path in follow_paths:192 cmd = list(tail_cmd)193 if lastlines_dirpath:194 reverse_lineno = lookup_lastlines(lastlines_dirpath, path)195 if reverse_lineno is None:196 reverse_lineno = 1197 cmd.append('--lines=%d' % reverse_lineno)198 cmd.append(path)199 tail_proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)200 procs[path] = tail_proc201 pipes[nonblocking(tail_proc.stdout)] = path202 return procs, pipes203def poll_tail_pipes(pipes, lastlines_dirpath=None, waitsecs=5):204 """Wait on tail pipes for new data for waitsecs, return any new lines.205 Args:206 pipes: dict; {subprocess.Popen: follow_path, ...}207 lastlines_dirpath: str; Path to write lastlines to.208 waitsecs: int; Timeout to pass to select...

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