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How to use lookup_lastlines method in autotest

Best Python code snippet using autotest_python

monitors_util.py

Source:monitors_util.py

...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.read()133    lastlines_file.close()134    os.remove(lastlines_file.name)135    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.read()143    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 pipe.read()168    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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