Synnefo

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"""

This is the logging class for burnin

It supports logging both for the stdout/stderr as well as file logging at the

same time.

The stdout/stderr logger supports verbose levels and colors but the file

logging doesn't (we use the info verbose level for our file logger).

Our loggers have primitive support for handling parallel execution (even though

burnin doesn't support it yet). To do so the stdout/stderr logger prepends the

name of the test under execution to every line it prints. On the other hand the

file logger waits to lock the file, then reads it, prints the message to the

corresponding line and closes the file.

"""

import os

import sys

import os.path

import datetime

from synnefo_tools.burnin import filelocker

# --------------------------------------------------------------------

# Constant variables

LOCK_EXT = ".lock"

SECTION_SEPARATOR = \

    "-- -------------------------------------------------------------------"

SECTION_PREFIX = "-- "

SECTION_RUNNED = "Tests Runned"

SECTION_RESULTS = "Results"

SECTION_NEW = "__ADD_NEW_SECTION__"

SECTION_PASSED = "  * Passed:"

SECTION_FAILED = "  * Failed:"

# --------------------------------------------------------------------

# Helper functions

def _blue(msg):

    """Blue color"""

    return "\x1b[1;34m" + str(msg) + "\x1b[0m"

def _yellow(msg):

    """Yellow color"""

    return "\x1b[33m" + str(msg) + "\x1b[0m"

def _red(msg):

    """Yellow color"""

    return "\x1b[31m" + str(msg) + "\x1b[0m"

def _magenta(msg):

    """Magenta color"""

    return "\x1b[35m" + str(msg) + "\x1b[0m"

def _green(msg):

    """Green color"""

    return "\x1b[32m" + str(msg) + "\x1b[0m"

def _format_message(msg, *args):

    """Format the message using the args"""

    if args:

        return (msg % args) + "\n"

    else:

        return msg + "\n"

def _list_to_string(lst, append=""):

    """Convert a list of strings to string

    Append the value given in L{append} in front of all lines

    (except of the first line).

    """

    if isinstance(lst, list):

        return append.join(lst).rstrip('\n')

    else:

        return lst.rstrip('\n')

# --------------------------------------

def _locate_sections(contents):

    """Locate the sections inside the logging file"""

    i = 0

    res = []

    for cnt in contents:

        if SECTION_SEPARATOR in cnt:

            res.append(i+1)

        i += 1

    return res

def _locate_input(contents, section):

    """Locate position to insert text

    Given a section location the next possition to insert text inside that

    section.

    """

    sect_locs = _locate_sections(contents)

    if section == SECTION_NEW:

        # We want to add a new section

        # Just return the position of SECTION_RESULTS

        for obj in sect_locs:

            if SECTION_RESULTS in contents[obj]:

                return obj - 1

    else:

        # We will add our message in this location

        for (index, obj) in enumerate(sect_locs):

            if section in contents[obj]:

                return sect_locs[index+1] - 3

    # We didn't find our section??

    sys.stderr.write("Section %s could not be found in logging file\n"

                     % section)

    sys.exit("Error in logger._locate_input")

def _add_testsuite_results(contents, section, testsuite):

    """Add the given testsuite to results

    Well we know that SECTION_FAILED is the last line and SECTION_PASSED is the

    line before, so we are going to cheat here and use this information.

    """

    if section == SECTION_PASSED:

        line = contents[-2]

        new_line = line.rstrip() + " " + testsuite + ",\n"

        contents[-2] = new_line

    elif section == SECTION_FAILED:

        line = contents[-1]

        new_line = line.rstrip() + " " + testsuite + ",\n"

        contents[-1] = new_line

    else:

        sys.stderr.write("Unknown section %s in _add_testsuite_results\n"

                         % section)

        sys.exit("Error in logger._add_testsuite_results")

    return contents

def _write_log_file(file_location, section, message):

    """Write something to our log file

    For this we have to get the lock, read and parse the file add the new

    message and re-write the file.

    """

    # Get the lock

    file_lock = os.path.splitext(file_location)[0] + LOCK_EXT

    with filelocker.lock(file_lock, filelocker.LOCK_EX):

        with open(file_location, "r+") as log_file:

            contents = log_file.readlines()

            if section == SECTION_PASSED or section == SECTION_FAILED:

                # Add testsuite to results

                new_contents = \

                    _add_testsuite_results(contents, section, message)

            else:

                # Add message to its line

                input_loc = _locate_input(contents, section)

                new_contents = \

                    contents[:input_loc] + [message] + contents[input_loc:]

            log_file.seek(0)

            log_file.write("".join(new_contents))

# --------------------------------------------------------------------

# The Log class

class Log(object):

    """Burnin logger

    """

    # ----------------------------------

    # Too many arguments. pylint: disable-msg=R0913

    def __init__(self, output_dir, verbose=1, use_colors=True,

                 in_parallel=False, log_level=0, curr_time=None):

        """Initialize our loggers

        The file to be used by our file logger will be created inside

        the L{output_dir} with name the current timestamp.

        @type output_dir: string

        @param output_dir: the directory to save the output file

        @type verbose: int

        @param verbose: the verbose level to use for stdout/stderr logger

            0: verbose at minimum level (only which test we are running now)

            1: verbose at info level (information about our running test)

            2: verbose at debug level

        @type use_colors: boolean

        @param use_colors: use colors for out stdout/stderr logger

        @type in_parallel: boolean

        @param in_parallel: this signifies that burnin is running in parallel

        @type log_level: int

        @param log_level: logging level

            0: log to console and file

            1: log to file only and output the results to console

            2: don't log

        @type curr_time: datetime.datetime()

        @param curr_time: The current time (used as burnin's run id)

        """

        self.verbose = verbose

        self.use_colors = use_colors

        self.in_parallel = in_parallel

        self.log_level = log_level

        assert output_dir

        if curr_time is None:

            curr_time = datetime.datetime.now()

        timestamp = datetime.datetime.strftime(

            curr_time, "%Y%m%d%H%M%S (%a %b %d %Y %H:%M)")

        file_name = timestamp + ".log"

        self.file_location = os.path.join(output_dir, file_name)

        self._write_to_stdout(None, "Starting burnin with id %s\n" % timestamp)

        # Create the logging file

        self._create_logging_file(timestamp, output_dir)

    def _create_logging_file(self, timestamp, output_dir):

        """Create the logging file"""

        if self.log_level > 1:

            return

        # Create file for logging

        output_dir = os.path.expanduser(output_dir)

        if not os.path.exists(output_dir):

            self.debug(None, "Creating directory %s", output_dir)

            try:

                os.makedirs(output_dir)

            except OSError as err:

                msg = ("Failed to create folder \"%s\" with error: %s\n"

                       % (output_dir, err))

                sys.stderr.write(msg)

                sys.exit("Failed to create log folder")

        self.debug(None, "Using \"%s\" file for logging", self.file_location)

        with open(self.file_location, 'w') as out_file:

            out_file.write(SECTION_SEPARATOR + "\n")

            out_file.write("%s%s with id %s:\n\n\n\n" %

                           (SECTION_PREFIX, SECTION_RUNNED, timestamp))

            out_file.write(SECTION_SEPARATOR + "\n")

            out_file.write("%s%s:\n\n" % (SECTION_PREFIX, SECTION_RESULTS))

            out_file.write(SECTION_PASSED + "\n" + SECTION_FAILED + "\n")

    def __del__(self):

        """Delete the Log object"""

        self.print_logfile_to_stdout()

        # Remove the lock file

        if hasattr(self, "file_location"):

            file_lock = os.path.splitext(self.file_location)[0] + LOCK_EXT

            try:

                os.remove(file_lock)

            except OSError:

                self.debug(None, "Couldn't delete lock file")

    def print_logfile_to_stdout(self):

        """Print the contents of our log file to stdout"""

        if self.log_level == 1:

            with open(self.file_location, 'r') as fin:

                sys.stdout.write(fin.read())

    # ----------------------------------

    # Logging methods

    def debug(self, section, msg, *args):

        """Debug messages (verbose 2)

        We show debug messages only to stdout. The message will be formatted

        using the args.

        """

        msg = "  (DD) " + _list_to_string(msg, append="       ")

        if self.verbose >= 2:

            colored_msg = self._color_message(None, msg, *args)

            self._write_to_stdout(section, colored_msg)

    def log(self, section, msg, *args):

        """Normal messages (verbose 0)"""

        assert section, "Section can not be empty"

        msg = _list_to_string(msg)

        colored_msg = self._color_message(None, msg, *args)

        self._write_to_stdout(section, colored_msg)

        plain_msg = _format_message(msg, *args)

        self._write_to_file(section, plain_msg)

    def info(self, section, msg, *args):

        """Info messages (verbose 1)

        Prepare message and write it to file logger and stdout logger

        """

        assert section, "Section can not be empty"

        msg = "  " + _list_to_string(msg, "  ")

        if self.verbose >= 1:

            colored_msg = self._color_message(None, msg, *args)

            self._write_to_stdout(section, colored_msg)

        plain_msg = _format_message(msg, *args)

        self._write_to_file(section, plain_msg)

    def warning(self, section, msg, *args):

        """Warning messages"""

        assert section, "Section can not be empty"

        msg = "  (WW) " + _list_to_string(msg, "       ")

        colored_msg = self._color_message(_yellow, msg, *args)

        self._write_to_stderr(section, colored_msg)

        plain_msg = _format_message(msg, *args)

        self._write_to_file(section, plain_msg)

    def error(self, section, msg, *args):

        """Error messages"""

        assert section, "Section can not be empty"

        msg = "  (EE) " + _list_to_string(msg, "       ")

        colored_msg = self._color_message(_red, msg, *args)

        self._write_to_stderr(section, colored_msg)

        plain_msg = _format_message(msg, *args)

        self._write_to_file(section, plain_msg)

    def _write_to_stdout(self, section, msg):

        """Write to stdout"""

        if self.log_level > 0:

            return

        if section is not None and self.in_parallel:

            sys.stdout.write(section + ": " + msg)

        else:

            sys.stdout.write(msg)

    def _write_to_stderr(self, section, msg):

        """Write to stderr"""

        if self.log_level > 0:

            return

        if section is not None and self.in_parallel:

            sys.stderr.write(section + ": " + msg)

        else:

            sys.stderr.write(msg)

    def _write_to_file(self, section, msg):

        """Write to file"""

        if self.log_level > 1:

            return

        _write_log_file(self.file_location, section, msg)

    # ----------------------------------

    # Handle testsuites

    def testsuite_start(self, testsuite):

        """Start a new testsuite

        Add a new section in the logging file

        """

        assert testsuite, "Testsuite name can not be emtpy"

        # Add a new section in the logging file

        test_runned = "  * " + testsuite + "\n"

        self._write_to_file(SECTION_RUNNED, test_runned)

        new_section_entry = \

            SECTION_SEPARATOR + "\n" + SECTION_PREFIX + testsuite + "\n\n\n\n"

        self._write_to_file(SECTION_NEW, new_section_entry)

        # Add new section to the stdout

        msg = "Starting testsuite %s" % testsuite

        colored_msg = self._color_message(_magenta, msg)

        self._write_to_stdout(None, colored_msg)

    def testsuite_success(self, testsuite):

        """A testsuite has successfully finished

        Update Results

        """

        assert testsuite, "Testsuite name can not be emtpy"

        # Add our testsuite to Results

        self._write_to_file(SECTION_PASSED, testsuite)

        # Add success to stdout

        msg = "Testsuite %s passed" % testsuite

        colored_msg = self._color_message(_green, msg)

        self._write_to_stdout(None, colored_msg)

    def testsuite_failure(self, testsuite):

        """A testsuite has failed

        Update Results

        """

        assert testsuite, "Testsuite name can not be emtpy"

        # Add our testsuite to Results

        self._write_to_file(SECTION_FAILED, testsuite)

        # Add success to stdout

        msg = "Testsuite %s failed" % testsuite

        colored_msg = self._color_message(_red, msg)

        self._write_to_stdout(None, colored_msg)

    # ----------------------------------

    # Colors

    def _color_message(self, color_fun, msg, *args):

        """Color a message before printing it

        The color_fun parameter is used when we want the whole message to be

        colored.

        """

        if self.use_colors:

            if callable(color_fun):

                if args:

                    return color_fun((msg % args)) + "\n"

                else:

                    return color_fun(msg) + "\n"

            else:

                args = tuple([_blue(arg) for arg in args])

                return _format_message(msg, *args)

        else:

            return _format_message(msg, *args)