~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Messages and logging for bazaar-ng.

Messages are supplied by callers as a string-formatting template, plus values

to be inserted into it.  The actual %-formatting is deferred to the log

library so that it doesn't need to be done for messages that won't be emitted.

Messages are classified by severity levels: critical, error, warning, info,

and debug.

They can be sent to two places: to stderr, and to ~/.bzr.log.  For purposes

such as running the test suite, they can also be redirected away from both of

those two places to another location.

~/.bzr.log gets all messages, and full tracebacks for uncaught exceptions.

This trace file is always in UTF-8, regardless of the user's default encoding,

so that we can always rely on writing any message.

Output to stderr depends on the mode chosen by the user.  By default, messages

of info and above are sent out, which results in progress messages such as the

list of files processed by add and commit.  In quiet mode, only warnings and

above are shown.  In debug mode, stderr gets debug messages too.

Errors that terminate an operation are generally passed back as exceptions;

others may be just emitted as messages.

Exceptions are reported in a brief form to stderr so as not to look scary.

BzrErrors are required to be able to format themselves into a properly

explanatory message.  This is not true for builtin exceptions such as

KeyError, which typically just str to "0".  They're printed in a different

form.

"""

# FIXME: Unfortunately it turns out that python's logging module

# is quite expensive, even when the message is not printed by any handlers.

# We should perhaps change back to just simply doing it here.

import os

import sys

import re

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

from cStringIO import StringIO

import errno

import logging

import traceback

""")

import bzrlib

lazy_import(globals(), """

from bzrlib import debug

""")

_file_handler = None

_stderr_handler = None

_stderr_quiet = False

_trace_file = None

_trace_depth = 0

_bzr_log_file = None

_bzr_log_filename = None

# configure convenient aliases for output routines

_bzr_logger = logging.getLogger('bzr')

def note(*args, **kwargs):

    # FIXME note always emits utf-8, regardless of the terminal encoding

    import bzrlib.ui

    bzrlib.ui.ui_factory.clear_term()

    _bzr_logger.info(*args, **kwargs)

def warning(*args, **kwargs):

    import bzrlib.ui

    bzrlib.ui.ui_factory.clear_term()

    _bzr_logger.warning(*args, **kwargs)

info = note

log_error = _bzr_logger.error

error =     _bzr_logger.error

def mutter(fmt, *args):

    if _trace_file is None:

        return

    if (getattr(_trace_file, 'closed', None) is not None) and _trace_file.closed:

        return

    if isinstance(fmt, unicode):

        fmt = fmt.encode('utf8')

    if len(args) > 0:

        # It seems that if we do ascii % (unicode, ascii) we can

        # get a unicode cannot encode ascii error, so make sure that "fmt"

        # is a unicode string

        real_args = []

        for arg in args:

            if isinstance(arg, unicode):

                arg = arg.encode('utf8')

            real_args.append(arg)

        out = fmt % tuple(real_args)

    else:

        out = fmt

    out += '\n'

    _trace_file.write(out)

    # TODO: jam 20051227 Consider flushing the trace file to help debugging

    #_trace_file.flush()

def mutter_callsite(stacklevel, fmt, *args):

    """Perform a mutter of fmt and args, logging the call trace.

    :param stacklevel: The number of frames to show. None will show all

        frames.

    :param fmt: The format string to pass to mutter.

    :param args: A list of substitution variables.

    """

    outf = StringIO()

    traceback.print_stack(limit=stacklevel + 1, file=outf)

    formatted_lines = outf.getvalue().splitlines()

    formatted_stack = '\n'.join(formatted_lines[:-2])

    mutter(fmt + "\nCalled from:\n%s", *(args + (formatted_stack,)))

def _rollover_trace_maybe(trace_fname):

    import stat

    try:

        size = os.stat(trace_fname)[stat.ST_SIZE]

        if size <= 4 << 20:

            return

        old_fname = trace_fname + '.old'

        from osutils import rename

        rename(trace_fname, old_fname)

    except OSError:

        return

def open_tracefile(tracefilename=None):

    # Messages are always written to here, so that we have some

    # information if something goes wrong.  In a future version this

    # file will be removed on successful completion.

    global _file_handler, _bzr_log_file, _bzr_log_filename

    import codecs

    if tracefilename is None:

        if sys.platform == 'win32':

            from bzrlib import win32utils

            home = win32utils.get_home_location()

        else:

            home = os.path.expanduser('~')

        _bzr_log_filename = os.path.join(home, '.bzr.log')

    else:

        _bzr_log_filename = tracefilename

    _bzr_log_filename = os.path.expanduser(_bzr_log_filename)

    _rollover_trace_maybe(_bzr_log_filename)

    try:

        LINE_BUFFERED = 1

        #tf = codecs.open(trace_fname, 'at', 'utf8', buffering=LINE_BUFFERED)

        tf = open(_bzr_log_filename, 'at', LINE_BUFFERED)

        _bzr_log_file = tf

        # tf.tell() on windows always return 0 until some writing done

        tf.write('\n')

        if tf.tell() <= 2:

            tf.write("this is a debug log for diagnosing/reporting problems in bzr\n")

            tf.write("you can delete or truncate this file, or include sections in\n")

            tf.write("bug reports to bazaar@lists.canonical.com\n\n")

        _file_handler = logging.StreamHandler(tf)

        fmt = r'[%(process)5d] %(asctime)s.%(msecs)03d %(levelname)s: %(message)s'

        datefmt = r'%a %H:%M:%S'

        _file_handler.setFormatter(logging.Formatter(fmt, datefmt))

        _file_handler.setLevel(logging.DEBUG)

        logging.getLogger('').addHandler(_file_handler)

    except IOError, e:

        warning("failed to open trace file: %s" % (e))

def log_exception_quietly():

    """Log the last exception to the trace file only.

    Used for exceptions that occur internally and that may be 

    interesting to developers but not to users.  For example, 

    errors loading plugins.

    """

    import traceback

    mutter(traceback.format_exc())

def enable_default_logging():

    """Configure default logging to stderr and .bzr.log"""

    # FIXME: if this is run twice, things get confused

    global _stderr_handler, _file_handler, _trace_file, _bzr_log_file

    _stderr_handler = logging.StreamHandler()

    logging.getLogger('').addHandler(_stderr_handler)

    _stderr_handler.setLevel(logging.INFO)

    if not _file_handler:

        open_tracefile()

    _trace_file = _bzr_log_file

    if _file_handler:

        _file_handler.setLevel(logging.DEBUG)

    _bzr_logger.setLevel(logging.DEBUG)

def be_quiet(quiet=True):

    global _stderr_handler, _stderr_quiet

    _stderr_quiet = quiet

    if quiet:

        _stderr_handler.setLevel(logging.WARNING)

    else:

        _stderr_handler.setLevel(logging.INFO)

def is_quiet():

    global _stderr_quiet

    return _stderr_quiet

def disable_default_logging():

    """Turn off default log handlers.

    This is intended to be used by the test framework, which doesn't

    want leakage from the code-under-test into the main logs.

    """

    l = logging.getLogger('')

    l.removeHandler(_stderr_handler)

    if _file_handler:

        l.removeHandler(_file_handler)

    _trace_file = None

def enable_test_log(to_file):

    """Redirect logging to a temporary file for a test

    returns an opaque reference that should be passed to disable_test_log

    after the test completes.

    """

    disable_default_logging()

    global _trace_file

    global _trace_depth

    hdlr = logging.StreamHandler(to_file)

    hdlr.setLevel(logging.DEBUG)

    hdlr.setFormatter(logging.Formatter('%(levelname)8s  %(message)s'))

    _bzr_logger.addHandler(hdlr)

    _bzr_logger.setLevel(logging.DEBUG)

    result = hdlr, _trace_file, _trace_depth

    _trace_file = to_file

    _trace_depth += 1

    return result

def disable_test_log((test_log_hdlr, old_trace_file, old_trace_depth)):

    _bzr_logger.removeHandler(test_log_hdlr)

    test_log_hdlr.close()

    global _trace_file

    global _trace_depth

    _trace_file = old_trace_file

    _trace_depth = old_trace_depth

    if not _trace_depth:

        enable_default_logging()

def report_exception(exc_info, err_file):

    exc_type, exc_object, exc_tb = exc_info

    # Log the full traceback to ~/.bzr.log

    log_exception_quietly()

    if (isinstance(exc_object, IOError)

        and getattr(exc_object, 'errno', None) == errno.EPIPE):

        print >>err_file, "bzr: broken pipe"

    elif isinstance(exc_object, KeyboardInterrupt):

        print >>err_file, "bzr: interrupted"

    elif not getattr(exc_object, 'internal_error', True):

        report_user_error(exc_info, err_file)

    elif isinstance(exc_object, (OSError, IOError)):

        # Might be nice to catch all of these and show them as something more

        # specific, but there are too many cases at the moment.

        report_user_error(exc_info, err_file)

    else:

        report_bug(exc_info, err_file)

# TODO: Should these be specially encoding the output?

def report_user_error(exc_info, err_file):

    """Report to err_file an error that's not an internal error.

    These don't get a traceback unless -Derror was given.

    """

    if 'error' in debug.debug_flags:

        report_bug(exc_info, err_file)

        return

    print >>err_file, "bzr: ERROR:", str(exc_info[1])

def report_bug(exc_info, err_file):

    """Report an exception that probably indicates a bug in bzr"""

    import traceback

    exc_type, exc_object, exc_tb = exc_info

    print >>err_file, "bzr: ERROR: %s.%s: %s" % (

        exc_type.__module__, exc_type.__name__, exc_object)

    print >>err_file

    traceback.print_exception(exc_type, exc_object, exc_tb, file=err_file)

    print >>err_file

    print >>err_file, 'bzr %s on python %s (%s)' % \

                       (bzrlib.__version__,

                        '.'.join(map(str, sys.version_info)),

                        sys.platform)

    print >>err_file, 'arguments: %r' % sys.argv

    print >>err_file

    print >>err_file, "** please send this report to bazaar@lists.ubuntu.com"