# Copyright 2001-2013 by Vinay Sajip. All Rights Reserved.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose and without fee is hereby granted,
# provided that the above copyright notice appear in all copies and that
# both that copyright notice and this permission notice appear in
# supporting documentation, and that the name of Vinay Sajip
# not be used in advertising or publicity pertaining to distribution
# of the software without specific, written prior permission.
# VINAY SAJIP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
# VINAY SAJIP BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
# IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""
Configuration functions for the logging package for Python. The core package
is based on PEP 282 and comments thereto in comp.lang.python, and influenced
by Apache's log4j system.

Copyright (C) 2001-2013 Vinay Sajip. All Rights Reserved.

To use, simply 'import logging' and log away!
"""

import sys, logging, logging.handlers, socket, struct, traceback, re
import io

try:
    import _thread as thread
    import threading
except ImportError: #pragma: no cover
    thread = None

from socketserver import ThreadingTCPServer, StreamRequestHandler


DEFAULT_LOGGING_CONFIG_PORT = 9030

if sys.platform == "win32":
    RESET_ERROR = 10054   #WSAECONNRESET
else:
    RESET_ERROR = 104     #ECONNRESET

#
#   The following code implements a socket listener for on-the-fly
#   reconfiguration of logging.
#
#   _listener holds the server object doing the listening
_listener = None

def fileConfig(fname, defaults=None, disable_existing_loggers=True):
    """
    Read the logging configuration from a ConfigParser-format file.

    This can be called several times from an application, allowing an end user
    the ability to select from various pre-canned configurations (if the
    developer provides a mechanism to present the choices and load the chosen
    configuration).
    """
    import configparser

    if isinstance(fname, configparser.RawConfigParser):
        cp = fname
    else:
        cp = configparser.ConfigParser(defaults)
        if hasattr(fname, 'readline'):
            cp.read_file(fname)
        else:
            cp.read(fname)

    formatters = _create_formatters(cp)

    # critical section
    logging._acquireLock()
    try:
        logging._handlers.clear()
        del logging._handlerList[:]
        # Handlers add themselves to logging._handlers
        handlers = _install_handlers(cp, formatters)
        _install_loggers(cp, handlers, disable_existing_loggers)
    finally:
        logging._releaseLock()


def _resolve(name):
    """Resolve a dotted name to a global object."""
    name = name.split('.')
    used = name.pop(0)
    found = __import__(used)
    for n in name:
        used = used + '.' + n
        try:
            found = getattr(found, n)
        except AttributeError:
            __import__(used)
            found = getattr(found, n)
    return found

def _strip_spaces(alist):
    return map(lambda x: x.strip(), alist)

def _create_formatters(cp):
    """Create and return formatters"""
    flist = cp["formatters"]["keys"]
    if not len(flist):
        return {}
    flist = flist.split(",")
    flist = _strip_spaces(flist)
    formatters = {}
    for form in flist:
        sectname = "formatter_%s" % form
        fs = cp.get(sectname, "format", raw=True, fallback=None)
        dfs = cp.get(sectname, "datefmt", raw=True, fallback=None)
        c = logging.Formatter
        class_name = cp[sectname].get("class")
        if class_name:
            c = _resolve(class_name)
        f = c(fs, dfs)
        formatters[form] = f
    return formatters


def _install_handlers(cp, formatters):
    """Install and return handlers"""
    hlist = cp["handlers"]["keys"]
    if not len(hlist):
        return {}
    hlist = hlist.split(",")
    hlist = _strip_spaces(hlist)
    handlers = {}
    fixups = [] #for inter-handler references
    for hand in hlist:
        section = cp["handler_%s" % hand]
        klass = section["class"]
        fmt = section.get("formatter", "")
        try:
            klass = eval(klass, vars(logging))
        except (AttributeError, NameError):
            klass = _resolve(klass)
        args = section["args"]
        args = eval(args, vars(logging))
        h = klass(*args)
        if "level" in section:
            level = section["level"]
            h.setLevel(level)
        if len(fmt):
            h.setFormatter(formatters[fmt])
        if issubclass(klass, logging.handlers.MemoryHandler):
            target = section.get("target", "")
            if len(target): #the target handler may not be loaded yet, so keep for later...
                fixups.append((h, target))
        handlers[hand] = h
    #now all handlers are loaded, fixup inter-handler references...
    for h, t in fixups:
        h.setTarget(handlers[t])
    return handlers

def _handle_existing_loggers(existing, child_loggers, disable_existing):
    """
    When (re)configuring logging, handle loggers which were in the previous
    configuration but are not in the new configuration. There's no point
    deleting them as other threads may continue to hold references to them;
    and by disabling them, you stop them doing any logging.

    However, don't disable children of named loggers, as that's probably not
    what was intended by the user. Also, allow existing loggers to NOT be
    disabled if disable_existing is false.
    """
    root = logging.root
    for log in existing:
        logger = root.manager.loggerDict[log]
        if log in child_loggers:
            logger.level = logging.NOTSET
            logger.handlers = []
            logger.propagate = True
        else:
            logger.disabled = disable_existing

def _install_loggers(cp, handlers, disable_existing):
    """Create and install loggers"""

    # configure the root first
    llist = cp["loggers"]["keys"]
    llist = llist.split(",")
    llist = list(map(lambda x: x.strip(), llist))
    llist.remove("root")
    section = cp["logger_root"]
    root = logging.root
    log = root
    if "level" in section:
        level = section["level"]
        log.setLevel(level)
    for h in root.handlers[:]:
        root.removeHandler(h)
    hlist = section["handlers"]
    if len(hlist):
        hlist = hlist.split(",")
        hlist = _strip_spaces(hlist)
        for hand in hlist:
            log.addHandler(handlers[hand])

    #and now the others...
    #we don't want to lose the existing loggers,
    #since other threads may have pointers to them.
    #existing is set to contain all existing loggers,
    #and as we go through the new configuration we
    #remove any which are configured. At the end,
    #what's left in existing is the set of loggers
    #which were in the previous configuration but
    #which are not in the new configuration.
    existing = list(root.manager.loggerDict.keys())
    #The list needs to be sorted so that we can
    #avoid disabling child loggers of explicitly
    #named loggers. With a sorted list it is easier
    #to find the child loggers.
    existing.sort()
    #We'll keep the list of existing loggers
    #which are children of named loggers here...
    child_loggers = []
    #now set up the new ones...
    for log in llist:
        section = cp["logger_%s" % log]
        qn = section["qualname"]
        propagate = section.getint("propagate", fallback=1)
        logger = logging.getLogger(qn)
        if qn in existing:
            i = existing.index(qn) + 1 # start with the entry after qn
            prefixed = qn + "."
            pflen = len(prefixed)
            num_existing = len(existing)
            while i < num_existing:
                if existing[i][:pflen] == prefixed:
                    child_loggers.append(existing[i])
                i += 1
            existing.remove(qn)
        if "level" in section:
            level = section["level"]
            logger.setLevel(level)
        for h in logger.handlers[:]:
            logger.removeHandler(h)
        logger.propagate = propagate
        logger.disabled = 0
        hlist = section["handlers"]
        if len(hlist):
            hlist = hlist.split(",")
            hlist = _strip_spaces(hlist)
            for hand in hlist:
                logger.addHandler(handlers[hand])

    #Disable any old loggers. There's no point deleting
    #them as other threads may continue to hold references
    #and by disabling them, you stop them doing any logging.
    #However, don't disable children of named loggers, as that's
    #probably not what was intended by the user.
    #for log in existing:
    #    logger = root.manager.loggerDict[log]
    #    if log in child_loggers:
    #        logger.level = logging.NOTSET
    #        logger.handlers = []
    #        logger.propagate = 1
    #    elif disable_existing_loggers:
    #        logger.disabled = 1
    _handle_existing_loggers(existing, child_loggers, disable_existing)

IDENTIFIER = re.compile('^[a-z_][a-z0-9_]*$', re.I)


def valid_ident(s):
    m = IDENTIFIER.match(s)
    if not m:
        raise ValueError('Not a valid Python identifier: %r' % s)
    return True


# The ConvertingXXX classes are wrappers around standard Python containers,
# and they serve to convert any suitable values in the container. The
# conversion converts base dicts, lists and tuples to their wrapped
# equivalents, whereas strings which match a conversion format are converted
# appropriately.
#
# Each wrapper should have a configurator attribute holding the actual
# configurator to use for conversion.

class ConvertingDict(dict):
    """A converting dictionary wrapper."""

    def __getitem__(self, key):
        value = dict.__getitem__(self, key)
        result = self.configurator.convert(value)
        #If the converted value is different, save for next time
        if value is not result:
            self[key] = result
            if type(result) in (ConvertingDict, ConvertingList,
                                ConvertingTuple):
                result.parent = self
                result.key = key
        return result

    def get(self, key, default=None):
        value = dict.get(self, key, default)
        result = self.configurator.convert(value)
        #If the converted value is different, save for next time
        if value is not result:
            self[key] = result
            if type(result) in (ConvertingDict, ConvertingList,