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#!/usr/bin/env python

#
#    Copyright (C) 1999-2006  Keith Dart <keith@kdart.com>
#    Copyright (C) 2008-2009  Dan O'Reilly <oreilldf@gmail.com>
#
#    This library is free software; you can redistribute it and/or
#    modify it under the terms of the GNU Lesser General Public
#    License as published by the Free Software Foundation; either
#    version 2.1 of the License, or (at your option) any later version.
#
#    This library 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
#    Lesser General Public License for more details.

"""

Managing logfile rotation. A ManagedLog object is a file-like object that
rotates itself when a maximum size is reached.

"""

import sys
import os
import time

class SizeError(IOError):
    pass

class LogFile(file):
    """LogFile(name, [mode="w"], [maxsize=360000])
    
    Opens a new file object. After writing <maxsize> bytes a SizeError
    will be raised.
    
    """
    def __init__(self, name, mode="a", maxsize=360000):
        super(LogFile, self).__init__(name, mode)
        self.maxsize = maxsize
        self.eol = True
        try:
            self.written = os.fstat(self.fileno())[6]
        except OSError:
            self.written = 0

    def write(self, data):
        self.written += len(data)
        
        data = data.decode('utf-8').encode('utf-8')
        if len(data) <= 0: return
        if self.eol:
            super(LogFile, self).write(self.get_time() + ' :: ')
            self.eol = False

        if data[-1] == '\n':
            self.eol = True
            data = data[:-1]

        super(LogFile, self).write(data.replace(
                                    '\n', '\n' + self.get_time() + ' :: '))
        if self.eol:
            super(LogFile, self).write('\n')
            
        self.flush()
        if self.written > self.maxsize:
            raise SizeError
        
    def get_time(self):
        """ Return a string with the current time nicely formatted.

        The format of the returned string is yyyy/mm/dd HH:MM:SS

        """
        x = time.localtime()
        return ''.join([
            str(x[0]).rjust(4, '0'), '/', str(x[1]).rjust(2, '0'), '/',
            str(x[2]).rjust(2, '0'), ' ', str(x[3]).rjust(2, '0'), ':',
            str(x[4]).rjust(2, '0'), ':', str(x[5]).rjust(2, '0')])

    def rotate(self):
        return rotate(self)

    def note(self, text):
        """Writes a specially formated note text to the file.
        
        The note starts with the string '\\n#*=' so you can easily filter them.
        
        """
        self.write("\n#*===== %s =====\n" % (text,))


class ManagedLog(object):
    """ManagedLog(name, [maxsize=360000], [maxsave=9])
    
    A ManagedLog instance is a persistent log object. Write data with the
    write() method. The log size and rotation is handled automatically.

    """
    def __init__(self, name, maxsize=360000, maxsave=3):
        if not os.path.exists(os.path.dirname(name)):
            os.makedirs(os.path.dirname(name))
        self._lf = LogFile(name, "a", maxsize)
        self.maxsave = maxsave

    def __repr__(self):
        return "%s(%r, %r, %r)" % (self.__class__.__name__, self._lf.name, 
                                   self._lf.maxsize, self.maxsave)

    def write(self, data):
        try:
            self._lf.write(data)
        except SizeError:
            self._lf = rotate(self._lf, self.maxsave)

    def note(self, data):
        try:
            self._lf.note(data)
        except SizeError:
            self._lf = rotate(self._lf, self.maxsave)

    def written(self):
        return self._lf.written

    def rotate(self): 
        self._lf = rotate(self._lf, self.maxsave)

    # auto-delegate remaining methods (but you should not read or seek an open
    # log file).
    def __getattr__(self, name):
        return getattr(self._lf, name)


# useful for logged stdout for daemon processes
class ManagedStdio(ManagedLog):
    def write(self, data):
        try:
            self._lf.write(data)
        except SizeError:
            sys.stdout.flush()
            sys.stderr.flush()
            self._lf = rotate(self._lf, self.maxsave)
            fd = self._lf.fileno()
            os.dup2(fd, 1)
            os.dup2(fd, 2)
            sys.stdout = sys.stderr = self


def rotate(fileobj, maxsave=9):
    name = fileobj.name
    mode = fileobj.mode
    maxsize = fileobj.maxsize
    fileobj.close()
    shiftlogs(name, maxsave)
    return LogFile(name, mode, maxsize)


# assumes basename logfile is closed.
def shiftlogs(basename, maxsave):
    topname = "%s.%d" % (basename, maxsave)
    if os.path.isfile(topname):
        os.unlink(topname)

    for i in range(maxsave, 0, -1):
        oldname = "%s.%d" % (basename, i)
        newname = "%s.%d" % (basename, i+1)
        try:
            os.rename(oldname, newname)
        except OSError:
            pass
    try:
        os.rename(basename, "%s.1" % (basename))
    except OSError:
        pass


def open(name, maxsize=360000, maxsave=9):
    return ManagedLog(name, maxsize, maxsave)

def writelog(logobj, data):
    try:
        logobj.write(data)
    except SizeError:
        return rotate(logobj)
    else:
        return logobj