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#       daemonlogger.py
#
#       Copyright 2010 Bud P. Bruegger <bud@sistema.it>
#       Created on Mon, 25 Oct 2010
#       http://code.activestate.com/recipes/577442-logging-support-for-python-daemon/
#
#       BSD Licence
#
#       Redistribution and use in source and binary forms, with or without
#       modification, are permitted provided that the following conditions are
#       met:
#
#       * Redistributions of source code must retain the above copyright
#         notice, this list of conditions and the following disclaimer.
#       * Redistributions in binary form must reproduce the above
#         copyright notice, this list of conditions and the following disclaimer
#         in the documentation and/or other materials provided with the
#         distribution.
#       * Neither the name of the author nor the names of its
#         contributors may be used to endorse or promote products derived from
#         this software without specific prior written permission.
#
#       THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
#       "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
#       LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
#       A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
#       OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#       SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
#       LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
#       DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
#       THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
#       (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
#       OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import os
import sys
import daemon

class FileLikeLogger:
    "wraps a logging.Logger into a file like object"

    def __init__(self, logger):
        self.logger = logger

    def write(self, _str):
        _str = _str.rstrip() #get rid of all tailing newlines and white space
        if _str: #don't log emtpy lines
            for line in _str.split('\n'):
                self.logger.critical(line) #critical to log at any logLevel

    def flush(self):
        for handler in self.logger.handlers:
            handler.flush()

    def close(self):
        for handler in self.logger.handlers:
            handler.close()

def openFilesFromLoggers(loggers):
    "returns the open files used by file-based handlers of the specified loggers"
    openFiles = []
    for logger in loggers:
        for handler in logger.handlers:
            if hasattr(handler, 'stream') and \
               hasattr(handler.stream, 'fileno'):
                openFiles.append(handler.stream)
    return openFiles

class LoggingDaemonContext(daemon.DaemonContext):

    def _addLoggerFiles(self):
        "adds all files related to loggers_preserve to files_preserve"
        for logger in [self.stdout_logger, self.stderr_logger]:
            if logger:
                self.loggers_preserve.append(logger)
        loggerFiles = openFilesFromLoggers(self.loggers_preserve)
        self.files_preserve.extend(loggerFiles)

    def __init__(
        self,
        chroot_directory=None,
        working_directory='/',
        umask=0,
        uid=None,
        gid=None,
        prevent_core=True,
        detach_process=None,
        files_preserve=[],   # changed default
        loggers_preserve=[], # new
        pidfile=None,
        stdout_logger = None,  # new
        stderr_logger = None,  # new
        #stdin,   omitted!
        #stdout,  omitted!
        #sterr,   omitted!
        signal_map=None,
        ):

        self.stdout_logger = stdout_logger
        self.stderr_logger = stderr_logger
        self.loggers_preserve = loggers_preserve

        devnull_in = open(os.devnull, 'r+')
        devnull_out = open(os.devnull, 'w+')
        files_preserve.extend([devnull_in, devnull_out])

        daemon.DaemonContext.__init__(self,
            chroot_directory = chroot_directory,
            working_directory = working_directory,
            umask = umask,
            uid = uid,
            gid = gid,
            prevent_core = prevent_core,
            detach_process = detach_process,
            files_preserve = files_preserve,
            pidfile = pidfile,
            stdin = devnull_in,
            stdout = devnull_out,
            stderr = devnull_out,
            signal_map = signal_map)

    def open(self):
        self._addLoggerFiles()
        daemon.DaemonContext.open(self)
        if self.stdout_logger:
            fileLikeObj = FileLikeLogger(self.stdout_logger)
            sys.stdout = fileLikeObj
        if self.stderr_logger:
            fileLikeObj = FileLikeLogger(self.stderr_logger)
            sys.stderr = fileLikeObj