#!/usr/bin/env python
# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>). All Rights Reserved
#    The refactoring about the OpenSSL support come from Tryton
#    Copyright (C) 2007-2009 Cédric Krier.
#    Copyright (C) 2007-2009 Bertrand Chenal.
#    Copyright (C) 2008 B2CK SPRL.
#
#    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 3 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, see <http://www.gnu.org/licenses/>.
#
##############################################################################

import errno
import logging
import logging.handlers
import os
import socket
import sys
import threading
import time
import release
from pprint import pformat
import warnings
import heapq

class Service(object):
    """ Base class for *Local* services

        Functionality here is trusted, no authentication.
    """
    _services = {}
    def __init__(self, name, audience=''):
        Service._services[name] = self
        self.__name = name
        self._methods = {}

    def joinGroup(self, name):
        raise Exception("No group for local services")
        #GROUPS.setdefault(name, {})[self.__name] = self

    @classmethod
    def exists(cls, name):
        return name in cls._services

    @classmethod
    def remove(cls, name):
        if cls.exists(name):
            cls._services.pop(name)

    def exportMethod(self, method):
        if callable(method):
            self._methods[method.__name__] = method

    def abortResponse(self, error, description, origin, details):
        if not tools.config['debug_mode']:
            raise Exception("%s -- %s\n\n%s"%(origin, description, details))
        else:
            raise

class LocalService(object):
    """ Proxy for local services. 
    
        Any instance of this class will behave like the single instance
        of Service(name)
    """
    __logger = logging.getLogger('service')
    def __init__(self, name):
        self.__name = name
        try:
            self._service = Service._services[name]
            for method_name, method_definition in self._service._methods.items():
                setattr(self, method_name, method_definition)
        except KeyError, keyError:
            self.__logger.error('This service does not exist: %s' % (str(keyError),) )
            raise

    def __call__(self, method, *params):
        return getattr(self, method)(*params)

class ExportService(object):
    """ Proxy for exported services. 

    All methods here should take an AuthProxy as their first parameter. It
    will be appended by the calling framework.

    Note that this class has no direct proxy, capable of calling 
    eservice.method(). Rather, the proxy should call 
    dispatch(method,auth,params)
    """
    
    _services = {}
    _groups = {}
    _logger = logging.getLogger('web-services')
    
    def __init__(self, name, audience=''):
        ExportService._services[name] = self
        self.__name = name
        self._logger.debug("Registered an exported service: %s" % name)

    def joinGroup(self, name):
        ExportService._groups.setdefault(name, {})[self.__name] = self

    @classmethod
    def getService(cls,name):
        return cls._services[name]

    def dispatch(self, method, auth, params):
        raise Exception("stub dispatch at %s" % self.__name)
        
    def new_dispatch(self,method,auth,params):
        raise Exception("stub dispatch at %s" % self.__name)

    def abortResponse(self, error, description, origin, details):
        if not tools.config['debug_mode']:
            raise Exception("%s -- %s\n\n%s"%(origin, description, details))
        else:
            raise

LOG_NOTSET = 'notset'
LOG_DEBUG_SQL = 'debug_sql'
LOG_DEBUG_RPC = 'debug_rpc'
LOG_DEBUG_RPC_ANSWER = 'debug_rpc_answer'
LOG_DEBUG = 'debug'
LOG_TEST = 'test'
LOG_INFO = 'info'
LOG_WARNING = 'warn'
LOG_ERROR = 'error'
LOG_CRITICAL = 'critical'

logging.DEBUG_RPC_ANSWER = logging.DEBUG - 4
logging.addLevelName(logging.DEBUG_RPC_ANSWER, 'DEBUG_RPC_ANSWER')
logging.DEBUG_RPC = logging.DEBUG - 2
logging.addLevelName(logging.DEBUG_RPC, 'DEBUG_RPC')
logging.DEBUG_SQL = logging.DEBUG_RPC - 3
logging.addLevelName(logging.DEBUG_SQL, 'DEBUG_SQL')

logging.TEST = logging.INFO - 5
logging.addLevelName(logging.TEST, 'TEST')

BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, _NOTHING, DEFAULT = range(10)
#The background is set with 40 plus the number of the color, and the foreground with 30
#These are the sequences need to get colored ouput
RESET_SEQ = "\033[0m"
COLOR_SEQ = "\033[1;%dm"
BOLD_SEQ = "\033[1m"
COLOR_PATTERN = "%s%s%%s%s" % (COLOR_SEQ, COLOR_SEQ, RESET_SEQ)
LEVEL_COLOR_MAPPING = {
    logging.DEBUG_SQL: (WHITE, MAGENTA),
    logging.DEBUG_RPC: (BLUE, WHITE),
    logging.DEBUG_RPC_ANSWER: (BLUE, WHITE),
    logging.DEBUG: (BLUE, DEFAULT),
    logging.INFO: (GREEN, DEFAULT),
    logging.TEST: (WHITE, BLUE),
    logging.WARNING: (YELLOW, DEFAULT),
    logging.ERROR: (RED, DEFAULT),
    logging.CRITICAL: (WHITE, RED),
}

class DBFormatter(logging.Formatter):
    def format(self, record):
        record.dbname = getattr(threading.currentThread(), 'dbname', '?')
        return logging.Formatter.format(self, record)

class ColoredFormatter(DBFormatter):
    def format(self, record):
        fg_color, bg_color = LEVEL_COLOR_MAPPING[record.levelno]
        record.levelname = COLOR_PATTERN % (30 + fg_color, 40 + bg_color, record.levelname)
        return DBFormatter.format(self, record)

def init_logger():
    import os
    from tools.translate import resetlocale
    resetlocale()

    # create a format for log messages and dates
    format = '[%(asctime)s][%(dbname)s] %(levelname)s:%(name)s:%(message)s'

    if tools.config['syslog']:
        # SysLog Handler
        if os.name == 'nt':
            handler = logging.handlers.NTEventLogHandler("%s %s" % (release.description, release.version))
        else:
            handler = logging.handlers.SysLogHandler('/dev/log')
        format = '%s %s' % (release.description, release.version) \
                + ':%(dbname)s:%(levelname)s:%(name)s:%(message)s'

    elif tools.config['logfile']:
        # LogFile Handler
        logf = tools.config['logfile']
        try:
            dirname = os.path.dirname(logf)
            if dirname and not os.path.isdir(dirname):
                os.makedirs(dirname)
            if tools.config['logrotate'] is not False:
                handler = logging.handlers.TimedRotatingFileHandler(logf,'D',1,30)
            elif os.name == 'posix':
                handler = logging.handlers.WatchedFileHandler(logf)
            else:
                handler = logging.handlers.FileHandler(logf)
        except Exception, ex:
            sys.stderr.write("ERROR: couldn't create the logfile directory. Logging to the standard output.\n")
            handler = logging.StreamHandler(sys.stdout)
    else:
        # Normal Handler on standard output
        handler = logging.StreamHandler(sys.stdout)

    if isinstance(handler, logging.StreamHandler) and os.isatty(handler.stream.fileno()):
        formatter = ColoredFormatter(format)
    else:
        formatter = DBFormatter(format)
    handler.setFormatter(formatter)

    # add the handler to the root logger
    logger = logging.getLogger()
    logger.addHandler(handler)
    logger.setLevel(int(tools.config['log_level'] or '0'))


class Logger(object):
    def __init__(self):
        warnings.warn("The netsvc.Logger API shouldn't be used anymore, please "
                      "use the standard `logging.getLogger` API instead",
                      PendingDeprecationWarning, stacklevel=2)
        super(Logger, self).__init__()

    def notifyChannel(self, name, level, msg):
        warnings.warn("notifyChannel API shouldn't be used anymore, please use "
                      "the standard `logging` module instead",
                      PendingDeprecationWarning, stacklevel=2)
        from service.web_services import common

        log = logging.getLogger(tools.ustr(name))

        if level in [LOG_DEBUG_RPC, LOG_TEST] and not hasattr(log, level):
            fct = lambda msg, *args, **kwargs: log.log(getattr(logging, level.upper()), msg, *args, **kwargs)
            setattr(log, level, fct)


        level_method = getattr(log, level)

        if isinstance(msg, Exception):
            msg = tools.exception_to_unicode(msg)

        try:
            msg = tools.ustr(msg).strip()
            if level in (LOG_ERROR, LOG_CRITICAL) and tools.config.get_misc('debug','env_info',False):
                msg = common().exp_get_server_environment() + "\n" + msg

            result = msg.split('\n')
        except UnicodeDecodeError:
            result = msg.strip().split('\n')
        try:
            if len(result)>1:
                for idx, s in enumerate(result):
                    level_method('[%02d]: %s' % (idx+1, s,))
            elif result:
                level_method(result[0])
        except IOError,e:
            # TODO: perhaps reset the logger streams?
            #if logrotate closes our files, we end up here..
            pass
        except:
            # better ignore the exception and carry on..
            pass

    def set_loglevel(self, level, logger=None):
        if logger is not None:
            log = logging.getLogger(str(logger))
        else:
            log = logging.getLogger()
        log.setLevel(logging.INFO) # make sure next msg is printed
        log.info("Log level changed to %s" % logging.getLevelName(level))
        log.setLevel(level)

    def shutdown(self):
        logging.shutdown()

import tools
init_logger()

class Agent(object):
    """Singleton that keeps track of cancellable tasks to run at a given
       timestamp.
       The tasks are caracterised by:
            * a timestamp
            * the database on which the task run
            * the function to call
            * the arguments and keyword arguments to pass to the function

        Implementation details:
          Tasks are stored as list, allowing the cancellation by setting
          the timestamp to 0.
          A heapq is used to store tasks, so we don't need to sort
          tasks ourself.
    """
    __tasks = []
    __tasks_by_db = {}
    _logger = Logger()

    @classmethod
    def setAlarm(cls, function, timestamp, db_name, *args, **kwargs):
        task = [timestamp, db_name, function, args, kwargs]
        heapq.heappush(cls.__tasks, task)
        cls.__tasks_by_db.setdefault(db_name, []).append(task)

    @classmethod
    def cancel(cls, db_name):
        """Cancel all tasks for a given database. If None is passed, all tasks are cancelled"""
        if db_name is None:
            cls.__tasks, cls.__tasks_by_db = [], {}
        else:
            if db_name in cls.__tasks_by_db:
                for task in cls.__tasks_by_db[db_name]:
                    task[0] = 0

    @classmethod
    def quit(cls):
        cls.cancel(None)

    @classmethod
    def runner(cls):
        """Neverending function (intended to be ran in a dedicated thread) that
           checks every 60 seconds tasks to run.
        """
        current_thread = threading.currentThread()
        while True:
            while cls.__tasks and cls.__tasks[0][0] < time.time():
                task = heapq.heappop(cls.__tasks)
                timestamp, dbname, function, args, kwargs = task
                cls.__tasks_by_db[dbname].remove(task)
                if not timestamp:
                    # null timestamp -> cancelled task
                    continue
                current_thread.dbname = dbname   # hack hack
                cls._logger.notifyChannel('timers', LOG_DEBUG, "Run %s.%s(*%r, **%r)" % (function.im_class.__name__, function.func_name, args, kwargs))
                delattr(current_thread, 'dbname')
                task_thread = threading.Thread(target=function, name='netsvc.Agent.task', args=args, kwargs=kwargs)
                # force non-daemon task threads (the runner thread must be daemon, and this property is inherited by default)
                task_thread.setDaemon(False)
                task_thread.start()
                time.sleep(1)
            time.sleep(60)

agent_runner = threading.Thread(target=Agent.runner, name="netsvc.Agent.runner")
# the agent runner is a typical daemon thread, that will never quit and must be
# terminated when the main process exits - with no consequence (the processing
# threads it spawns are not marked daemon)
agent_runner.setDaemon(True)
agent_runner.start()


import traceback

class Server:
    """ Generic interface for all servers with an event loop etc.
        Override this to impement http, net-rpc etc. servers.

        Servers here must have threaded behaviour. start() must not block,
        there is no run().
    """
    __is_started = False
    __servers = []
    __starter_threads = []

    # we don't want blocking server calls (think select()) to
    # wait forever and possibly prevent exiting the process,
    # but instead we want a form of polling/busy_wait pattern, where
    # _server_timeout should be used as the default timeout for
    # all I/O blocking operations
    _busywait_timeout = 0.5


    __logger = logging.getLogger('server')

    def __init__(self):
        Server.__servers.append(self)
        if Server.__is_started:
            # raise Exception('All instances of servers must be inited before the startAll()')
            # Since the startAll() won't be called again, allow this server to
            # init and then start it after 1sec (hopefully). Register that
            # timer thread in a list, so that we can abort the start if quitAll
            # is called in the meantime
            t = threading.Timer(1.0, self._late_start)
            t.name = 'Late start timer for %s' % str(self.__class__)
            Server.__starter_threads.append(t)
            t.start()

    def start(self):
        self.__logger.debug("called stub Server.start")
        
    def _late_start(self):
        self.start()
        for thr in Server.__starter_threads:
            if thr.finished.is_set():
                Server.__starter_threads.remove(thr)

    def stop(self):
        self.__logger.debug("called stub Server.stop")

    def stats(self):
        """ This function should return statistics about the server """
        return "%s: No statistics" % str(self.__class__)

    @classmethod
    def startAll(cls):
        if cls.__is_started:
            return
        cls.__logger.info("Starting %d services" % len(cls.__servers))
        for srv in cls.__servers:
            srv.start()
        cls.__is_started = True

    @classmethod
    def quitAll(cls):
        if not cls.__is_started:
            return
        cls.__logger.info("Stopping %d services" % len(cls.__servers))
        for thr in cls.__starter_threads:
            if not thr.finished.is_set():
                thr.cancel()
            cls.__starter_threads.remove(thr)

        for srv in cls.__servers:
            srv.stop()
        cls.__is_started = False

    @classmethod
    def allStats(cls):
        res = ["Servers %s" % ('stopped', 'started')[cls.__is_started]]
        res.extend(srv.stats() for srv in cls.__servers)
        return '\n'.join(res)

    def _close_socket(self):
        if os.name != 'nt':
            try:
                self.socket.shutdown(getattr(socket, 'SHUT_RDWR', 2))
            except socket.error, e:
                if e.errno != errno.ENOTCONN: raise
                # OSX, socket shutdowns both sides if any side closes it
                # causing an error 57 'Socket is not connected' on shutdown
                # of the other side (or something), see
                # http://bugs.python.org/issue4397
                self.__logger.debug(
                    '"%s" when shutting down server socket, '
                    'this is normal under OS X', e)
        self.socket.close()

class OpenERPDispatcherException(Exception):
    def __init__(self, exception, traceback):
        self.exception = exception
        self.traceback = traceback

class OpenERPDispatcher:
    def log(self, title, msg, channel=logging.DEBUG_RPC, depth=2):
        logger = logging.getLogger(title)
        if logger.isEnabledFor(channel):
            for line in pformat(msg, depth=depth).split('\n'):
                logger.log(channel, line)

    def dispatch(self, service_name, method, params):
        try:
            self.log('service', service_name)
            self.log('method', method)
            self.log('params', params)
            auth = getattr(self, 'auth_provider', None)
            result = ExportService.getService(service_name).dispatch(method, auth, params)
            logger = logging.getLogger('result')
            self.log('result', result, channel=logging.DEBUG_RPC_ANSWER, depth=(logger.isEnabledFor(logging.DEBUG_SQL) and 1 or None))
            return result
        except Exception, e:
            self.log('exception', tools.exception_to_unicode(e))
            tb = getattr(e, 'traceback', sys.exc_info())
            tb_s = "".join(traceback.format_exception(*tb))
            if tools.config['debug_mode']:
                import pdb
                pdb.post_mortem(tb[2])
            raise OpenERPDispatcherException(e, tb_s)

# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: