poezio/src/logger.py

# Copyright 2010-2011 Florent Le Coz <louiz@louiz.org>
#
# This file is part of Poezio.
#
# Poezio is free software: you can redistribute it and/or modify
# it under the terms of the zlib license. See the COPYING file.

from os import environ, makedirs
import os
import re
from datetime import datetime
from config import config
from xhtml import clean_text
from theming import dump_tuple, get_theme

import logging

log = logging.getLogger(__name__)

from config import LOG_DIR

log_dir = os.path.join(LOG_DIR, 'logs')

message_log_re = re.compile('MR (\d{4})(\d{2})(\d{2})T(\d{2}):(\d{2}):(\d{2})Z (\d+) <([^ ]+)>  (.*)')
info_log_re = re.compile('MI (\d{4})(\d{2})(\d{2})T(\d{2}):(\d{2}):(\d{2})Z (\d+) (.*)')

def parse_message_line(msg):
    if re.match(message_log_re, msg):
        return [i for i in re.split(message_log_re, msg) if i]
    elif re.match(info_log_re, msg):
        return [i for i in re.split(info_log_re, msg) if i]
    return False


class Logger(object):
    """
    Appends things to files. Error/information/warning logs
    and also log the conversations to logfiles
    """
    def __init__(self):
        self.logfile = config.get('logfile', 'logs')
        self.roster_logfile = None
        # a dict of 'groupchatname': file-object (opened)
        self.fds = dict()

    def __del__(self):
        for opened_file in self.fds.values():
            if opened_file:
                try:
                    opened_file.close()
                except: # Can't close? too bad
                    pass

    def reload_all(self):
        """Close and reload all the file handles (on SIGHUP)"""
        for opened_file in self.fds.values():
            if opened_file:
                opened_file.close()
        log.debug('All log file handles closed')
        for room in self.fds:
            self.fds[room] = self.check_and_create_log_dir(room)
            log.debug('Log handle for %s re-created', room)

    def check_and_create_log_dir(self, room):
        """
        Check that the directory where we want to log the messages
        exists. if not, create it
        """
        if config.get_by_tabname('use_log', 'false', room) == 'false':
            return
        try:
            makedirs(log_dir)
        except FileExistsError:
            pass
        except:
            log.error('Unable to create the log dir', exc_info=True)
            pass
        try:
            fd = open(os.path.join(log_dir, room), 'a')
            self.fds[room] = fd
            return fd
        except IOError:
            log.error('Unable to open the log file (%s)',
                    os.path.join(log_dir, room),
                    exc_info=True)
            return

    def get_logs(self, jid, nb=10):
        """
        Get the log history for the given jid
        """
        if config.get_by_tabname('load_log', 10, jid) <= 0:
            return

        if nb <= 0:
            return
        try:
            fd = open(os.path.join(log_dir, jid), 'rb')
        except:
            log.error('Unable to open the log file (%s)',
                    os.path.join(log_dir, room),
                    exc_info=True)
            return
        if not fd:
            return

        pos = fd.seek(0, 2)
        reads = 0
        check_next = False
        while reads < nb:
            if pos == 0:
                break
            pos -= 1
            if pos < 0:
                pos = 0
            fd.seek(pos)
            char = fd.read(1)
            if char == b'\n':
                if fd.read(2) in (b'MR', b'MI'):
                    reads += 1
                    fd.seek(-2, 1)
        logs = fd.readlines()
        fd.close()
        lines = []

        for line in logs:
            lines.append(line.decode(errors='replace')[:-1])
        log.debug(lines)

        messages = []
        color = '\x19%s}' % dump_tuple(get_theme().COLOR_INFORMATION_TEXT)

        idx = 0
        while idx < len(lines):
            if lines[idx].startswith(' '): # should not happen ; skip
                idx += 1
                log.debug('fail?')
                continue
            tup = parse_message_line(lines[idx])
            idx += 1
            if not tup or 7 > len(tup) > 10  : # skip
                log.debug('format? %s', tup)
                continue
            time = [int(i) for index, i in enumerate(tup) if index < 6]
            message = {'lines': [], 'history': True, 'time': datetime(*time)}
            size = int(tup[6])
            if len(tup) == 8: #info line
                message['lines'].append(color+tup[7])
            else: # message line
                message['nickname'] = tup[7]
                message['lines'].append(color+tup[8])
            while size != 0 and idx < len(lines):
                message['lines'].append(lines[idx][1:])
                size -= 1
                idx += 1
            message['txt'] = '\n'.join(message['lines'])
            del message['lines']
            messages.append(message)

        return messages

    def log_message(self, jid, nick, msg, date=None, typ=1):
        """
        log the message in the appropriate jid's file
        type: 1 = Message
              2 = Status/whatever
        """
        jid = str(jid).replace('/', '\\')
        if config.get_by_tabname('use_log', 'false', jid) != 'true':
            return True
        if jid in self.fds.keys():
            fd = self.fds[jid]
        else:
            fd = self.check_and_create_log_dir(jid)
        if not fd:
            return True
        try:
            msg = clean_text(msg)
            if date is None:
                str_time = datetime.now().strftime('%Y%m%dT%H:%M:%SZ')
            else:
                str_time = date.strftime('%Y%m%dT%H:%M:%SZ')
            if typ == 1:
                prefix = 'MR'
            else:
                prefix = 'MI'
            lines = msg.split('\n')
            first_line = lines.pop(0)
            nb_lines = str(len(lines)).zfill(3)

            for line in lines:
                self.roster_logfile.write(' %s\n' % line)

            if nick:
                nick = '<' + nick + '>'
                fd.write(' '.join((prefix, str_time, nb_lines, nick, ' '+first_line, '\n')))
            else:
                fd.write(' '.join((prefix, str_time, nb_lines, first_line, '\n')))
            for line in lines:
                fd.write(' %s\n' % line)
        except:
            log.error('Unable to write in the log file (%s)',
                    os.path.join(log_dir, jid),
                    exc_info=True)
            return False
        else:
            try:
                fd.flush()          # TODO do something better here?
            except:
                log.error('Unable to flush the log file (%s)',
                        os.path.join(log_dir, jid),
                        exc_info=True)
                return False
        return True

    def log_roster_change(self, jid, message):
        """
        Log a roster change
        """
        if config.get_by_tabname('use_log', 'false', jid) != 'true':
            return True
        if not self.roster_logfile:
            try:
                self.roster_logfile = open(os.path.join(log_dir, 'roster.log'), 'a')
            except IOError:
                log.error('Unable to create the log file (%s)',
                        os.path.join(log_dir, 'roster.log'),
                        exc_info=True)
                return False
        try:
            str_time = datetime.now().strftime('%Y%m%dT%H:%M:%SZ')
            message = clean_text(message)
            lines = message.split('\n')
            first_line = lines.pop(0)
            nb_lines = str(len(lines)).zfill(3)
            self.roster_logfile.write('MI %s %s %s %s\n' % (str_time, nb_lines, jid, first_line))
            for line in lines:
                self.roster_logfile.write(' %s\n' % line)
            self.roster_logfile.flush()
        except:
            log.error('Unable to write in the log file (%s)',
                    os.path.join(log_dir, 'roster.log'),
                    exc_info=True)
            return False
        return True

logger = Logger()