jw-python/tools/python/jwutils/log.py

from __future__ import print_function
import syslog
import sys
import inspect
import re
from os.path import basename
from datetime import datetime
from typing import List, Tuple
from . import misc

# --- python 2 / 3 compatibility stuff
try:
    basestring # type: ignore
except NameError:
    basestring = str

_special_chars = {
    '\a' : '\\a',
    '\b' : '\\b',
    '\t' : '\\t',
    '\n' : '\\n',
    '\v' : '\\v',
    '\f' : '\\f',
    '\r' : '\\r',
}

_special_char_regex = re.compile("(%s)" % "|".join(map(re.escape, _special_chars.keys())))

EMERG                = int(syslog.LOG_EMERG)
ALERT                = int(syslog.LOG_ALERT)
CRIT                 = int(syslog.LOG_CRIT)
ERR                  = int(syslog.LOG_ERR)
WARNING              = int(syslog.LOG_WARNING)
NOTICE               = int(syslog.LOG_NOTICE)
INFO                 = int(syslog.LOG_INFO)
DEBUG                = int(syslog.LOG_DEBUG)
DEVEL                = int(syslog.LOG_DEBUG + 1)
OFF                  = DEVEL + 1

_level               = NOTICE

CONSOLE_FONT_BOLD    = '\033[1m'
CONSOLE_FONT_RED     = '\033[31m'
CONSOLE_FONT_GREEN   = '\033[32m'
CONSOLE_FONT_YELLOW  = '\033[33m'
CONSOLE_FONT_BLUE    = '\033[34m'

CONSOLE_FONT_MAGENTA = '\033[35m'
CONSOLE_FONT_CYAN    = '\033[36m'
CONSOLE_FONT_WHITE   = '\033[37m'

CONSOLE_FONT_BLINK   = '\033[5m'
CONSOLE_FONT_OFF     = '\033[m'

f_position           = 'position'
f_date               = 'date'
f_stderr             = 'stderr'
f_stdout             = 'stdout'
f_prio               = 'prio'
f_color              = 'color'
f_default            = [ f_position, f_stderr, f_prio, f_color ]

_flags               = set(f_default)
_log_prefix          = ''
_file_name_len       = 20

_short_prio_str      = {
    EMERG            : '<Y>',
    ALERT            : '<A>',
    CRIT             : '<C>',
    ERR              : '<E>',
    WARNING          : '<W>',
    NOTICE           : '<N>',
    INFO             : '<I>',
    DEBUG            : '<D>',
    DEVEL            : '<V>',
}

_prio_colors         = {
    DEVEL            : [ "", "" ],
    DEBUG            : [ "", "" ],
    INFO             : [ CONSOLE_FONT_BLUE, CONSOLE_FONT_OFF ],
    NOTICE           : [ CONSOLE_FONT_GREEN, CONSOLE_FONT_OFF ],
    WARNING          : [ CONSOLE_FONT_YELLOW, CONSOLE_FONT_OFF ],
    ERR              : [ CONSOLE_FONT_BOLD + CONSOLE_FONT_RED, CONSOLE_FONT_OFF ],
    CRIT             : [ CONSOLE_FONT_BOLD + CONSOLE_FONT_MAGENTA, CONSOLE_FONT_OFF ],
    ALERT            : [ CONSOLE_FONT_BOLD + CONSOLE_FONT_MAGENTA, CONSOLE_FONT_OFF ],
    EMERG            : [ CONSOLE_FONT_BOLD + CONSOLE_FONT_MAGENTA, CONSOLE_FONT_OFF ],
}

def get_caller_pos(up: int = 1, kwargs=None) -> Tuple[str, int]:
    if kwargs and 'caller' in kwargs:
        r = kwargs['caller']
        del kwargs['caller']
        return r
    caller = inspect.stack()[up+1]
    return (basename(caller.filename), caller.lineno)

def slog_m(prio: int, *args, **kwargs) -> None: # export
    if prio > _level:
        return
    if len(args):
        margs = ''
        for a in args:
            if isinstance(a, list):
                margs += '\n'.join([str(elem) for elem in a])
                continue
            margs += ' ' + str(a)
    if 'caller' not in kwargs:
        caller = get_caller_pos(1)
    else:
        caller = kwargs['caller']
        del kwargs['caller']
    for line in margs[1:].split('\n'):
        slog(prio, line, **kwargs, caller=caller)

def slog(prio: int, *args, only_printable=False, **kwargs) -> None: # export

    if prio > _level:
        return

    msg = ''
    color_on = ''
    color_off = ''

    if f_date in _flags:
        msg += datetime.now().strftime("%b %d %H:%M:%S.%f ")

    if f_prio in _flags:
        msg += _short_prio_str[prio] + ' '

    if f_position in _flags:
        if 'caller' in kwargs:
            name, line = kwargs['caller']
        else:
            name, line = get_caller_pos(1)
        msg += misc.pad(name, _file_name_len) + '[' + misc.pad(str(line), 4, True) + ']'

    if f_color in _flags:
        color_on, color_off = console_color_chars(prio)

    msg += _log_prefix

    if len(args):
        margs = ''
        for a in args:
            margs += ' ' + str(a)
        if only_printable:
            margs = _special_char_regex.sub(lambda mo: _special_chars[mo.string[mo.start():mo.end()]], margs)
            margs = re.sub('[\x01-\x1f]', '.', margs)
        msg += color_on + margs + color_off

    if not len(msg):
        return

    files = []
    if f_stdout in _flags:
        files.append(sys.stdout)

    if f_stderr in _flags:
        files.append(sys.stderr)

    if not len(files):
        files = [ sys.stdout ]

    for file in files:
        print(msg, file=file)

def parse_log_prio_str(prio: str) -> int: # export
    try:
        r = int(prio)
        if r < 0 or r > DEVEL:
            raise Exception("Invalid log priority ", prio)
    except ValueError:
        map_prio_str_to_val = {
            "EMERG"     : EMERG,
            "emerg"     : EMERG,
            "ALERT"     : ALERT,
            "alert"     : ALERT,
            "CRIT"      : CRIT,
            "crit"      : CRIT,
            "ERR"       : ERR,
            "err"       : ERR,
            "WARNING"   : WARNING,
            "warning"   : WARNING,
            "NOTICE"    : NOTICE,
            "notice"    : NOTICE,
            "INFO"      : INFO,
            "info"      : INFO,
            "DEBUG"     : DEBUG,
            "debug"     : DEBUG,
            "DEVEL"     : DEVEL,
            "devel"     : DEVEL,
            "OFF"       : OFF,
            "off"       : OFF,
        }
        if prio in map_prio_str_to_val:
            return map_prio_str_to_val[prio]
    raise Exception("Unknown priority string \"", prio, "\"")

def console_color_chars(prio: int) -> List[str]: # export
    if not sys.stdout.isatty():
        return [ '', '' ]
    return _prio_colors[prio]

def set_level(level_: str) -> None: # export
    global _level
    if isinstance(level_, basestring):
        _level = parse_log_prio_str(level_)
        return
    _level = level_

def set_flags(flags_: str) -> None: # export
    global _flags
    _flags = set(flags_.split(','))

    #syslog
    #console
    #color
    #prio
    #position
    #ide
    #trace_rename_thread_to_shorter
    #trace_rename_thread_to_longer
    #trace_inout
    #skip_openlog
    #id
    #date
    #pid
    #highlight_first_error

def append_to_prefix(prefix: str) -> str: # export
    global _log_prefix
    r = _log_prefix
    if prefix:
        _log_prefix += prefix
    return r

def remove_from_prefix(count) -> str: # export
    if isinstance(count, str):
        count = len(count)
    global _log_prefix
    r = _log_prefix
    _log_prefix = _log_prefix[:-count]
    return r

def set_filename_length(l: int) -> int: # export
    global _file_name_len
    r = _file_name_len
    if l:
        _file_name_len = l
    return r