'''
Copyright (C) 2019 Vanessa Sochat.
This Source Code Form is subject to the terms of the
Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed
with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
The watcher is actually a connection to crontab. This is what helps to schedule
the watched to check for changes at some frequency, and update the files.
'''
import os
import sys
from .spinner import Spinner
ABORT = -5
CRITICAL = -4
ERROR = -3
WARNING = -2
LOG = -1
INFO = 1
CUSTOM = 1
QUIET = 0
VERBOSE = VERBOSE1 = 2
VERBOSE2 = 3
VERBOSE3 = 4
DEBUG = 5
PURPLE = "\033[95m"
YELLOW = "\033[93m"
RED = "\033[91m"
DARKRED = "\033[31m"
CYAN = "\033[36m"
[docs]class WatchMeMessage:
def __init__(self, MESSAGELEVEL=None):
self.level = get_logging_level()
self.history = []
self.errorStream = sys.stderr
self.outputStream = sys.stdout
self.colorize = self.useColor()
self.colors = {ABORT: DARKRED,
CRITICAL: RED,
ERROR: RED,
WARNING: YELLOW,
LOG: PURPLE,
CUSTOM: PURPLE,
DEBUG: CYAN,
'OFF': "\033[0m", # end sequence
'CYAN':CYAN,
'PURPLE':PURPLE,
'RED':RED,
'DARKRED':DARKRED,
'YELLOW':YELLOW}
# Colors --------------------------------------------
[docs] def useColor(self):
'''useColor will determine if color should be added
to a print. Will check if being run in a terminal, and
if has support for asci'''
COLORIZE = get_user_color_preference()
if COLORIZE is not None:
return COLORIZE
streams = [self.errorStream, self.outputStream]
for stream in streams:
if not hasattr(stream, 'isatty'):
return False
if not stream.isatty():
return False
return True
[docs] def addColor(self, level, text):
'''addColor to the prompt (usually prefix) if terminal
supports, and specified to do so'''
if self.colorize:
if level in self.colors:
text = "%s%s%s" % (self.colors[level],
text,
self.colors["OFF"])
return text
[docs] def emitError(self, level):
'''determine if a level should print to
stderr, includes all levels but INFO and QUIET'''
if level in [ABORT,
ERROR,
WARNING,
VERBOSE,
VERBOSE1,
VERBOSE2,
VERBOSE3,
DEBUG]:
return True
return False
[docs] def emitOutput(self, level):
'''determine if a level should print to stdout
only includes INFO'''
if level in [LOG,
INFO]:
return True
return False
[docs] def isEnabledFor(self, messageLevel):
'''check if a messageLevel is enabled to emit a level
'''
if messageLevel <= self.level:
return True
return False
[docs] def emit(self, level, message, prefix=None, color=None):
'''emit is the main function to print the message
optionally with a prefix
:param level: the level of the message
:param message: the message to print
:param prefix: a prefix for the message
'''
if color is None:
color = level
if prefix is not None:
prefix = self.addColor(color, "%s " % (prefix))
else:
prefix = ""
message = self.addColor(color, message)
# Add the prefix
message = "%s%s" % (prefix, message)
if not message.endswith('\n'):
message = "%s\n" % message
# If the level is quiet, only print to error
if self.level == QUIET:
pass
# Otherwise if in range print to stdout and stderr
elif self.isEnabledFor(level):
if self.emitError(level):
self.write(self.errorStream, message)
else:
self.write(self.outputStream, message)
# Add all log messages to history
self.history.append(message)
[docs] def write(self, stream, message):
'''write will write a message to a stream,
first checking the encoding
'''
if isinstance(message, bytes):
message = message.decode('utf-8')
stream.write(message)
[docs] def get_logs(self, join_newline=True):
''''get_logs will return the complete history, joined by newline
(default) or as is.
'''
if join_newline:
return '\n'.join(self.history)
return self.history
[docs] def show_progress(
self,
iteration,
total,
length=40,
min_level=0,
prefix=None,
carriage_return=True,
suffix=None,
symbol=None):
'''create a terminal progress bar, default bar shows for verbose+
:param iteration: current iteration (Int)
:param total: total iterations (Int)
:param length: character length of bar (Int)
'''
percent = 100 * (iteration / float(total))
progress = int(length * iteration // total)
if suffix is None:
suffix = ''
if prefix is None:
prefix = 'Progress'
# Download sizes can be imperfect, setting carriage_return to False
# and writing newline with caller cleans up the UI
if percent >= 100:
percent = 100
progress = length
if symbol is None:
symbol = "="
if progress < length:
bar = symbol * progress + '|' + '-' * (length - progress - 1)
else:
bar = symbol * progress + '-' * (length - progress)
# Only show progress bar for level > min_level
if self.level > min_level:
percent = "%5s" % ("{0:.1f}").format(percent)
output = '\r' + prefix + \
" |%s| %s%s %s" % (bar, percent, '%', suffix)
sys.stdout.write(output)
if iteration == total and carriage_return:
sys.stdout.write('\n')
sys.stdout.flush()
# Logging ------------------------------------------
[docs] def abort(self, message):
self.emit(ABORT, message, 'ABORT')
[docs] def critical(self, message):
self.emit(CRITICAL, message, 'CRITICAL')
[docs] def error(self, message):
self.emit(ERROR, message, 'ERROR')
[docs] def exit(self, message, error_code=255):
self.emit(ERROR, message, 'ERROR')
sys.exit(error_code)
[docs] def warning(self, message):
self.emit(WARNING, message, 'WARNING')
[docs] def log(self, message):
self.emit(LOG, message, 'LOG')
[docs] def custom(self, prefix, message="", color=PURPLE):
self.emit(CUSTOM, message, prefix, color)
[docs] def info(self, message):
self.emit(INFO, message)
[docs] def newline(self):
return self.info("")
[docs] def verbose(self, message):
self.emit(VERBOSE, message, "VERBOSE")
[docs] def verbose1(self, message):
self.emit(VERBOSE, message, "VERBOSE1")
[docs] def verbose2(self, message):
self.emit(VERBOSE2, message, 'VERBOSE2')
[docs] def verbose3(self, message):
self.emit(VERBOSE3, message, 'VERBOSE3')
[docs] def debug(self, message):
self.emit(DEBUG, message, 'DEBUG')
[docs] def is_quiet(self):
'''is_quiet returns true if the level is under 1
'''
if self.level < 1:
return False
return True
# Terminal ------------------------------------------
[docs] def table(self, rows, col_width=2):
'''table will print a table of entries. If the rows is
a dictionary, the keys are interpreted as column names. if
not, a numbered list is used.
'''
labels = [str(x) for x in range(1,len(rows)+1)]
if isinstance(rows, dict):
labels = list(rows.keys())
rows = list(rows.values())
for row in rows:
label = labels.pop(0)
label = label.ljust(col_width)
message = "\t".join(row)
self.custom(prefix=label,
message=message)
[docs]def get_logging_level():
'''get_logging_level will configure a logging to standard out based on the user's
selected level, which should be in an environment variable called
MESSAGELEVEL. if MESSAGELEVEL is not set, the maximum level
(5) is assumed (all messages).
'''
try:
level = int(os.environ.get("MESSAGELEVEL", INFO))
except ValueError:
level = os.environ.get("MESSAGELEVEL", INFO)
if level == "CRITICAL":
return CRITICAL
elif level == "ABORT":
return ABORT
elif level == "ERROR":
return ERROR
elif level == "WARNING":
return WARNING
elif level == "LOG":
return LOG
elif level == "INFO":
return INFO
elif level == "QUIET":
return QUIET
elif level.startswith("VERBOSE"):
return VERBOSE3
elif level == "LOG":
return LOG
elif level == "DEBUG":
return DEBUG
return level
[docs]def get_user_color_preference():
COLORIZE = os.environ.get('WATCHME_COLORIZE', None)
if COLORIZE is not None:
COLORIZE = convert2boolean(COLORIZE)
return COLORIZE
[docs]def convert2boolean(arg):
'''convert2boolean is used for environmental variables that must be
returned as boolean'''
if not isinstance(arg, bool):
return arg.lower() in ("yes", "true", "t", "1", "y")
return arg
WatchMeMessage.spinner = Spinner()
bot = WatchMeMessage()