345 lines
11 KiB
Python
345 lines
11 KiB
Python
from __future__ import absolute_import
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from __future__ import division
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import itertools
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import sys
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from signal import signal, SIGINT, default_int_handler
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import time
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import contextlib
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import logging
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from pip.compat import WINDOWS
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from pip.utils import format_size
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from pip.utils.logging import get_indentation
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from pip._vendor import six
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from pip._vendor.progress.bar import Bar, IncrementalBar
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from pip._vendor.progress.helpers import (WritelnMixin,
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HIDE_CURSOR, SHOW_CURSOR)
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from pip._vendor.progress.spinner import Spinner
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try:
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from pip._vendor import colorama
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# Lots of different errors can come from this, including SystemError and
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# ImportError.
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except Exception:
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colorama = None
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logger = logging.getLogger(__name__)
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def _select_progress_class(preferred, fallback):
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encoding = getattr(preferred.file, "encoding", None)
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# If we don't know what encoding this file is in, then we'll just assume
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# that it doesn't support unicode and use the ASCII bar.
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if not encoding:
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return fallback
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# Collect all of the possible characters we want to use with the preferred
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# bar.
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characters = [
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getattr(preferred, "empty_fill", six.text_type()),
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getattr(preferred, "fill", six.text_type()),
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]
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characters += list(getattr(preferred, "phases", []))
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# Try to decode the characters we're using for the bar using the encoding
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# of the given file, if this works then we'll assume that we can use the
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# fancier bar and if not we'll fall back to the plaintext bar.
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try:
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six.text_type().join(characters).encode(encoding)
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except UnicodeEncodeError:
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return fallback
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else:
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return preferred
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_BaseBar = _select_progress_class(IncrementalBar, Bar)
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class InterruptibleMixin(object):
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"""
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Helper to ensure that self.finish() gets called on keyboard interrupt.
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This allows downloads to be interrupted without leaving temporary state
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(like hidden cursors) behind.
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This class is similar to the progress library's existing SigIntMixin
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helper, but as of version 1.2, that helper has the following problems:
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1. It calls sys.exit().
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2. It discards the existing SIGINT handler completely.
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3. It leaves its own handler in place even after an uninterrupted finish,
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which will have unexpected delayed effects if the user triggers an
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unrelated keyboard interrupt some time after a progress-displaying
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download has already completed, for example.
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"""
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def __init__(self, *args, **kwargs):
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"""
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Save the original SIGINT handler for later.
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"""
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super(InterruptibleMixin, self).__init__(*args, **kwargs)
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self.original_handler = signal(SIGINT, self.handle_sigint)
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# If signal() returns None, the previous handler was not installed from
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# Python, and we cannot restore it. This probably should not happen,
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# but if it does, we must restore something sensible instead, at least.
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# The least bad option should be Python's default SIGINT handler, which
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# just raises KeyboardInterrupt.
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if self.original_handler is None:
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self.original_handler = default_int_handler
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def finish(self):
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"""
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Restore the original SIGINT handler after finishing.
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This should happen regardless of whether the progress display finishes
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normally, or gets interrupted.
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"""
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super(InterruptibleMixin, self).finish()
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signal(SIGINT, self.original_handler)
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def handle_sigint(self, signum, frame):
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"""
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Call self.finish() before delegating to the original SIGINT handler.
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This handler should only be in place while the progress display is
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active.
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"""
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self.finish()
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self.original_handler(signum, frame)
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class DownloadProgressMixin(object):
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def __init__(self, *args, **kwargs):
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super(DownloadProgressMixin, self).__init__(*args, **kwargs)
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self.message = (" " * (get_indentation() + 2)) + self.message
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@property
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def downloaded(self):
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return format_size(self.index)
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@property
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def download_speed(self):
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# Avoid zero division errors...
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if self.avg == 0.0:
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return "..."
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return format_size(1 / self.avg) + "/s"
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@property
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def pretty_eta(self):
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if self.eta:
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return "eta %s" % self.eta_td
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return ""
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def iter(self, it, n=1):
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for x in it:
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yield x
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self.next(n)
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self.finish()
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class WindowsMixin(object):
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def __init__(self, *args, **kwargs):
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# The Windows terminal does not support the hide/show cursor ANSI codes
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# even with colorama. So we'll ensure that hide_cursor is False on
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# Windows.
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# This call neds to go before the super() call, so that hide_cursor
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# is set in time. The base progress bar class writes the "hide cursor"
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# code to the terminal in its init, so if we don't set this soon
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# enough, we get a "hide" with no corresponding "show"...
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if WINDOWS and self.hide_cursor:
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self.hide_cursor = False
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super(WindowsMixin, self).__init__(*args, **kwargs)
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# Check if we are running on Windows and we have the colorama module,
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# if we do then wrap our file with it.
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if WINDOWS and colorama:
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self.file = colorama.AnsiToWin32(self.file)
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# The progress code expects to be able to call self.file.isatty()
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# but the colorama.AnsiToWin32() object doesn't have that, so we'll
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# add it.
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self.file.isatty = lambda: self.file.wrapped.isatty()
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# The progress code expects to be able to call self.file.flush()
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# but the colorama.AnsiToWin32() object doesn't have that, so we'll
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# add it.
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self.file.flush = lambda: self.file.wrapped.flush()
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class DownloadProgressBar(WindowsMixin, InterruptibleMixin,
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DownloadProgressMixin, _BaseBar):
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file = sys.stdout
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message = "%(percent)d%%"
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suffix = "%(downloaded)s %(download_speed)s %(pretty_eta)s"
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class DownloadProgressSpinner(WindowsMixin, InterruptibleMixin,
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DownloadProgressMixin, WritelnMixin, Spinner):
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file = sys.stdout
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suffix = "%(downloaded)s %(download_speed)s"
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def next_phase(self):
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if not hasattr(self, "_phaser"):
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self._phaser = itertools.cycle(self.phases)
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return next(self._phaser)
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def update(self):
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message = self.message % self
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phase = self.next_phase()
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suffix = self.suffix % self
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line = ''.join([
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message,
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" " if message else "",
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phase,
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" " if suffix else "",
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suffix,
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])
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self.writeln(line)
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################################################################
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# Generic "something is happening" spinners
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#
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# We don't even try using progress.spinner.Spinner here because it's actually
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# simpler to reimplement from scratch than to coerce their code into doing
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# what we need.
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################################################################
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@contextlib.contextmanager
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def hidden_cursor(file):
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# The Windows terminal does not support the hide/show cursor ANSI codes,
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# even via colorama. So don't even try.
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if WINDOWS:
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yield
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# We don't want to clutter the output with control characters if we're
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# writing to a file, or if the user is running with --quiet.
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# See https://github.com/pypa/pip/issues/3418
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elif not file.isatty() or logger.getEffectiveLevel() > logging.INFO:
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yield
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else:
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file.write(HIDE_CURSOR)
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try:
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yield
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finally:
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file.write(SHOW_CURSOR)
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class RateLimiter(object):
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def __init__(self, min_update_interval_seconds):
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self._min_update_interval_seconds = min_update_interval_seconds
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self._last_update = 0
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def ready(self):
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now = time.time()
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delta = now - self._last_update
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return delta >= self._min_update_interval_seconds
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def reset(self):
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self._last_update = time.time()
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class InteractiveSpinner(object):
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def __init__(self, message, file=None, spin_chars="-\\|/",
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# Empirically, 8 updates/second looks nice
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min_update_interval_seconds=0.125):
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self._message = message
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if file is None:
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file = sys.stdout
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self._file = file
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self._rate_limiter = RateLimiter(min_update_interval_seconds)
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self._finished = False
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self._spin_cycle = itertools.cycle(spin_chars)
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self._file.write(" " * get_indentation() + self._message + " ... ")
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self._width = 0
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def _write(self, status):
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assert not self._finished
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# Erase what we wrote before by backspacing to the beginning, writing
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# spaces to overwrite the old text, and then backspacing again
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backup = "\b" * self._width
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self._file.write(backup + " " * self._width + backup)
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# Now we have a blank slate to add our status
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self._file.write(status)
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self._width = len(status)
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self._file.flush()
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self._rate_limiter.reset()
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def spin(self):
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if self._finished:
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return
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if not self._rate_limiter.ready():
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return
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self._write(next(self._spin_cycle))
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def finish(self, final_status):
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if self._finished:
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return
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self._write(final_status)
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self._file.write("\n")
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self._file.flush()
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self._finished = True
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# Used for dumb terminals, non-interactive installs (no tty), etc.
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# We still print updates occasionally (once every 60 seconds by default) to
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# act as a keep-alive for systems like Travis-CI that take lack-of-output as
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# an indication that a task has frozen.
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class NonInteractiveSpinner(object):
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def __init__(self, message, min_update_interval_seconds=60):
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self._message = message
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self._finished = False
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self._rate_limiter = RateLimiter(min_update_interval_seconds)
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self._update("started")
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def _update(self, status):
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assert not self._finished
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self._rate_limiter.reset()
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logger.info("%s: %s", self._message, status)
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def spin(self):
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if self._finished:
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return
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if not self._rate_limiter.ready():
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return
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self._update("still running...")
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def finish(self, final_status):
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if self._finished:
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return
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self._update("finished with status '%s'" % (final_status,))
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self._finished = True
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@contextlib.contextmanager
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def open_spinner(message):
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# Interactive spinner goes directly to sys.stdout rather than being routed
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# through the logging system, but it acts like it has level INFO,
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# i.e. it's only displayed if we're at level INFO or better.
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# Non-interactive spinner goes through the logging system, so it is always
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# in sync with logging configuration.
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if sys.stdout.isatty() and logger.getEffectiveLevel() <= logging.INFO:
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spinner = InteractiveSpinner(message)
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else:
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spinner = NonInteractiveSpinner(message)
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try:
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with hidden_cursor(sys.stdout):
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yield spinner
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except KeyboardInterrupt:
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spinner.finish("canceled")
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raise
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except Exception:
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spinner.finish("error")
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raise
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else:
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spinner.finish("done")
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