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