157 lines
5 KiB
Python
157 lines
5 KiB
Python
import contextlib
|
|
import itertools
|
|
import logging
|
|
import sys
|
|
import time
|
|
from typing import IO, Iterator
|
|
|
|
from pip._vendor.progress import HIDE_CURSOR, SHOW_CURSOR
|
|
|
|
from pip._internal.utils.compat import WINDOWS
|
|
from pip._internal.utils.logging import get_indentation
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class SpinnerInterface:
|
|
def spin(self) -> None:
|
|
raise NotImplementedError()
|
|
|
|
def finish(self, final_status: str) -> None:
|
|
raise NotImplementedError()
|
|
|
|
|
|
class InteractiveSpinner(SpinnerInterface):
|
|
def __init__(
|
|
self,
|
|
message: str,
|
|
file: IO[str] = None,
|
|
spin_chars: str = "-\\|/",
|
|
# Empirically, 8 updates/second looks nice
|
|
min_update_interval_seconds: float = 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: str) -> None:
|
|
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) -> None:
|
|
if self._finished:
|
|
return
|
|
if not self._rate_limiter.ready():
|
|
return
|
|
self._write(next(self._spin_cycle))
|
|
|
|
def finish(self, final_status: str) -> None:
|
|
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(SpinnerInterface):
|
|
def __init__(self, message: str, min_update_interval_seconds: float = 60.0) -> None:
|
|
self._message = message
|
|
self._finished = False
|
|
self._rate_limiter = RateLimiter(min_update_interval_seconds)
|
|
self._update("started")
|
|
|
|
def _update(self, status: str) -> None:
|
|
assert not self._finished
|
|
self._rate_limiter.reset()
|
|
logger.info("%s: %s", self._message, status)
|
|
|
|
def spin(self) -> None:
|
|
if self._finished:
|
|
return
|
|
if not self._rate_limiter.ready():
|
|
return
|
|
self._update("still running...")
|
|
|
|
def finish(self, final_status: str) -> None:
|
|
if self._finished:
|
|
return
|
|
self._update(f"finished with status '{final_status}'")
|
|
self._finished = True
|
|
|
|
|
|
class RateLimiter:
|
|
def __init__(self, min_update_interval_seconds: float) -> None:
|
|
self._min_update_interval_seconds = min_update_interval_seconds
|
|
self._last_update: float = 0
|
|
|
|
def ready(self) -> bool:
|
|
now = time.time()
|
|
delta = now - self._last_update
|
|
return delta >= self._min_update_interval_seconds
|
|
|
|
def reset(self) -> None:
|
|
self._last_update = time.time()
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def open_spinner(message: str) -> Iterator[SpinnerInterface]:
|
|
# 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: SpinnerInterface = 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")
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def hidden_cursor(file: IO[str]) -> Iterator[None]:
|
|
# 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)
|