diff options
| -rw-r--r-- | python/vyos/progressbar.py | 70 | ||||
| -rw-r--r-- | python/vyos/remote.py | 44 | ||||
| -rw-r--r-- | python/vyos/utils/io.py | 39 |
3 files changed, 93 insertions, 60 deletions
diff --git a/python/vyos/progressbar.py b/python/vyos/progressbar.py new file mode 100644 index 000000000..1793c445b --- /dev/null +++ b/python/vyos/progressbar.py @@ -0,0 +1,70 @@ +# Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io> +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library. If not, see <http://www.gnu.org/licenses/>. + +import math +import os +import signal +import subprocess +import sys + +from vyos.utils.io import print_error + +class Progressbar: + def __init__(self, step=None): + self.total = 0.0 + self.step = step + def __enter__(self): + # Recalculate terminal width with every window resize. + signal.signal(signal.SIGWINCH, lambda signum, frame: self._update_cols()) + # Disable line wrapping to prevent the staircase effect. + subprocess.run(['tput', 'rmam'], check=False) + self._update_cols() + # Print an empty progressbar with entry. + self.progress(0, 1) + return self + def __exit__(self, exc_type, kexc_val, exc_tb): + # Revert to the default SIGWINCH handler (ie nothing). + signal.signal(signal.SIGWINCH, signal.SIG_DFL) + # Reenable line wrapping. + subprocess.run(['tput', 'smam'], check=False) + def _update_cols(self): + # `os.get_terminal_size()' is fast enough for our purposes. + self.col = max(os.get_terminal_size().columns - 15, 20) + def increment(self): + """ + Stateful progressbar taking the step fraction at init and no input at + callback (for FTP) + """ + if self.step: + if self.total < 1.0: + self.total += self.step + if self.total >= 1.0: + self.total = 1.0 + # Ignore superfluous calls caused by fuzzy FTP size calculations. + self.step = None + self.progress(self.total, 1.0) + def progress(self, done, total): + """ + Stateless progressbar taking no input at init and current progress with + final size at callback (for SSH) + """ + if done <= total: + length = math.ceil(self.col * done / total) + percentage = str(math.ceil(100 * done / total)).rjust(3) + # Carriage return at the end will make sure the line will get overwritten. + print_error(f'[{length * "#"}{(self.col - length) * "_"}] {percentage}%', end='\r') + # Print a newline to make sure the full progressbar doesn't get overwritten by the next line. + if done == total: + print_error() diff --git a/python/vyos/remote.py b/python/vyos/remote.py index cf731c881..1ca8a9530 100644 --- a/python/vyos/remote.py +++ b/python/vyos/remote.py @@ -32,9 +32,8 @@ from requests import Session from requests.adapters import HTTPAdapter from requests.packages.urllib3 import PoolManager +from vyos.progressbar import Progressbar from vyos.utils.io import ask_yes_no -from vyos.utils.io import make_incremental_progressbar -from vyos.utils.io import make_progressbar from vyos.utils.io import print_error from vyos.utils.misc import begin from vyos.utils.process import cmd @@ -131,16 +130,16 @@ class FtpC: if self.secure: conn.prot_p() # Almost all FTP servers support the `SIZE' command. + size = conn.size(self.path) if self.check_space: - check_storage(path, conn.size(self.path)) + check_storage(path, size) # No progressbar if we can't determine the size or if the file is too small. if self.progressbar and size and size > CHUNK_SIZE: - progress = make_incremental_progressbar(CHUNK_SIZE / size) - next(progress) - callback = lambda block: begin(f.write(block), next(progress)) + with Progressbar(CHUNK_SIZE / size) as p: + callback = lambda block: begin(f.write(block), p.increment()) + conn.retrbinary('RETR ' + self.path, callback, CHUNK_SIZE) else: - callback = f.write - conn.retrbinary('RETR ' + self.path, callback, CHUNK_SIZE) + conn.retrbinary('RETR ' + self.path, f.write, CHUNK_SIZE) def upload(self, location: str): size = os.path.getsize(location) @@ -150,12 +149,10 @@ class FtpC: if self.secure: conn.prot_p() if self.progressbar and size and size > CHUNK_SIZE: - progress = make_incremental_progressbar(CHUNK_SIZE / size) - next(progress) - callback = lambda block: next(progress) + with Progressbar(CHUNK_SIZE / size) as p: + conn.storbinary('STOR ' + self.path, f, CHUNK_SIZE, lambda block: p.increment()) else: - callback = None - conn.storbinary('STOR ' + self.path, f, CHUNK_SIZE, callback) + conn.storbinary('STOR ' + self.path, f, CHUNK_SIZE) class SshC: known_hosts = os.path.expanduser('~/.ssh/known_hosts') @@ -190,14 +187,16 @@ class SshC: return ssh def download(self, location: str): - callback = make_progressbar() if self.progressbar else None with self._establish() as ssh, ssh.open_sftp() as sftp: if self.check_space: check_storage(location, sftp.stat(self.path).st_size) - sftp.get(self.path, location, callback=callback) + if self.progressbar: + with Progressbar() as p: + sftp.get(self.path, location, callback=p.progress) + else: + sftp.get(self.path, location) def upload(self, location: str): - callback = make_progressbar() if self.progressbar else None with self._establish() as ssh, ssh.open_sftp() as sftp: try: # If the remote path is a directory, use the original filename. @@ -210,7 +209,11 @@ class SshC: except IOError: path = self.path finally: - sftp.put(location, path, callback=callback) + if self.progressbar: + with Progressbar() as p: + sftp.put(location, path, callback=p.progress) + else: + sftp.put(location, path) class HttpC: @@ -264,10 +267,9 @@ class HttpC: with s.get(final_urlstring, stream=True, timeout=self.timeout) as r, open(location, 'wb') as f: if self.progressbar and size: - progress = make_incremental_progressbar(CHUNK_SIZE / size) - next(progress) - for chunk in iter(lambda: begin(next(progress), r.raw.read(CHUNK_SIZE)), b''): - f.write(chunk) + with Progressbar(CHUNK_SIZE / size) as p: + for chunk in iter(lambda: begin(p.increment(), r.raw.read(CHUNK_SIZE)), b''): + f.write(chunk) else: # We'll try to stream the download directly with `copyfileobj()` so that large # files (like entire VyOS images) don't occupy much memory. diff --git a/python/vyos/utils/io.py b/python/vyos/utils/io.py index 843494855..5fffa62f8 100644 --- a/python/vyos/utils/io.py +++ b/python/vyos/utils/io.py @@ -24,45 +24,6 @@ def print_error(str='', end='\n'): sys.stderr.write(end) sys.stderr.flush() -def make_progressbar(): - """ - Make a procedure that takes two arguments `done` and `total` and prints a - progressbar based on the ratio thereof, whose length is determined by the - width of the terminal. - """ - import shutil, math - col, _ = shutil.get_terminal_size() - col = max(col - 15, 20) - def print_progressbar(done, total): - if done <= total: - increment = total / col - length = math.ceil(done / increment) - percentage = str(math.ceil(100 * done / total)).rjust(3) - print_error(f'[{length * "#"}{(col - length) * "_"}] {percentage}%', '\r') - # Print a newline so that the subsequent prints don't overwrite the full bar. - if done == total: - print_error() - return print_progressbar - -def make_incremental_progressbar(increment: float): - """ - Make a generator that displays a progressbar that grows monotonically with - every iteration. - First call displays it at 0% and every subsequent iteration displays it - at `increment` increments where 0.0 < `increment` < 1.0. - Intended for FTP and HTTP transfers with stateless callbacks. - """ - print_progressbar = make_progressbar() - total = 0.0 - while total < 1.0: - print_progressbar(total, 1.0) - yield - total += increment - print_progressbar(1, 1) - # Ignore further calls. - while True: - yield - def ask_input(question, default='', numeric_only=False, valid_responses=[]): question_out = question if default: |