diff options
Diffstat (limited to 'python')
| -rw-r--r-- | python/vyos/utils/convert.py | 145 | ||||
| -rw-r--r-- | python/vyos/utils/dict.py | 21 | ||||
| -rw-r--r-- | python/vyos/utils/file.py | 171 | ||||
| -rw-r--r-- | python/vyos/utils/io.py | 103 |
4 files changed, 440 insertions, 0 deletions
diff --git a/python/vyos/utils/convert.py b/python/vyos/utils/convert.py new file mode 100644 index 000000000..975c67e0a --- /dev/null +++ b/python/vyos/utils/convert.py @@ -0,0 +1,145 @@ +# 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/>. + +def seconds_to_human(s, separator=""): + """ Converts number of seconds passed to a human-readable + interval such as 1w4d18h35m59s + """ + s = int(s) + + week = 60 * 60 * 24 * 7 + day = 60 * 60 * 24 + hour = 60 * 60 + + remainder = 0 + result = "" + + weeks = s // week + if weeks > 0: + result = "{0}w".format(weeks) + s = s % week + + days = s // day + if days > 0: + result = "{0}{1}{2}d".format(result, separator, days) + s = s % day + + hours = s // hour + if hours > 0: + result = "{0}{1}{2}h".format(result, separator, hours) + s = s % hour + + minutes = s // 60 + if minutes > 0: + result = "{0}{1}{2}m".format(result, separator, minutes) + s = s % 60 + + seconds = s + if seconds > 0: + result = "{0}{1}{2}s".format(result, separator, seconds) + + return result + +def bytes_to_human(bytes, initial_exponent=0, precision=2): + """ Converts a value in bytes to a human-readable size string like 640 KB + + The initial_exponent parameter is the exponent of 2, + e.g. 10 (1024) for kilobytes, 20 (1024 * 1024) for megabytes. + """ + + if bytes == 0: + return "0 B" + + from math import log2 + + bytes = bytes * (2**initial_exponent) + + # log2 is a float, while range checking requires an int + exponent = int(log2(bytes)) + + if exponent < 10: + value = bytes + suffix = "B" + elif exponent in range(10, 20): + value = bytes / 1024 + suffix = "KB" + elif exponent in range(20, 30): + value = bytes / 1024**2 + suffix = "MB" + elif exponent in range(30, 40): + value = bytes / 1024**3 + suffix = "GB" + else: + value = bytes / 1024**4 + suffix = "TB" + # Add a new case when the first machine with petabyte RAM + # hits the market. + + size_string = "{0:.{1}f} {2}".format(value, precision, suffix) + return size_string + +def human_to_bytes(value): + """ Converts a data amount with a unit suffix to bytes, like 2K to 2048 """ + + from re import match as re_match + + res = re_match(r'^\s*(\d+(?:\.\d+)?)\s*([a-zA-Z]+)\s*$', value) + + if not res: + raise ValueError(f"'{value}' is not a valid data amount") + else: + amount = float(res.group(1)) + unit = res.group(2).lower() + + if unit == 'b': + res = amount + elif (unit == 'k') or (unit == 'kb'): + res = amount * 1024 + elif (unit == 'm') or (unit == 'mb'): + res = amount * 1024**2 + elif (unit == 'g') or (unit == 'gb'): + res = amount * 1024**3 + elif (unit == 't') or (unit == 'tb'): + res = amount * 1024**4 + else: + raise ValueError(f"Unsupported data unit '{unit}'") + + # There cannot be fractional bytes, so we convert them to integer. + # However, truncating causes problems with conversion back to human unit, + # so we round instead -- that seems to work well enough. + return round(res) + +def mac_to_eui64(mac, prefix=None): + """ + Convert a MAC address to a EUI64 address or, with prefix provided, a full + IPv6 address. + Thankfully copied from https://gist.github.com/wido/f5e32576bb57b5cc6f934e177a37a0d3 + """ + import re + from ipaddress import ip_network + # http://tools.ietf.org/html/rfc4291#section-2.5.1 + eui64 = re.sub(r'[.:-]', '', mac).lower() + eui64 = eui64[0:6] + 'fffe' + eui64[6:] + eui64 = hex(int(eui64[0:2], 16) ^ 2)[2:].zfill(2) + eui64[2:] + + if prefix is None: + return ':'.join(re.findall(r'.{4}', eui64)) + else: + try: + net = ip_network(prefix, strict=False) + euil = int('0x{0}'.format(eui64), 16) + return str(net[euil]) + except: # pylint: disable=bare-except + return diff --git a/python/vyos/utils/dict.py b/python/vyos/utils/dict.py index 66b40d92b..4afc9f54e 100644 --- a/python/vyos/utils/dict.py +++ b/python/vyos/utils/dict.py @@ -233,3 +233,24 @@ def dict_to_list(d, save_key_to=None): collect.append(item) return collect + +def check_mutually_exclusive_options(d, keys, required=False): + """ Checks if a dict has at most one or only one of + mutually exclusive keys. + """ + present_keys = [] + + for k in d: + if k in keys: + present_keys.append(k) + + # Un-mangle the keys to make them match CLI option syntax + from re import sub + orig_keys = list(map(lambda s: sub(r'_', '-', s), keys)) + orig_present_keys = list(map(lambda s: sub(r'_', '-', s), present_keys)) + + if len(present_keys) > 1: + raise ValueError(f"Options {orig_keys} are mutually-exclusive but more than one of them is present: {orig_present_keys}") + + if required and (len(present_keys) < 1): + raise ValueError(f"At least one of the following options is required: {orig_present_keys}") diff --git a/python/vyos/utils/file.py b/python/vyos/utils/file.py new file mode 100644 index 000000000..2560a35be --- /dev/null +++ b/python/vyos/utils/file.py @@ -0,0 +1,171 @@ +# 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 os + + +def read_file(fname, defaultonfailure=None): + """ + read the content of a file, stripping any end characters (space, newlines) + should defaultonfailure be not None, it is returned on failure to read + """ + try: + """ Read a file to string """ + with open(fname, 'r') as f: + data = f.read().strip() + return data + except Exception as e: + if defaultonfailure is not None: + return defaultonfailure + raise e + +def write_file(fname, data, defaultonfailure=None, user=None, group=None, mode=None, append=False): + """ + Write content of data to given fname, should defaultonfailure be not None, + it is returned on failure to read. + + If directory of file is not present, it is auto-created. + """ + dirname = os.path.dirname(fname) + if not os.path.isdir(dirname): + os.makedirs(dirname, mode=0o755, exist_ok=False) + chown(dirname, user, group) + + try: + """ Write a file to string """ + bytes = 0 + with open(fname, 'w' if not append else 'a') as f: + bytes = f.write(data) + chown(fname, user, group) + chmod(fname, mode) + return bytes + except Exception as e: + if defaultonfailure is not None: + return defaultonfailure + raise e + +def read_json(fname, defaultonfailure=None): + """ + read and json decode the content of a file + should defaultonfailure be not None, it is returned on failure to read + """ + import json + try: + with open(fname, 'r') as f: + data = json.load(f) + return data + except Exception as e: + if defaultonfailure is not None: + return defaultonfailure + raise e + +def chown(path, user, group): + """ change file/directory owner """ + from pwd import getpwnam + from grp import getgrnam + + if user is None or group is None: + return False + + # path may also be an open file descriptor + if not isinstance(path, int) and not os.path.exists(path): + return False + + uid = getpwnam(user).pw_uid + gid = getgrnam(group).gr_gid + os.chown(path, uid, gid) + return True + + +def chmod(path, bitmask): + # path may also be an open file descriptor + if not isinstance(path, int) and not os.path.exists(path): + return + if bitmask is None: + return + os.chmod(path, bitmask) + + +def chmod_600(path): + """ Make file only read/writable by owner """ + from stat import S_IRUSR, S_IWUSR + + bitmask = S_IRUSR | S_IWUSR + chmod(path, bitmask) + + +def chmod_750(path): + """ Make file/directory only executable to user and group """ + from stat import S_IRUSR, S_IWUSR, S_IXUSR, S_IRGRP, S_IXGRP + + bitmask = S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP + chmod(path, bitmask) + + +def chmod_755(path): + """ Make file executable by all """ + from stat import S_IRUSR, S_IWUSR, S_IXUSR, S_IRGRP, S_IXGRP, S_IROTH, S_IXOTH + + bitmask = S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | \ + S_IROTH | S_IXOTH + chmod(path, bitmask) + + +def makedir(path, user=None, group=None): + if os.path.exists(path): + return + os.makedirs(path, mode=0o755) + chown(path, user, group) + +def wait_for_inotify(file_path, pre_hook=None, event_type=None, timeout=None, sleep_interval=0.1): + """ Waits for an inotify event to occur """ + if not os.path.dirname(file_path): + raise ValueError( + "File path {} does not have a directory part (required for inotify watching)".format(file_path)) + if not os.path.basename(file_path): + raise ValueError( + "File path {} does not have a file part, do not know what to watch for".format(file_path)) + + from inotify.adapters import Inotify + from time import time + from time import sleep + + time_start = time() + + i = Inotify() + i.add_watch(os.path.dirname(file_path)) + + if pre_hook: + pre_hook() + + for event in i.event_gen(yield_nones=True): + if (timeout is not None) and ((time() - time_start) > timeout): + # If the function didn't return until this point, + # the file failed to have been written to and closed within the timeout + raise OSError("Waiting for file {} to be written has failed".format(file_path)) + + # Most such events don't take much time, so it's better to check right away + # and sleep later. + if event is not None: + (_, type_names, path, filename) = event + if filename == os.path.basename(file_path): + if event_type in type_names: + return + sleep(sleep_interval) + +def wait_for_file_write_complete(file_path, pre_hook=None, timeout=None, sleep_interval=0.1): + """ Waits for a process to close a file after opening it in write mode. """ + wait_for_inotify(file_path, + event_type='IN_CLOSE_WRITE', pre_hook=pre_hook, timeout=timeout, sleep_interval=sleep_interval) diff --git a/python/vyos/utils/io.py b/python/vyos/utils/io.py new file mode 100644 index 000000000..843494855 --- /dev/null +++ b/python/vyos/utils/io.py @@ -0,0 +1,103 @@ +# 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/>. + +def print_error(str='', end='\n'): + """ + Print `str` to stderr, terminated with `end`. + Used for warnings and out-of-band messages to avoid mangling precious + stdout output. + """ + import sys + sys.stderr.write(str) + 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: + question_out += f' (Default: {default})' + response = '' + while True: + response = input(question_out + ' ').strip() + if not response and default: + return default + if numeric_only: + if not response.isnumeric(): + print("Invalid value, try again.") + continue + response = int(response) + if valid_responses and response not in valid_responses: + print("Invalid value, try again.") + continue + break + return response + +def ask_yes_no(question, default=False) -> bool: + """Ask a yes/no question via input() and return their answer.""" + from sys import stdout + default_msg = "[Y/n]" if default else "[y/N]" + while True: + try: + stdout.write("%s %s " % (question, default_msg)) + c = input().lower() + if c == '': + return default + elif c in ("y", "ye", "yes"): + return True + elif c in ("n", "no"): + return False + else: + stdout.write("Please respond with yes/y or no/n\n") + except EOFError: + stdout.write("\nPlease respond with yes/y or no/n\n") |