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Commit 7fcffe27 authored by Michael Hanselmann's avatar Michael Hanselmann
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utils: Move text-related functions into separate file 


Signed-off-by: default avatarMichael Hanselmann <hansmi@google.com>
Reviewed-by: default avatarIustin Pop <iustin@google.com>
parent 79d22269
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Makefile.am
View file @ 7fcffe27
......@@ -214,7 +214,8 @@ server_PYTHON = \
utils_PYTHON = \
lib/utils/__init__.py \
lib/utils/algo.py \
lib/utils/retry.py
lib/utils/retry.py \
lib/utils/text.py
docrst = \
doc/admin.rst \
......@@ -482,6 +483,7 @@ python_tests = \
test/ganeti.uidpool_unittest.py \
test/ganeti.utils.algo_unittest.py \
test/ganeti.utils.retry_unittest.py \
test/ganeti.utils.text_unittest.py \
test/ganeti.utils_mlockall_unittest.py \
test/ganeti.utils_unittest.py \
test/ganeti.workerpool_unittest.py \
......
lib/utils/__init__.py
View file @ 7fcffe27
......@@ -48,7 +48,6 @@ import OpenSSL
import datetime
import calendar
import hmac
import collections
from cStringIO import StringIO
......@@ -64,9 +63,9 @@ from ganeti import compat
from ganeti.utils.algo import * # pylint: disable-msg=W0401
from ganeti.utils.retry import * # pylint: disable-msg=W0401
from ganeti.utils.text import * # pylint: disable-msg=W0401
_locksheld = []
_re_shell_unquoted = re.compile('^[-.,=:/_+@A-Za-z0-9]+$')
debug_locks = False
......@@ -95,9 +94,6 @@ UUID_RE = re.compile('^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-'
_MCL_CURRENT = 1
_MCL_FUTURE = 2
#: MAC checker regexp
_MAC_CHECK = re.compile("^([0-9a-f]{2}:){5}[0-9a-f]{2}$", re.I)
(_TIMEOUT_NONE,
_TIMEOUT_TERM,
_TIMEOUT_KILL) = range(3)
......@@ -105,9 +101,6 @@ _MAC_CHECK = re.compile("^([0-9a-f]{2}:){5}[0-9a-f]{2}$", re.I)
#: Shell param checker regexp
_SHELLPARAM_REGEX = re.compile(r"^[-a-zA-Z0-9._+/:%@]+$")
#: Unit checker regexp
_PARSEUNIT_REGEX = re.compile(r"^([.\d]+)\s*([a-zA-Z]+)?$")
#: ASN1 time regexp
_ASN1_TIME_REGEX = re.compile(r"^(\d+)([-+]\d\d)(\d\d)$")
......@@ -1171,52 +1164,6 @@ def ReadLockedPidFile(path):
return None
def MatchNameComponent(key, name_list, case_sensitive=True):
"""Try to match a name against a list.
This function will try to match a name like test1 against a list
like C{['test1.example.com', 'test2.example.com', ...]}. Against
this list, I{'test1'} as well as I{'test1.example'} will match, but
not I{'test1.ex'}. A multiple match will be considered as no match
at all (e.g. I{'test1'} against C{['test1.example.com',
'test1.example.org']}), except when the key fully matches an entry
(e.g. I{'test1'} against C{['test1', 'test1.example.com']}).
@type key: str
@param key: the name to be searched
@type name_list: list
@param name_list: the list of strings against which to search the key
@type case_sensitive: boolean
@param case_sensitive: whether to provide a case-sensitive match
@rtype: None or str
@return: None if there is no match I{or} if there are multiple matches,
otherwise the element from the list which matches
"""
if key in name_list:
return key
re_flags = 0
if not case_sensitive:
re_flags |= re.IGNORECASE
key = key.upper()
mo = re.compile("^%s(\..*)?$" % re.escape(key), re_flags)
names_filtered = []
string_matches = []
for name in name_list:
if mo.match(name) is not None:
names_filtered.append(name)
if not case_sensitive and key == name.upper():
string_matches.append(name)
if len(string_matches) == 1:
return string_matches[0]
if len(names_filtered) == 1:
return names_filtered[0]
return None
def ValidateServiceName(name):
"""Validate the given service name.
......@@ -1344,87 +1291,6 @@ def BuildShellCmd(template, *args):
return template % args
def FormatUnit(value, units):
"""Formats an incoming number of MiB with the appropriate unit.
@type value: int
@param value: integer representing the value in MiB (1048576)
@type units: char
@param units: the type of formatting we should do:
- 'h' for automatic scaling
- 'm' for MiBs
- 'g' for GiBs
- 't' for TiBs
@rtype: str
@return: the formatted value (with suffix)
"""
if units not in ('m', 'g', 't', 'h'):
raise errors.ProgrammerError("Invalid unit specified '%s'" % str(units))
suffix = ''
if units == 'm' or (units == 'h' and value < 1024):
if units == 'h':
suffix = 'M'
return "%d%s" % (round(value, 0), suffix)
elif units == 'g' or (units == 'h' and value < (1024 * 1024)):
if units == 'h':
suffix = 'G'
return "%0.1f%s" % (round(float(value) / 1024, 1), suffix)
else:
if units == 'h':
suffix = 'T'
return "%0.1f%s" % (round(float(value) / 1024 / 1024, 1), suffix)
def ParseUnit(input_string):
"""Tries to extract number and scale from the given string.
Input must be in the format C{NUMBER+ [DOT NUMBER+] SPACE*
[UNIT]}. If no unit is specified, it defaults to MiB. Return value
is always an int in MiB.
"""
m = _PARSEUNIT_REGEX.match(str(input_string))
if not m:
raise errors.UnitParseError("Invalid format")
value = float(m.groups()[0])
unit = m.groups()[1]
if unit:
lcunit = unit.lower()
else:
lcunit = 'm'
if lcunit in ('m', 'mb', 'mib'):
# Value already in MiB
pass
elif lcunit in ('g', 'gb', 'gib'):
value *= 1024
elif lcunit in ('t', 'tb', 'tib'):
value *= 1024 * 1024
else:
raise errors.UnitParseError("Unknown unit: %s" % unit)
# Make sure we round up
if int(value) < value:
value += 1
# Round up to the next multiple of 4
value = int(value)
if value % 4:
value += 4 - value % 4
return value
def ParseCpuMask(cpu_mask):
"""Parse a CPU mask definition and return the list of CPU IDs.
......@@ -1673,75 +1539,6 @@ def CreateBackup(file_name):
return backup_name
def ShellQuote(value):
"""Quotes shell argument according to POSIX.
@type value: str
@param value: the argument to be quoted
@rtype: str
@return: the quoted value
"""
if _re_shell_unquoted.match(value):
return value
else:
return "'%s'" % value.replace("'", "'\\''")
def ShellQuoteArgs(args):
"""Quotes a list of shell arguments.
@type args: list
@param args: list of arguments to be quoted
@rtype: str
@return: the quoted arguments concatenated with spaces
"""
return ' '.join([ShellQuote(i) for i in args])
class ShellWriter:
"""Helper class to write scripts with indentation.
"""
INDENT_STR = " "
def __init__(self, fh):
"""Initializes this class.
"""
self._fh = fh
self._indent = 0
def IncIndent(self):
"""Increase indentation level by 1.
"""
self._indent += 1
def DecIndent(self):
"""Decrease indentation level by 1.
"""
assert self._indent > 0
self._indent -= 1
def Write(self, txt, *args):
"""Write line to output file.
"""
assert self._indent >= 0
self._fh.write(self._indent * self.INDENT_STR)
if args:
self._fh.write(txt % args)
else:
self._fh.write(txt)
self._fh.write("\n")
def ListVisibleFiles(path):
"""Returns a list of visible files in a directory.
......@@ -1791,21 +1588,6 @@ def NewUUID():
return ReadFile(_RANDOM_UUID_FILE, size=128).rstrip("\n")
def GenerateSecret(numbytes=20):
"""Generates a random secret.
This will generate a pseudo-random secret returning an hex string
(so that it can be used where an ASCII string is needed).
@param numbytes: the number of bytes which will be represented by the returned
string (defaulting to 20, the length of a SHA1 hash)
@rtype: str
@return: an hex representation of the pseudo-random sequence
"""
return os.urandom(numbytes).encode('hex')
def EnsureDirs(dirs):
"""Make required directories, if they don't exist.
......@@ -2146,27 +1928,6 @@ def WaitForFdCondition(fdobj, event, timeout):
return result
def NormalizeAndValidateMac(mac):
"""Normalizes and check if a MAC address is valid.
Checks whether the supplied MAC address is formally correct, only
accepts colon separated format. Normalize it to all lower.
@type mac: str
@param mac: the MAC to be validated
@rtype: str
@return: returns the normalized and validated MAC.
@raise errors.OpPrereqError: If the MAC isn't valid
"""
if not _MAC_CHECK.match(mac):
raise errors.OpPrereqError("Invalid MAC address specified: %s" %
mac, errors.ECODE_INVAL)
return mac.lower()
def TestDelay(duration):
"""Sleep for a fixed amount of time.
......@@ -2985,95 +2746,6 @@ def VerifySha1Hmac(key, text, digest, salt=None):
return digest.lower() == Sha1Hmac(key, text, salt=salt).lower()
def SafeEncode(text):
"""Return a 'safe' version of a source string.
This function mangles the input string and returns a version that
should be safe to display/encode as ASCII. To this end, we first
convert it to ASCII using the 'backslashreplace' encoding which
should get rid of any non-ASCII chars, and then we process it
through a loop copied from the string repr sources in the python; we
don't use string_escape anymore since that escape single quotes and
backslashes too, and that is too much; and that escaping is not
stable, i.e. string_escape(string_escape(x)) != string_escape(x).
@type text: str or unicode
@param text: input data
@rtype: str
@return: a safe version of text
"""
if isinstance(text, unicode):
# only if unicode; if str already, we handle it below
text = text.encode('ascii', 'backslashreplace')
resu = ""
for char in text:
c = ord(char)
if char == '\t':
resu += r'\t'
elif char == '\n':
resu += r'\n'
elif char == '\r':
resu += r'\'r'
elif c < 32 or c >= 127: # non-printable
resu += "\\x%02x" % (c & 0xff)
else:
resu += char
return resu
def UnescapeAndSplit(text, sep=","):
"""Split and unescape a string based on a given separator.
This function splits a string based on a separator where the
separator itself can be escape in order to be an element of the
elements. The escaping rules are (assuming coma being the
separator):
- a plain , separates the elements
- a sequence \\\\, (double backslash plus comma) is handled as a
backslash plus a separator comma
- a sequence \, (backslash plus comma) is handled as a
non-separator comma
@type text: string
@param text: the string to split
@type sep: string
@param text: the separator
@rtype: string
@return: a list of strings
"""
# we split the list by sep (with no escaping at this stage)
slist = text.split(sep)
# next, we revisit the elements and if any of them ended with an odd
# number of backslashes, then we join it with the next
rlist = []
while slist:
e1 = slist.pop(0)
if e1.endswith("\\"):
num_b = len(e1) - len(e1.rstrip("\\"))
if num_b % 2 == 1:
e2 = slist.pop(0)
# here the backslashes remain (all), and will be reduced in
# the next step
rlist.append(e1 + sep + e2)
continue
rlist.append(e1)
# finally, replace backslash-something with something
rlist = [re.sub(r"\\(.)", r"\1", v) for v in rlist]
return rlist
def CommaJoin(names):
"""Nicely join a set of identifiers.
@param names: set, list or tuple
@return: a string with the formatted results
"""
return ", ".join([str(val) for val in names])
def FindMatch(data, name):
"""Tries to find an item in a dictionary matching a name.
......@@ -3270,47 +2942,6 @@ def LockFile(fd):
raise
def FormatTime(val):
"""Formats a time value.
@type val: float or None
@param val: Timestamp as returned by time.time() (seconds since Epoch,
1970-01-01 00:00:00 UTC)
@return: a string value or N/A if we don't have a valid timestamp
"""
if val is None or not isinstance(val, (int, float)):
return "N/A"
# these two codes works on Linux, but they are not guaranteed on all
# platforms
return time.strftime("%F %T", time.localtime(val))
def FormatSeconds(secs):
"""Formats seconds for easier reading.
@type secs: number
@param secs: Number of seconds
@rtype: string
@return: Formatted seconds (e.g. "2d 9h 19m 49s")
"""
parts = []
secs = round(secs, 0)
if secs > 0:
# Negative values would be a bit tricky
for unit, one in [("d", 24 * 60 * 60), ("h", 60 * 60), ("m", 60)]:
(complete, secs) = divmod(secs, one)
if complete or parts:
parts.append("%d%s" % (complete, unit))
parts.append("%ds" % secs)
return " ".join(parts)
def ReadWatcherPauseFile(filename, now=None, remove_after=3600):
"""Reads the watcher pause file.
......@@ -3547,47 +3178,6 @@ class FileLock(object):
"Failed to unlock %s" % self.filename)
class LineSplitter:
"""Splits data chunks into lines separated by newline.
Instances provide a file-like interface.
"""
def __init__(self, line_fn, *args):
"""Initializes this class.
@type line_fn: callable
@param line_fn: Function called for each line, first parameter is line
@param args: Extra arguments for L{line_fn}
"""
assert callable(line_fn)
if args:
# Python 2.4 doesn't have functools.partial yet
self._line_fn = \
lambda line: line_fn(line, *args) # pylint: disable-msg=W0142
else:
self._line_fn = line_fn
self._lines = collections.deque()
self._buffer = ""
def write(self, data):
parts = (self._buffer + data).split("\n")
self._buffer = parts.pop()
self._lines.extend(parts)
def flush(self):
while self._lines:
self._line_fn(self._lines.popleft().rstrip("\r\n"))
def close(self):
self.flush()
if self._buffer:
self._line_fn(self._buffer)
def SignalHandled(signums):
"""Signal Handled decoration.
......
lib/utils/text.py 0 → 100644
View file @ 7fcffe27
#
#
# Copyright (C) 2006, 2007, 2010, 2011 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
"""Utility functions for manipulating or working with text.
"""
import re
import os
import time
import collections
from ganeti import errors
#: Unit checker regexp
_PARSEUNIT_REGEX = re.compile(r"^([.\d]+)\s*([a-zA-Z]+)?$")
#: Characters which don't need to be quoted for shell commands
_SHELL_UNQUOTED_RE = re.compile('^[-.,=:/_+@A-Za-z0-9]+$')
#: MAC checker regexp
_MAC_CHECK_RE = re.compile("^([0-9a-f]{2}:){5}[0-9a-f]{2}$", re.I)
def MatchNameComponent(key, name_list, case_sensitive=True):
"""Try to match a name against a list.
This function will try to match a name like test1 against a list
like C{['test1.example.com', 'test2.example.com', ...]}. Against
this list, I{'test1'} as well as I{'test1.example'} will match, but
not I{'test1.ex'}. A multiple match will be considered as no match
at all (e.g. I{'test1'} against C{['test1.example.com',
'test1.example.org']}), except when the key fully matches an entry
(e.g. I{'test1'} against C{['test1', 'test1.example.com']}).
@type key: str
@param key: the name to be searched
@type name_list: list
@param name_list: the list of strings against which to search the key
@type case_sensitive: boolean
@param case_sensitive: whether to provide a case-sensitive match
@rtype: None or str
@return: None if there is no match I{or} if there are multiple matches,
otherwise the element from the list which matches
"""
if key in name_list:
return key
re_flags = 0
if not case_sensitive:
re_flags |= re.IGNORECASE
key = key.upper()
mo = re.compile("^%s(\..*)?$" % re.escape(key), re_flags)
names_filtered = []
string_matches = []
for name in name_list:
if mo.match(name) is not None:
names_filtered.append(name)
if not case_sensitive and key == name.upper():
string_matches.append(name)
if len(string_matches) == 1:
return string_matches[0]
if len(names_filtered) == 1:
return names_filtered[0]
return None
def FormatUnit(value, units):
"""Formats an incoming number of MiB with the appropriate unit.
@type value: int
@param value: integer representing the value in MiB (1048576)
@type units: char
@param units: the type of formatting we should do:
- 'h' for automatic scaling
- 'm' for MiBs
- 'g' for GiBs
- 't' for TiBs
@rtype: str
@return: the formatted value (with suffix)
"""
if units not in ('m', 'g', 't', 'h'):
raise errors.ProgrammerError("Invalid unit specified '%s'" % str(units))
suffix = ''
if units == 'm' or (units == 'h' and value < 1024):
if units == 'h':
suffix = 'M'
return "%d%s" % (round(value, 0), suffix)
elif units == 'g' or (units == 'h' and value < (1024 * 1024)):
if units == 'h':
suffix = 'G'
return "%0.1f%s" % (round(float(value) / 1024, 1), suffix)
else:
if units == 'h':
suffix = 'T'