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# (c) 2013, Jayson Vantuyl <jayson@aggressive.ly>
# (c) 2012-17 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = """
name: sequence
author: Jayson Vantuyl (!UNKNOWN) <jayson@aggressive.ly>
version_added: "1.0"
short_description: generate a list based on a number sequence
description:
- generates a sequence of items. You can specify a start value, an end value, an optional "stride" value that specifies the number of steps
to increment the sequence, and an optional printf-style format string.
- 'Arguments can be specified as key=value pair strings or as a shortcut form of the arguments string is also accepted: [start-]end[/stride][:format].'
- 'Numerical values can be specified in decimal, hexadecimal (0x3f8) or octal (0600).'
- Starting at version 1.9.2, negative strides are allowed.
- Generated items are strings. Use Jinja2 filters to convert items to preferred type, e.g. C({{ 1 + item|int }}).
- See also Jinja2 C(range) filter as an alternative.
options:
start:
description: number at which to start the sequence
default: 0
type: integer
end:
description: number at which to end the sequence, dont use this with count
type: integer
default: 0
count:
description: number of elements in the sequence, this is not to be used with end
type: integer
default: 0
stride:
description: increments between sequence numbers, the default is 1 unless the end is less than the start, then it is -1.
type: integer
format:
description: return a string with the generated number formatted in
"""
EXAMPLES = """
- name: create some test users
ansible.builtin.user:
name: "{{ item }}"
state: present
groups: "evens"
with_sequence: start=0 end=32 format=testuser%02x
- name: create a series of directories with even numbers for some reason
ansible.builtin.file:
dest: "/var/stuff/{{ item }}"
state: directory
with_sequence: start=4 end=16 stride=2
- name: a simpler way to use the sequence plugin create 4 groups
ansible.builtin.group:
name: "group{{ item }}"
state: present
with_sequence: count=4
- name: the final countdown
ansible.builtin.debug:
msg: "{{item}} seconds to detonation"
with_sequence: start=10 end=0 stride=-1
- name: Use of variable
ansible.builtin.debug:
msg: "{{ item }}"
with_sequence: start=1 end="{{ end_at }}"
vars:
- end_at: 10
"""
RETURN = """
_list:
description:
- A list containing generated sequence of items
type: list
elements: str
"""
from re import compile as re_compile, IGNORECASE
from ansible.errors import AnsibleError
from ansible.parsing.splitter import parse_kv
from ansible.plugins.lookup import LookupBase
# shortcut format
NUM = "(0?x?[0-9a-f]+)"
SHORTCUT = re_compile(
"^(" + # Group 0
NUM + # Group 1: Start
"-)?" +
NUM + # Group 2: End
"(/" + # Group 3
NUM + # Group 4: Stride
")?" +
"(:(.+))?$", # Group 5, Group 6: Format String
IGNORECASE
)
class LookupModule(LookupBase):
"""
sequence lookup module
Used to generate some sequence of items. Takes arguments in two forms.
The simple / shortcut form is:
[start-]end[/stride][:format]
As indicated by the brackets: start, stride, and format string are all
optional. The format string is in the style of printf. This can be used
to pad with zeros, format in hexadecimal, etc. All of the numerical values
can be specified in octal (i.e. 0664) or hexadecimal (i.e. 0x3f8).
Negative numbers are not supported.
Some examples:
5 -> ["1","2","3","4","5"]
5-8 -> ["5", "6", "7", "8"]
2-10/2 -> ["2", "4", "6", "8", "10"]
4:host%02d -> ["host01","host02","host03","host04"]
The standard Ansible key-value form is accepted as well. For example:
start=5 end=11 stride=2 format=0x%02x -> ["0x05","0x07","0x09","0x0a"]
This format takes an alternate form of "end" called "count", which counts
some number from the starting value. For example:
count=5 -> ["1", "2", "3", "4", "5"]
start=0x0f00 count=4 format=%04x -> ["0f00", "0f01", "0f02", "0f03"]
start=0 count=5 stride=2 -> ["0", "2", "4", "6", "8"]
start=1 count=5 stride=2 -> ["1", "3", "5", "7", "9"]
The count option is mostly useful for avoiding off-by-one errors and errors
calculating the number of entries in a sequence when a stride is specified.
"""
def reset(self):
"""set sensible defaults"""
self.start = 1
self.count = None
self.end = None
self.stride = 1
self.format = "%d"
def parse_kv_args(self, args):
"""parse key-value style arguments"""
for arg in ["start", "end", "count", "stride"]:
try:
arg_raw = args.pop(arg, None)
if arg_raw is None:
continue
arg_cooked = int(arg_raw, 0)
setattr(self, arg, arg_cooked)
except ValueError:
raise AnsibleError(
"can't parse %s=%s as integer"
% (arg, arg_raw)
)
if 'format' in args:
self.format = args.pop("format")
if args:
raise AnsibleError(
"unrecognized arguments to with_sequence: %s"
% list(args.keys())
)
def parse_simple_args(self, term):
"""parse the shortcut forms, return True/False"""
match = SHORTCUT.match(term)
if not match:
return False
_, start, end, _, stride, _, format = match.groups()
if start is not None:
try:
start = int(start, 0)
except ValueError:
raise AnsibleError("can't parse start=%s as integer" % start)
if end is not None:
try:
end = int(end, 0)
except ValueError:
raise AnsibleError("can't parse end=%s as integer" % end)
if stride is not None:
try:
stride = int(stride, 0)
except ValueError:
raise AnsibleError("can't parse stride=%s as integer" % stride)
if start is not None:
self.start = start
if end is not None:
self.end = end
if stride is not None:
self.stride = stride
if format is not None:
self.format = format
return True
def sanity_check(self):
if self.count is None and self.end is None:
raise AnsibleError("must specify count or end in with_sequence")
elif self.count is not None and self.end is not None:
raise AnsibleError("can't specify both count and end in with_sequence")
elif self.count is not None:
# convert count to end
if self.count != 0:
self.end = self.start + self.count * self.stride - 1
else:
self.start = 0
self.end = 0
self.stride = 0
del self.count
if self.stride > 0 and self.end < self.start:
raise AnsibleError("to count backwards make stride negative")
if self.stride < 0 and self.end > self.start:
raise AnsibleError("to count forward don't make stride negative")
if self.format.count('%') != 1:
raise AnsibleError("bad formatting string: %s" % self.format)
def generate_sequence(self):
if self.stride >= 0:
adjust = 1
else:
adjust = -1
numbers = range(self.start, self.end + adjust, self.stride)
for i in numbers:
try:
formatted = self.format % i
yield formatted
except (ValueError, TypeError):
raise AnsibleError(
"problem formatting %r with %r" % (i, self.format)
)
def run(self, terms, variables, **kwargs):
results = []
for term in terms:
try:
self.reset() # clear out things for this iteration
try:
if not self.parse_simple_args(term):
self.parse_kv_args(parse_kv(term))
except AnsibleError:
raise
except Exception as e:
raise AnsibleError("unknown error parsing with_sequence arguments: %r. Error was: %s" % (term, e))
self.sanity_check()
if self.stride != 0:
results.extend(self.generate_sequence())
except AnsibleError:
raise
except Exception as e:
raise AnsibleError(
"unknown error generating sequence: %s" % e
)
return results
|
