mg
c648a48c4c
Co-authored-by: Michael Grote <michael.grote@posteo.de> Reviewed-on: mg/ansible#346 Co-authored-by: mg <michael.grote@posteo.de> Co-committed-by: mg <michael.grote@posteo.de>
122 lines
3.6 KiB
Python
122 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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# (c) 2017-2018, Jan-Piet Mens <jpmens(at)gmail.com>
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# (c) 2018 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = '''
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name: lmdb_kv
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author:
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- Jan-Piet Mens (@jpmens)
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version_added: '0.2.0'
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short_description: fetch data from LMDB
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description:
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- This lookup returns a list of results from an LMDB DB corresponding to a list of items given to it
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requirements:
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- lmdb (python library https://lmdb.readthedocs.io/en/release/)
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options:
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_terms:
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description: list of keys to query
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db:
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description: path to LMDB database
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default: 'ansible.mdb'
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'''
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EXAMPLES = """
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- name: query LMDB for a list of country codes
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ansible.builtin.debug:
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msg: "{{ query('community.general.lmdb_kv', 'nl', 'be', 'lu', db='jp.mdb') }}"
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- name: use list of values in a loop by key wildcard
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ansible.builtin.debug:
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msg: "Hello from {{ item.0 }} a.k.a. {{ item.1 }}"
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vars:
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- lmdb_kv_db: jp.mdb
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with_community.general.lmdb_kv:
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- "n*"
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- name: get an item by key
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ansible.builtin.assert:
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that:
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- item == 'Belgium'
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vars:
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- lmdb_kv_db: jp.mdb
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with_community.general.lmdb_kv:
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- be
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"""
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RETURN = """
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_raw:
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description: value(s) stored in LMDB
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type: list
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elements: raw
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"""
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from ansible.errors import AnsibleError
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from ansible.plugins.lookup import LookupBase
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from ansible.module_utils.common.text.converters import to_native, to_text
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HAVE_LMDB = True
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try:
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import lmdb
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except ImportError:
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HAVE_LMDB = False
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class LookupModule(LookupBase):
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def run(self, terms, variables, **kwargs):
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'''
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terms contain any number of keys to be retrieved.
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If terms is None, all keys from the database are returned
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with their values, and if term ends in an asterisk, we
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start searching there
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The LMDB database defaults to 'ansible.mdb' if Ansible's
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variable 'lmdb_kv_db' is not set:
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vars:
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- lmdb_kv_db: "jp.mdb"
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'''
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if HAVE_LMDB is False:
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raise AnsibleError("Can't LOOKUP(lmdb_kv): this module requires lmdb to be installed")
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db = variables.get('lmdb_kv_db', None)
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if db is None:
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db = kwargs.get('db', 'ansible.mdb')
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db = str(db)
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try:
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env = lmdb.open(db, readonly=True)
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except Exception as e:
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raise AnsibleError("LMDB can't open database %s: %s" % (db, to_native(e)))
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ret = []
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if len(terms) == 0:
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with env.begin() as txn:
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cursor = txn.cursor()
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cursor.first()
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for key, value in cursor:
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ret.append((to_text(key), to_native(value)))
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else:
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for term in terms:
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with env.begin() as txn:
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if term.endswith('*'):
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cursor = txn.cursor()
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prefix = term[:-1] # strip asterisk
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cursor.set_range(to_text(term).encode())
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while cursor.key().startswith(to_text(prefix).encode()):
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for key, value in cursor:
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ret.append((to_text(key), to_native(value)))
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cursor.next()
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else:
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value = txn.get(to_text(term).encode())
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if value is not None:
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ret.append(to_native(value))
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return ret
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