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community.general/plugins/modules/database/postgresql/postgresql_copy.py
Ansible Core Team aebc1b03fd Initial commit
2020-03-09 09:11:07 +00:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright: (c) 2019, Andrew Klychkov (@Andersson007) <aaklychkov@mail.ru>
# 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
ANSIBLE_METADATA = {
'metadata_version': '1.1',
'supported_by': 'community',
'status': ['preview']
}
DOCUMENTATION = r'''
---
module: postgresql_copy
short_description: Copy data between a file/program and a PostgreSQL table
description:
- Copy data between a file/program and a PostgreSQL table.
options:
copy_to:
description:
- Copy the contents of a table to a file.
- Can also copy the results of a SELECT query.
- Mutually exclusive with I(copy_from) and I(dst).
type: path
aliases: [ to ]
copy_from:
description:
- Copy data from a file to a table (appending the data to whatever is in the table already).
- Mutually exclusive with I(copy_to) and I(src).
type: path
aliases: [ from ]
src:
description:
- Copy data from I(copy_from) to I(src=tablename).
- Used with I(copy_to) only.
type: str
aliases: [ source ]
dst:
description:
- Copy data to I(dst=tablename) from I(copy_from=/path/to/data.file).
- Used with I(copy_from) only.
type: str
aliases: [ destination ]
columns:
description:
- List of column names for the src/dst table to COPY FROM/TO.
type: list
elements: str
aliases: [ column ]
program:
description:
- Mark I(src)/I(dst) as a program. Data will be copied to/from a program.
- See block Examples and PROGRAM arg description U(https://www.postgresql.org/docs/current/sql-copy.html).
type: bool
default: no
options:
description:
- Options of COPY command.
- See the full list of available options U(https://www.postgresql.org/docs/current/sql-copy.html).
type: dict
db:
description:
- Name of database to connect to.
type: str
aliases: [ login_db ]
session_role:
description:
- Switch to session_role after connecting.
The specified session_role must be a role that the current login_user is a member of.
- Permissions checking for SQL commands is carried out as though
the session_role were the one that had logged in originally.
type: str
notes:
- Supports PostgreSQL version 9.4+.
- COPY command is only allowed to database superusers.
- if I(check_mode=yes), we just check the src/dst table availability
and return the COPY query that actually has not been executed.
- If i(check_mode=yes) and the source has been passed as SQL, the module
will execute it and rolled the transaction back but pay attention
it can affect database performance (e.g., if SQL collects a lot of data).
seealso:
- name: COPY command reference
description: Complete reference of the COPY command documentation.
link: https://www.postgresql.org/docs/current/sql-copy.html
author:
- Andrew Klychkov (@Andersson007)
extends_documentation_fragment:
- community.general.postgres
'''
EXAMPLES = r'''
- name: Copy text TAB-separated data from file /tmp/data.txt to acme table
postgresql_copy:
copy_from: /tmp/data.txt
dst: acme
- name: Copy CSV (comma-separated) data from file /tmp/data.csv to columns id, name of table acme
postgresql_copy:
copy_from: /tmp/data.csv
dst: acme
columns: id,name
options:
format: csv
- name: >
Copy text vertical-bar-separated data from file /tmp/data.txt to bar table.
The NULL values are specified as N
postgresql_copy:
copy_from: /tmp/data.csv
dst: bar
options:
delimiter: '|'
null: 'N'
- name: Copy data from acme table to file /tmp/data.txt in text format, TAB-separated
postgresql_copy:
src: acme
copy_to: /tmp/data.txt
- name: Copy data from SELECT query to/tmp/data.csv in CSV format
postgresql_copy:
src: 'SELECT * FROM acme'
copy_to: /tmp/data.csv
options:
format: csv
- name: Copy CSV data from my_table to gzip
postgresql_copy:
src: my_table
copy_to: 'gzip > /tmp/data.csv.gz'
program: yes
options:
format: csv
- name: >
Copy data from columns id, name of table bar to /tmp/data.txt.
Output format is text, vertical-bar-separated, NULL as N
postgresql_copy:
src: bar
columns:
- id
- name
copy_to: /tmp/data.csv
options:
delimiter: '|'
null: 'N'
'''
RETURN = r'''
queries:
description: List of executed queries.
returned: always
type: str
sample: [ "COPY test_table FROM '/tmp/data_file.txt' (FORMAT csv, DELIMITER ',', NULL 'NULL')" ]
src:
description: Data source.
returned: always
type: str
sample: "mytable"
dst:
description: Data destination.
returned: always
type: str
sample: "/tmp/data.csv"
'''
try:
from psycopg2.extras import DictCursor
except ImportError:
# psycopg2 is checked by connect_to_db()
# from ansible.module_utils.postgres
pass
from ansible.module_utils.basic import AnsibleModule
from ansible_collections.community.general.plugins.module_utils.database import pg_quote_identifier
from ansible_collections.community.general.plugins.module_utils.postgres import (
connect_to_db,
exec_sql,
get_conn_params,
postgres_common_argument_spec,
)
from ansible.module_utils.six import iteritems
class PgCopyData(object):
"""Implements behavior of COPY FROM, COPY TO PostgreSQL command.
Arguments:
module (AnsibleModule) -- object of AnsibleModule class
cursor (cursor) -- cursor object of psycopg2 library
Attributes:
module (AnsibleModule) -- object of AnsibleModule class
cursor (cursor) -- cursor object of psycopg2 library
changed (bool) -- something was changed after execution or not
executed_queries (list) -- executed queries
dst (str) -- data destination table (when copy_from)
src (str) -- data source table (when copy_to)
opt_need_quotes (tuple) -- values of these options must be passed
to SQL in quotes
"""
def __init__(self, module, cursor):
self.module = module
self.cursor = cursor
self.executed_queries = []
self.changed = False
self.dst = ''
self.src = ''
self.opt_need_quotes = (
'DELIMITER',
'NULL',
'QUOTE',
'ESCAPE',
'ENCODING',
)
def copy_from(self):
"""Implements COPY FROM command behavior."""
self.src = self.module.params['copy_from']
self.dst = self.module.params['dst']
query_fragments = ['COPY %s' % pg_quote_identifier(self.dst, 'table')]
if self.module.params.get('columns'):
query_fragments.append('(%s)' % ','.join(self.module.params['columns']))
query_fragments.append('FROM')
if self.module.params.get('program'):
query_fragments.append('PROGRAM')
query_fragments.append("'%s'" % self.src)
if self.module.params.get('options'):
query_fragments.append(self.__transform_options())
# Note: check mode is implemented here:
if self.module.check_mode:
self.changed = self.__check_table(self.dst)
if self.changed:
self.executed_queries.append(' '.join(query_fragments))
else:
if exec_sql(self, ' '.join(query_fragments), ddl=True):
self.changed = True
def copy_to(self):
"""Implements COPY TO command behavior."""
self.src = self.module.params['src']
self.dst = self.module.params['copy_to']
if 'SELECT ' in self.src.upper():
# If src is SQL SELECT statement:
query_fragments = ['COPY (%s)' % self.src]
else:
# If src is a table:
query_fragments = ['COPY %s' % pg_quote_identifier(self.src, 'table')]
if self.module.params.get('columns'):
query_fragments.append('(%s)' % ','.join(self.module.params['columns']))
query_fragments.append('TO')
if self.module.params.get('program'):
query_fragments.append('PROGRAM')
query_fragments.append("'%s'" % self.dst)
if self.module.params.get('options'):
query_fragments.append(self.__transform_options())
# Note: check mode is implemented here:
if self.module.check_mode:
self.changed = self.__check_table(self.src)
if self.changed:
self.executed_queries.append(' '.join(query_fragments))
else:
if exec_sql(self, ' '.join(query_fragments), ddl=True):
self.changed = True
def __transform_options(self):
"""Transform options dict into a suitable string."""
for (key, val) in iteritems(self.module.params['options']):
if key.upper() in self.opt_need_quotes:
self.module.params['options'][key] = "'%s'" % val
opt = ['%s %s' % (key, val) for (key, val) in iteritems(self.module.params['options'])]
return '(%s)' % ', '.join(opt)
def __check_table(self, table):
"""Check table or SQL in transaction mode for check_mode.
Return True if it is OK.
Arguments:
table (str) - Table name that needs to be checked.
It can be SQL SELECT statement that was passed
instead of the table name.
"""
if 'SELECT ' in table.upper():
# In this case table is actually SQL SELECT statement.
# If SQL fails, it's handled by exec_sql():
exec_sql(self, table, add_to_executed=False)
# If exec_sql was passed, it means all is OK:
return True
exec_sql(self, 'SELECT 1 FROM %s' % pg_quote_identifier(table, 'table'),
add_to_executed=False)
# If SQL was executed successfully:
return True
# ===========================================
# Module execution.
#
def main():
argument_spec = postgres_common_argument_spec()
argument_spec.update(
copy_to=dict(type='path', aliases=['to']),
copy_from=dict(type='path', aliases=['from']),
src=dict(type='str', aliases=['source']),
dst=dict(type='str', aliases=['destination']),
columns=dict(type='list', elements='str', aliases=['column']),
options=dict(type='dict'),
program=dict(type='bool', default=False),
db=dict(type='str', aliases=['login_db']),
session_role=dict(type='str'),
)
module = AnsibleModule(
argument_spec=argument_spec,
supports_check_mode=True,
mutually_exclusive=[
['copy_from', 'copy_to'],
['copy_from', 'src'],
['copy_to', 'dst'],
]
)
# Note: we don't need to check mutually exclusive params here, because they are
# checked automatically by AnsibleModule (mutually_exclusive=[] list above).
if module.params.get('copy_from') and not module.params.get('dst'):
module.fail_json(msg='dst param is necessary with copy_from')
elif module.params.get('copy_to') and not module.params.get('src'):
module.fail_json(msg='src param is necessary with copy_to')
# Connect to DB and make cursor object:
conn_params = get_conn_params(module, module.params)
db_connection = connect_to_db(module, conn_params, autocommit=False)
cursor = db_connection.cursor(cursor_factory=DictCursor)
##############
# Create the object and do main job:
data = PgCopyData(module, cursor)
# Note: parameters like dst, src, etc. are got
# from module object into data object of PgCopyData class.
# Therefore not need to pass args to the methods below.
# Note: check mode is implemented inside the methods below
# by checking passed module.check_mode arg.
if module.params.get('copy_to'):
data.copy_to()
elif module.params.get('copy_from'):
data.copy_from()
# Finish:
if module.check_mode:
db_connection.rollback()
else:
db_connection.commit()
cursor.close()
db_connection.close()
# Return some values:
module.exit_json(
changed=data.changed,
queries=data.executed_queries,
src=data.src,
dst=data.dst,
)
if __name__ == '__main__':
main()
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