#!/usr/bin/python # -*- coding: utf-8 -*- # Copyright: (c) 2020, Andrew Klychkov (@Andersson007) # 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', 'status': ['preview'], 'supported_by': 'community' } DOCUMENTATION = r''' --- module: postgresql_user_obj_stat_info short_description: Gather statistics about PostgreSQL user objects description: - Gathers statistics about PostgreSQL user objects. version_added: '2.10' options: filter: description: - Limit the collected information by comma separated string or YAML list. - Allowable values are C(functions), C(indexes), C(tables). - By default, collects all subsets. - Unsupported values are ignored. type: list elements: str schema: description: - Restrict the output by certain schema. type: str db: description: - Name of database to connect. 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: - C(size) and C(total_size) returned values are presented in bytes. - For tracking function statistics the PostgreSQL C(track_functions) parameter must be enabled. See U(https://www.postgresql.org/docs/current/runtime-config-statistics.html) for more information. seealso: - module: postgresql_info - module: postgresql_ping - name: PostgreSQL statistics collector reference description: Complete reference of the PostgreSQL statistics collector documentation. link: https://www.postgresql.org/docs/current/monitoring-stats.html author: - Andrew Klychkov (@Andersson007) extends_documentation_fragment: postgres ''' EXAMPLES = r''' - name: Collect information about all supported user objects of the acme database postgresql_user_obj_stat_info: db: acme - name: Collect information about all supported user objects in the custom schema of the acme database postgresql_user_obj_stat_info: db: acme schema: custom - name: Collect information about user tables and indexes in the acme database postgresql_user_obj_stat_info: db: acme filter: tables, indexes ''' RETURN = r''' indexes: description: User index statistics returned: always type: dict sample: {"public": {"test_id_idx": {"idx_scan": 0, "idx_tup_fetch": 0, "idx_tup_read": 0, "relname": "test", "size": 8192, ...}}} tables: description: User table statistics. returned: always type: dict sample: {"public": {"test": {"analyze_count": 3, "n_dead_tup": 0, "n_live_tup": 0, "seq_scan": 2, "size": 0, "total_size": 8192, ...}}} functions: description: User function statistics. returned: always type: dict sample: {"public": {"inc": {"calls": 1, "funcid": 26722, "self_time": 0.23, "total_time": 0.23}}} ''' 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.module_utils.postgres import ( connect_to_db, exec_sql, get_conn_params, postgres_common_argument_spec, ) from ansible.module_utils.six import iteritems # =========================================== # PostgreSQL module specific support methods. # class PgUserObjStatInfo(): """Class to collect information about PostgreSQL user objects. Args: module (AnsibleModule): Object of AnsibleModule class. cursor (cursor): Cursor object of psycopg2 library to work with PostgreSQL. Attributes: module (AnsibleModule): Object of AnsibleModule class. cursor (cursor): Cursor object of psycopg2 library to work with PostgreSQL. executed_queries (list): List of executed queries. info (dict): Statistics dictionary. obj_func_mapping (dict): Mapping of object types to corresponding functions. schema (str): Name of a schema to restrict stat collecting. """ def __init__(self, module, cursor): self.module = module self.cursor = cursor self.info = { 'functions': {}, 'indexes': {}, 'tables': {}, } self.obj_func_mapping = { 'functions': self.get_func_stat, 'indexes': self.get_idx_stat, 'tables': self.get_tbl_stat, } self.schema = None def collect(self, filter_=None, schema=None): """Collect statistics information of user objects. Kwargs: filter_ (list): List of subsets which need to be collected. schema (str): Restrict stat collecting by certain schema. Returns: ``self.info``. """ if schema: self.set_schema(schema) if filter_: for obj_type in filter_: obj_type = obj_type.strip() obj_func = self.obj_func_mapping.get(obj_type) if obj_func is not None: obj_func() else: self.module.warn("Unknown filter option '%s'" % obj_type) else: for obj_func in self.obj_func_mapping.values(): obj_func() return self.info def get_func_stat(self): """Get function statistics and fill out self.info dictionary.""" if not self.schema: query = "SELECT * FROM pg_stat_user_functions" result = exec_sql(self, query, add_to_executed=False) else: query = "SELECT * FROM pg_stat_user_functions WHERE schemaname = %s" result = exec_sql(self, query, query_params=(self.schema,), add_to_executed=False) if not result: return self.__fill_out_info(result, info_key='functions', schema_key='schemaname', name_key='funcname') def get_idx_stat(self): """Get index statistics and fill out self.info dictionary.""" if not self.schema: query = "SELECT * FROM pg_stat_user_indexes" result = exec_sql(self, query, add_to_executed=False) else: query = "SELECT * FROM pg_stat_user_indexes WHERE schemaname = %s" result = exec_sql(self, query, query_params=(self.schema,), add_to_executed=False) if not result: return self.__fill_out_info(result, info_key='indexes', schema_key='schemaname', name_key='indexrelname') def get_tbl_stat(self): """Get table statistics and fill out self.info dictionary.""" if not self.schema: query = "SELECT * FROM pg_stat_user_tables" result = exec_sql(self, query, add_to_executed=False) else: query = "SELECT * FROM pg_stat_user_tables WHERE schemaname = %s" result = exec_sql(self, query, query_params=(self.schema,), add_to_executed=False) if not result: return self.__fill_out_info(result, info_key='tables', schema_key='schemaname', name_key='relname') def __fill_out_info(self, result, info_key=None, schema_key=None, name_key=None): # Convert result to list of dicts to handle it easier: result = [dict(row) for row in result] for elem in result: # Add schema name as a key if not presented: if not self.info[info_key].get(elem[schema_key]): self.info[info_key][elem[schema_key]] = {} # Add object name key as a subkey # (they must be uniq over a schema, so no need additional checks): self.info[info_key][elem[schema_key]][elem[name_key]] = {} # Add other other attributes to a certain index: for key, val in iteritems(elem): if key not in (schema_key, name_key): self.info[info_key][elem[schema_key]][elem[name_key]][key] = val if info_key in ('tables', 'indexes'): relname = elem[name_key] schemaname = elem[schema_key] if not self.schema: result = exec_sql(self, "SELECT pg_relation_size ('%s.%s')" % (schemaname, relname), add_to_executed=False) else: relname = '%s.%s' % (self.schema, relname) result = exec_sql(self, "SELECT pg_relation_size (%s)", query_params=(relname,), add_to_executed=False) self.info[info_key][elem[schema_key]][elem[name_key]]['size'] = result[0][0] if info_key == 'tables': relname = elem[name_key] schemaname = elem[schema_key] if not self.schema: result = exec_sql(self, "SELECT pg_total_relation_size ('%s.%s')" % (schemaname, relname), add_to_executed=False) else: relname = '%s.%s' % (self.schema, relname) result = exec_sql(self, "SELECT pg_total_relation_size (%s)", query_params=(relname,), add_to_executed=False) self.info[info_key][elem[schema_key]][elem[name_key]]['total_size'] = result[0][0] def set_schema(self, schema): """If schema exists, sets self.schema, otherwise fails.""" query = ("SELECT 1 FROM information_schema.schemata " "WHERE schema_name = %s") result = exec_sql(self, query, query_params=(schema,), add_to_executed=False) if result and result[0][0]: self.schema = schema else: self.module.fail_json(msg="Schema '%s' does not exist" % (schema)) # =========================================== # Module execution. # def main(): argument_spec = postgres_common_argument_spec() argument_spec.update( db=dict(type='str', aliases=['login_db']), filter=dict(type='list', elements='str'), session_role=dict(type='str'), schema=dict(type='str'), ) module = AnsibleModule( argument_spec=argument_spec, supports_check_mode=True, ) filter_ = module.params["filter"] schema = module.params["schema"] # Connect to DB and make cursor object: pg_conn_params = get_conn_params(module, module.params) # We don't need to commit anything, so, set it to False: db_connection = connect_to_db(module, pg_conn_params, autocommit=False) cursor = db_connection.cursor(cursor_factory=DictCursor) ############################ # Create object and do work: pg_obj_info = PgUserObjStatInfo(module, cursor) info_dict = pg_obj_info.collect(filter_, schema) # Clean up: cursor.close() db_connection.close() # Return information: module.exit_json(**info_dict) if __name__ == '__main__': main()