290 líneas
7,2 KiB
Python
290 líneas
7,2 KiB
Python
import os
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import sys
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import random
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import psycopg2
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from psycopg2 import sql
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from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
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from getpass import getpass
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import pdb
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class Database():
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name = 'database library'
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def __init__(self, config_file=None, db=None, db_user=None, db_user_password=None, table=None, service=None):
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self.config_file = "config/db_config.txt"
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self.db = self.__get_parameter("db", self.config_file)
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self.db_user = self.__get_parameter("db_user", self.config_file)
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self.db_user_password = self.__get_parameter("db_user_password", self.config_file)
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self.db_table = self.__get_parameter("db_table", self.config_file)
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self.service = self.__get_parameter("service", self.config_file)
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db_setup = self.__check_dbsetup(self)
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if not db_setup:
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self.db = input("\ndatabase name: ")
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self.db_user = input("\ndatabase user: ")
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self.db_user_password = getpass("\ndatabase user password: ")
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self.db_table = input("\ndatabase's table name: ")
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self.service = input("\nservice: ")
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self.__createdb(self)
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self.__create_config(self)
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self.__write_config(self)
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def user_save(self, id, username, date, service):
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insert_sql = "INSERT INTO users(id, username, created_at, service) VALUES(%s,%s,%s,%s) ON CONFLICT DO NOTHING"
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conn = None
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try:
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conn = psycopg2.connect(database=self.db, user=self.db_user, password="", host="/var/run/postgresql", port="5432")
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cur = conn.cursor()
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cur.execute(insert_sql, (id, username, date, service))
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conn.commit()
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cur.close()
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except (Exception, psycopg2.DatabaseError) as error:
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print(error)
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finally:
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if conn is not None:
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conn.close()
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def load_users(self):
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users = []
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select_sql = "select id, username, created_at, service from users order by created_at, id asc"
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conn = None
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try:
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conn = psycopg2.connect(database=self.db, user=self.db_user, password="", host="/var/run/postgresql", port="5432")
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cur = conn.cursor()
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cur.execute(select_sql)
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rows = cur.fetchall()
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for row in rows:
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new_user = {"id": row[0], "username": row[1], "created_at": row[2], "service": row[3]}
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users.append(new_user)
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return users
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cur.close()
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except (Exception, psycopg2.DatabaseError) as error:
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print(error)
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finally:
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if conn is not None:
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conn.close()
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def delete_user(self, id, username):
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delete_sql = "delete from users where id=(%s) and username=(%s)"
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conn = None
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try:
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conn = psycopg2.connect(database=self.db, user=self.db_user, password="", host="/var/run/postgresql", port="5432")
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cur = conn.cursor()
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cur.execute(delete_sql, (id, username))
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conn.commit()
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cur.close()
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except (Exception, psycopg2.DatabaseError) as error:
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print(error)
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finally:
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if conn is not None:
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conn.close()
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@staticmethod
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def __check_dbsetup(self):
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db_setup = False
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try:
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conn = None
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conn = psycopg2.connect(database = self.db, user = self.db_user, password = self.db_user_password, host = "/var/run/postgresql", port = "5432")
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cur = conn.cursor()
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cur.execute("select * from information_schema.tables where table_name=(%s)", (self.db_table,))
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db_setup = bool(cur.rowcount)
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except (Exception, psycopg2.DatabaseError) as error:
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print(error)
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return db_setup
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@staticmethod
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def __createdb(self):
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conn = None
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try:
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conn = psycopg2.connect(dbname='postgres',
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user=self.db_user, host='',
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password=self.db_user_password)
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conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
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cur = conn.cursor()
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print(f"Creating database {self.db}. Please wait...")
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cur.execute(sql.SQL("CREATE DATABASE {}").format(
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sql.Identifier(self.db))
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)
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print(f"Database {self.db} created!\n")
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self.__dbtables_schemes(self)
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except (Exception, psycopg2.DatabaseError) as error:
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print(error)
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finally:
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if conn is not None:
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conn.close()
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@staticmethod
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def __dbtables_schemes(self):
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table = self.db_table
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sql = f"create table {table} (id bigint, username varchar, created_at date, service varchar)"
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self.__create_table(self, table, sql)
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index = "users_pkey"
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sql_index = f'CREATE UNIQUE INDEX {index} ON {table} (id, username)'
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self.__create_index(self, table, index, sql_index)
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@staticmethod
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def __create_table(self, table, sql):
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conn = None
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try:
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conn = psycopg2.connect(database = self.db, user = self.db_user, password = self.db_user_password, host = "/var/run/postgresql", port = "5432")
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cur = conn.cursor()
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print(f"Creating table {table}")
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cur.execute(sql)
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conn.commit()
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print(f"Table {table} created!\n")
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except (Exception, psycopg2.DatabaseError) as error:
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print(error)
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finally:
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if conn is not None:
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conn.close()
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@staticmethod
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def __create_index(self, table, index, sql_index):
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conn = None
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try:
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conn = psycopg2.connect(database = self.db, user = self.db_user, password = "", host = "/var/run/postgresql", port = "5432")
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cur = conn.cursor()
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print(f"Creating index...{index}")
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# Create the table in PostgreSQL database
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cur.execute(sql_index)
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conn.commit()
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print(f"Index {index} created!\n")
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except (Exception, psycopg2.DatabaseError) as error:
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print(error)
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finally:
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if conn is not None:
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conn.close()
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def __get_parameter(self, parameter, config_file):
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if not os.path.isfile(config_file):
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print(f"File {config_file} not found..")
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return
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with open( config_file ) as f:
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for line in f:
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if line.startswith( parameter ):
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return line.replace(parameter + ":", "").strip()
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print(f"{config_file} Missing parameter {parameter}")
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sys.exit(0)
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@staticmethod
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def __create_config(self):
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if not os.path.exists('config'):
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os.makedirs('config')
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if not os.path.exists(self.config_file):
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print(self.config_file + " created!")
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with open(self.config_file, 'w'): pass
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@staticmethod
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def __write_config(self):
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with open(self.config_file, 'a') as the_file:
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the_file.write(f'db: {self.db}\ndb_user: {self.db_user}\ndb_user_password: {self.db_user_password}\nservice: {self.service}')
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print(f"adding parameters to {self.config_file}\n")
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