feat: implement connection pooling and automatic schema migration for performance
This commit is contained in:
Cipher Vance
parent
45a1b2f234
commit
66011bcd0f
1 changed files with 201 additions and 45 deletions
248
database.py
248
database.py
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@ -1,66 +1,222 @@
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import os
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import psycopg2
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from psycopg2 import IntegrityError
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from psycopg2 import pool, IntegrityError
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from dotenv import load_dotenv
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import logging
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load_dotenv()
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# Global connection pool
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_connection_pool = None
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def get_connection_pool():
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"""Initialize and return the connection pool"""
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global _connection_pool
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if _connection_pool is None:
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try:
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_connection_pool = psycopg2.pool.ThreadedConnectionPool(
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minconn=2,
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maxconn=20,
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host=os.getenv("PG_HOST"),
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port=os.getenv("PG_PORT", 5432),
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dbname=os.getenv("PG_DATABASE"),
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user=os.getenv("PG_USER"),
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password=os.getenv("PG_PASSWORD"),
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connect_timeout=5
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)
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logging.info("Database connection pool created successfully")
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except Exception as e:
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logging.error(f"Error creating connection pool: {e}")
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raise
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return _connection_pool
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def get_connection():
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"""Return a database connection."""
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return psycopg2.connect(
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host=os.getenv("PG_HOST"),
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port=os.getenv("PG_PORT"),
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dbname=os.getenv("PG_DATABASE"),
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user=os.getenv("PG_USER"),
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password=os.getenv("PG_PASSWORD"),
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connect_timeout=10
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)
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"""Get a connection from the pool"""
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try:
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pool = get_connection_pool()
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conn = pool.getconn()
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if conn.closed:
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# Connection is closed, remove it and get a new one
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pool.putconn(conn, close=True)
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conn = pool.getconn()
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return conn
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except Exception as e:
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logging.error(f"Error getting connection from pool: {e}")
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raise
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def return_connection(conn):
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"""Return a connection to the pool"""
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try:
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pool = get_connection_pool()
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pool.putconn(conn)
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except Exception as e:
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logging.error(f"Error returning connection to pool: {e}")
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def close_all_connections():
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"""Close all connections in the pool"""
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global _connection_pool
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if _connection_pool:
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_connection_pool.closeall()
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_connection_pool = None
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logging.info("All database connections closed")
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def column_exists(cursor, table_name, column_name):
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"""Check if a column exists in a table"""
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cursor.execute("""
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SELECT EXISTS (
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SELECT 1
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FROM information_schema.columns
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WHERE table_name = %s AND column_name = %s
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)
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""", (table_name, column_name))
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return cursor.fetchone()[0]
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def index_exists(cursor, index_name):
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"""Check if an index exists"""
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cursor.execute("""
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SELECT EXISTS (
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SELECT 1 FROM pg_class c
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JOIN pg_namespace n ON n.oid = c.relnamespace
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WHERE c.relname = %s AND n.nspname = 'public'
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)
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""", (index_name,))
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return cursor.fetchone()[0]
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def init_db():
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conn = get_connection()
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cursor = conn.cursor()
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cursor.execute("""
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CREATE TABLE IF NOT EXISTS subscribers (
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id SERIAL PRIMARY KEY,
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email TEXT UNIQUE NOT NULL
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)
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""")
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"""Initialize database tables and indexes"""
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conn = None
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try:
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conn = get_connection()
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cursor = conn.cursor()
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cursor.execute("""
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CREATE TABLE IF NOT EXISTS newsletters(
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id SERIAL PRIMARY KEY,
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subject TEXT NOT NULL,
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body TEXT NOT NULL,
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sent_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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)
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""")
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# Create subscribers table
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cursor.execute("""
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CREATE TABLE IF NOT EXISTS subscribers (
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id SERIAL PRIMARY KEY,
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email TEXT UNIQUE NOT NULL
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)
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""")
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conn.commit()
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cursor.close()
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conn.close()
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# Add created_at column if it doesn't exist
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if not column_exists(cursor, 'subscribers', 'created_at'):
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cursor.execute("""
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ALTER TABLE subscribers
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ADD COLUMN created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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""")
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logging.info("Added created_at column to subscribers table")
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# Create newsletters table
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cursor.execute("""
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CREATE TABLE IF NOT EXISTS newsletters(
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id SERIAL PRIMARY KEY,
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subject TEXT NOT NULL,
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body TEXT NOT NULL,
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sent_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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)
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""")
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# Create indexes only if they don't exist
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if not index_exists(cursor, 'idx_newsletters_sent_at'):
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cursor.execute("CREATE INDEX idx_newsletters_sent_at ON newsletters(sent_at DESC)")
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logging.info("Created index idx_newsletters_sent_at")
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if not index_exists(cursor, 'idx_subscribers_email'):
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cursor.execute("CREATE INDEX idx_subscribers_email ON subscribers(email)")
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logging.info("Created index idx_subscribers_email")
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if not index_exists(cursor, 'idx_subscribers_created_at'):
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cursor.execute("CREATE INDEX idx_subscribers_created_at ON subscribers(created_at DESC)")
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logging.info("Created index idx_subscribers_created_at")
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conn.commit()
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cursor.close()
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logging.info("Database tables and indexes initialized successfully")
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except Exception as e:
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logging.error(f"Error initializing database: {e}")
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if conn:
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conn.rollback()
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raise
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finally:
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if conn:
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return_connection(conn)
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def add_email(email):
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"""Add email to subscribers with connection pooling"""
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conn = None
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try:
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with get_connection() as conn:
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with conn.cursor() as cursor:
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cursor.execute("INSERT INTO subscribers (email) VALUES (%s)", (email,))
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conn.commit()
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conn = get_connection()
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cursor = conn.cursor()
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cursor.execute("INSERT INTO subscribers (email) VALUES (%s)", (email,))
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conn.commit()
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cursor.close()
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logging.info(f"Email added successfully: {email}")
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return True
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except IntegrityError:
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return False
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except psycopg2.OperationalError as e:
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print(f"Error: {e}")
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# Email already exists
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if conn:
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conn.rollback()
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logging.info(f"Email already exists: {email}")
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return False
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def remove_email(email):
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try:
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with get_connection() as conn:
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with conn.cursor() as cursor:
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cursor.execute("DELETE FROM subscribers WHERE email = %s", (email,))
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conn.commit()
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if cursor.rowcount > 0:
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return True
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return False
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except Exception as e:
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print(f"Error removing email: {e}")
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if conn:
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conn.rollback()
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logging.error(f"Error adding email {email}: {e}")
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return False
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finally:
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if conn:
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return_connection(conn)
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def remove_email(email):
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"""Remove email from subscribers with connection pooling"""
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conn = None
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try:
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conn = get_connection()
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cursor = conn.cursor()
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cursor.execute("DELETE FROM subscribers WHERE email = %s", (email,))
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conn.commit()
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rows_affected = cursor.rowcount
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cursor.close()
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if rows_affected > 0:
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logging.info(f"Email removed successfully: {email}")
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return True
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else:
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logging.info(f"Email not found for removal: {email}")
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return False
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except Exception as e:
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if conn:
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conn.rollback()
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logging.error(f"Error removing email {email}: {e}")
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return False
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finally:
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if conn:
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return_connection(conn)
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def get_subscriber_count():
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"""Get total number of subscribers"""
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conn = None
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try:
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conn = get_connection()
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cursor = conn.cursor()
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cursor.execute("SELECT COUNT(*) FROM subscribers")
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count = cursor.fetchone()[0]
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cursor.close()
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return count
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except Exception as e:
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logging.error(f"Error getting subscriber count: {e}")
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return 0
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finally:
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if conn:
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return_connection(conn)
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# Cleanup function for graceful shutdown
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import atexit
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atexit.register(close_all_connections)
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