62 lines
1.7 KiB
Python
62 lines
1.7 KiB
Python
import psycopg2
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import psycopg2.extras
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from chalicelib.utils.helper import environ
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PG_CONFIG = {"host": environ["pg_host"],
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"database": environ["pg_dbname"],
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"user": environ["pg_user"],
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"password": environ["pg_password"],
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"port": int(environ["pg_port"])}
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from psycopg2 import pool
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from threading import Semaphore
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class ORThreadedConnectionPool(psycopg2.pool.ThreadedConnectionPool):
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def __init__(self, minconn, maxconn, *args, **kwargs):
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self._semaphore = Semaphore(maxconn)
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super().__init__(minconn, maxconn, *args, **kwargs)
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def getconn(self, *args, **kwargs):
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self._semaphore.acquire()
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return super().getconn(*args, **kwargs)
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def putconn(self, *args, **kwargs):
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super().putconn(*args, **kwargs)
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self._semaphore.release()
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try:
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postgreSQL_pool = ORThreadedConnectionPool(50, 100, **PG_CONFIG)
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if (postgreSQL_pool):
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print("Connection pool created successfully")
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except (Exception, psycopg2.DatabaseError) as error:
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print("Error while connecting to PostgreSQL", error)
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raise error
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class PostgresClient:
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connection = None
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cursor = None
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def __init__(self):
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self.connection = postgreSQL_pool.getconn()
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def __enter__(self):
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if self.cursor is None:
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self.cursor = self.connection.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
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return self.cursor
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def __exit__(self, *args):
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try:
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self.connection.commit()
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self.cursor.close()
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except Exception as error:
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print("Error while committing/closing PG-connection", error)
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raise error
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finally:
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postgreSQL_pool.putconn(self.connection)
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def close():
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pass
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