forked from phoenix-oss/llama-stack-mirror
dcd8cfe0f3
* add postgres kvstoreimpl * make table name configurable * add validator for table name * linter fix --------- Co-authored-by: Dinesh Yeduguru <dineshyv@fb.com>
103 lines
3.2 KiB
Python
103 lines
3.2 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the terms described in the LICENSE file in
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# the root directory of this source tree.
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from datetime import datetime
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from typing import List, Optional
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import psycopg2
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from psycopg2.extras import DictCursor
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from ..api import KVStore
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from ..config import PostgresKVStoreConfig
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class PostgresKVStoreImpl(KVStore):
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def __init__(self, config: PostgresKVStoreConfig):
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self.config = config
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self.conn = None
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self.cursor = None
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async def initialize(self) -> None:
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try:
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self.conn = psycopg2.connect(
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host=self.config.host,
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port=self.config.port,
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database=self.config.db,
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user=self.config.user,
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password=self.config.password,
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)
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self.conn.autocommit = True
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self.cursor = self.conn.cursor(cursor_factory=DictCursor)
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# Create table if it doesn't exist
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self.cursor.execute(
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f"""
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CREATE TABLE IF NOT EXISTS {self.config.table_name} (
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key TEXT PRIMARY KEY,
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value TEXT,
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expiration TIMESTAMP
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)
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"""
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)
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except Exception as e:
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import traceback
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traceback.print_exc()
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raise RuntimeError("Could not connect to PostgreSQL database server") from e
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def _namespaced_key(self, key: str) -> str:
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if not self.config.namespace:
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return key
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return f"{self.config.namespace}:{key}"
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async def set(
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self, key: str, value: str, expiration: Optional[datetime] = None
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) -> None:
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key = self._namespaced_key(key)
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self.cursor.execute(
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f"""
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INSERT INTO {self.config.table_name} (key, value, expiration)
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VALUES (%s, %s, %s)
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ON CONFLICT (key) DO UPDATE
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SET value = EXCLUDED.value, expiration = EXCLUDED.expiration
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""",
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(key, value, expiration),
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)
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async def get(self, key: str) -> Optional[str]:
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key = self._namespaced_key(key)
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self.cursor.execute(
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f"""
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SELECT value FROM {self.config.table_name}
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WHERE key = %s
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AND (expiration IS NULL OR expiration > NOW())
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""",
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(key,),
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)
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result = self.cursor.fetchone()
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return result[0] if result else None
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async def delete(self, key: str) -> None:
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key = self._namespaced_key(key)
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self.cursor.execute(
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f"DELETE FROM {self.config.table_name} WHERE key = %s",
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(key,),
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)
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async def range(self, start_key: str, end_key: str) -> List[str]:
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start_key = self._namespaced_key(start_key)
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end_key = self._namespaced_key(end_key)
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self.cursor.execute(
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f"""
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SELECT value FROM {self.config.table_name}
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WHERE key >= %s AND key < %s
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AND (expiration IS NULL OR expiration > NOW())
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ORDER BY key
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""",
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(start_key, end_key),
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)
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return [row[0] for row in self.cursor.fetchall()]
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