langchain-ai--langgraph/libs/langgraph/tests/conftest_store.py

from contextlib import asynccontextmanager, contextmanager
from uuid import uuid4

from langgraph.store.memory import InMemoryStore
from langgraph.store.postgres import AsyncPostgresStore, PostgresStore
from psycopg import AsyncConnection, Connection

DEFAULT_POSTGRES_URI = "postgres://postgres:postgres@localhost:5442/"


@contextmanager
def _store_memory():
    store = InMemoryStore()
    yield store


@contextmanager
def _store_postgres():
    database = f"test_{uuid4().hex[:16]}"
    # create unique db
    with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
        conn.execute(f"CREATE DATABASE {database}")
    try:
        # yield store
        with PostgresStore.from_conn_string(DEFAULT_POSTGRES_URI + database) as store:
            store.setup()
            yield store
    finally:
        # drop unique db
        with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
            conn.execute(f"DROP DATABASE {database}")


@contextmanager
def _store_postgres_pipe():
    database = f"test_{uuid4().hex[:16]}"
    # create unique db
    with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
        conn.execute(f"CREATE DATABASE {database}")
    try:
        # yield store
        with PostgresStore.from_conn_string(DEFAULT_POSTGRES_URI + database) as store:
            store.setup()  # Run in its own transaction
        with PostgresStore.from_conn_string(
            DEFAULT_POSTGRES_URI + database, pipeline=True
        ) as store:
            yield store
    finally:
        # drop unique db
        with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
            conn.execute(f"DROP DATABASE {database}")


@contextmanager
def _store_postgres_pool():
    database = f"test_{uuid4().hex[:16]}"
    # create unique db
    with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
        conn.execute(f"CREATE DATABASE {database}")
    try:
        # yield store
        with PostgresStore.from_conn_string(
            DEFAULT_POSTGRES_URI + database, pool_config={"max_size": 10}
        ) as store:
            store.setup()
            yield store
    finally:
        # drop unique db
        with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
            conn.execute(f"DROP DATABASE {database}")


@asynccontextmanager
async def _store_postgres_aio():
    database = f"test_{uuid4().hex[:16]}"
    async with await AsyncConnection.connect(
        DEFAULT_POSTGRES_URI, autocommit=True
    ) as conn:
        await conn.execute(f"CREATE DATABASE {database}")
    try:
        async with AsyncPostgresStore.from_conn_string(
            DEFAULT_POSTGRES_URI + database
        ) as store:
            await store.setup()
            yield store
    finally:
        async with await AsyncConnection.connect(
            DEFAULT_POSTGRES_URI, autocommit=True
        ) as conn:
            await conn.execute(f"DROP DATABASE {database}")


@asynccontextmanager
async def _store_postgres_aio_pipe():
    database = f"test_{uuid4().hex[:16]}"
    async with await AsyncConnection.connect(
        DEFAULT_POSTGRES_URI, autocommit=True
    ) as conn:
        await conn.execute(f"CREATE DATABASE {database}")
    try:
        async with AsyncPostgresStore.from_conn_string(
            DEFAULT_POSTGRES_URI + database
        ) as store:
            await store.setup()  # Run in its own transaction
        async with AsyncPostgresStore.from_conn_string(
            DEFAULT_POSTGRES_URI + database, pipeline=True
        ) as store:
            yield store
    finally:
        async with await AsyncConnection.connect(
            DEFAULT_POSTGRES_URI, autocommit=True
        ) as conn:
            await conn.execute(f"DROP DATABASE {database}")


@asynccontextmanager
async def _store_postgres_aio_pool():
    database = f"test_{uuid4().hex[:16]}"
    async with await AsyncConnection.connect(
        DEFAULT_POSTGRES_URI, autocommit=True
    ) as conn:
        await conn.execute(f"CREATE DATABASE {database}")
    try:
        async with AsyncPostgresStore.from_conn_string(
            DEFAULT_POSTGRES_URI + database,
            pool_config={"max_size": 10},
        ) as store:
            await store.setup()
            yield store
    finally:
        async with await AsyncConnection.connect(
            DEFAULT_POSTGRES_URI, autocommit=True
        ) as conn:
            await conn.execute(f"DROP DATABASE {database}")


__all__ = [
    "_store_memory",
    "_store_postgres",
    "_store_postgres_pipe",
    "_store_postgres_pool",
    "_store_postgres_aio",
    "_store_postgres_aio_pipe",
    "_store_postgres_aio_pool",
]