Bump SQLAlchemy to 2.0 (#626)

* `SQLALCHEMY_WARN_20=1` fixed all removed warnings.

* fix some mypy errors

* fix fetchone

* make format

* ignore annotations

* let's try like this?

* remove

* make format

* Update pyproject.toml

Co-authored-by: Pavol Rusnak <[email protected]>

* extract _mapping in fetchone() and fetchall() + fix poetry lock

* fix

* make format

* fix integer indexing of row fields

* Update cashu/mint/crud.py

---------

Co-authored-by: Pavol Rusnak <[email protected]>
Co-authored-by: callebtc <[email protected]>

cashu/core/base.py

@@ -647,7 +647,6 @@ def deserialize(serialized: str) -> Dict[int, PublicKey]:
                 int(amount): PublicKey(bytes.fromhex(hex_key), raw=True)
                 for amount, hex_key in dict(json.loads(serialized)).items()
             }
-
         return cls(
             id=row["id"],
             unit=row["unit"],

cashu/core/db.py

@@ -10,7 +10,8 @@
 from sqlalchemy import text
 from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
 from sqlalchemy.orm import sessionmaker
-from sqlalchemy.pool import NullPool, QueuePool
+from sqlalchemy.pool import AsyncAdaptedQueuePool, NullPool
+from sqlalchemy.sql.expression import TextClause
 
 from cashu.core.settings import settings
 
@@ -64,7 +65,7 @@ def big_int(self) -> str:
     def table_with_schema(self, table: str):
         return f"{self.references_schema if self.schema else ''}{table}"
 
-
+# https://docs.sqlalchemy.org/en/14/core/connections.html#sqlalchemy.engine.CursorResult
 class Connection(Compat):
     def __init__(self, conn: AsyncSession, txn, typ, name, schema):
         self.conn = conn
@@ -73,19 +74,20 @@ def __init__(self, conn: AsyncSession, txn, typ, name, schema):
         self.name = name
         self.schema = schema
 
-    def rewrite_query(self, query) -> str:
+    def rewrite_query(self, query) -> TextClause:
         if self.type in {POSTGRES, COCKROACH}:
             query = query.replace("%", "%%")
             query = query.replace("?", "%s")
         return text(query)
 
-    async def fetchall(self, query: str, values: dict = {}) -> list:
+    async def fetchall(self, query: str, values: dict = {}):
         result = await self.conn.execute(self.rewrite_query(query), values)
-        return result.all()
+        return [r._mapping for r in result.all()] # will return [] if result list is empty
 
     async def fetchone(self, query: str, values: dict = {}):
         result = await self.conn.execute(self.rewrite_query(query), values)
-        return result.fetchone()
+        r = result.fetchone()
+        return r._mapping if r is not None else None
 
     async def execute(self, query: str, values: dict = {}):
         return await self.conn.execute(self.rewrite_query(query), values)
@@ -132,9 +134,9 @@ def __init__(self, db_name: str, db_location: str):
         if not settings.db_connection_pool:
             kwargs["poolclass"] = NullPool
         elif self.type == POSTGRES:
-            kwargs["poolclass"] = QueuePool
-            kwargs["pool_size"] = 50
-            kwargs["max_overflow"] = 100
+            kwargs["poolclass"] = AsyncAdaptedQueuePool # type: ignore[assignment]
+            kwargs["pool_size"] = 50                    # type: ignore[assignment]
+            kwargs["max_overflow"] = 100                # type: ignore[assignment]
 
         self.engine = create_async_engine(database_uri, **kwargs)
         self.async_session = sessionmaker(
@@ -281,12 +283,13 @@ async def acquire_lock(
     async def fetchall(self, query: str, values: dict = {}) -> list:
         async with self.connect() as conn:
             result = await conn.execute(query, values)
-            return result.all()
+            return [r._mapping for r in result.all()]
 
     async def fetchone(self, query: str, values: dict = {}):
         async with self.connect() as conn:
             result = await conn.execute(query, values)
-            return result.fetchone()
+            r = result.fetchone()
+            return r._mapping if r is not None else None
 
     async def execute(self, query: str, values: dict = {}):
         async with self.connect() as conn:

cashu/core/migrations.py

@@ -104,6 +104,6 @@ async def run_migration(db, migrations_module):
             f"SELECT * FROM {db.table_with_schema('dbversions')}"
         )
         rows = result.all()
-        current_versions = {row["db"]: row["version"] for row in rows}
+        current_versions = {row._mapping["db"]: row._mapping["version"] for row in rows}
         matcher = re.compile(r"^m(\d\d\d)_")
     await run_migration(db, migrations_module)

cashu/mint/crud.py

@@ -691,7 +691,10 @@ async def get_balance(
             """
         )
         assert row, "Balance not found"
-        return int(row[0])
+
+        # sqlalchemy index of first element
+        key = next(iter(row))
+        return int(row[key])
 
     async def get_keyset(
         self,

cashu/wallet/crud.py

@@ -377,7 +377,7 @@ async def bump_secret_derivation(
         )
         counter = 0
     else:
-        counter = int(rows[0])
+        counter = int(rows["counter"])
 
     if not skip:
         await (conn or db).execute(
@@ -437,8 +437,8 @@ async def get_seed_and_mnemonic(
     )
     return (
         (
-            row[0],
-            row[1],
+            row["seed"],
+            row["mnemonic"],
         )
         if row
         else None