sqlite3.OperationalError: table _alembic_tmp_flow already exists during Langflow startup
NeoVand opened this issue · comments
Description:
When attempting to run Langflow (version v1.0.0a50), the application fails to start due to an error encountered during the database migration process. The specific error indicates that a temporary table (_alembic_tmp_flow) already exists in the SQLite database, causing a conflict and preventing the application from proceeding.
Steps to Reproduce:
Execute the command langflow run.
Observe the error during the startup process.
Expected Behavior:
Langflow should successfully run without encountering database migration errors.
Actual Behavior:
Langflow fails to start, logging the following error:
`~ % langflow run
Starting Langflow v1.0.0a50...
[06/11/24 11:59:19] ERROR 2024-06-11 11:59:19 - ERROR - main - main.py:59
(sqlite3.OperationalError) table
_alembic_tmp_flow already exists
[SQL:
CREATE TABLE _alembic_tmp_flow (
name VARCHAR NOT NULL,
description VARCHAR,
icon VARCHAR,
icon_bg_color VARCHAR,
is_component BOOLEAN,
updated_at DATETIME,
id CHAR(32) NOT NULL,
data JSON,
user_id CHAR(32),
folder_id CHAR(32),
endpoint_name VARCHAR,
PRIMARY KEY (id),
CONSTRAINT flow_folder_id_fkey
FOREIGN KEY(folder_id) REFERENCES folder
(id),
CONSTRAINT fk_flow_user_id_user
FOREIGN KEY(user_id) REFERENCES user
(id),
CONSTRAINT
unique_flow_endpoint_name UNIQUE
(user_id, endpoint_name),
CONSTRAINT unique_flow_name
UNIQUE (user_id, name),
UNIQUE (id)
)
]
(Background on this error at:
https://sqlalche.me/e/20/e3q8)
ERROR 2024-06-11 11:59:19 - ERROR - on - on.py:121
Traceback (most recent call last):
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/services/datab
ase/service.py", line 171, in
run_migrations
command.check(alembic_cfg)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/command.py",
line 290, in check
script_directory.run_env()
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/script/base.py"
, line 583, in run_env
util.load_python_file(self.dir,
"env.py")
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/util/pyfiles.py
", line 95, in load_python_file
module = load_module_py(module_id,
path)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/util/pyfiles.py
", line 113, in load_module_py
spec.loader.exec_module(module) #
type: ignore
File "<frozen
importlib._bootstrap_external>", line
883, in exec_module
File "<frozen importlib._bootstrap>",
line 241, in _call_with_frames_removed
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/alembic/env.py
", line 97, in <module>
run_migrations_online()
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/alembic/env.py
", line 91, in run_migrations_online
context.run_migrations()
File "<string>", line 8, in
run_migrations
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/runtime/environ
ment.py", line 948, in run_migrations
self.get_context().run_migrations(**k
w)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/runtime/migrati
on.py", line 615, in run_migrations
for step in
self._migrations_fn(heads, self):
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/command.py",
line 279, in retrieve_migrations
revision_context.run_autogenerate(rev
, context)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/autogenerate/ap
i.py", line 570, in run_autogenerate
self._run_environment(rev,
migration_context, True)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/autogenerate/ap
i.py", line 591, in _run_environment
raise util.CommandError("Target
database is not up to date.")
alembic.util.exc.CommandError: Target
database is not up to date.
During handling of the above exception,
another exception occurred:
Traceback (most recent call last):
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/base.
py", line 1967, in _exec_single_context
self.dialect.do_execute(
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/defau
lt.py", line 924, in do_execute
cursor.execute(statement, parameters)
sqlite3.OperationalError: table
_alembic_tmp_flow already exists
The above exception was the direct cause
of the following exception:
Traceback (most recent call last):
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/starlette/routing.py",
line 732, in lifespan
async with self.lifespan_context(app)
as maybe_state:
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/contextlib.py", line 199, in
__aenter__
return await anext(self.gen)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/main.py", line
50, in lifespan
initialize_services(fix_migration=fix
_migration,
socketio_server=socketio_server)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/services/utils
.py", line 166, in initialize_services
raise exc
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/services/utils
.py", line 164, in initialize_services
initialize_database(fix_migration=fix
_migration)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/services/datab
ase/utils.py", line 52, in
initialize_database
raise exc
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/services/datab
ase/utils.py", line 32, in
initialize_database
database_service.run_migrations(fix=f
ix_migration)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/services/datab
ase/service.py", line 174, in
run_migrations
command.upgrade(alembic_cfg, "head")
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/command.py",
line 403, in upgrade
script.run_env()
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/script/base.py"
, line 583, in run_env
util.load_python_file(self.dir,
"env.py")
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/util/pyfiles.py
", line 95, in load_python_file
module = load_module_py(module_id,
path)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/util/pyfiles.py
", line 113, in load_module_py
spec.loader.exec_module(module) #
type: ignore
File "<frozen
importlib._bootstrap_external>", line
883, in exec_module
File "<frozen importlib._bootstrap>",
line 241, in _call_with_frames_removed
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/alembic/env.py
", line 97, in <module>
run_migrations_online()
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/alembic/env.py
", line 91, in run_migrations_online
context.run_migrations()
File "<string>", line 8, in
run_migrations
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/runtime/environ
ment.py", line 948, in run_migrations
self.get_context().run_migrations(**k
w)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/runtime/migrati
on.py", line 627, in run_migrations
step.migration_fn(**kw)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/langflow/alembic/versio
ns/3bb0ddf32dfb_add_unique_constraints_pe
r_user_in_flow_.py", line 27, in upgrade
with op.batch_alter_table("flow",
schema=None) as batch_op:
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/contextlib.py", line 142, in __exit__
next(self.gen)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/operations/base
.py", line 398, in batch_alter_table
impl.flush()
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/operations/batc
h.py", line 164, in flush
batch_impl._create(self.impl)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/operations/batc
h.py", line 448, in _create
op_impl.create_table(self.new_table)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/ddl/impl.py",
line 366, in create_table
self._exec(schema.CreateTable(table))
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/alembic/ddl/impl.py",
line 207, in _exec
return conn.execute(construct,
multiparams)
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/base.
py", line 1418, in execute
return meth(
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/sql/ddl.py",
line 180, in _execute_on_connection
return connection._execute_ddl(
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/base.
py", line 1529, in _execute_ddl
ret = self._execute_context(
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/base.
py", line 1846, in _execute_context
return self._exec_single_context(
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/base.
py", line 1986, in _exec_single_context
self._handle_dbapi_exception(
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/base.
py", line 2353, in
_handle_dbapi_exception
raise
sqlalchemy_exception.with_traceback(exc_i
nfo[2]) from e
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/base.
py", line 1967, in _exec_single_context
self.dialect.do_execute(
File
"/opt/anaconda3/envs/langflow/lib/python3
.10/site-packages/sqlalchemy/engine/defau
lt.py", line 924, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError:
(sqlite3.OperationalError) table
_alembic_tmp_flow already exists
[SQL:
CREATE TABLE _alembic_tmp_flow (
name VARCHAR NOT NULL,
description VARCHAR,
icon VARCHAR,
icon_bg_color VARCHAR,
is_component BOOLEAN,
updated_at DATETIME,
id CHAR(32) NOT NULL,
data JSON,
user_id CHAR(32),
folder_id CHAR(32),
endpoint_name VARCHAR,
PRIMARY KEY (id),
CONSTRAINT flow_folder_id_fkey
FOREIGN KEY(folder_id) REFERENCES folder
(id),
CONSTRAINT fk_flow_user_id_user
FOREIGN KEY(user_id) REFERENCES user
(id),
CONSTRAINT
unique_flow_endpoint_name UNIQUE
(user_id, endpoint_name),
CONSTRAINT unique_flow_name
UNIQUE (user_id, name),
UNIQUE (id)
)
]
(Background on this error at:
https://sqlalche.me/e/20/e3q8)
ERROR 2024-06-11 11:59:19 - ERROR - on - on.py:59
Application startup failed. Exiting.
[06/11/24 11:59:19] ERROR 2024-06-11 11:59:19 - ERROR - glogging.py:272
glogging - Worker (pid:1427) exited
with code 3
ERROR 2024-06-11 11:59:19 - ERROR - glogging.py:272
glogging - Shutting down: Master
ERROR 2024-06-11 11:59:19 - ERROR - glogging.py:272
glogging - Reason: Worker failed to
boot.
`
Hey @NeoVand! I'm here to help you with any bugs, questions, or contributions while you wait for a human maintainer. Let's tackle this together!
To resolve the error related to the temporary table (_alembic_tmp_flow) already existing in the SQLite database when attempting to run Langflow (version v1.0.0a50), you can modify the Alembic migration script to handle the existence of the temporary table. Here is an updated version of the upgrade
function that includes a check for the existence of the temporary table and drops it if it exists:
def upgrade() -> None:
conn = op.get_bind()
inspector = Inspector.from_engine(conn) # type: ignore
# Check if the temporary table exists and drop it if it does
if inspector.has_table('_alembic_tmp_flow'):
op.execute('DROP TABLE _alembic_tmp_flow')
# ### commands auto generated by Alembic - please adjust! ###
indexes_names = [index["name"] for index in inspector.get_indexes("flow")]
constraints_names = [constraint["name"] for constraint in inspector.get_unique_constraints("flow")]
with op.batch_alter_table("flow", schema=None) as batch_op:
if "ix_flow_endpoint_name" in indexes_names:
batch_op.drop_index("ix_flow_endpoint_name")
batch_op.create_index(batch_op.f("ix_flow_endpoint_name"), ["endpoint_name"], unique=False)
if "unique_flow_endpoint_name" not in constraints_names:
batch_op.create_unique_constraint("unique_flow_endpoint_name", ["user_id", "endpoint_name"])
if "unique_flow_name" not in constraints_names:
batch_op.create_unique_constraint("unique_flow_name", ["user_id", "name"])
# ### end Alembic commands ###
This modification ensures that if the temporary table _alembic_tmp_flow
already exists, it will be dropped before proceeding with the rest of the migration [1].
you can delete langflow.db or langflow-pre.db