Global variables implementation (#1548)

This PR is related to the Global Variables functionality.


![image](https://github.com/logspace-ai/langflow/assets/62335616/0829db58-c26c-499f-9d59-c11fa0a1cf5b)
When clicking the Globe, it's possible to use global variables in any
InputComponent.
When hovering an item, it's possible to delete it.
When clicking on Add New Variable, it's possible to add a new global
variable.

.github/workflows/lint.yml

@@ -14,15 +14,14 @@ on:
  - "src/backend/**"
 
 env:
- POETRY_VERSION: "1.7.0"
+ POETRY_VERSION: "1.8.2"
 
 jobs:
  lint:
  runs-on: ubuntu-latest
  strategy:
  matrix:
  python-version:
- - "3.9"
  - "3.10"
  - "3.11"
  steps:

Makefile

@@ -46,7 +46,7 @@ format:
 
 lint:
  make install_backend
- poetry run mypy src/backend
+ poetry run mypy --namespace-packages -p "langflow"
  poetry run ruff . --fix
 
 install_frontend:

base.Dockerfile

@@ -23,7 +23,7 @@ ENV PYTHONUNBUFFERED=1 \
  \
  # poetry
  # https://python-poetry.org/docs/configuration/#using-environment-variables
- POETRY_VERSION=1.7.1 \
+ POETRY_VERSION=1.8.2 \
  # make poetry install to this location
  POETRY_HOME="/opt/poetry" \
  # make poetry create the virtual environment in the project's root

build_and_push.Dockerfile

@@ -23,7 +23,7 @@ ENV PYTHONUNBUFFERED=1 \
  \
  # poetry
  # https://python-poetry.org/docs/configuration/#using-environment-variables
- POETRY_VERSION=1.7.1 \
+ POETRY_VERSION=1.8.2 \
  # make poetry install to this location
  POETRY_HOME="/opt/poetry" \
  # make poetry create the virtual environment in the project's root

deploy/base.Dockerfile

@@ -23,7 +23,7 @@ ENV PYTHONUNBUFFERED=1 \
  \
  # poetry
  # https://python-poetry.org/docs/configuration/#using-environment-variables
- POETRY_VERSION=1.5.1 \
+ POETRY_VERSION=1.8.2 \
  # make poetry install to this location
  POETRY_HOME="/opt/poetry" \
  # make poetry create the virtual environment in the project's root

src/backend/base/langflow/__main__.py

@@ -285,7 +285,12 @@ def run_langflow(host, port, log_level, options, app):
  # MacOS requires an env variable to be set to use gunicorn
  import uvicorn
 
- uvicorn.run(app, host=host, port=port, log_level=log_level)
+ uvicorn.run(
+ app,
+ host=host,
+ port=port,
+ log_level=log_level.lower(),
+ )
  else:
  from langflow.server import LangflowApplication
 

src/backend/base/langflow/alembic/versions/1a110b568907_replace_credential_table_with_variable.py

@@ -0,0 +1,65 @@
+"""Replace Credential table with Variable
+
+Revision ID: 1a110b568907
+Revises: 63b9c451fd30
+Create Date: 2024-03-25 09:40:02.743453
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+import sqlmodel
+from alembic import op
+from sqlalchemy.engine.reflection import Inspector
+
+# revision identifiers, used by Alembic.
+revision: str = "1a110b568907"
+down_revision: Union[str, None] = "63b9c451fd30"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+ conn = op.get_bind()
+ inspector = Inspector.from_engine(conn) # type: ignore
+ table_names = inspector.get_table_names()
+ # ### commands auto generated by Alembic - please adjust! ###
+ if "variable" not in table_names:
+ op.create_table(
+ "variable",
+ sa.Column("name", sqlmodel.sql.sqltypes.AutoString(), nullable=True),
+ sa.Column("value", sqlmodel.sql.sqltypes.AutoString(), nullable=True),
+ sa.Column("type", sqlmodel.sql.sqltypes.AutoString(), nullable=True),
+ sa.Column("id", sqlmodel.sql.sqltypes.GUID(), nullable=False),
+ sa.Column("created_at", sa.DateTime(), nullable=False),
+ sa.Column("updated_at", sa.DateTime(), nullable=True),
+ sa.Column("user_id", sqlmodel.sql.sqltypes.GUID(), nullable=False),
+ sa.ForeignKeyConstraint(["user_id"], ["user.id"], name="fk_variable_user_id"),
+ sa.PrimaryKeyConstraint("id"),
+ )
+ if "credential" in table_names:
+ op.drop_table("credential")
+ # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+ conn = op.get_bind()
+ inspector = Inspector.from_engine(conn) # type: ignore
+ table_names = inspector.get_table_names()
+ # ### commands auto generated by Alembic - please adjust! ###
+ if "credential" not in table_names:
+ op.create_table(
+ "credential",
+ sa.Column("name", sa.VARCHAR(), nullable=True),
+ sa.Column("value", sa.VARCHAR(), nullable=True),
+ sa.Column("provider", sa.VARCHAR(), nullable=True),
+ sa.Column("user_id", sa.CHAR(length=32), nullable=False),
+ sa.Column("id", sa.CHAR(length=32), nullable=False),
+ sa.Column("created_at", sa.DATETIME(), nullable=False),
+ sa.Column("updated_at", sa.DATETIME(), nullable=True),
+ sa.ForeignKeyConstraint(["user_id"], ["user.id"], name="fk_credential_user_id"),
+ sa.PrimaryKeyConstraint("id"),
+ )
+ if "variable" in table_names:
+ op.drop_table("variable")
+ # ### end Alembic commands ###

src/backend/base/langflow/api/router.py

@@ -4,7 +4,6 @@
 from langflow.api.v1 import (
  api_key_router,
  chat_router,
- credentials_router,
  endpoints_router,
  files_router,
  flows_router,
@@ -13,6 +12,7 @@
  store_router,
  users_router,
  validate_router,
+ variables_router,
 )
 
 router = APIRouter(
@@ -26,6 +26,6 @@
 router.include_router(users_router)
 router.include_router(api_key_router)
 router.include_router(login_router)
-router.include_router(credentials_router)
+router.include_router(variables_router)
 router.include_router(files_router)
 router.include_router(monitor_router)