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import importlib
from typing import Optional
import typer
from typing_extensions import Annotated
from langchain_cli.namespaces import app as app_namespace
from langchain_cli.namespaces import integration as integration_namespace
from langchain_cli.namespaces import template as template_namespace
from langchain_cli.utils.packages import get_langserve_export, get_package_root
__version__ = "0.0.22rc0"
app = typer.Typer(no_args_is_help=True, add_completion=False)
app.add_typer(
template_namespace.package_cli, name="template", help=template_namespace.__doc__
)
app.add_typer(app_namespace.app_cli, name="app", help=app_namespace.__doc__)
app.add_typer(
integration_namespace.integration_cli,
name="integration",
help=integration_namespace.__doc__,
)
# If libcst is installed, add the migrate namespace
if importlib.util.find_spec("libcst"):
from langchain_cli.namespaces.migrate import main as migrate_namespace
app.add_typer(migrate_namespace.app, name="migrate", help=migrate_namespace.__doc__)
def version_callback(show_version: bool) -> None:
if show_version:
typer.echo(f"langchain-cli {__version__}")
raise typer.Exit()
@app.callback()
def main(
version: bool = typer.Option(
False,
"--version",
"-v",
help="Print the current CLI version.",
callback=version_callback,
is_eager=True,
),
):
pass
@app.command()
def serve(
*,
port: Annotated[
Optional[int], typer.Option(help="The port to run the server on")
] = None,
host: Annotated[
Optional[str], typer.Option(help="The host to run the server on")
] = None,
) -> None:
"""
Start the LangServe app, whether it's a template or an app.
"""
# see if is a template
try:
project_dir = get_package_root()
pyproject = project_dir / "pyproject.toml"
get_langserve_export(pyproject)
except KeyError:
# not a template
app_namespace.serve(port=port, host=host)
else:
# is a template
template_namespace.serve(port=port, host=host)
if __name__ == "__main__":
app()
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