mirror of
https://github.com/hwchase17/langchain
synced 2024-11-10 01:10:59 +00:00
118 lines
3.2 KiB
Python
118 lines
3.2 KiB
Python
"""
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Develop installable templates.
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"""
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import re
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import shutil
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import subprocess
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from pathlib import Path
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from typing import Optional
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import typer
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from langserve.packages import get_langserve_export
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from typing_extensions import Annotated
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from langchain_cli.utils.packages import get_package_root
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package_cli = typer.Typer(no_args_is_help=True, add_completion=False)
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@package_cli.command()
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def new(
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name: Annotated[str, typer.Argument(help="The name of the folder to create")],
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with_poetry: Annotated[
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bool,
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typer.Option("--with-poetry/--no-poetry", help="Don't run poetry install"),
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] = False,
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):
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"""
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Creates a new template package.
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"""
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computed_name = name if name != "." else Path.cwd().name
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destination_dir = Path.cwd() / name if name != "." else Path.cwd()
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# copy over template from ../package_template
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project_template_dir = Path(__file__).parents[1] / "package_template"
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shutil.copytree(project_template_dir, destination_dir, dirs_exist_ok=name == ".")
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package_name_split = computed_name.split("/")
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package_name = (
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package_name_split[-2]
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if len(package_name_split) > 1 and package_name_split[-1] == ""
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else package_name_split[-1]
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)
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module_name = re.sub(
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r"[^a-zA-Z0-9_]",
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"_",
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package_name,
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)
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# generate app route code
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chain_name = f"{module_name}_chain"
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app_route_code = (
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f"from {module_name} import chain as {chain_name}\n\n"
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f'add_routes(app, {chain_name}, path="/{package_name}")'
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)
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# replace template strings
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pyproject = destination_dir / "pyproject.toml"
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pyproject_contents = pyproject.read_text()
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pyproject.write_text(
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pyproject_contents.replace("__package_name__", module_name).replace(
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"__module_name__", module_name
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)
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)
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# move module folder
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package_dir = destination_dir / module_name
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shutil.move(destination_dir / "package_template", package_dir)
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# replace readme
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readme = destination_dir / "README.md"
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readme_contents = readme.read_text()
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readme.write_text(
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readme_contents.replace("__package_name_last__", package_name).replace(
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"__app_route_code__", app_route_code
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)
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)
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# poetry install
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if with_poetry:
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subprocess.run(["poetry", "install"], cwd=destination_dir)
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@package_cli.command()
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def serve(
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*,
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port: Annotated[
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Optional[int], typer.Option(help="The port to run the server on")
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] = None,
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host: Annotated[
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Optional[str], typer.Option(help="The host to run the server on")
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] = None,
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) -> None:
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"""
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Starts a demo app for this template.
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"""
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# load pyproject.toml
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project_dir = get_package_root()
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pyproject = project_dir / "pyproject.toml"
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# get langserve export - throws KeyError if invalid
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get_langserve_export(pyproject)
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port_str = str(port) if port is not None else "8000"
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host_str = host if host is not None else "127.0.0.1"
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command = [
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"uvicorn",
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"--factory",
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"langchain_cli.dev_scripts:create_demo_server",
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"--reload",
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"--port",
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port_str,
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"--host",
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host_str,
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]
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subprocess.run(command)
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