mirror of
https://github.com/langchain-ai/langgraph.git
synced 2026-08-20 14:42:28 +02:00
75 lines
2.0 KiB
Python
75 lines
2.0 KiB
Python
"""User-facing entrypoint for the LangGraph CLI."""
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from __future__ import annotations
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import os
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import pathlib
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import sys
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from collections.abc import Sequence
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import click
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from .cli import cli
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_GO_CLI_FLAG = "LANGGRAPH_USE_GO_CLI"
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_GO_CLI_PATH_ENV = "LANGGRAPH_GO_CLI_PATH"
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_CALLING_PYTHON_ENV = "LANGGRAPH_CALLING_PYTHON"
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_TRUE_VALUES = frozenset({"1", "true", "yes", "on"})
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def _legacy_cli(argv: Sequence[str] | None = None) -> None:
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cli.main(args=list(argv) if argv is not None else None, prog_name="langgraph")
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def _should_use_go_cli() -> bool:
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value = os.environ.get(_GO_CLI_FLAG, "")
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return value.strip().lower() in _TRUE_VALUES
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def _bundled_go_cli_path() -> pathlib.Path:
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binary_name = "langgraph.exe" if os.name == "nt" else "langgraph"
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return pathlib.Path(__file__).resolve().parent / "bin" / binary_name
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def _resolve_go_cli_path() -> pathlib.Path | None:
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override = os.environ.get(_GO_CLI_PATH_ENV)
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if override:
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path = pathlib.Path(override).expanduser()
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return path.resolve()
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bundled = _bundled_go_cli_path()
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if bundled.is_file():
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return bundled
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return None
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def _exec_go_cli(argv: Sequence[str]) -> None:
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path = _resolve_go_cli_path()
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if path is None:
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raise click.ClickException(
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"Go CLI requested via LANGGRAPH_USE_GO_CLI, but no langgraph binary was "
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"found. Set LANGGRAPH_GO_CLI_PATH or install a wheel that bundles the "
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"binary."
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)
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if not path.is_file():
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raise click.ClickException(
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f"LANGGRAPH_GO_CLI_PATH points to a missing file: {path}"
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)
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env = os.environ.copy()
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env.setdefault(_CALLING_PYTHON_ENV, sys.executable)
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os.execvpe(str(path), [str(path), *argv], env)
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def main(argv: Sequence[str] | None = None) -> None:
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args = list(sys.argv[1:] if argv is None else argv)
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try:
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if _should_use_go_cli():
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_exec_go_cli(args)
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_legacy_cli(args)
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except click.ClickException as exc:
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exc.show()
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raise SystemExit(exc.exit_code) from exc
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