Add missing files.
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"""Utilities used at build time and in devserver script. No dependencies."""
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import logging
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import os
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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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class _PrefixFormatter(logging.Formatter):
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"""Formatter that adds prefix based on log level."""
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def format(self, record: logging.LogRecord) -> str:
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if record.levelno >= logging.WARNING:
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return f"⚠️ {record.getMessage()}"
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return record.getMessage()
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_handler = logging.StreamHandler()
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_handler.setFormatter(_PrefixFormatter())
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logger = logging.getLogger("fastapi-vue")
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logger.addHandler(_handler)
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logger.setLevel(logging.INFO)
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def _check_node_version(node_path: str) -> None:
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"""Check if Node.js version is >= 20.
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Raises RuntimeError if version is too old or cannot be determined.
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"""
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try:
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result = subprocess.run(
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[node_path, "--version"], capture_output=True, text=True, check=True
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)
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version_str = result.stdout.strip()
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# Parse version like "v20.10.0" or "v18.17.1"
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match = re.match(r"v(\d+)", version_str)
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if match:
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major_version = int(match.group(1))
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if major_version >= 20:
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return
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raise RuntimeError(
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f"Node.js {version_str} found, but v20+ required (install with nvm)"
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)
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except (subprocess.CalledProcessError, FileNotFoundError, ValueError):
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pass
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raise RuntimeError("Could not determine Node.js version")
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def find_js_runtime() -> tuple[str, str]:
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"""Find a JavaScript runtime from JS_RUNTIME env or auto-detect.
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Returns (tool_path, tool_name) where tool_name is "deno", "npm", or "bun".
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Raises JSRuntimeError if no suitable runtime is found.
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"""
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options = ["npm", "deno", "bun"]
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node_version_error: RuntimeError | None = None
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# Check for JS_RUNTIME environment variable
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if js_runtime_env := os.environ.get("JS_RUNTIME"):
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js_runtime = js_runtime_env
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js_path = Path(js_runtime)
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runtime_name = js_path.name
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# Map node to npm
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if runtime_name == "node":
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runtime_name = "npm"
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js_runtime = str(js_path.parent / "npm") if js_path.parent.name else "npm"
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for option in options:
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if option == runtime_name or runtime_name.startswith(option):
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tool = shutil.which(js_runtime)
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if tool is None:
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raise RuntimeError(
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f"JS_RUNTIME={js_runtime_env}: {option} not found"
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)
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# Check Node.js version if using npm
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if option == "npm":
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node_path = shutil.which("node", path=str(Path(tool).parent))
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if node_path is None:
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raise RuntimeError(
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f"JS_RUNTIME={js_runtime_env}: node not found"
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)
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_check_node_version(node_path) # Raises on failure
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return tool, option
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raise RuntimeError(f"JS_RUNTIME={js_runtime_env} not recognized")
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# Auto-detect
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for option in options:
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if tool := shutil.which(option):
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# Check Node.js version if using npm
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if option == "npm":
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node_path = shutil.which("node", path=str(Path(tool).parent))
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if node_path is None:
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continue
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try:
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_check_node_version(node_path)
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except RuntimeError as e:
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node_version_error = e
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continue # Try next runtime
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return tool, option
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# No runtime found - provide helpful error
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if node_version_error:
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raise node_version_error
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raise RuntimeError("Node.js (v20+), Deno or Bun is required but none was found")
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def find_build_tool():
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"""Find JavaScript runtime and construct install/build commands.
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Returns (install_cmd, build_cmd) tuples of command lists.
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Raises RuntimeError if no runtime is found.
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"""
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install = {
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"deno": ("install", "--allow-scripts=npm:vue-demi"),
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"npm": ("install",),
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"bun": ("--bun", "install"),
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}
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# Run vite directly for deno to avoid npm-run-all2/run-p issues
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build = {
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"deno": ("run", "-A", "npm:vite", "build"),
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"npm": ("run", "build"),
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"bun": ("--bun", "run", "build"),
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}
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tool, name = find_js_runtime()
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return [tool, *install[name]], [tool, *build[name]]
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def find_dev_tool() -> list[str]:
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"""Find JavaScript runtime and construct dev command.
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Returns dev_cmd (without vite-specific args).
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Raises RuntimeError if no runtime is found.
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"""
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dev_args = {
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"deno": ("run", "dev", "--"),
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"npm": ("--silent", "run", "dev", "--"),
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"bun": ("run", "dev", "--"),
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}
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tool, name = find_js_runtime()
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if name == "bun":
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logger.warning(
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"Bun has a bug in WS proxying (https://github.com/oven-sh/bun/issues/9882). Consider using npm instead."
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)
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return [tool, *dev_args[name]]
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def find_install_tool() -> list[str]:
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"""Find JavaScript runtime and construct install command.
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Returns install_cmd.
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Raises RuntimeError if no runtime is found.
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"""
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install_args = {
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"deno": ("install", "--quiet", "--allow-scripts=npm:vue-demi"),
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"npm": ("install", "--silent"),
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"bun": ("install", "--silent"),
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}
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tool, name = find_js_runtime()
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return [tool, *install_args[name]]
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def build(folder: str = "frontend") -> None:
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"""Build the frontend in the specified folder.
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Raises SystemExit(1) on failure.
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"""
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logger.info(">>> Building %s", folder)
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try:
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install_cmd, build_cmd = find_build_tool()
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except RuntimeError as e:
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logger.warning(e)
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raise SystemExit(1)
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def run(cmd):
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display_cmd = [Path(cmd[0]).name, *cmd[1:]]
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logger.info("### %s", " ".join(display_cmd))
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subprocess.run(cmd, check=True, cwd=folder)
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try:
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run(install_cmd)
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logger.info("")
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run(build_cmd)
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except subprocess.CalledProcessError:
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raise SystemExit(1)
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@@ -0,0 +1,197 @@
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"""Utilities meant for devserver script, used only in source repository with dev deps."""
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import asyncio
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import subprocess
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from collections.abc import Coroutine
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from pathlib import Path
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from typing import Any
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import httpx
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from buildutil import find_dev_tool, find_install_tool, logger
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from fastapi_vue.hostutil import parse_endpoint
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DEFAULT_VITE_PORT = 5173
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DEFAULT_BACKEND_PORT = 5180
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class ProcessGroup:
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"""Manage async subprocesses with automatic cleanup, like TaskGroup for processes."""
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def __init__(self):
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self._procs: list[asyncio.subprocess.Process] = []
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self._cmds: dict[int, str] = {} # pid -> command name
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async def spawn(
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self, *cmd: str, cwd: str | None = None
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) -> asyncio.subprocess.Process:
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"""Spawn a subprocess and track it."""
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cmd_name = Path(cmd[0]).name
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logger.info(">>> %s", " ".join([cmd_name, *cmd[1:]]))
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proc = await asyncio.create_subprocess_exec(*cmd, cwd=cwd)
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self._procs.append(proc)
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self._cmds[proc.pid] = cmd_name
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return proc
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async def wait(
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self, *waitables: "asyncio.subprocess.Process | Coroutine[Any, Any, Any]"
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) -> None:
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"""Wait for processes/coroutines to complete, raise SystemExit on failure."""
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async def wait_proc(proc: asyncio.subprocess.Process) -> None:
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returncode = await proc.wait()
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if returncode != 0:
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cmd_name = self._cmds.get(proc.pid, "unknown")
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raise subprocess.CalledProcessError(returncode, cmd_name)
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tasks = [
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wait_proc(w) if isinstance(w, asyncio.subprocess.Process) else w
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for w in waitables
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]
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try:
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await asyncio.gather(*tasks)
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except subprocess.CalledProcessError as e:
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logger.warning("%s failed with exit status %d", e.cmd, e.returncode)
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raise SystemExit(1) from None
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async def __aenter__(self):
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return self
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async def __aexit__(self, exc_type, *_):
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"""Wait for one process to exit, terminate others, then wait for all."""
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cleanup_task = asyncio.create_task(
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self._cleanup(immediate=exc_type is not None)
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)
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try:
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await asyncio.shield(cleanup_task)
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except asyncio.CancelledError:
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# Shield was cancelled but cleanup_task continues - wait for it
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await cleanup_task
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async def _cleanup(self, immediate: bool = False):
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running = [p for p in self._procs if p.returncode is None]
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if not running:
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return
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if not immediate:
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# Wait for any one process to exit
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await asyncio.wait(
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[asyncio.create_task(p.wait()) for p in running],
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return_when=asyncio.FIRST_COMPLETED,
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)
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# Terminate remaining processes
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for p in self._procs:
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if p.returncode is None:
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try:
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p.terminate()
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except ProcessLookupError:
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pass
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# Wait for all to finish (with overall timeout)
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still_running = [p for p in self._procs if p.returncode is None]
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if still_running:
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try:
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await asyncio.wait_for(
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asyncio.gather(*[p.wait() for p in still_running]),
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timeout=10,
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)
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except TimeoutError:
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for p in self._procs:
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if p.returncode is None:
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try:
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p.kill()
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except ProcessLookupError:
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pass
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await p.wait()
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async def check_ports_free(*urls: str) -> None:
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"""Verify URLs are not responding (ports are free). Raise SystemExit if any respond."""
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async with httpx.AsyncClient() as client:
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for url in urls:
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try:
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res = await client.get(url, timeout=0.1)
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logger.warning(
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"Conflicting %s already running at %s",
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res.headers.get("server", "server"),
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url,
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)
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raise SystemExit(1)
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except httpx.RequestError:
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pass # Expected - port is free
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async def ready(url: str, path: str = "") -> None:
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"""Wait for the server to be ready by polling an endpoint.
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Raises SystemExit(1) if server doesn't start in time.
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"""
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max_attempts = 50
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full_url = f"{url}{path}"
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async with httpx.AsyncClient() as client:
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for attempt in range(max_attempts):
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try:
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await client.get(full_url, timeout=1.0)
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logger.info("✓ Backend ready!")
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return
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except httpx.RequestError:
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if attempt == max_attempts - 1:
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logger.warning("Backend didn't start in time")
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raise SystemExit(1)
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await asyncio.sleep(0.1)
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def setup_vite(endpoint: str) -> tuple[str, list[str], list[str]]:
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"""Parse frontend endpoint and build commands.
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Returns (url, install_cmd, dev_cmd).
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Raises SystemExit(1) on invalid config.
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"""
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endpoints = parse_endpoint(endpoint, DEFAULT_VITE_PORT)
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if "uds" in endpoints[0]:
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logger.warning("Unix sockets not supported with vite devserver")
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raise SystemExit(1)
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port = endpoints[0]["port"]
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host = endpoints[0]["host"]
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install_cmd = find_install_tool()
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dev_cmd = find_dev_tool()
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if host != "localhost":
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dev_cmd.append("--host" if len(endpoints) > 1 else f"--host={host}")
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if port != 5173:
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dev_cmd.append(f"--port={port}")
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return f"http://{host}:{port}", install_cmd, dev_cmd
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def setup_fastapi(
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endpoint: str, module: str, default_port: int = DEFAULT_BACKEND_PORT
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) -> tuple[str, list[str]]:
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"""Parse backend endpoint and build fastapi dev command.
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Returns (url, cmd).
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Raises SystemExit(1) on invalid config.
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"""
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endpoints = parse_endpoint(endpoint, default_port)
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if "uds" in endpoints[0]:
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logger.warning("Unix sockets not supported with vite devserver")
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raise SystemExit(1)
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host = endpoints[0]["host"]
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port = endpoints[0]["port"]
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cmd = [
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"fastapi",
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"dev",
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"--entrypoint",
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module,
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"--host",
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host,
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"--port",
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str(port),
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]
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return f"http://{host}:{port}", cmd
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