generated from Luis/nextjs-python-web-template
114 lines
3.1 KiB
Python
114 lines
3.1 KiB
Python
import asyncio
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import json
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import shlex
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from typing import Annotated, AsyncIterator
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from fastapi import APIRouter, Body, HTTPException, Request, status
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from fastapi.encoders import jsonable_encoder
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from fastapi.responses import JSONResponse, StreamingResponse
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from ...nix import nix_build, nix_eval
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from ..schemas import VmConfig, VmInspectResponse
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router = APIRouter()
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class NixBuildException(HTTPException):
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def __init__(self, msg: str, loc: list = ["body", "flake_attr"]):
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detail = [
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{
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"loc": loc,
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"msg": msg,
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"type": "value_error",
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}
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]
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super().__init__(
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status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=detail
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)
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def nix_build_exception_handler(
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request: Request, exc: NixBuildException
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) -> JSONResponse:
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return JSONResponse(
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status_code=exc.status_code,
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content=jsonable_encoder(dict(detail=exc.detail)),
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)
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def nix_inspect_vm(machine: str, flake_url: str) -> list[str]:
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return nix_eval(
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[
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f"{flake_url}#nixosConfigurations.{json.dumps(machine)}.config.system.clan.vm.config"
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]
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)
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def nix_build_vm(machine: str, flake_url: str) -> list[str]:
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return nix_build(
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[
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f"{flake_url}#nixosConfigurations.{json.dumps(machine)}.config.system.build.vm"
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]
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)
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@router.post("/api/vms/inspect")
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async def inspect_vm(
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flake_url: Annotated[str, Body()], flake_attr: Annotated[str, Body()]
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) -> VmInspectResponse:
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cmd = nix_inspect_vm(flake_attr, flake_url=flake_url)
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proc = await asyncio.create_subprocess_exec(
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cmd[0],
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*cmd[1:],
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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)
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stdout, stderr = await proc.communicate()
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if proc.returncode != 0:
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raise NixBuildException(
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f"""
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Failed to evaluate vm from '{flake_url}#{flake_attr}'.
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command: {shlex.join(cmd)}
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exit code: {proc.returncode}
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command output:
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{stderr.decode("utf-8")}
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"""
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)
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data = json.loads(stdout)
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return VmInspectResponse(
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config=VmConfig(flake_url=flake_url, flake_attr=flake_attr, **data)
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)
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async def vm_build(vm: VmConfig) -> AsyncIterator[str]:
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cmd = nix_build_vm(vm.flake_attr, flake_url=vm.flake_url)
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proc = await asyncio.create_subprocess_exec(
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cmd[0],
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*cmd[1:],
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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)
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assert proc.stdout is not None and proc.stderr is not None
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async for line in proc.stdout:
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yield line.decode("utf-8", "ignore")
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stderr = ""
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async for line in proc.stderr:
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stderr += line.decode("utf-8", "ignore")
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res = await proc.wait()
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if res != 0:
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raise NixBuildException(
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f"""
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Failed to build vm from '{vm.flake_url}#{vm.flake_attr}'.
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command: {shlex.join(cmd)}
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exit code: {res}
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command output:
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{stderr}
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"""
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)
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@router.post("/api/vms/create")
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async def create_vm(vm: Annotated[VmConfig, Body()]) -> StreamingResponse:
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return StreamingResponse(vm_build(vm))
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