167 lines
4.5 KiB
Python
167 lines
4.5 KiB
Python
import asyncio
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import json
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import logging
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import shlex
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import io
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import subprocess
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import pipes
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import threading
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from typing import Annotated, AsyncIterator
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from uuid import UUID, uuid4
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from fastapi import (
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APIRouter,
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BackgroundTasks,
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Body,
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HTTPException,
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Request,
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status,
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)
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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, VmCreateResponse, VmInspectResponse, VmStatusResponse
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from ..task_manager import BaseTask, get_task, register_task
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log = logging.getLogger(__name__)
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router = APIRouter()
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def nix_inspect_vm_cmd(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_cmd(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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class NixBuildException(HTTPException):
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def __init__(self, uuid: UUID, msg: str, loc: list = ["body", "flake_attr"]):
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self.uuid = uuid
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detail = [
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{
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"loc": loc,
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"uuid": str(uuid),
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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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class BuildVmTask(BaseTask):
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def __init__(self, uuid: UUID, vm: VmConfig) -> None:
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super().__init__(uuid)
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self.vm = vm
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def run(self) -> None:
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try:
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self.log.debug(f"BuildVM with uuid {self.uuid} started")
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cmd = nix_build_vm_cmd(self.vm.flake_attr, flake_url=self.vm.flake_url)
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proc = self.run_cmd(cmd)
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self.log.debug(f"stdout: {proc.stdout}")
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vm_path = f"{''.join(proc.stdout[0])}/bin/run-nixos-vm"
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self.log.debug(f"vm_path: {vm_path}")
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self.run_cmd(vm_path)
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self.finished = True
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except Exception as e:
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self.failed = True
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self.finished = True
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log.exception(e)
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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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log.error("NixBuildException: %s", exc)
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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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##################################
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# #
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# ======== VM ROUTES ======== #
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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_cmd(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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""
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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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@router.get("/api/vms/{uuid}/status")
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async def get_status(uuid: str) -> VmStatusResponse:
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task = get_task(uuid)
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return VmStatusResponse(running=not task.finished, status=0)
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@router.get("/api/vms/{uuid}/logs")
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async def get_logs(uuid: str) -> StreamingResponse:
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async def stream_logs() -> AsyncIterator[str]:
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task = get_task(uuid)
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for proc in task.procs:
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if proc.done:
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for line in proc.stderr:
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yield line
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for line in proc.stdout:
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yield line
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else:
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while True:
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if proc.output_pipe.empty() and proc.done:
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break
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line = await proc.output_pipe.get()
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yield line
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return StreamingResponse(
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content=stream_logs(),
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media_type="text/plain",
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)
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@router.post("/api/vms/create")
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async def create_vm(
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vm: Annotated[VmConfig, Body()], background_tasks: BackgroundTasks
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) -> VmCreateResponse:
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uuid = register_task(BuildVmTask, vm)
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return VmCreateResponse(uuid=str(uuid))
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