mirror of
https://github.com/NousResearch/hermes-agent.git
synced 2026-05-03 02:11:48 +00:00
652 lines
24 KiB
Python
652 lines
24 KiB
Python
"""
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SlotPool - Manages slots across Nomad allocations.
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The SlotPool is the core abstraction for slot-based multiplexing:
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- Tracks available/acquired slots across containers
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- Handles slot acquisition and release
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- Auto-scales Nomad job count based on demand
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- Provides batched tool execution
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"""
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import asyncio
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import logging
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import os
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import subprocess
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from dataclasses import dataclass, field
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from pathlib import Path
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from typing import Any, Dict, List, Optional, Tuple
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from ..nomad.client import (
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Allocation,
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AllocationStatus,
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NomadClient,
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create_sandbox_job,
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)
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from .executor import ExecutionResult, SandboxExecutor
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from .slot import Slot, SlotState, create_slots_for_allocation
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logger = logging.getLogger(__name__)
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@dataclass
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class SlotPoolConfig:
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"""Configuration for SlotPool."""
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# Nomad settings
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nomad_address: str = "http://localhost:4646"
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job_id: str = "atropos-sandbox"
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datacenter: str = "dc1"
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# Container settings
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image: str = "atropos-sandbox:local" # Use :local tag to avoid registry pull
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slots_per_container: int = 10
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privileged: bool = False
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cpu: int = 500 # MHz
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memory: int = 512 # MB
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# Scaling settings
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min_containers: int = 1
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max_containers: int = 10
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# Timeouts
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acquire_timeout: float = 30.0 # Seconds between acquire polls (also triggers scale-up attempts)
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health_check_interval: float = 30.0 # Seconds between health checks
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scale_cooldown: float = 60.0 # Seconds between scale operations
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# Job lifecycle
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purge_job_on_start: bool = False # Purge any pre-existing job before starting (local dev/training friendly)
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# Local Docker image convenience (macOS/Nomad dev mode)
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auto_build_local_image: bool = True # If image endswith :local and is missing, build it from the bundled Dockerfile.
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dockerfile_path: Optional[str] = None # Override Dockerfile path (default: Hermes-Agent/atropos/Dockerfile).
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docker_build_context: Optional[str] = None # Override build context (default: Hermes-Agent/atropos).
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class SlotPool:
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"""
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Manages a pool of slots across Nomad allocations.
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The SlotPool:
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- Deploys sandbox containers to Nomad
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- Tracks slots across all running containers
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- Handles slot acquisition/release
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- Auto-scales based on demand
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- Provides batched execution via SandboxExecutor
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Usage:
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config = SlotPoolConfig(
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nomad_address="http://localhost:4646",
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job_id="my-sandbox",
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slots_per_container=10,
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)
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pool = SlotPool(config)
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await pool.start()
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# Acquire a slot
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slot = await pool.acquire()
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# Execute tool
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result = await pool.execute(slot, "bash", {"command": "ls"})
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# Release slot
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await pool.release(slot)
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# Shutdown
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await pool.stop()
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"""
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def __init__(self, config: Optional[SlotPoolConfig] = None):
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self.config = config or SlotPoolConfig()
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# Nomad client
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self.nomad = NomadClient(address=self.config.nomad_address)
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# Sandbox executor for tool execution
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self.executor = SandboxExecutor()
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# Slot tracking
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self._slots: Dict[str, Slot] = {} # slot_key -> Slot
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self._available_queue: asyncio.Queue[str] = asyncio.Queue()
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self._lock = asyncio.Lock()
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self._scale_lock = asyncio.Lock()
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# State
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self._started = False
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self._health_task: Optional[asyncio.Task] = None
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self._scale_task: Optional[asyncio.Task] = None
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self._last_scale_time = 0.0
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def _default_dockerfile_path(self) -> Path:
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# Hermes-Agent/atropos/Dockerfile lives next to this module in source checkouts.
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return Path(__file__).resolve().parents[1] / "Dockerfile"
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def _default_build_context(self) -> Path:
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return Path(__file__).resolve().parents[1]
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def _docker_image_exists(self, image: str) -> bool:
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try:
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proc = subprocess.run(
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["docker", "image", "inspect", image],
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stdout=subprocess.DEVNULL,
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stderr=subprocess.DEVNULL,
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check=False,
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env={**os.environ, "DOCKER_CLI_HINTS": "false"},
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)
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return proc.returncode == 0
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except FileNotFoundError:
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return False
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def _try_build_local_image(self, image: str) -> None:
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dockerfile = Path(self.config.dockerfile_path) if self.config.dockerfile_path else self._default_dockerfile_path()
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context = Path(self.config.docker_build_context) if self.config.docker_build_context else self._default_build_context()
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if not dockerfile.exists():
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raise RuntimeError(
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f"Sandbox Dockerfile not found at {dockerfile}. "
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"Build the sandbox image manually or set --env.purge_job_on_start false and provide a non-local image."
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)
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if not context.exists():
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raise RuntimeError(f"Docker build context not found at {context}")
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# Prefer buildx+--load to ensure the image ends up in the local daemon (required by Nomad's docker driver).
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buildx_cmd = [
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"docker",
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"buildx",
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"build",
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"--load",
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"-t",
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image,
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"-f",
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str(dockerfile),
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str(context),
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]
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proc = subprocess.run(buildx_cmd, check=False, env={**os.environ, "DOCKER_CLI_HINTS": "false"})
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if proc.returncode == 0:
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return
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# Fallback to classic docker build if buildx isn't available.
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build_cmd = ["docker", "build", "-t", image, "-f", str(dockerfile), str(context)]
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proc2 = subprocess.run(build_cmd, check=False, env={**os.environ, "DOCKER_CLI_HINTS": "false"})
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if proc2.returncode != 0:
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raise RuntimeError(
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f"Failed to build local sandbox image {image}. "
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f"Tried: {' '.join(buildx_cmd)} and {' '.join(build_cmd)}"
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)
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def _ensure_local_image(self) -> None:
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image = (self.config.image or "").strip()
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if not image.endswith(":local"):
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return
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if not self.config.auto_build_local_image:
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return
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if self._docker_image_exists(image):
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return
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logger.info(f"Local sandbox image {image} not found; building it now...")
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self._try_build_local_image(image)
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def _slot_key(self, alloc_id: str, slot_id: str) -> str:
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"""Generate unique key for a slot."""
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return f"{alloc_id}:{slot_id}"
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@property
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def total_slots(self) -> int:
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"""Total number of slots in pool."""
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return len(self._slots)
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@property
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def available_slots(self) -> int:
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"""Number of available slots."""
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return sum(1 for s in self._slots.values() if s.is_available)
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@property
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def acquired_slots(self) -> int:
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"""Number of acquired slots."""
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return sum(1 for s in self._slots.values() if s.is_acquired)
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async def start(self) -> None:
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"""
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Start the slot pool.
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- Checks if Nomad is healthy
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- Deploys sandbox job if not running
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- Discovers existing allocations
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- Starts health check background task
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"""
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if self._started:
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return
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logger.info(f"Starting SlotPool (job_id={self.config.job_id})")
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try:
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# Make sure local sandbox images exist before Nomad tries to pull them.
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# This is a common footgun in macOS dev mode with :local tags.
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self._ensure_local_image()
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# Check Nomad health
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if not await self.nomad.is_healthy():
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raise RuntimeError(f"Nomad is not reachable at {self.config.nomad_address}")
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if self.config.purge_job_on_start:
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logger.info(f"Purging any existing Nomad job: {self.config.job_id}")
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await self.nomad.stop_job(self.config.job_id, purge=True)
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# Check if job exists (after optional purge)
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job = await self.nomad.get_job(self.config.job_id)
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if job is None:
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# Deploy new job
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logger.info(f"Deploying sandbox job: {self.config.job_id}")
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job_spec = create_sandbox_job(
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job_id=self.config.job_id,
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image=self.config.image,
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count=self.config.min_containers,
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slots_per_container=self.config.slots_per_container,
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privileged=self.config.privileged,
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cpu=self.config.cpu,
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memory=self.config.memory,
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datacenter=self.config.datacenter,
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)
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result = await self.nomad.submit_job(job_spec)
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if "error" in result:
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raise RuntimeError(f"Failed to submit job: {result}")
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# Wait for allocations to be running (even if the job already existed).
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await self._wait_for_healthy_allocations(self.config.min_containers)
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# Discover existing allocations and slots
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await self._refresh_slots()
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# Start health check task
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self._health_task = asyncio.create_task(self._health_check_loop())
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self._started = True
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logger.info(f"SlotPool started: {self.total_slots} slots available")
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except Exception:
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# Ensure aiohttp sessions are not leaked if we fail to start.
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await self.stop(purge_job=False)
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raise
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async def stop(self, purge_job: bool = False) -> None:
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"""
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Stop the slot pool.
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Args:
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purge_job: If True, also stop the Nomad job
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"""
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logger.info("Stopping SlotPool")
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# Cancel health check task
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if self._health_task:
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self._health_task.cancel()
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try:
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await self._health_task
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except asyncio.CancelledError:
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pass
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finally:
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self._health_task = None
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if self._scale_task:
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self._scale_task.cancel()
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try:
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await self._scale_task
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except asyncio.CancelledError:
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pass
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finally:
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self._scale_task = None
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# Optionally stop the job (do this even if start() never completed).
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if purge_job:
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logger.info(f"Stopping Nomad job: {self.config.job_id}")
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await self.nomad.stop_job(self.config.job_id, purge=True)
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# Close connections
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await self.executor.close()
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await self.nomad.close()
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self._started = False
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self._slots.clear()
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# Clear the queue
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while not self._available_queue.empty():
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try:
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self._available_queue.get_nowait()
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except asyncio.QueueEmpty:
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break
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async def acquire(self, trajectory_id: Optional[str] = None) -> Slot:
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"""
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Acquire an available slot.
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If no slots are available, waits up to acquire_timeout seconds.
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If still no slots, attempts to scale up.
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Args:
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trajectory_id: Optional ID of trajectory acquiring the slot
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Returns:
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Acquired Slot
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Raises:
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asyncio.TimeoutError: If no slot becomes available
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"""
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if not self._started:
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raise RuntimeError("SlotPool not started")
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while True:
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try:
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# Try to get an available slot
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slot_key = await asyncio.wait_for(
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self._available_queue.get(),
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timeout=self.config.acquire_timeout,
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)
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except asyncio.TimeoutError:
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# Try to scale up, but keep waiting even if scaling isn't possible.
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# In practice, slots may become available shortly (e.g. contention),
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# and scaling may be temporarily blocked by Nomad deployments.
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await self._try_scale_up()
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continue
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slot = self._slots.get(slot_key)
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if slot is None:
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# Slot was removed; discard stale queue entry and retry.
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continue
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try:
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slot.acquire(trajectory_id)
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except RuntimeError:
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# Slot isn't actually available (e.g. duplicate queue entry); retry.
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continue
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logger.debug(f"Acquired slot {slot.slot_id} (alloc={slot.alloc_id[:8]})")
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return slot
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async def release(self, slot: Slot, reset_workspace: bool = False) -> None:
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"""
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Release a slot back to the pool.
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Args:
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slot: Slot to release
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reset_workspace: If True, clear the workspace files
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"""
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slot_key = self._slot_key(slot.alloc_id, slot.slot_id)
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if slot_key not in self._slots:
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logger.warning(f"Releasing unknown slot: {slot_key}")
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return
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# Optionally reset workspace
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if reset_workspace:
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await self.executor.reset_slot(slot)
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slot.release()
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await self._available_queue.put(slot_key)
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logger.debug(f"Released slot {slot.slot_id}")
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async def execute(
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self,
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slot: Slot,
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tool_name: str,
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args: Dict[str, Any],
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timeout: Optional[float] = None,
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) -> ExecutionResult:
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"""
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Execute a tool in a slot's workspace.
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Args:
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slot: Slot to execute in
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tool_name: Name of tool (bash, read_file, write_file)
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args: Tool arguments
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timeout: Optional timeout override
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Returns:
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ExecutionResult
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"""
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return await self.executor.execute(slot, tool_name, args, timeout)
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async def execute_batch(
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self,
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requests: List[Tuple[Slot, str, Dict[str, Any]]],
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timeout: Optional[float] = None,
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) -> List[ExecutionResult]:
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"""
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Execute multiple tools in parallel.
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This is the key optimization - batch execution across multiple slots
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maximizes container utilization.
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Args:
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requests: List of (slot, tool_name, args) tuples
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timeout: Optional timeout override
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Returns:
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List of ExecutionResults in same order
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"""
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return await self.executor.execute_batch(requests, timeout)
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async def _refresh_slots(self) -> None:
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"""Refresh slot inventory from Nomad allocations."""
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async with self._lock:
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allocs = await self.nomad.get_job_allocations(self.config.job_id)
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# Track which slots we've seen
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seen_keys = set()
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for alloc in allocs:
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if alloc.status != AllocationStatus.RUNNING:
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continue
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if not alloc.http_address:
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continue
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# Check container health
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healthy = await self.executor.health_check(alloc.http_address)
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if not healthy:
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continue
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# Create slots for this allocation
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for i in range(self.config.slots_per_container):
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slot_id = f"slot_{i}"
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slot_key = self._slot_key(alloc.id, slot_id)
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seen_keys.add(slot_key)
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if slot_key not in self._slots:
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# New slot
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slot = Slot(
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slot_id=slot_id,
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alloc_id=alloc.id,
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container_addr=alloc.http_address,
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)
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self._slots[slot_key] = slot
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await self._available_queue.put(slot_key)
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logger.debug(f"Added slot: {slot_key}")
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# Remove slots from dead allocations
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for slot_key in list(self._slots.keys()):
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if slot_key not in seen_keys:
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slot = self._slots.pop(slot_key)
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logger.debug(f"Removed slot: {slot_key}")
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async def _wait_for_healthy_allocations(
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self,
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min_count: int,
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timeout: float = 120.0
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) -> None:
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"""Wait for allocations to become healthy."""
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import time
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start = time.time()
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def _summarize_alloc_detail(detail: Dict[str, Any]) -> str:
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task_states = detail.get("TaskStates") or {}
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parts: List[str] = []
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if isinstance(task_states, dict):
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for task_name, st in task_states.items():
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events = (st or {}).get("Events") or []
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if isinstance(events, list) and events:
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# Include a few recent events; the latest can be a generic restart message
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# while the true root cause is slightly earlier (e.g. image pull failure).
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recent = events[-3:]
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msgs: List[str] = []
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for ev in recent:
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desc = ev.get("DisplayMessage") or ev.get("Message") or ev.get("Type") or ""
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if desc:
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msgs.append(desc)
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if msgs:
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parts.append(f"{task_name}: " + " | ".join(msgs))
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return "; ".join(parts)
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def _alloc_events_lower(detail: Dict[str, Any]) -> str:
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task_states = detail.get("TaskStates") or {}
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texts: List[str] = []
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if isinstance(task_states, dict):
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for _task_name, st in task_states.items():
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events = (st or {}).get("Events") or []
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if isinstance(events, list):
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for ev in events[-10:]:
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desc = ev.get("DisplayMessage") or ev.get("Message") or ev.get("Type") or ""
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if desc:
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texts.append(desc)
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return " ".join(texts).lower()
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while time.time() - start < timeout:
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allocs = await self.nomad.get_job_allocations(self.config.job_id)
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healthy_count = 0
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for alloc in allocs:
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if alloc.status == AllocationStatus.RUNNING and alloc.http_address:
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if await self.executor.health_check(alloc.http_address):
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healthy_count += 1
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# Fast-fail on obvious driver/image errors to avoid waiting out the full timeout.
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if alloc.id:
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detail = await self.nomad.get_allocation(alloc.id)
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if isinstance(detail, dict):
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|
summary = _summarize_alloc_detail(detail)
|
|
lowered = _alloc_events_lower(detail) or summary.lower()
|
|
if "failed to pull" in lowered or "pull access denied" in lowered:
|
|
raise RuntimeError(
|
|
"Nomad allocation failed to start due to a Docker image pull error. "
|
|
f"Allocation {alloc.id[:8]}: {summary}\n"
|
|
"If you're using a local image tag (e.g. `atropos-sandbox:local`) on macOS, "
|
|
"make sure the image is loaded into Docker, e.g.:\n"
|
|
" docker buildx build --load -t atropos-sandbox:local -f Hermes-Agent/atropos/Dockerfile Hermes-Agent/atropos"
|
|
)
|
|
if "exceeded allowed attempts" in lowered:
|
|
raise RuntimeError(
|
|
"Nomad allocation is crash-looping and has entered restart backoff. "
|
|
f"Allocation {alloc.id[:8]}: {summary}\n"
|
|
"Inspect logs with:\n"
|
|
f" nomad alloc logs -stderr -task sandbox-server {alloc.id}\n"
|
|
"Common causes include: missing local Docker image tag, container entrypoint error, "
|
|
"or sandbox-server startup failure."
|
|
)
|
|
|
|
if healthy_count >= min_count:
|
|
return
|
|
|
|
await asyncio.sleep(2.0)
|
|
|
|
# Timed out: include allocation status detail to help debugging.
|
|
allocs = await self.nomad.get_job_allocations(self.config.job_id)
|
|
alloc_lines: List[str] = []
|
|
for alloc in allocs[:10]:
|
|
addr = alloc.http_address or "-"
|
|
line = f"{alloc.id[:8]} status={alloc.status.value} http={addr}"
|
|
detail = await self.nomad.get_allocation(alloc.id)
|
|
if isinstance(detail, dict):
|
|
summary = _summarize_alloc_detail(detail)
|
|
if summary:
|
|
line += f" detail={summary}"
|
|
alloc_lines.append(line)
|
|
|
|
hint = (
|
|
"Timed out waiting for healthy sandbox allocations.\n"
|
|
f"Job: {self.config.job_id}, desired_healthy: {min_count}\n"
|
|
"Allocations:\n - " + "\n - ".join(alloc_lines)
|
|
)
|
|
raise RuntimeError(hint)
|
|
|
|
async def _try_scale_up(self) -> bool:
|
|
"""Attempt to scale up the job."""
|
|
import time
|
|
|
|
async with self._scale_lock:
|
|
# Check cooldown
|
|
if time.time() - self._last_scale_time < self.config.scale_cooldown:
|
|
return False
|
|
|
|
# Check max containers
|
|
status = await self.nomad.get_job_status(self.config.job_id)
|
|
if status is None:
|
|
return False
|
|
|
|
current_count = status.count
|
|
if current_count >= self.config.max_containers:
|
|
logger.warning(f"Cannot scale up: already at max ({self.config.max_containers})")
|
|
return False
|
|
|
|
# Scale up
|
|
new_count = min(current_count + 1, self.config.max_containers)
|
|
logger.info(f"Scaling up from {current_count} to {new_count} containers")
|
|
|
|
scale_resp = await self.nomad.scale_job(
|
|
self.config.job_id,
|
|
count=new_count,
|
|
task_group="sandbox",
|
|
)
|
|
|
|
# Nomad may return non-JSON errors (e.g. plain text) with a status field.
|
|
if isinstance(scale_resp, dict) and scale_resp.get("status", 200) >= 400:
|
|
logger.warning(f"Scale request rejected: {scale_resp}")
|
|
self._last_scale_time = time.time()
|
|
return False
|
|
|
|
self._last_scale_time = time.time()
|
|
|
|
# Wait for new allocation in the background so contended acquires can still
|
|
# make progress (e.g. by grabbing slots released by other trajectories).
|
|
if self._scale_task is None or self._scale_task.done():
|
|
self._scale_task = asyncio.create_task(self._wait_for_scale(new_count))
|
|
|
|
return True
|
|
|
|
async def _wait_for_scale(self, desired_count: int) -> None:
|
|
try:
|
|
await self._wait_for_healthy_allocations(desired_count, timeout=60.0)
|
|
await self._refresh_slots()
|
|
except asyncio.CancelledError:
|
|
raise
|
|
except Exception as e:
|
|
logger.error(f"Failed to scale up: {e}")
|
|
|
|
async def _health_check_loop(self) -> None:
|
|
"""Background task to monitor container health."""
|
|
while True:
|
|
try:
|
|
await asyncio.sleep(self.config.health_check_interval)
|
|
await self._refresh_slots()
|
|
except asyncio.CancelledError:
|
|
break
|
|
except Exception as e:
|
|
logger.error(f"Health check error: {e}")
|
|
|
|
def get_stats(self) -> Dict[str, Any]:
|
|
"""Get pool statistics."""
|
|
slots_by_state = {}
|
|
for slot in self._slots.values():
|
|
state = slot.state.value
|
|
slots_by_state[state] = slots_by_state.get(state, 0) + 1
|
|
|
|
container_count = len({s.alloc_id for s in self._slots.values()}) if self._slots else 0
|
|
|
|
return {
|
|
"total_slots": self.total_slots,
|
|
"available_slots": self.available_slots,
|
|
"acquired_slots": self.acquired_slots,
|
|
"containers": container_count,
|
|
"slots_by_state": slots_by_state,
|
|
"started": self._started,
|
|
}
|