710 lines
26 KiB
Python
710 lines
26 KiB
Python
"""Direct SSH command and filesystem storage adapters for Vast containers."""
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from __future__ import annotations
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import hashlib
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import json
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import logging
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import os
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import random
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import shlex
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import subprocess
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import time
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import zipfile
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from dataclasses import dataclass, field
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from io import BytesIO
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from pathlib import Path, PurePosixPath
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from typing import BinaryIO, Callable, Sequence
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if __package__:
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from .huggingface_assets import HuggingFaceAssetSource
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else: # pragma: no cover - direct debugging imports.
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from huggingface_assets import HuggingFaceAssetSource
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logger = logging.getLogger(__name__)
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DEFAULT_VAST_SSH_CONNECT_TIMEOUT_SECONDS = 15
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DEFAULT_VAST_SSH_COMMAND_TIMEOUT_SECONDS = 120.0
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DEFAULT_VAST_SSH_RETRY_ATTEMPTS = 4
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DEFAULT_VAST_SSH_RETRY_BASE_DELAY_SECONDS = 0.5
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DEFAULT_VAST_SSH_RETRY_MAX_DELAY_SECONDS = 4.0
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DEFAULT_VAST_STORAGE_ROOT = PurePosixPath("/storage")
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_TRANSIENT_SSH_TRANSPORT_DIAGNOSTICS = (
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"connection closed by",
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"connection reset by",
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"connection refused",
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"connection timed out",
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"kex_exchange_identification:",
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"network is unreachable",
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"no route to host",
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"operation timed out",
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"remote host has disconnected",
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"ssh_exchange_identification:",
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)
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_ATOMIC_STDIN_WRITER = """\
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import os
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import pathlib
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import shutil
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import sys
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import tempfile
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expected_size = int(sys.argv[1])
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target = pathlib.Path(sys.argv[2])
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target.parent.mkdir(parents=True, exist_ok=True)
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fd, name = tempfile.mkstemp(
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prefix=f".{target.name}.",
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suffix=".tmp",
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dir=target.parent,
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)
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try:
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with os.fdopen(fd, "wb", buffering=0) as output:
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shutil.copyfileobj(sys.stdin.buffer, output, length=1048576)
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actual_size = output.tell()
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if actual_size != expected_size:
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raise ValueError(
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f"Incomplete SSH upload: expected {expected_size} bytes, "
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f"received {actual_size}."
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)
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output.flush()
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os.fsync(output.fileno())
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os.chmod(name, 0o600)
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os.replace(name, target)
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except (OSError, ValueError):
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pathlib.Path(name).unlink(missing_ok=True)
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raise
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"""
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class VastSshError(RuntimeError):
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"""Raised when a direct Vast SSH or filesystem operation fails."""
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class VastSshCancelledError(VastSshError):
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"""Raised when the caller cancels an active direct SSH command."""
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@dataclass(frozen=True)
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class VastSshConnection:
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"""Describe one Vast instance SSH endpoint without private credentials."""
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host: str
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port: int
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known_hosts_path: Path
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user: str = "root"
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identity_file: Path | None = None
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def __post_init__(self) -> None:
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"""Validate endpoint and local trust-store paths."""
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if not self.host.strip() or any(
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character in self.host for character in ("\x00", "\n", "\r")
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):
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raise ValueError("Vast SSH host must be a non-empty single-line value.")
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if self.host.startswith("-"):
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raise ValueError("Vast SSH host must not begin with an option prefix.")
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if isinstance(self.port, bool) or not (1 <= self.port <= 65535):
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raise ValueError("Vast SSH port must be between 1 and 65535.")
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if not self.user.strip() or not all(
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character.isalnum() or character in "_.-" for character in self.user
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):
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raise ValueError("Vast SSH user contains unsafe characters.")
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if not self.known_hosts_path.is_absolute():
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raise ValueError("Vast known_hosts_path must be absolute.")
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if self.identity_file is not None and not self.identity_file.is_absolute():
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raise ValueError("Vast SSH identity_file must be absolute when configured.")
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@property
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def target(self) -> str:
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"""Return the OpenSSH user and host destination."""
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return f"{self.user}@{self.host}"
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@dataclass(frozen=True)
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class VastSshCommandResult:
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"""Capture a completed direct SSH command."""
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stdout: bytes
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stderr: bytes
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returncode: int
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@property
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def stdout_text(self) -> str:
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"""Decode standard output as replacement-safe UTF-8."""
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return self.stdout.decode("utf-8", errors="replace")
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@property
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def stderr_text(self) -> str:
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"""Decode standard error as replacement-safe UTF-8."""
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return self.stderr.decode("utf-8", errors="replace")
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def _is_transient_ssh_transport_failure(result: VastSshCommandResult) -> bool:
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"""Return whether OpenSSH reports a retryable connection-level failure."""
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if result.returncode != 255:
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return False
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diagnostic = f"{result.stderr_text}\n{result.stdout_text}".casefold()
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return any(
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marker in diagnostic for marker in _TRANSIENT_SSH_TRANSPORT_DIAGNOSTICS
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)
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def _resolved_input_file(
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input_payload: bytes | None,
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input_file: Path | None,
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) -> Path | None:
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"""Validate mutually exclusive SSH input sources and resolve a file source."""
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if input_payload is not None and input_file is not None:
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raise ValueError("Vast SSH input_payload and input_file are mutually exclusive.")
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resolved = input_file.expanduser().resolve() if input_file is not None else None
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if resolved is not None and not resolved.is_file():
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raise FileNotFoundError(f"Vast SSH input file not found: {resolved}")
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return resolved
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@dataclass
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class VastSshRunner:
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"""Run argv-safe commands inside one Vast instance container."""
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connection: VastSshConnection
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connect_timeout_seconds: int = DEFAULT_VAST_SSH_CONNECT_TIMEOUT_SECONDS
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command_timeout_seconds: float = DEFAULT_VAST_SSH_COMMAND_TIMEOUT_SECONDS
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retry_attempts: int = DEFAULT_VAST_SSH_RETRY_ATTEMPTS
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retry_base_delay_seconds: float = DEFAULT_VAST_SSH_RETRY_BASE_DELAY_SECONDS
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retry_max_delay_seconds: float = DEFAULT_VAST_SSH_RETRY_MAX_DELAY_SECONDS
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ssh_binary: str = "ssh"
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sleep: Callable[[float], None] = field(default=time.sleep, repr=False)
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random_unit: Callable[[], float] = field(default=random.random, repr=False)
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def __post_init__(self) -> None:
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"""Create the dedicated trust store without weakening global SSH policy."""
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if self.connect_timeout_seconds <= 0 or self.command_timeout_seconds <= 0:
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raise ValueError("Vast SSH timeouts must be positive.")
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if isinstance(self.retry_attempts, bool) or self.retry_attempts <= 0:
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raise ValueError("Vast SSH retry attempts must be positive.")
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if (
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self.retry_base_delay_seconds <= 0
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or self.retry_max_delay_seconds < self.retry_base_delay_seconds
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):
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raise ValueError("Vast SSH retry delays must be positive and ordered.")
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try:
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self.connection.known_hosts_path.parent.mkdir(parents=True, exist_ok=True)
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self.connection.known_hosts_path.touch(mode=0o600, exist_ok=True)
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os.chmod(self.connection.known_hosts_path, 0o600)
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except OSError as exc:
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raise VastSshError(
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f"Unable to initialize Vast SSH trust store at "
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f"{self.connection.known_hosts_path}."
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) from exc
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def command(self, remote_argv: Sequence[str]) -> list[str]:
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"""Return the local OpenSSH argv for one remote argv sequence."""
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if not remote_argv:
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raise ValueError("remote_argv must contain at least one command value.")
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normalized_argv = [str(value) for value in remote_argv]
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if any("\x00" in value for value in normalized_argv):
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raise ValueError("remote_argv must not contain null bytes.")
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command = [
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self.ssh_binary,
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"-p",
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str(self.connection.port),
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"-o",
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"BatchMode=yes",
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"-o",
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"StrictHostKeyChecking=accept-new",
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"-o",
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f"UserKnownHostsFile={self.connection.known_hosts_path}",
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"-o",
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"ClearAllForwardings=yes",
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"-o",
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f"ConnectTimeout={self.connect_timeout_seconds}",
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]
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if self.connection.identity_file is not None:
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command.extend(("-i", str(self.connection.identity_file)))
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command.extend(("--", self.connection.target, shlex.join(normalized_argv)))
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return command
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def run(
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self,
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remote_argv: Sequence[str],
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*,
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input_payload: bytes | None = None,
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input_file: Path | None = None,
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timeout_seconds: float | None = None,
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check: bool = True,
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cancellation_check: Callable[[], bool] | None = None,
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) -> VastSshCommandResult:
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"""Execute one command with bounded transient transport retries."""
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resolved_input_file = _resolved_input_file(input_payload, input_file)
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started_at = time.monotonic()
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for attempt in range(1, self.retry_attempts + 1):
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result = self._run_attempt(
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remote_argv,
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input_payload=input_payload,
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input_file=resolved_input_file,
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timeout_seconds=timeout_seconds,
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cancellation_check=cancellation_check,
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)
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if _is_transient_ssh_transport_failure(result):
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if attempt >= self.retry_attempts:
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raise self._command_error(
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remote_argv,
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result,
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suffix=f" after {attempt} transport attempts",
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)
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delay_seconds = self._retry_delay_seconds(attempt)
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logger.warning(
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"Retrying transient Vast SSH transport failure host=%s "
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"command=%s attempt=%d/%d delay_seconds=%.2f diagnostic=%s",
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self.connection.host,
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remote_argv[0],
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attempt,
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self.retry_attempts,
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delay_seconds,
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result.stderr_text.strip() or result.stdout_text.strip(),
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)
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self.sleep(delay_seconds)
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if cancellation_check is not None and cancellation_check():
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raise VastSshCancelledError("Vast SSH command was cancelled.")
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continue
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logger.debug(
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"Finished Vast SSH command host=%s command=%s returncode=%d "
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"attempts=%d elapsed_seconds=%.3f.",
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self.connection.host,
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remote_argv[0],
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result.returncode,
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attempt,
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time.monotonic() - started_at,
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)
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if check and result.returncode != 0:
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raise self._command_error(remote_argv, result)
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return result
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raise RuntimeError("Vast SSH retry loop ended without a result.")
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def _run_attempt(
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self,
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remote_argv: Sequence[str],
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*,
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input_payload: bytes | None,
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input_file: Path | None,
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timeout_seconds: float | None,
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cancellation_check: Callable[[], bool] | None,
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) -> VastSshCommandResult:
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"""Execute one OpenSSH subprocess attempt, reopening streamed input files."""
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try:
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if input_file is None:
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completed = self._run_subprocess(
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remote_argv,
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input_payload=input_payload,
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input_handle=None,
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timeout_seconds=timeout_seconds,
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cancellation_check=cancellation_check,
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)
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else:
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with input_file.open("rb") as input_handle:
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completed = self._run_subprocess(
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remote_argv,
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input_payload=None,
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input_handle=input_handle,
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timeout_seconds=timeout_seconds,
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cancellation_check=cancellation_check,
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)
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except FileNotFoundError as exc:
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raise VastSshError(
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f"The SSH client {self.ssh_binary!r} is not installed."
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) from exc
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except subprocess.TimeoutExpired as exc:
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raise VastSshError(
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f"SSH command to Vast instance {self.connection.host!r} timed out "
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f"after {exc.timeout} seconds."
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) from exc
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return VastSshCommandResult(
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stdout=completed.stdout,
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stderr=completed.stderr,
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returncode=completed.returncode,
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)
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def _retry_delay_seconds(self, failed_attempt: int) -> float:
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"""Return exponential retry delay with bounded per-attempt jitter."""
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base_delay = min(
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self.retry_max_delay_seconds,
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self.retry_base_delay_seconds * (2 ** (failed_attempt - 1)),
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)
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jitter_unit = min(1.0, max(0.0, float(self.random_unit())))
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return base_delay * (0.75 + (0.5 * jitter_unit))
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@staticmethod
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def _command_error(
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remote_argv: Sequence[str],
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result: VastSshCommandResult,
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*,
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suffix: str = "",
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) -> VastSshError:
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"""Build one bounded, actionable SSH command failure."""
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detail = result.stderr_text.strip() or result.stdout_text.strip()
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return VastSshError(
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f"Vast SSH command {remote_argv[0]!r} failed with exit status "
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f"{result.returncode}{suffix}: {detail or 'no diagnostic output'}"
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)
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def _run_subprocess(
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self,
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remote_argv: Sequence[str],
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*,
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input_payload: bytes | None,
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input_handle: BinaryIO | None,
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timeout_seconds: float | None,
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cancellation_check: Callable[[], bool] | None,
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) -> subprocess.CompletedProcess[bytes]:
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"""Run OpenSSH with either a small byte payload or a streamed file handle."""
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timeout = (
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self.command_timeout_seconds
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if timeout_seconds is None
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else timeout_seconds
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)
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if cancellation_check is not None:
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return self._run_cancellable_subprocess(
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remote_argv,
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input_payload=input_payload,
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input_handle=input_handle,
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timeout_seconds=timeout,
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cancellation_check=cancellation_check,
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)
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if input_handle is not None:
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return subprocess.run(
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self.command(remote_argv),
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stdin=input_handle,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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check=False,
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timeout=timeout,
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)
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return subprocess.run(
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self.command(remote_argv),
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input=input_payload,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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check=False,
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timeout=timeout,
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)
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def _run_cancellable_subprocess(
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self,
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remote_argv: Sequence[str],
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*,
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input_payload: bytes | None,
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input_handle: BinaryIO | None,
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timeout_seconds: float,
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cancellation_check: Callable[[], bool],
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) -> subprocess.CompletedProcess[bytes]:
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"""Run OpenSSH while promptly terminating it when cancellation is requested."""
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if cancellation_check():
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raise VastSshCancelledError("Vast SSH command was cancelled.")
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process = subprocess.Popen(
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self.command(remote_argv),
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stdin=input_handle if input_handle is not None else subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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started_at = time.monotonic()
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payload = input_payload
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while True:
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if cancellation_check():
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process.terminate()
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try:
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process.wait(timeout=5.0)
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except subprocess.TimeoutExpired:
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process.kill()
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process.wait()
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raise VastSshCancelledError("Vast SSH command was cancelled.")
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remaining = timeout_seconds - (time.monotonic() - started_at)
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if remaining <= 0:
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process.kill()
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stdout, stderr = process.communicate()
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raise subprocess.TimeoutExpired(
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self.command(remote_argv),
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timeout_seconds,
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output=stdout,
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stderr=stderr,
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)
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try:
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stdout, stderr = process.communicate(
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input=payload,
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timeout=min(0.25, remaining),
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)
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return subprocess.CompletedProcess(
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args=self.command(remote_argv),
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returncode=process.returncode,
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stdout=stdout,
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stderr=stderr,
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)
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except subprocess.TimeoutExpired:
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payload = None
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def popen(self, remote_argv: Sequence[str]) -> subprocess.Popen[bytes]:
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"""Start one streaming direct SSH command."""
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try:
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return subprocess.Popen(
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self.command(remote_argv),
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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except FileNotFoundError as exc:
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raise VastSshError(
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f"The SSH client {self.ssh_binary!r} is not installed."
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) from exc
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|
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@dataclass
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class VastSshVolumeBackend:
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"""Store content-addressed files directly on a Vast instance filesystem."""
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remote_volume_epoch_scoped = True
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runner: VastSshRunner
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storage_root: PurePosixPath = DEFAULT_VAST_STORAGE_ROOT
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_exists_cache: dict[str, bool] = field(default_factory=dict)
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_materializer_path: PurePosixPath | None = field(init=False, default=None)
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def __post_init__(self) -> None:
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"""Require an absolute non-root storage location."""
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if not self.storage_root.is_absolute() or self.storage_root == PurePosixPath("/"):
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raise ValueError("Vast storage_root must be an absolute non-root path.")
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self.runner.run(("mkdir", "-p", str(self.storage_root)))
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def exists(self, remote_path: str) -> bool:
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"""Return whether one regular file exists under the storage root."""
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normalized = _validated_storage_path(remote_path)
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cached = self._exists_cache.get(normalized)
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if cached is not None:
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return cached
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result = self.runner.run(
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("test", "-f", str(self.storage_root / normalized)),
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check=False,
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)
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exists = result.returncode == 0
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self._exists_cache[normalized] = exists
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return exists
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def put_file(self, local_path: Path, remote_path: str) -> None:
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"""Stream one local file through SSH and atomically publish it remotely."""
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resolved_path = local_path.expanduser().resolve()
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if not resolved_path.is_file():
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raise FileNotFoundError(f"Asset not found: {resolved_path}")
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size_bytes = resolved_path.stat().st_size
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normalized = _validated_storage_path(remote_path)
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target = str(self.storage_root / normalized)
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self.runner.run(
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(
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"python",
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"-c",
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|
_ATOMIC_STDIN_WRITER,
|
|
str(size_bytes),
|
|
target,
|
|
),
|
|
input_file=resolved_path,
|
|
timeout_seconds=max(60.0, size_bytes / (4 * 1024 * 1024)),
|
|
)
|
|
self._exists_cache[normalized] = True
|
|
|
|
def put_file_cancellable(
|
|
self,
|
|
local_path: Path,
|
|
remote_path: str,
|
|
*,
|
|
cancellation_check: Callable[[], bool],
|
|
) -> None:
|
|
"""Stream one file while terminating OpenSSH promptly on cancellation."""
|
|
resolved_path = local_path.expanduser().resolve()
|
|
if not resolved_path.is_file():
|
|
raise FileNotFoundError(f"Asset not found: {resolved_path}")
|
|
size_bytes = resolved_path.stat().st_size
|
|
normalized = _validated_storage_path(remote_path)
|
|
try:
|
|
self.runner.run(
|
|
(
|
|
"python",
|
|
"-c",
|
|
_ATOMIC_STDIN_WRITER,
|
|
str(size_bytes),
|
|
str(self.storage_root / normalized),
|
|
),
|
|
input_file=resolved_path,
|
|
timeout_seconds=max(60.0, size_bytes / (4 * 1024 * 1024)),
|
|
cancellation_check=cancellation_check,
|
|
)
|
|
except VastSshCancelledError as exc:
|
|
raise InterruptedError("Vast file upload was cancelled.") from exc
|
|
self._exists_cache[normalized] = True
|
|
|
|
def put_bytes(self, payload: bytes, remote_path: str) -> None:
|
|
"""Atomically upload bytes under the storage root."""
|
|
self._put_payload(payload, remote_path)
|
|
|
|
def _put_payload(self, payload: bytes, remote_path: str) -> None:
|
|
"""Stream bytes to an argv-safe remote Python atomic writer."""
|
|
normalized = _validated_storage_path(remote_path)
|
|
target = str(self.storage_root / normalized)
|
|
self.runner.run(
|
|
("python", "-c", _ATOMIC_STDIN_WRITER, str(len(payload)), target),
|
|
input_payload=payload,
|
|
timeout_seconds=max(60.0, len(payload) / (4 * 1024 * 1024)),
|
|
)
|
|
self._exists_cache[normalized] = True
|
|
|
|
def materialize_huggingface_file(
|
|
self,
|
|
source: HuggingFaceAssetSource,
|
|
remote_path: str,
|
|
*,
|
|
token: str | None,
|
|
) -> bool:
|
|
"""Ask the Vast worker to fetch and verify one immutable Hugging Face file."""
|
|
return self.materialize_huggingface_file_cancellable(
|
|
source,
|
|
remote_path,
|
|
token=token,
|
|
cancellation_check=lambda: False,
|
|
)
|
|
|
|
def materialize_huggingface_file_cancellable(
|
|
self,
|
|
source: HuggingFaceAssetSource,
|
|
remote_path: str,
|
|
*,
|
|
token: str | None,
|
|
cancellation_check: Callable[[], bool],
|
|
) -> bool:
|
|
"""Run the current materializer bundle and allow prompt cancellation."""
|
|
normalized = _validated_storage_path(remote_path)
|
|
request_payload = json.dumps(
|
|
{
|
|
"remote_path": normalized,
|
|
"source": source.to_dict(),
|
|
"storage_root": str(self.storage_root),
|
|
"token": token,
|
|
},
|
|
sort_keys=True,
|
|
).encode("utf-8")
|
|
timeout_seconds = max(900.0, source.size_bytes / (2 * 1024 * 1024))
|
|
try:
|
|
materializer_path = self._ensure_materializer_bundle(
|
|
cancellation_check=cancellation_check,
|
|
)
|
|
self.runner.run(
|
|
("python", str(materializer_path)),
|
|
input_payload=request_payload,
|
|
timeout_seconds=timeout_seconds,
|
|
cancellation_check=cancellation_check,
|
|
)
|
|
except VastSshCancelledError as exc:
|
|
raise InterruptedError("Vast Hugging Face download was cancelled.") from exc
|
|
except VastSshError as exc:
|
|
logger.warning(
|
|
"Vast Hugging Face materialization failed for %s; falling back to SSH upload: %s",
|
|
source.display_reference,
|
|
exc,
|
|
)
|
|
return False
|
|
self._exists_cache[normalized] = True
|
|
return True
|
|
|
|
def _ensure_materializer_bundle(
|
|
self,
|
|
*,
|
|
cancellation_check: Callable[[], bool],
|
|
) -> PurePosixPath:
|
|
"""Upload a tiny current-source zipapp independent of the worker image version."""
|
|
if self._materializer_path is not None:
|
|
return self._materializer_path
|
|
payload = _huggingface_materializer_bundle()
|
|
digest = hashlib.sha256(payload).hexdigest()
|
|
relative_path = f"runtime-tools/huggingface-materializer-{digest}.pyz"
|
|
normalized = _validated_storage_path(relative_path)
|
|
target = self.storage_root / normalized
|
|
if not self.exists(normalized):
|
|
self.runner.run(
|
|
(
|
|
"python",
|
|
"-c",
|
|
_ATOMIC_STDIN_WRITER,
|
|
str(len(payload)),
|
|
str(target),
|
|
),
|
|
input_payload=payload,
|
|
timeout_seconds=60.0,
|
|
cancellation_check=cancellation_check,
|
|
)
|
|
self._exists_cache[normalized] = True
|
|
self._materializer_path = target
|
|
return target
|
|
|
|
|
|
def _huggingface_materializer_bundle() -> bytes:
|
|
"""Build an executable zip containing the current verified-download implementation."""
|
|
repo_root = Path(__file__).resolve().parent
|
|
members = {
|
|
"__main__.py": (
|
|
b"from remote.huggingface_materializer import main\n"
|
|
b"raise SystemExit(main())\n"
|
|
),
|
|
"remote/__init__.py": b"",
|
|
"remote/huggingface_materializer.py": (
|
|
repo_root / "remote" / "huggingface_materializer.py"
|
|
).read_bytes(),
|
|
"huggingface_assets.py": (repo_root / "huggingface_assets.py").read_bytes(),
|
|
}
|
|
output = BytesIO()
|
|
with zipfile.ZipFile(output, "w", compression=zipfile.ZIP_DEFLATED) as archive:
|
|
for member_name, member_payload in members.items():
|
|
member = zipfile.ZipInfo(member_name, date_time=(1980, 1, 1, 0, 0, 0))
|
|
member.compress_type = zipfile.ZIP_DEFLATED
|
|
member.external_attr = 0o644 << 16
|
|
archive.writestr(member, member_payload)
|
|
return output.getvalue()
|
|
|
|
|
|
def vast_connection_from_lease(
|
|
*,
|
|
ssh_host: str | None,
|
|
ssh_port: int | None,
|
|
user_directory: Path,
|
|
identity_file: Path | None = None,
|
|
) -> VastSshConnection:
|
|
"""Build one direct connection from a ready lease's safe public fields."""
|
|
if not ssh_host or ssh_port is None:
|
|
raise VastSshError("Vast lease does not expose an SSH endpoint.")
|
|
return VastSshConnection(
|
|
host=ssh_host,
|
|
port=ssh_port,
|
|
known_hosts_path=(
|
|
user_directory.expanduser().resolve()
|
|
/ "comfyui-modal"
|
|
/ "vast-known-hosts"
|
|
),
|
|
identity_file=(identity_file.expanduser().resolve() if identity_file else None),
|
|
)
|
|
|
|
|
|
def _validated_storage_path(remote_path: str) -> str:
|
|
"""Return one traversal-safe path relative to Vast storage."""
|
|
path = PurePosixPath(str(remote_path).lstrip("/"))
|
|
if (
|
|
not path.parts
|
|
or any(part in {"", ".", ".."} for part in path.parts)
|
|
or "\x00" in str(path)
|
|
):
|
|
raise ValueError(f"Unsafe Vast storage path {remote_path!r}.")
|
|
return path.as_posix()
|
|
|
|
|
|
__all__ = [
|
|
"DEFAULT_VAST_STORAGE_ROOT",
|
|
"VastSshCommandResult",
|
|
"VastSshCancelledError",
|
|
"VastSshConnection",
|
|
"VastSshError",
|
|
"VastSshRunner",
|
|
"VastSshVolumeBackend",
|
|
"vast_connection_from_lease",
|
|
]
|