bvandeusenandClaude Opus 5.5
d2ade9c1c7
- Output is read in 64 KiB chunks and split into lines here; a line past 64 KiB is cut and marked instead of raising out of readline's limit. - ansible-playbook runs in its own session; whatever ends the read (finish, an error, the task being cancelled) SIGTERMs then SIGKILLs its whole group, so no ssh or worker it forked outlives the run. - A run whose task is cancelled (shutdown) records 'cancelled' with finished_at before re-raising, instead of staying 'running'. - A cancel that lands after the process exited 0 no longer turns a successful run into 'cancelled'. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
606 lines
24 KiB
Python
606 lines
24 KiB
Python
# steward/ansible/executor.py
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from __future__ import annotations
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import asyncio
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import json
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import logging
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import os
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import re
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import shutil
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import signal
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import tempfile
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import time
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from dataclasses import dataclass
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from datetime import datetime, timezone
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from pathlib import Path
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from typing import TYPE_CHECKING
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from steward.core.crypto import is_encrypted as _crypto_is_encrypted
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if TYPE_CHECKING:
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from quart import Quart
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logger = logging.getLogger(__name__)
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_OUTPUT_CAP_BYTES = 1024 * 1024 # 1 MB DB cap (full output also goes to a log artifact)
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_FLUSH_LINES = 50
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_FLUSH_SECS = 5.0
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_MEM_LINES_CAP = 5000 # bounded per-run in-memory replay buffer (SSE late-joiners)
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_MEM_TTL_SECS = 300 # drop in-memory state this long after a run completes
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_FAILURE_CAP = 50 # max failed-task lines captured into structured results
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_READ_CHUNK = 65536 # output is read in chunks, never a whole line at once (#5156)
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_MAX_LINE_BYTES = 65536 # a longer line is cut here and marked, not allowed to stall
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# Full run logs persist here (survive restart + the 1 MB DB cap). Override via env.
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ARTIFACT_DIR = os.environ.get("STEWARD_ANSIBLE_LOG_DIR", "/data/ansible/runs")
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def artifact_path(run_id: str) -> str:
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return os.path.join(ARTIFACT_DIR, f"{run_id}.log")
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@dataclass
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class _Done:
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status: str
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class _Aborted(Exception):
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"""Raised internally when a queued run is cancelled before it launches."""
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# Per-run broadcast state (lives until shortly after completion, then GC'd)
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_run_lines: dict[str, list[str]] = {} # bounded tail of output lines
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_run_done: dict[str, _Done] = {} # set when run completes
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_run_listeners: dict[str, list[asyncio.Queue]] = {} # active SSE client queues
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# Running subprocesses by run_id (for cancellation) + run_ids an operator cancelled.
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_run_procs: dict[str, asyncio.subprocess.Process] = {}
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_cancelled: set[str] = set()
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def register_listener(run_id: str) -> asyncio.Queue:
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"""Create a listener queue for a run. Replays existing lines immediately."""
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q: asyncio.Queue = asyncio.Queue()
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for line in _run_lines.get(run_id, []):
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q.put_nowait(line)
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done = _run_done.get(run_id)
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if done:
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q.put_nowait(done)
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else:
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_run_listeners.setdefault(run_id, []).append(q)
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return q
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def deregister_listener(run_id: str, q: asyncio.Queue) -> None:
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listeners = _run_listeners.get(run_id, [])
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if q in listeners:
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listeners.remove(q)
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def _schedule_cleanup(run_id: str) -> None:
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"""Drop a finished run's in-memory state after a grace window."""
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async def _cleanup() -> None:
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await asyncio.sleep(_MEM_TTL_SECS)
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_run_lines.pop(run_id, None)
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_run_done.pop(run_id, None)
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try:
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asyncio.create_task(_cleanup())
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except RuntimeError:
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pass # no running loop (e.g. tests) — fine to skip
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def _broadcast(run_id: str, item: str | _Done) -> None:
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if isinstance(item, str):
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buf = _run_lines.setdefault(run_id, [])
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buf.append(item)
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if len(buf) > _MEM_LINES_CAP: # keep only the most recent lines in memory
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del buf[: len(buf) - _MEM_LINES_CAP]
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else:
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_run_done[run_id] = item
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for q in _run_listeners.get(run_id, []):
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q.put_nowait(item)
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if isinstance(item, _Done):
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_run_listeners.pop(run_id, None)
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_schedule_cleanup(run_id)
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def build_ansible_command(
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playbook_path: str,
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inventory_path: str,
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params: dict | None = None,
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) -> list[str]:
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"""Build the ansible-playbook argv from a run's optional params.
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Pure (no IO). Everything is passed as argv — never shell-interpolated — so
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extra-var values and limits can contain arbitrary characters safely.
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params keys: extra_vars (list of "key=value"), limit, tags, check (bool).
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"""
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cmd = ["ansible-playbook", playbook_path, "-i", inventory_path]
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params = params or {}
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for ev in params.get("extra_vars") or []:
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cmd += ["-e", ev]
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if params.get("limit"):
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cmd += ["--limit", params["limit"]]
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if params.get("tags"):
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cmd += ["--tags", params["tags"]]
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if params.get("check"):
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cmd += ["--check", "--diff"]
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return cmd
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def build_credentials(creds: dict | None, tmpdir: str) -> tuple[list[str], list[tuple[str, str]]]:
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"""Given global Ansible creds + a temp dir, return (extra argv, files to write).
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Pure: decides flags + file contents; the caller writes the files (mode 0600).
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Secrets are always passed via files — never on argv / the process list.
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creds keys: ssh_private_key, vault_password, become_password.
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"""
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args: list[str] = []
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files: list[tuple[str, str]] = []
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creds = creds or {}
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from steward.core.crypto import is_encrypted
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key = creds.get("ssh_private_key")
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# A still-encrypted value means decryption failed (app secret key changed) —
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# writing the ciphertext as a key file just yields a cryptic libcrypto error,
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# so skip it; start_run surfaces a clear message instead.
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if key and not is_encrypted(key):
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path = os.path.join(tmpdir, "id_key")
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files.append((path, key if key.endswith("\n") else key + "\n"))
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args += ["--private-key", path]
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vault = creds.get("vault_password")
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if vault:
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path = os.path.join(tmpdir, "vault_pass")
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files.append((path, vault + "\n"))
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args += ["--vault-password-file", path]
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become = creds.get("become_password")
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if become:
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path = os.path.join(tmpdir, "become.yml")
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# A JSON string is valid YAML; keeps the password out of argv.
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files.append((path, "ansible_become_password: " + json.dumps(become) + "\n"))
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args += ["-e", "@" + path]
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return args, files
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def build_bootstrap(connection: dict | None, tmpdir: str) -> tuple[list[str], list[tuple[str, str]]]:
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"""Per-run connection override for first-contact provisioning.
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Pure: returns (extra argv, files to write). The bootstrap user/password are
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written to a temp vars file (``-e @file``) — never argv, never the DB — so
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they don't leak via the process list or persist on the AnsibleRun row.
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A bare connection password doubles as the become password unless one is
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given explicitly. connection keys: user, password, become_password.
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"""
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args: list[str] = []
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files: list[tuple[str, str]] = []
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connection = connection or {}
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user = (connection.get("user") or "").strip()
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password = connection.get("password") or ""
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if not user and not password:
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return args, files
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lines: dict[str, str] = {}
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if user:
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lines["ansible_user"] = user
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if password:
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lines["ansible_password"] = password
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lines["ansible_become_password"] = connection.get("become_password") or password
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# JSON values are valid YAML and keep arbitrary characters safe.
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content = "".join(f"{k}: {json.dumps(v)}\n" for k, v in lines.items())
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path = os.path.join(tmpdir, "bootstrap.yml")
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files.append((path, content))
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args += ["-e", "@" + path]
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return args, files
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def build_extra_vars_file(merged: dict | None, tmpdir: str) -> tuple[list[str], list[tuple[str, str]]]:
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"""Run-time variables → a JSON extra-vars file (``-e @file``).
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Pure: returns (argv, files). JSON is valid YAML to Ansible and, unlike
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``-e key=value`` strings (which Ansible shlex-splits on whitespace), keeps
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values with spaces/quotes intact. Used for both operator-entered playbook
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variables and the unpersisted secret subset (merged by the caller).
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"""
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if not merged:
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return [], []
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path = os.path.join(tmpdir, "extravars.json")
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return ["-e", "@" + path], [(path, json.dumps(merged))]
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def ansible_env(creds: dict | None, base_env) -> dict:
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"""Return a copy of base_env with ANSIBLE_HOST_KEY_CHECKING set from creds."""
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env = dict(base_env)
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env["ANSIBLE_HOST_KEY_CHECKING"] = "True" if (creds or {}).get("host_key_checking") else "False"
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return env
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# ── Structured results (parsed from the streamed output) ──────────────────────
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_RECAP_RE = re.compile(
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r"^(?P<host>\S+)\s*:\s*ok=(?P<ok>\d+)\s+changed=(?P<changed>\d+)\s+"
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r"unreachable=(?P<unreachable>\d+)\s+failed=(?P<failed>\d+)"
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r"(?:\s+skipped=(?P<skipped>\d+))?"
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)
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def parse_recap(lines: list[str]) -> dict[str, dict[str, int]]:
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"""Parse Ansible's PLAY RECAP into {host: {ok,changed,unreachable,failed,skipped}}.
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Streaming-friendly: we keep the default stdout callback (live output) and
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derive the per-host summary from the recap rather than swapping to the json
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callback (which would buffer everything to the end and kill live streaming).
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"""
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hosts: dict[str, dict[str, int]] = {}
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in_recap = False
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for line in lines:
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if "PLAY RECAP" in line:
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in_recap = True
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continue
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if not in_recap:
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continue
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m = _RECAP_RE.match(line.strip())
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if m:
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hosts[m.group("host")] = {
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"ok": int(m.group("ok")),
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"changed": int(m.group("changed")),
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"unreachable": int(m.group("unreachable")),
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"failed": int(m.group("failed")),
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"skipped": int(m.group("skipped") or 0),
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}
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return hosts
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# ── Cancellation ──────────────────────────────────────────────────────────────
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async def _set_status(app: "Quart", run_id: str, status) -> None:
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from sqlalchemy import update
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from steward.models.ansible import AnsibleRun
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async with app.db_sessionmaker() as session:
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async with session.begin():
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await session.execute(
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update(AnsibleRun).where(AnsibleRun.id == run_id).values(status=status)
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)
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def _signal_group(proc: asyncio.subprocess.Process, sig: int) -> None:
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"""Send sig to the run's whole process group (ansible-playbook and the
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ssh and worker processes it forks), or to the process alone when it has
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no group of its own."""
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try:
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os.killpg(proc.pid, sig)
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except ProcessLookupError:
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pass
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except OSError:
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try:
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proc.send_signal(sig)
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except ProcessLookupError:
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pass
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async def _terminate_then_kill(proc: asyncio.subprocess.Process, grace: float = 10.0) -> None:
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"""SIGTERM the run's process group, then SIGKILL it if it outlives grace.
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The group is killed even once the leader has exited, so no worker it
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forked is left behind (#5156)."""
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if proc.returncode is None:
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_signal_group(proc, signal.SIGTERM)
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try:
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await asyncio.wait_for(proc.wait(), timeout=grace)
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except asyncio.TimeoutError:
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pass
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_signal_group(proc, signal.SIGKILL)
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async def _lines(stream: asyncio.StreamReader):
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"""The stream's lines, read in chunks so no line length can stall or break
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the reader: a line past _MAX_LINE_BYTES is cut there and marked, and the
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rest of it is dropped up to its newline (#5156)."""
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pending = b""
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skipping = False
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while True:
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chunk = await stream.read(_READ_CHUNK)
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if not chunk:
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break
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pending += chunk
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while True:
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nl = pending.find(b"\n")
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if nl < 0:
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break
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line, pending = pending[:nl], pending[nl + 1:]
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if skipping:
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skipping = False
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continue
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yield line
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if len(pending) > _MAX_LINE_BYTES and not skipping:
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yield pending[:_MAX_LINE_BYTES] + b" [line cut at %d bytes]" % _MAX_LINE_BYTES
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pending, skipping = b"", True
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elif skipping:
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pending = b""
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if pending and not skipping:
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yield pending
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def cancel_run(run_id: str) -> bool:
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"""Request cancellation of a run. Terminates the process if it's running;
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a queued run is flagged so start_run aborts before launch. Returns False
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only when the run isn't tracked in this process (already finished)."""
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if run_id not in _run_procs and run_id not in _cancelled:
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# Not obviously in-flight. Still flag it (covers a just-queued run whose
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# proc hasn't been registered yet); caller should gate on run status.
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_cancelled.add(run_id)
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return run_id in _run_procs or True
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_cancelled.add(run_id)
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proc = _run_procs.get(run_id)
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if proc is not None:
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asyncio.create_task(_terminate_then_kill(proc))
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return True
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# ── Run execution ─────────────────────────────────────────────────────────────
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# ── Secret scrubbing ──────────────────────────────────────────────────────────
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# Ansible echoes values back: a failed task prints its args, -v prints vars,
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# --diff prints templated files. Each line is masked before it is broadcast,
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# written to the log artifact or stored on the run, so a secret the run was
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# handed never leaves it.
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MASK = "***"
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_MIN_SECRET_LEN = 4 # masking "on" or "1" would mangle the output and hide nothing
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def _strings(value) -> list[str]:
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if isinstance(value, str):
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return [value]
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if isinstance(value, dict):
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return [s for v in value.values() for s in _strings(v)]
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if isinstance(value, (list, tuple, set)):
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return [s for v in value for s in _strings(v)]
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return []
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def run_secrets(creds: dict | None, connection: dict | None,
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secret_vars: dict | None, redact: list[str] | None) -> list[str]:
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"""Every secret value this run is handed: the global become/vault
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passwords, the bootstrap passwords, the sensitive run variables and any
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the caller names (a per-host agent token)."""
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creds, connection = creds or {}, connection or {}
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values = [creds.get("become_password"), creds.get("vault_password"),
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connection.get("password"), connection.get("become_password"),
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*_strings(secret_vars), *(redact or [])]
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found = {v for v in values if isinstance(v, str) and len(v) >= _MIN_SECRET_LEN}
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return sorted(found, key=len, reverse=True) # longest first: no partial masks
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def scrub(line: str, secrets: list[str]) -> str:
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for value in secrets:
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if value in line:
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line = line.replace(value, MASK)
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return line
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async def start_run(
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app: "Quart",
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run_id: str,
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playbook_path: str,
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inventory_path: str,
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source_path: str,
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params: dict | None = None,
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inventory_content: str | None = None,
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connection: dict | None = None,
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secret_vars: dict | None = None,
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redact: list[str] | None = None,
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) -> None:
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"""Execute ansible-playbook as a subprocess and update the DB run row.
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Respects a global concurrency cap (app._ansible_semaphore): if no slot is
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free the run shows as 'queued' until one frees. Supports cancellation, a
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persistent full-log artifact, and a parsed per-host result summary.
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connection is an optional per-run SSH override (user/password) for
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first-contact provisioning. It is applied to the subprocess only — it is
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never persisted on the AnsibleRun row, never placed on argv, and not logged.
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secret_vars are run-time playbook variables flagged sensitive; like
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connection they reach the subprocess (merged into the extra-vars file) but
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are never persisted. Every value in run_secrets() — redact names more — is
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masked in each output line before it goes anywhere.
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"""
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from steward.models.ansible import AnsibleRunStatus
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secrets = run_secrets(app.config.get("ANSIBLE", {}), connection, secret_vars, redact)
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_run_lines[run_id] = []
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db_output = ""
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truncated = False
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lines_since_flush = 0
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last_flush_at = time.monotonic()
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failures: list[str] = []
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async def _flush(final_status: str | None = None, results: dict | None = None) -> None:
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nonlocal lines_since_flush, last_flush_at
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from sqlalchemy import update
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from steward.models.ansible import AnsibleRun
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values: dict = {"output": db_output}
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if results is not None:
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values["results"] = results
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if final_status is not None:
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values["status"] = AnsibleRunStatus(final_status)
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values["finished_at"] = datetime.now(timezone.utc)
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async with app.db_sessionmaker() as session:
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async with session.begin():
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await session.execute(
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update(AnsibleRun).where(AnsibleRun.id == run_id).values(**values)
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)
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lines_since_flush = 0
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last_flush_at = time.monotonic()
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# ── Concurrency gate (semaphore lazily bound to the running loop so the
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# cap is honoured in prod's single loop without breaking multi-loop tests).
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loop = asyncio.get_running_loop()
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sem = getattr(app, "_ansible_semaphore", None)
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if sem is None or getattr(app, "_ansible_sem_loop", None) is not loop:
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cap = int((app.config.get("ANSIBLE") or {}).get("max_concurrent_runs", 3) or 3)
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sem = asyncio.Semaphore(max(1, cap))
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app._ansible_semaphore = sem
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app._ansible_sem_loop = loop
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queued = sem.locked()
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if queued:
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await _set_status(app, run_id, AnsibleRunStatus.queued)
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_broadcast(run_id, "[queued — waiting for an Ansible run slot]")
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await sem.acquire()
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final_status = "failed"
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logf = None
|
|
proc = None
|
|
interrupted = False
|
|
try:
|
|
if run_id in _cancelled: # cancelled while queued — abort before launching
|
|
raise _Aborted
|
|
if queued:
|
|
await _set_status(app, run_id, AnsibleRunStatus.running)
|
|
|
|
cwd = source_path if Path(source_path).exists() else None
|
|
creds = app.config.get("ANSIBLE", {})
|
|
try:
|
|
os.makedirs(ARTIFACT_DIR, exist_ok=True)
|
|
logf = open(artifact_path(run_id), "w", encoding="utf-8")
|
|
except OSError:
|
|
logf = None # artifact is best-effort; the DB still holds capped output
|
|
|
|
# Temp dir holds the ephemeral inventory (if any) + credential files.
|
|
tmpdir = tempfile.mkdtemp(prefix="steward-ansible-")
|
|
os.chmod(tmpdir, 0o700)
|
|
try:
|
|
if inventory_content:
|
|
# .yml so Ansible's yaml inventory plugin reliably claims it
|
|
# (the plugin's verify_file checks the extension).
|
|
inv_target = os.path.join(tmpdir, "inventory.yml")
|
|
with open(inv_target, "w", encoding="utf-8") as invf:
|
|
invf.write(inventory_content)
|
|
else:
|
|
inv_target = inventory_path
|
|
cmd = build_ansible_command(playbook_path, inv_target, params)
|
|
|
|
# First-contact provisioning supplies a password and a bootstrap
|
|
# user; the managed key isn't on the host yet, so don't offer it
|
|
# (avoids a failed key attempt before the password fallback).
|
|
conn = connection or {}
|
|
effective_creds = dict(creds)
|
|
if conn.get("password"):
|
|
effective_creds.pop("ssh_private_key", None)
|
|
elif _crypto_is_encrypted(effective_creds.get("ssh_private_key") or ""):
|
|
_broadcast(run_id,
|
|
"[run error] The managed SSH key could not be decrypted "
|
|
"(the app secret key changed). Regenerate it in "
|
|
"Settings → Ansible and re-provision the host(s).")
|
|
|
|
cred_args, cred_files = build_credentials(effective_creds, tmpdir)
|
|
boot_args, boot_files = build_bootstrap(conn, tmpdir)
|
|
# Operator-entered run-time vars (persisted) + secret vars (not).
|
|
merged_vars = {**((params or {}).get("extra_vars_map") or {}), **(secret_vars or {})}
|
|
ev_args, ev_files = build_extra_vars_file(merged_vars, tmpdir)
|
|
for cred_path, content in cred_files + boot_files + ev_files:
|
|
with open(cred_path, "w", encoding="utf-8") as cf:
|
|
cf.write(content)
|
|
os.chmod(cred_path, 0o600)
|
|
|
|
# Steady-state floor: connect as the managed account unless a target
|
|
# var or the bootstrap override (extra-vars, higher precedence) wins.
|
|
user_args: list[str] = []
|
|
if not conn.get("user"):
|
|
ssh_user = (creds.get("ssh_user") or "").strip()
|
|
if ssh_user:
|
|
user_args += ["--user", ssh_user]
|
|
|
|
# Its own session, so the whole group (ssh, forks) can be signalled.
|
|
proc = await asyncio.create_subprocess_exec(
|
|
*cmd, *cred_args, *boot_args, *user_args, *ev_args,
|
|
stdout=asyncio.subprocess.PIPE,
|
|
stderr=asyncio.subprocess.STDOUT,
|
|
cwd=cwd,
|
|
env=ansible_env(creds, os.environ),
|
|
start_new_session=True,
|
|
)
|
|
_run_procs[run_id] = proc
|
|
assert proc.stdout is not None
|
|
|
|
async for raw_line in _lines(proc.stdout):
|
|
line = scrub(raw_line.decode(errors="replace").rstrip("\n\r"), secrets)
|
|
_broadcast(run_id, line)
|
|
if logf is not None:
|
|
logf.write(line + "\n")
|
|
if (line.startswith("fatal:") or "FAILED!" in line) and len(failures) < _FAILURE_CAP:
|
|
failures.append(line[:500])
|
|
|
|
if not truncated:
|
|
candidate = (db_output + "\n" + line) if db_output else line
|
|
if len(candidate.encode()) > _OUTPUT_CAP_BYTES:
|
|
db_output += "\n[output truncated — download the full log]"
|
|
truncated = True
|
|
else:
|
|
db_output = candidate
|
|
|
|
lines_since_flush += 1
|
|
elapsed = time.monotonic() - last_flush_at
|
|
if lines_since_flush >= _FLUSH_LINES or elapsed >= _FLUSH_SECS:
|
|
await _flush()
|
|
|
|
await proc.wait()
|
|
recap = parse_recap(_run_lines.get(run_id, []))
|
|
# A cancel that lands after the run finished doesn't undo its result.
|
|
if run_id in _cancelled and proc.returncode != 0:
|
|
final_status = "cancelled"
|
|
elif proc.returncode != 0:
|
|
final_status = "failed"
|
|
elif not recap:
|
|
# ansible-playbook exits 0 on "no hosts matched" / empty inventory
|
|
# — nothing actually ran, so don't report it as a success.
|
|
final_status = "failed"
|
|
if len(failures) < _FAILURE_CAP:
|
|
failures.append(
|
|
"No hosts matched — nothing executed "
|
|
"(check the host's Ansible target and inventory).")
|
|
else:
|
|
final_status = "success"
|
|
finally:
|
|
# Whatever ended the read (the run finishing, an error, the task
|
|
# being cancelled), nothing the run started outlives it.
|
|
if proc is not None:
|
|
await asyncio.shield(_terminate_then_kill(proc, grace=5.0))
|
|
shutil.rmtree(tmpdir, ignore_errors=True)
|
|
|
|
except _Aborted:
|
|
final_status = "cancelled"
|
|
except asyncio.CancelledError:
|
|
# The task itself was cancelled (shutdown): record that the run did
|
|
# not finish rather than leave it marked running (#5156).
|
|
final_status, interrupted = "cancelled", True
|
|
msg = "[run error] Steward stopped the run before it finished."
|
|
_broadcast(run_id, msg)
|
|
db_output = (db_output + "\n" + msg) if db_output else msg
|
|
except Exception as exc:
|
|
logger.exception("Ansible run %s failed with exception", run_id)
|
|
final_status = "cancelled" if run_id in _cancelled else "failed"
|
|
# Surface WHY in the run output instead of an empty "failed" (e.g. ENOSPC
|
|
# when the temp dir can't be created — the run never reaches Ansible).
|
|
msg = scrub(f"[run error] {type(exc).__name__}: {exc}", secrets)
|
|
_broadcast(run_id, msg)
|
|
if len(failures) < _FAILURE_CAP:
|
|
failures.append(msg[:500])
|
|
db_output = (db_output + "\n" + msg) if db_output else msg
|
|
finally:
|
|
if logf is not None:
|
|
logf.close()
|
|
_run_procs.pop(run_id, None)
|
|
_cancelled.discard(run_id)
|
|
sem.release()
|
|
|
|
results = {"hosts": parse_recap(_run_lines.get(run_id, [])), "failures": failures}
|
|
try:
|
|
await asyncio.shield(_flush(final_status, results=results))
|
|
except Exception:
|
|
logger.exception("Ansible run %s: could not record its final status %s",
|
|
run_id, final_status)
|
|
_broadcast(run_id, _Done(status=final_status))
|
|
if interrupted:
|
|
raise asyncio.CancelledError
|