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https://github.com/NousResearch/hermes-agent.git
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85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
"""Context-local state for delegate_task child execution.
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The parent Hermes process may itself be a Kanban dispatcher worker with
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HERMES_KANBAN_* variables in process env. delegate_task children run inside the
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same Python process, but they are not dispatcher-owned Kanban workers. This
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module lets code paths that resolve tool schemas or spawn subprocesses fail
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closed for delegated children without mutating global os.environ for the parent.
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"""
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from __future__ import annotations
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from contextlib import contextmanager
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from contextvars import ContextVar
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from typing import Iterator, Mapping, MutableMapping
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_DELEGATED_CHILD_CONTEXT: ContextVar[bool] = ContextVar(
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"hermes_delegated_child_context",
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default=False,
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)
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DELEGATED_CHILD_ENV_MARKER = "HERMES_DELEGATED_CHILD_CONTEXT"
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KANBAN_ENV_KEYS: tuple[str, ...] = (
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"HERMES_KANBAN_TASK",
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"HERMES_KANBAN_RUN_ID",
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"HERMES_KANBAN_WORKSPACE",
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"HERMES_KANBAN_WORKSPACES_ROOT",
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"HERMES_KANBAN_CLAIM_LOCK",
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"HERMES_KANBAN_BOARD",
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"HERMES_KANBAN_DB",
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)
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@contextmanager
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def delegated_child_context() -> Iterator[None]:
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"""Mark the current execution context as a delegate_task child."""
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token = _DELEGATED_CHILD_CONTEXT.set(True)
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try:
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yield
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finally:
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_DELEGATED_CHILD_CONTEXT.reset(token)
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def is_delegated_child_context() -> bool:
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"""Return True while code is running for a delegate_task child."""
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return bool(_DELEGATED_CHILD_CONTEXT.get())
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def is_delegated_child_process_context() -> bool:
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"""Return True in this process or a subprocess spawned by a child."""
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import os
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return bool(_DELEGATED_CHILD_CONTEXT.get()) or bool(
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os.environ.get(DELEGATED_CHILD_ENV_MARKER)
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)
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def scrub_kanban_env(env: Mapping[str, str] | MutableMapping[str, str]) -> dict[str, str]:
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"""Return *env* with dispatcher-only Kanban variables removed."""
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cleaned = dict(env)
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for key in KANBAN_ENV_KEYS:
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cleaned.pop(key, None)
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cleaned[DELEGATED_CHILD_ENV_MARKER] = "1"
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return cleaned
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def delegated_child_subprocess_env(
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env: Mapping[str, str] | MutableMapping[str, str] | None = None,
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) -> dict[str, str] | None:
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"""Return an env override only when delegated-child lineage must cross fork.
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Most subprocess call sites historically used ``env=None`` to inherit the
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process environment. In a ``delegate_task`` child, inheriting as-is leaks
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parent dispatcher ``HERMES_KANBAN_*`` vars while losing the ContextVar in
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the new process. This helper preserves normal ``env=None`` semantics for
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non-delegated calls, and only materializes a scrubbed env when the lineage
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marker must be propagated across a child-process boundary.
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"""
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if not is_delegated_child_process_context():
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return None if env is None else dict(env)
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if env is None:
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import os
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env = os.environ
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return scrub_kanban_env(env)
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