4121aa295a
Concurrent invocations of the same tool in one session collapsed into a single busy key (hook_name, id(cb)): the second invocation was reported as 'still running' and dropped. For pre_tool_call a drop is a fail-closed block, so the gate silenced itself on an ordinary, healthy callback. Measured on a busy profile: 3574 skip lines and 0 timeout lines in one hour — every skip was the 'while still running' branch, i.e. pure key collision, not slowness. The gate now keys on the call identity that is already in the payload (tool_call_id, else turn_id, else none — the last case behaves exactly as before). Suppression stays keyed coarsely on (hook_name, id(cb)): a hung callback is a fact about the callback, so its back-off must not be diluted per call. Refs #98382. Independent of #107894 (that one releases the slot on timeout; this one stops healthy concurrency from colliding). (cherry picked from commit 53b3dacd008418fcdf5fa6dfcadde575a35a776e)
495 lines
23 KiB
Python
495 lines
23 KiB
Python
"""Plugin hook / middleware / event-bus / system-prompt-section dispatch.
|
|
|
|
Mixed into :class:`hermes_cli.plugins.PluginManager`. ``_resolve_hook_callback_timeout`` stays on
|
|
the origin (tests patch it there) and is looked up lazily.
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
import contextvars
|
|
import copy
|
|
import inspect
|
|
import logging
|
|
import queue
|
|
import re
|
|
import threading
|
|
import time
|
|
import types
|
|
from dataclasses import dataclass
|
|
from typing import Any, Callable, Dict, List, Mapping, Optional, Set, Union
|
|
|
|
from hermes_cli.middleware import OBSERVER_SCHEMA_VERSION
|
|
|
|
logger = logging.getLogger("hermes_cli.plugins")
|
|
|
|
# Allowlist of agent-turn hot-path hooks bounded by plugins.hook_callback_timeout (fail-open:
|
|
# abandon without join — joining reintroduced a shutdown hang). Unlisted hooks run synchronously.
|
|
# Intentionally unbounded: on_session_finalize/reset (last-chance flush — abandon can lose state);
|
|
# subagent_start (observer); pre_gateway_dispatch (policy gate — neither fail mode is acceptable);
|
|
# pre/post_approval_* (approval UX has its own timeout); kanban_* (own heartbeat/stale reclaim).
|
|
# The goal is to stop a hung Python plugin callback from wedging the conversation loop (#76821) without
|
|
# joining the worker (avoids the #6622 ThreadPoolExecutor shutdown hang). Hooks not listed below run
|
|
# synchronously to completion. (on_session_start/end stay bounded — they sit on the common session-boundary
|
|
# path.) - subagent_start — observer only; blocking delegation belongs in pre_tool_call. Lower frequency
|
|
# than tool/LLM hooks. Abandoning is unsafe either way (fail-open skips auth-like checks; fail-closed can
|
|
# drop legitimate messages). Prefer finish-or-exception fallthrough. - pre_approval_request /
|
|
# post_approval_response — observers only (cannot veto); the approval UX already has its own timeout; not on
|
|
# the tool loop hot path. - kanban_task_* — fire after the board DB commit, observers only, in
|
|
# dispatcher/worker processes; kanban has its own heartbeat/stale reclaim. Abandon-without-join also leaves
|
|
# a daemon thread that may still mutate shared state — safer for value-returning observers than for
|
|
# gates/flushes.
|
|
_HOOK_TIMEOUT_BOUNDED_HOOKS: Set[str] = {
|
|
"post_tool_call", "transform_terminal_output", "transform_tool_result", "transform_llm_output",
|
|
"pre_llm_call", "post_llm_call", "pre_api_request", "post_api_request", "api_request_error",
|
|
"pre_verify", "on_session_start", "on_session_end",
|
|
}
|
|
|
|
# Policy hooks: timeout / still-running must fail closed (block the tool).
|
|
_HOOK_TIMEOUT_FAIL_CLOSED_HOOKS: Set[str] = {"pre_tool_call"}
|
|
# Documented parent-thread serialization contract — never run on a timeout worker (hooks.md).
|
|
_HOOK_CALLER_THREAD_HOOKS: Set[str] = {"subagent_stop"}
|
|
# After a timeout, suppress the same callback this long so a hung hook cannot pile up threads.
|
|
_HOOK_TIMEOUT_SUPPRESSION_SECONDS = 60.0
|
|
_PRE_TOOL_CALL_TIMEOUT_BLOCK_MESSAGE = "pre_tool_call plugin callback timed out or is still running"
|
|
|
|
# System-prompt sections are tightly bounded: they become high-trust prompt bytes charged every turn.
|
|
SYSTEM_PROMPT_SECTION_POSITIONS = frozenset({"after_memory"})
|
|
DEFAULT_SYSTEM_PROMPT_SECTION_MAX_CHARS = 4_000
|
|
MAX_SYSTEM_PROMPT_SECTION_CHARS = 4_000
|
|
MAX_SYSTEM_PROMPT_SECTIONS = 32
|
|
MAX_SYSTEM_PROMPT_SECTIONS_TOTAL_CHARS = 8_000
|
|
_SYSTEM_PROMPT_SECTION_ID_RE = re.compile(r"^[a-z0-9][a-z0-9._-]{0,127}$")
|
|
_SYSTEM_PROMPT_SECTION_HEADING_PREFIX = "## Plugin Context: "
|
|
PLUGIN_SECTIONS_START = "<!-- hermes-plugin-sections:start -->"
|
|
PLUGIN_SECTIONS_END = "<!-- hermes-plugin-sections:end -->"
|
|
|
|
|
|
def is_valid_system_prompt_section_id(value: Any) -> bool:
|
|
"""Return whether *value* is a stable, heading-safe section identifier."""
|
|
return isinstance(value, str) and bool(_SYSTEM_PROMPT_SECTION_ID_RE.fullmatch(value))
|
|
|
|
|
|
def format_system_prompt_section(section_id: str, content: str) -> str:
|
|
"""Render an auditable, length-framed block recoverable from the full prompt."""
|
|
return (
|
|
f"{_SYSTEM_PROMPT_SECTION_HEADING_PREFIX}{section_id}\n"
|
|
f"<!-- hermes-plugin-section-chars:{len(content)} -->\n\n{content}")
|
|
|
|
|
|
def format_system_prompt_sections(sections: list) -> str:
|
|
"""Render the canonical container used for persistence recovery."""
|
|
if not sections:
|
|
return ""
|
|
blocks = [format_system_prompt_section(item.id, item.content) for item in sections]
|
|
return f"{PLUGIN_SECTIONS_START}\n" + "\n\n".join(blocks) + f"\n{PLUGIN_SECTIONS_END}"
|
|
|
|
|
|
# Reserved event namespace prefix — only core may publish ``hermes:<event>``.
|
|
HERMES_EVENT_NAMESPACE = "hermes"
|
|
# Event recursion depth cap (subscribers may emit); over-deep emits are dropped with a warning.
|
|
_EVENT_EMIT_DEPTH_CAP = 8
|
|
# Max queued + running events per manager generation; emit never waits — a full budget drops.
|
|
_EVENT_PENDING_CAP = 64
|
|
_EVENT_WORKER_STOP = object()
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class PluginSystemPromptSection:
|
|
"""A plugin-owned section rendered once for each new session."""
|
|
|
|
id: str
|
|
content: Union[str, Callable[[Mapping[str, Any]], str]]
|
|
position: str
|
|
max_chars: int
|
|
plugin: str
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class RenderedPluginSystemPromptSection:
|
|
"""Validated prompt bytes frozen on the owning AIAgent."""
|
|
|
|
id: str
|
|
content: str
|
|
position: str
|
|
plugin: str
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class _EventSubscription:
|
|
"""Host-owned subscription ledger entry."""
|
|
|
|
owner: str
|
|
callback: Callable
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class _QueuedPluginEvent:
|
|
"""Immutable dispatch envelope consumed by the event worker."""
|
|
|
|
event: str
|
|
payload: Dict[str, Any]
|
|
subscriptions: tuple[_EventSubscription, ...]
|
|
depth: int
|
|
generation: int
|
|
|
|
|
|
# Hook callback timeout (non-blocking abandon). Default cap per Python hook callback; overridden by
|
|
# ``plugins.hook_callback_timeout``. Shell hooks enforce their own subprocess timeout.
|
|
_HOOK_CALLBACK_TIMEOUT_SECS = 30.0
|
|
_MAX_HOOK_CALLBACK_TIMEOUT_SECS = 600.0
|
|
_HOOK_SKIPPED = object() # returned by _run_hook_callback_bounded on skip/timeout
|
|
|
|
|
|
def _hook_call_identity(kwargs: Dict[str, Any]) -> Any:
|
|
"""Identity of the call this callback fires for, or ``None`` when the event has none.
|
|
|
|
Concurrent invocations of the same tool in one session must not collapse into one
|
|
gate key: they are different work, and treating the second as a duplicate drops the
|
|
hook as if a callback had timed out (upstream #98382). The identity is already in the
|
|
payload; nothing new is plumbed. Deliberately not ``api_request_id`` — one API request
|
|
carries many tool calls, which would re-collapse the keys.
|
|
"""
|
|
for field in ("tool_call_id", "turn_id"):
|
|
value = kwargs.get(field)
|
|
if isinstance(value, str) and value:
|
|
return value
|
|
return None
|
|
|
|
|
|
def _hook_uses_callback_timeout(hook_name: str, timeout: float) -> bool:
|
|
"""Whether *hook_name* should run under the non-blocking timeout path."""
|
|
if timeout <= 0 or hook_name in _HOOK_CALLER_THREAD_HOOKS:
|
|
return False
|
|
return hook_name in _HOOK_TIMEOUT_BOUNDED_HOOKS or hook_name in _HOOK_TIMEOUT_FAIL_CLOSED_HOOKS
|
|
|
|
|
|
class PluginDispatchMixin:
|
|
@staticmethod
|
|
def _invoke_hook_callback(callback: Callable, payload: Dict[str, Any]) -> Any:
|
|
"""Invoke a hook while withholding additive fields from narrow legacy callbacks.
|
|
|
|
An ``async def`` callback returns a coroutine; resolve it the way plugin slash commands
|
|
are (loop-safe), otherwise the bare coroutine object is appended to the results and the
|
|
plugin's body never runs (#12449).
|
|
"""
|
|
from hermes_cli.plugins import resolve_plugin_command_result
|
|
try:
|
|
parameters = inspect.signature(callback).parameters
|
|
except (TypeError, ValueError):
|
|
return resolve_plugin_command_result(callback(**payload)) # no introspectable signature
|
|
if any(p.kind == inspect.Parameter.VAR_KEYWORD for p in parameters.values()):
|
|
return resolve_plugin_command_result(callback(**payload))
|
|
keyword_kinds = {inspect.Parameter.POSITIONAL_OR_KEYWORD, inspect.Parameter.KEYWORD_ONLY}
|
|
return resolve_plugin_command_result(callback(**{
|
|
name: value for name, value in payload.items()
|
|
if name in parameters and parameters[name].kind in keyword_kinds
|
|
}))
|
|
|
|
def invoke_hook(self, hook_name: str, **kwargs: Any) -> List[Any]:
|
|
"""Call all callbacks for *hook_name*; return their non-``None`` results.
|
|
|
|
Payloads evolve additively: ``**kwargs`` callbacks get everything, narrow signatures only
|
|
what they declare. Each callback is isolated. Bounded hooks and ``pre_tool_call`` run under
|
|
``plugins.hook_callback_timeout`` (worker abandoned, never joined); ``pre_tool_call`` fails
|
|
closed with a block directive, others skip. ``_HOOK_CALLER_THREAD_HOOKS`` always run on the
|
|
caller thread. ``pre_llm_call`` may return ``{"context": "..."}`` (or a str) to inject.
|
|
"""
|
|
from hermes_cli.plugins import _resolve_hook_callback_timeout
|
|
# Gateway platform events define event-local envelopes; a bus-wide version here would turn
|
|
# unrelated adapter payloads into one monolithic compatibility contract.
|
|
if hook_name != "gateway_platform_event":
|
|
kwargs.setdefault("telemetry_schema_version", OBSERVER_SCHEMA_VERSION)
|
|
results: List[Any] = []
|
|
timeout = _resolve_hook_callback_timeout()
|
|
use_timeout = _hook_uses_callback_timeout(hook_name, timeout)
|
|
fail_closed = hook_name in _HOOK_TIMEOUT_FAIL_CLOSED_HOOKS
|
|
for cb in self._hooks.get(hook_name, []):
|
|
try:
|
|
if use_timeout:
|
|
ret = self._run_hook_callback_bounded(hook_name, cb, kwargs, timeout)
|
|
if ret is _HOOK_SKIPPED:
|
|
if fail_closed: # policy hook: fail closed with a block directive
|
|
results.append({"action": "block", "message": _PRE_TOOL_CALL_TIMEOUT_BLOCK_MESSAGE})
|
|
continue
|
|
else:
|
|
ret = self._invoke_hook_callback(cb, kwargs)
|
|
if ret is not None:
|
|
results.append(ret)
|
|
except Exception as exc:
|
|
logger.warning(
|
|
"Hook '%s' callback %s raised: %s", hook_name, getattr(cb, "__name__", repr(cb)), exc)
|
|
return results
|
|
|
|
def _run_hook_callback_bounded(
|
|
self, hook_name: str, cb: Callable, kwargs: Dict[str, Any], timeout: float
|
|
) -> Any:
|
|
"""Run one callback on a daemon worker with a wall-clock cap; ``_HOOK_SKIPPED`` when
|
|
suppressed, still running, timed out (worker abandoned, never joined), or the worker
|
|
could not be started. Exceptions propagate."""
|
|
callback_name = getattr(cb, "__name__", repr(cb))
|
|
# Suppression is a fact about the CALLBACK — a hung one must keep its back-off —
|
|
# so that key stays coarse. The gate must instead tell CONCURRENT CALLS apart.
|
|
suppression_key = (hook_name, id(cb))
|
|
gate_key = (*suppression_key, _hook_call_identity(kwargs))
|
|
token = object()
|
|
with self._hook_timeout_lock:
|
|
suppressed_until = self._hook_timeout_suppressed_until.get(suppression_key)
|
|
running = gate_key in self._hook_running_callbacks
|
|
if (suppressed_until is not None and suppressed_until > time.monotonic()) or running:
|
|
logger.warning(
|
|
"Hook '%s' callback %s skipped after previous "
|
|
"timeout or while still running", hook_name, callback_name)
|
|
return _HOOK_SKIPPED
|
|
if suppressed_until is not None:
|
|
self._hook_timeout_suppressed_until.pop(suppression_key, None)
|
|
self._hook_running_callbacks[gate_key] = token
|
|
|
|
context = contextvars.copy_context()
|
|
done = threading.Event()
|
|
outcome: Dict[str, Any] = {}
|
|
failure: Dict[str, Exception] = {}
|
|
|
|
def _release_token() -> None:
|
|
with self._hook_timeout_lock:
|
|
if self._hook_running_callbacks.get(gate_key) is token:
|
|
self._hook_running_callbacks.pop(gate_key, None)
|
|
|
|
def _runner() -> None:
|
|
try:
|
|
outcome["value"] = context.run(self._invoke_hook_callback, cb, kwargs)
|
|
except Exception as exc:
|
|
failure["exc"] = exc
|
|
finally:
|
|
_release_token()
|
|
done.set()
|
|
|
|
thread = threading.Thread(target=_runner, name=f"hermes-hook-{callback_name}"[:40], daemon=True)
|
|
try:
|
|
thread.start()
|
|
except RuntimeError as exc:
|
|
_release_token() # the runner's finally never runs when OS thread creation fails
|
|
logger.warning(
|
|
"Hook '%s' callback %s worker failed to start: %s — skipping",
|
|
hook_name, callback_name, exc)
|
|
return _HOOK_SKIPPED
|
|
if not done.wait(timeout=timeout): # do not join — that would reintroduce the hang
|
|
with self._hook_timeout_lock:
|
|
# See #6622.
|
|
self._hook_timeout_suppressed_until[suppression_key] = (
|
|
time.monotonic() + self._hook_timeout_suppression_seconds)
|
|
logger.warning(
|
|
"Hook '%s' callback %s timed out after %gs — skipping", hook_name, callback_name, timeout)
|
|
return _HOOK_SKIPPED
|
|
if "exc" in failure:
|
|
raise failure["exc"]
|
|
return outcome.get("value")
|
|
|
|
def _subscribe_event(self, owner: str, event: str, callback: Callable) -> None:
|
|
"""Add an owner-tagged event subscription in registration order."""
|
|
if not callable(callback):
|
|
raise TypeError("Event subscriber callback must be callable")
|
|
with self._event_lock:
|
|
self._subscriptions.setdefault(event, []).append(_EventSubscription(owner, callback))
|
|
|
|
def _remove_plugin_subscriptions(self, owner: str) -> int:
|
|
"""Remove every subscription owned by *owner*; return the count. Queued envelopes re-check
|
|
membership per callback, so this also cancels already-snapshotted deliveries.
|
|
|
|
TODO(#64229): when the central plugin ownership ledger / registration handles land, route this
|
|
owner-tagged bookkeeping through that ledger so per-plugin unload cancels event subscriptions
|
|
alongside every other registration surface. This method is the integration seam.
|
|
"""
|
|
removed = 0
|
|
with self._event_lock:
|
|
for event in list(self._subscriptions):
|
|
entries = self._subscriptions[event]
|
|
retained = [entry for entry in entries if entry.owner != owner]
|
|
removed += len(entries) - len(retained)
|
|
if retained:
|
|
self._subscriptions[event] = retained
|
|
else:
|
|
del self._subscriptions[event]
|
|
return removed
|
|
|
|
def _ensure_event_worker_locked(self) -> None:
|
|
worker = self._event_worker
|
|
if worker is not None and worker.is_alive():
|
|
return
|
|
worker = threading.Thread(
|
|
target=self._event_worker_loop, args=(self._event_queue,), name="hermes-plugin-events",
|
|
daemon=True,
|
|
)
|
|
self._event_worker = worker
|
|
worker.start()
|
|
|
|
def _event_worker_loop(self, dispatch_queue: queue.Queue[Any]) -> None:
|
|
while True:
|
|
item = dispatch_queue.get()
|
|
try:
|
|
if item is _EVENT_WORKER_STOP:
|
|
return
|
|
self._deliver_event(item)
|
|
finally:
|
|
if item is not _EVENT_WORKER_STOP:
|
|
self._mark_event_done(item.generation)
|
|
dispatch_queue.task_done()
|
|
|
|
def _mark_event_done(self, generation: int) -> None:
|
|
with self._event_idle:
|
|
pending = self._event_pending_by_generation.get(generation, 0)
|
|
if pending > 0:
|
|
self._event_pending_by_generation[generation] = pending - 1
|
|
self._event_idle.notify_all()
|
|
|
|
def _deliver_event(self, item: _QueuedPluginEvent) -> None:
|
|
"""Deliver one queued event on the host-owned worker thread."""
|
|
from hermes_cli.plugins import resolve_plugin_command_result
|
|
with self._event_lock:
|
|
if item.generation != self._event_generation:
|
|
return
|
|
previous_depth = getattr(self._emit_depth, "value", 0)
|
|
self._emit_depth.value = item.depth
|
|
try:
|
|
for subscription in item.subscriptions:
|
|
with self._event_lock:
|
|
if item.generation != self._event_generation:
|
|
break
|
|
# Owner unload may have removed this entry after the event was queued.
|
|
if not any(cur is subscription for cur in self._subscriptions.get(item.event, [])):
|
|
continue
|
|
callback = subscription.callback
|
|
try:
|
|
# Fresh deep copy per subscriber: no callback can mutate what the next sees.
|
|
resolve_plugin_command_result(callback(**copy.deepcopy(item.payload)))
|
|
except Exception as exc:
|
|
logger.warning(
|
|
"Event '%s' subscriber %s raised: %s", item.event,
|
|
getattr(callback, "__name__", repr(callback)), exc)
|
|
finally:
|
|
self._emit_depth.value = previous_depth
|
|
|
|
def _wait_for_event_dispatch(self, timeout: float = 2.0) -> bool:
|
|
"""Wait for the current event generation to become idle (test helper)."""
|
|
with self._event_idle:
|
|
generation = self._event_generation
|
|
return self._event_idle.wait_for(
|
|
lambda: self._event_pending_by_generation.get(generation, 0) == 0, timeout=timeout)
|
|
|
|
def _dispatch_event(self, event: str, payload: Dict[str, Any]) -> int:
|
|
"""Queue *event* without blocking; return the subscriber count scheduled. Pending work is
|
|
bounded per generation so a blocking subscriber costs one worker and later emits drop."""
|
|
depth = getattr(self._emit_depth, "value", 0)
|
|
if depth >= _EVENT_EMIT_DEPTH_CAP:
|
|
logger.warning(
|
|
"Event bus recursion cap (%d) exceeded while dispatching '%s' "
|
|
"— dropping this emit to prevent an infinite loop", _EVENT_EMIT_DEPTH_CAP, event)
|
|
return 0
|
|
budget_msg = "Event bus pending budget (%d) exhausted while dispatching '%s' — dropping this emit"
|
|
with self._event_lock:
|
|
subscriptions = tuple(self._subscriptions.get(event, []))
|
|
if not subscriptions:
|
|
return 0
|
|
generation = self._event_generation
|
|
pending = self._event_pending_by_generation.get(generation, 0)
|
|
if pending >= _EVENT_PENDING_CAP:
|
|
logger.warning(budget_msg, _EVENT_PENDING_CAP, event)
|
|
return 0
|
|
item = _QueuedPluginEvent(
|
|
event=event, payload=dict(payload), subscriptions=subscriptions, depth=depth + 1,
|
|
generation=generation)
|
|
try:
|
|
self._event_queue.put_nowait(item)
|
|
except queue.Full:
|
|
logger.warning(budget_msg, _EVENT_PENDING_CAP, event)
|
|
return 0
|
|
self._event_pending_by_generation[generation] = pending + 1
|
|
self._ensure_event_worker_locked()
|
|
return len(subscriptions)
|
|
|
|
def has_hook(self, hook_name: str) -> bool:
|
|
"""Return True when at least one callback is registered for a hook."""
|
|
return bool(self._hooks.get(hook_name))
|
|
|
|
def iter_hook_callbacks(self, hook_name: str) -> tuple[Callable, ...]:
|
|
"""Return a stable snapshot of callbacks registered for a hook."""
|
|
return tuple(self._hooks.get(hook_name, ()))
|
|
|
|
def render_system_prompt_sections(
|
|
self, session_info: Mapping[str, Any]
|
|
) -> List[RenderedPluginSystemPromptSection]:
|
|
"""Render all registered sections deterministically and fail open."""
|
|
frozen_info = types.MappingProxyType(dict(session_info))
|
|
rendered: List[RenderedPluginSystemPromptSection] = []
|
|
total_chars = len(PLUGIN_SECTIONS_START) + len(PLUGIN_SECTIONS_END) + 2
|
|
for _section_id, section in sorted(self._system_prompt_sections.items()):
|
|
if len(rendered) >= MAX_SYSTEM_PROMPT_SECTIONS:
|
|
logger.warning(
|
|
"Plugin system prompt section %s exceeded the section-count "
|
|
"budget (%d) and was skipped", section.id, MAX_SYSTEM_PROMPT_SECTIONS)
|
|
continue
|
|
text = self._render_prompt_section_text(section, frozen_info)
|
|
if text is None:
|
|
continue
|
|
rendered_chars = len(format_system_prompt_section(section.id, text))
|
|
if rendered:
|
|
rendered_chars += 2 # canonical ``\n\n`` separator
|
|
if total_chars + rendered_chars > MAX_SYSTEM_PROMPT_SECTIONS_TOTAL_CHARS:
|
|
logger.warning(
|
|
"Plugin system prompt section %s (%s) exceeded the aggregate "
|
|
"session budget (%d chars) and was skipped", section.id, section.plugin,
|
|
MAX_SYSTEM_PROMPT_SECTIONS_TOTAL_CHARS)
|
|
continue
|
|
rendered.append(
|
|
RenderedPluginSystemPromptSection(
|
|
id=section.id, content=text, position=section.position, plugin=section.plugin))
|
|
total_chars += rendered_chars
|
|
logger.info(
|
|
"Session plugin prompt section: id=%s plugin=%s position=%s chars=%d", section.id,
|
|
section.plugin, section.position, len(text))
|
|
return rendered
|
|
|
|
@staticmethod
|
|
def _render_prompt_section_text(
|
|
section: PluginSystemPromptSection, frozen_info: Mapping[str, Any]
|
|
) -> Optional[str]:
|
|
"""Evaluate one section; return its stripped text or None (with a warning) when skipped."""
|
|
def _skip(detail: str, *args: Any) -> None:
|
|
logger.warning(
|
|
"Plugin system prompt section %s (%s) " + detail, section.id, section.plugin, *args)
|
|
|
|
try:
|
|
value = section.content(frozen_info) if callable(section.content) else section.content
|
|
except Exception as exc:
|
|
_skip("raised and was skipped: %s", exc)
|
|
return None
|
|
if not isinstance(value, str):
|
|
_skip("returned %s, not str; skipped", type(value).__name__)
|
|
return None
|
|
text = value.strip()
|
|
if not text:
|
|
return None
|
|
if PLUGIN_SECTIONS_START in text or PLUGIN_SECTIONS_END in text:
|
|
_skip("contained a reserved persistence marker and was skipped")
|
|
return None
|
|
if len(text) > section.max_chars:
|
|
_skip("exceeded max_chars (%d > %d) and was skipped", len(text), section.max_chars)
|
|
return None
|
|
return text
|
|
|
|
def has_middleware(self, kind: str) -> bool:
|
|
"""Return True when at least one callback is registered for middleware."""
|
|
return bool(self._middleware.get(kind))
|
|
|
|
def invoke_middleware(self, kind: str, **kwargs: Any) -> List[Any]:
|
|
"""Call middleware callbacks for *kind* (each isolated); return non-``None`` results."""
|
|
results: List[Any] = []
|
|
for cb in self._middleware.get(kind, []):
|
|
try:
|
|
ret = cb(**kwargs)
|
|
if ret is not None:
|
|
results.append(ret)
|
|
except Exception as exc:
|
|
logger.warning(
|
|
"Middleware '%s' callback %s raised: %s", kind, getattr(cb, "__name__", repr(cb)), exc)
|
|
return results
|