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from __future__ import annotations
import asyncio
from collections.abc import Callable, Iterable
from dataclasses import dataclass, field
from loguru import logger
from free_claude_code.application.errors import ApplicationUnavailableError
from free_claude_code.application.model_metadata import (
ProviderModelInfo,
ProviderModelRefreshResult,
)
from free_claude_code.config.settings import Settings
from free_claude_code.core.trace import trace_event
from free_claude_code.providers.base import BaseProvider
from free_claude_code.providers.runtime import ProviderRuntime
from free_claude_code.providers.runtime.discovery import (
ProviderModelDiscovery,
model_cache_provider_ids_for_settings,
)
from free_claude_code.providers.runtime.model_cache import ProviderModelCache
ProviderRuntimeFactory = Callable[[Settings], ProviderRuntime]
ConnectedProviderIds = Callable[[], tuple[str, ...]]
CommitConfig = Callable[[], None]
@dataclass(slots=True, eq=False)
class _ProviderGeneration:
generation_id: int
settings: Settings
runtime: ProviderRuntime
active_leases: int = 0
retired: bool = False
closed: bool = False
drained: asyncio.Event = field(default_factory=asyncio.Event)
cleanup_task: asyncio.Task[bool] | None = None
def __post_init__(self) -> None:
self.drained.set()
class ProviderGenerationLease:
"""Idempotent lease retaining one provider generation."""
def __init__(
self,
manager: ProviderRuntimeManager,
generation: _ProviderGeneration,
) -> None:
self._manager = manager
self._generation = generation
self._released = False
@property
def generation_id(self) -> int:
return self._generation.generation_id
@property
def settings(self) -> Settings:
return self._generation.settings
def is_provider_cached(self, provider_id: str) -> bool:
return self._generation.runtime.is_cached(provider_id)
def resolve_provider(self, provider_id: str) -> BaseProvider:
return self._generation.runtime.resolve_provider(provider_id)
async def release(self) -> None:
if self._released:
return
self._released = True
await self._manager._release(self._generation)
async def __aenter__(self) -> ProviderGenerationLease:
return self
async def __aexit__(self, *_exc: object) -> None:
await self.release()
class ProviderRuntimeManager:
"""Own provider generations, leases, discovery, and model metadata."""
def __init__(
self,
settings: Settings,
*,
runtime_factory: ProviderRuntimeFactory = ProviderRuntime,
connected_provider_ids: ConnectedProviderIds = tuple,
) -> None:
self._runtime_factory = runtime_factory
self._connected_provider_ids = connected_provider_ids
self._replace_lock = asyncio.Lock()
self._close_lock = asyncio.Lock()
self._model_cache = ProviderModelCache(
model_cache_provider_ids_for_settings(settings, connected_provider_ids())
)
self._refresh_task: asyncio.Task[None] | None = None
self._next_generation_id = 2
self._retired: dict[int, _ProviderGeneration] = {}
self._unpublished: set[ProviderRuntime] = set()
self._closing = False
self._closed = False
self._current = _ProviderGeneration(
generation_id=1,
settings=settings,
runtime=runtime_factory(settings),
)
self._trace_published(self._current, previous=None, reason="startup")
@property
def current_generation_id(self) -> int:
return self._current.generation_id
async def acquire(self) -> ProviderGenerationLease:
if self._closing or self._closed:
raise ApplicationUnavailableError("Provider runtime is shutting down.")
generation = self._current
generation.active_leases += 1
generation.drained.clear()
return ProviderGenerationLease(self, generation)
def current_settings(self) -> Settings:
return self._current.settings
def cached_model_ids(self) -> dict[str, frozenset[str]]:
self._synchronize_model_cache_scope()
return self._model_cache.cached_model_ids()
def cached_model_supports_thinking(
self, provider_id: str, model_id: str
) -> bool | None:
self._synchronize_model_cache_scope()
return self._model_cache.cached_model_supports_thinking(provider_id, model_id)
def cached_prefixed_model_infos(self) -> tuple[ProviderModelInfo, ...]:
self._synchronize_model_cache_scope()
return self._model_cache.cached_prefixed_model_infos()
def cache_model_infos(
self,
provider_id: str,
model_infos: Iterable[ProviderModelInfo],
) -> None:
self._model_cache.cache_model_infos(provider_id, model_infos)
async def warm_referenced_model_cache(self) -> ProviderModelRefreshResult:
"""Warm routed provider catalogs before clients perform model discovery."""
lease = await self.acquire()
try:
discovery = ProviderModelDiscovery(
lease.settings,
lease.resolve_provider,
self._model_cache,
self._connected_provider_ids(),
)
return await discovery.warm_referenced_model_cache()
finally:
await lease.release()
def start_model_list_refresh(self) -> None:
"""Start one non-blocking refresh for the current generation."""
if self._closing or self._closed:
return
if self._refresh_task is not None and not self._refresh_task.done():
return
generation = self._current
self._refresh_task = asyncio.create_task(
self._refresh_generation_in_background(generation, only_missing=True)
)
async def refresh_model_list_cache(self) -> ProviderModelRefreshResult:
"""Run an explicit full refresh without racing replacement."""
async with self._replace_lock:
if self._closing or self._closed:
raise ApplicationUnavailableError("Provider runtime is shutting down.")
await self._cancel_refresh()
return await self._refresh_generation(self._current, only_missing=False)
async def connected_provider_changed(
self, provider_id: str, *, connected: bool
) -> ProviderModelRefreshResult:
"""Synchronize one connected account without replacing a generation."""
async with self._replace_lock:
if self._closing or self._closed:
raise ApplicationUnavailableError("Provider runtime is shutting down.")
if not connected:
self._model_cache.remove_provider(provider_id)
return ProviderModelRefreshResult()
self._model_cache.add_provider(provider_id)
discovery = ProviderModelDiscovery(
self._current.settings,
self._current.runtime.resolve_provider,
self._model_cache,
self._connected_provider_ids(),
)
return await discovery.refresh_provider(provider_id)
def _synchronize_model_cache_scope(self) -> None:
"""Drop metadata whose settings or connected account is no longer usable."""
self._model_cache.set_available_providers(
model_cache_provider_ids_for_settings(
self._current.settings, self._connected_provider_ids()
)
)
async def replace(
self,
settings: Settings,
*,
commit: CommitConfig,
reason: str = "admin_apply",
) -> int:
"""Prepare, commit, and atomically publish one replacement generation."""
async with self._replace_lock:
if self._closing or self._closed:
raise ApplicationUnavailableError("Provider runtime is shutting down.")
await self._cancel_refresh()
await self._retry_unpublished_cleanup()
candidate_id = self._next_generation_id
candidate_runtime: ProviderRuntime | None = None
try:
candidate_runtime = self._runtime_factory(settings)
commit()
except Exception as exc:
trace_event(
stage="runtime",
event="provider_generation.replace_failed",
source="runtime",
current_generation_id=self._current.generation_id,
candidate_generation_id=candidate_id,
reason=reason,
exc_type=type(exc).__name__,
)
if candidate_runtime is not None:
await self._cleanup_unpublished(candidate_runtime)
raise
self._next_generation_id += 1
assert candidate_runtime is not None
previous = self._current
candidate = _ProviderGeneration(
generation_id=candidate_id,
settings=settings,
runtime=candidate_runtime,
)
self._current = candidate
self._model_cache.set_available_providers(
model_cache_provider_ids_for_settings(
settings, self._connected_provider_ids()
)
)
previous.retired = True
self._retired[previous.generation_id] = previous
self._trace_published(candidate, previous=previous, reason=reason)
self._trace_retired(previous, reason=reason)
self._refresh_task = asyncio.create_task(
self._refresh_generation_in_background(candidate, only_missing=False)
)
if previous.active_leases == 0:
await self._close_generation(previous, forced=False)
return candidate.generation_id
async def close(self) -> None:
"""Reject new leases, drain existing work, and close every generation."""
async with self._close_lock:
if self._closed:
return
async with self._replace_lock:
self._closing = True
await self._cancel_refresh()
current = self._current
if not current.retired:
current.retired = True
self._retired[current.generation_id] = current
self._trace_retired(current, reason="shutdown")
generations = tuple(self._retired.values())
await asyncio.gather(
*(generation.drained.wait() for generation in generations)
)
generation_results = await asyncio.gather(
*(
self._close_generation(generation, forced=False)
for generation in generations
)
)
unpublished_closed = await self._retry_unpublished_cleanup()
if not all(generation_results) or not unpublished_closed:
raise RuntimeError("One or more provider runtimes failed to close.")
self._model_cache.clear()
self._closed = True
async def _release(self, generation: _ProviderGeneration) -> None:
if generation.active_leases <= 0:
return
generation.active_leases -= 1
if generation.active_leases != 0:
return
generation.drained.set()
if generation.retired and not self._closing:
await self._close_generation(generation, forced=False)
async def _refresh_generation(
self,
generation: _ProviderGeneration,
*,
only_missing: bool,
) -> ProviderModelRefreshResult:
if generation.closed:
return ProviderModelRefreshResult()
generation.active_leases += 1
generation.drained.clear()
try:
discovery = ProviderModelDiscovery(
generation.settings,
generation.runtime.resolve_provider,
self._model_cache,
self._connected_provider_ids(),
)
return await discovery.refresh_model_list_cache(only_missing=only_missing)
finally:
await self._release(generation)
async def _refresh_generation_in_background(
self,
generation: _ProviderGeneration,
*,
only_missing: bool,
) -> None:
try:
await self._refresh_generation(generation, only_missing=only_missing)
except asyncio.CancelledError:
raise
except Exception as exc:
logger.warning(
"Provider model discovery task failed: exc_type={}",
type(exc).__name__,
)
async def _cancel_refresh(self) -> None:
task = self._refresh_task
self._refresh_task = None
if task is None or task.done():
return
task.cancel()
await asyncio.gather(task, return_exceptions=True)
async def _cleanup_unpublished(self, runtime: ProviderRuntime) -> bool:
self._unpublished.add(runtime)
try:
await runtime.cleanup()
except asyncio.CancelledError:
raise
except Exception as exc:
logger.warning(
"Unpublished provider generation cleanup failed: exc_type={}",
type(exc).__name__,
)
return False
self._unpublished.discard(runtime)
return True
async def _retry_unpublished_cleanup(self) -> bool:
all_closed = True
for runtime in tuple(self._unpublished):
if not await self._cleanup_unpublished(runtime):
all_closed = False
return all_closed
async def _close_generation(
self,
generation: _ProviderGeneration,
*,
forced: bool,
) -> bool:
if generation.closed:
return True
if generation.active_leases != 0:
return False
task = generation.cleanup_task
if task is None:
task = asyncio.create_task(
self._run_generation_cleanup(generation, forced=forced),
name=f"provider-generation-cleanup-{generation.generation_id}",
)
generation.cleanup_task = task
return await asyncio.shield(task)
async def _run_generation_cleanup(
self,
generation: _ProviderGeneration,
*,
forced: bool,
) -> bool:
task = asyncio.current_task()
try:
try:
await generation.runtime.cleanup()
except asyncio.CancelledError:
raise
except Exception as exc:
logger.warning(
"Provider generation cleanup failed: generation_id={} exc_type={}",
generation.generation_id,
type(exc).__name__,
)
return False
generation.closed = True
self._retired.pop(generation.generation_id, None)
trace_event(
stage="runtime",
event="provider_generation.closed",
source="runtime",
generation_id=generation.generation_id,
active_leases=generation.active_leases,
forced=forced,
outcome="ok",
)
return True
finally:
if not generation.closed and generation.cleanup_task is task:
generation.cleanup_task = None
@staticmethod
def _trace_published(
generation: _ProviderGeneration,
*,
previous: _ProviderGeneration | None,
reason: str,
) -> None:
trace_event(
stage="runtime",
event="provider_generation.published",
source="runtime",
generation_id=generation.generation_id,
previous_generation_id=(
previous.generation_id if previous is not None else None
),
reason=reason,
)
@staticmethod
def _trace_retired(generation: _ProviderGeneration, *, reason: str) -> None:
trace_event(
stage="runtime",
event="provider_generation.retired",
source="runtime",
generation_id=generation.generation_id,
active_leases=generation.active_leases,
reason=reason,
)
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