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from __future__ import annotations
import threading
class _HTTP2ProbeCache:
__slots__ = (
"_lock",
"_cache_locks",
"_cache_values",
)
def __init__(self) -> None:
self._lock = threading.Lock()
self._cache_locks: dict[tuple[str, int], threading.RLock] = {}
self._cache_values: dict[tuple[str, int], bool | None] = {}
def acquire_and_get(self, host: str, port: int) -> bool | None:
# By the end of this block we know that
# _cache_[values,locks] is available.
value = None
with self._lock:
key = (host, port)
try:
value = self._cache_values[key]
# If it's a known value we return right away.
if value is not None:
return value
except KeyError:
self._cache_locks[key] = threading.RLock()
self._cache_values[key] = None
# If the value is unknown, we acquire the lock to signal
# to the requesting thread that the probe is in progress
# or that the current thread needs to return their findings.
key_lock = self._cache_locks[key]
key_lock.acquire()
try:
# If the by the time we get the lock the value has been
# updated we want to return the updated value.
value = self._cache_values[key]
# In case an exception like KeyboardInterrupt is raised here.
except BaseException as e: # Defensive:
assert not isinstance(e, KeyError) # KeyError shouldn't be possible.
key_lock.release()
raise
return value
def set_and_release(
self, host: str, port: int, supports_http2: bool | None
) -> None:
key = (host, port)
key_lock = self._cache_locks[key]
with key_lock: # Uses an RLock, so can be locked again from same thread.
if supports_http2 is None and self._cache_values[key] is not None:
raise ValueError(
"Cannot reset HTTP/2 support for origin after value has been set."
) # Defensive: not expected in normal usage
self._cache_values[key] = supports_http2
key_lock.release()
def _values(self) -> dict[tuple[str, int], bool | None]:
"""This function is for testing purposes only. Gets the current state of the probe cache"""
with self._lock:
return {k: v for k, v in self._cache_values.items()}
def _reset(self) -> None:
"""This function is for testing purposes only. Reset the cache values"""
with self._lock:
self._cache_locks = {}
self._cache_values = {}
_HTTP2_PROBE_CACHE = _HTTP2ProbeCache()
set_and_release = _HTTP2_PROBE_CACHE.set_and_release
acquire_and_get = _HTTP2_PROBE_CACHE.acquire_and_get
_values = _HTTP2_PROBE_CACHE._values
_reset = _HTTP2_PROBE_CACHE._reset
__all__ = [
"set_and_release",
"acquire_and_get",
]