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dc03b36 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 | from __future__ import annotations
import copy
import hashlib
import json
import threading
import time
from dataclasses import dataclass, field
from typing import Any, Callable, Iterable, Iterator
from services.config import config
CACHEABLE_TEXT_KEYS = {
"frequency_penalty",
"max_completion_tokens",
"max_tokens",
"metadata",
"model",
"presence_penalty",
"reasoning_effort",
"response_format",
"seed",
"stop",
"temperature",
"tool_choice",
"tools",
"top_p",
"user",
}
@dataclass
class CacheEntry:
expires_at: float
value: Any
@dataclass
class InflightCall:
condition: threading.Condition = field(default_factory=lambda: threading.Condition(threading.RLock()))
done: bool = False
value: Any = None
error: BaseException | None = None
def _json_safe(value: Any) -> Any:
if isinstance(value, bytes):
return {"__bytes_sha256__": hashlib.sha256(value).hexdigest(), "length": len(value)}
if isinstance(value, bytearray):
data = bytes(value)
return {"__bytes_sha256__": hashlib.sha256(data).hexdigest(), "length": len(data)}
if isinstance(value, dict):
return {str(key): _json_safe(item) for key, item in value.items()}
if isinstance(value, (list, tuple)):
return [_json_safe(item) for item in value]
return value
def canonical_body(body: dict[str, Any], messages: list[dict[str, Any]], *, stream: bool) -> dict[str, Any]:
payload = {key: body.get(key) for key in CACHEABLE_TEXT_KEYS if key in body}
payload["messages"] = messages
payload["stream"] = bool(stream)
return payload
def cache_key(body: dict[str, Any], messages: list[dict[str, Any]], *, stream: bool) -> str:
encoded = json.dumps(
_json_safe(canonical_body(body, messages, stream=stream)),
ensure_ascii=False,
sort_keys=True,
separators=(",", ":"),
).encode("utf-8")
return hashlib.sha256(encoded).hexdigest()
def _message_signature(message: dict[str, Any]) -> str:
return json.dumps(_json_safe(message), ensure_ascii=False, sort_keys=True, separators=(",", ":"))
def normalize_text_messages(messages: list[dict[str, Any]]) -> list[dict[str, Any]]:
settings = config.get_chat_completion_cache_settings()
if not settings.get("normalize_messages"):
return messages
normalized: list[dict[str, Any]] = []
previous_signature = ""
for message in messages:
if settings.get("drop_assistant_history") and str(message.get("role") or "") == "assistant":
continue
signature = _message_signature(message)
if settings.get("drop_adjacent_duplicates") and signature == previous_signature:
continue
normalized.append(message)
previous_signature = signature
return normalized
class ChatCompletionCache:
def __init__(self) -> None:
self._lock = threading.RLock()
self._entries: dict[str, CacheEntry] = {}
self._inflight: dict[str, InflightCall] = {}
def clear(self) -> None:
with self._lock:
self._entries.clear()
self._inflight.clear()
def _settings(self) -> dict[str, object]:
return config.get_chat_completion_cache_settings()
def _prune_locked(self, now: float, max_entries: int) -> None:
expired = [key for key, item in self._entries.items() if item.expires_at <= now]
for key in expired:
self._entries.pop(key, None)
while len(self._entries) > max_entries:
oldest_key = min(self._entries, key=lambda key: self._entries[key].expires_at)
self._entries.pop(oldest_key, None)
@staticmethod
def _copy(value: Any) -> Any:
return copy.deepcopy(value)
def get_or_compute_response(self, key: str, compute: Callable[[], dict[str, Any]]) -> dict[str, Any]:
settings = self._settings()
if not settings.get("enabled") or int(settings.get("ttl_seconds") or 0) <= 0:
return compute()
now = time.time()
max_entries = int(settings.get("max_entries") or 1)
with self._lock:
self._prune_locked(now, max_entries)
entry = self._entries.get(key)
if entry and entry.expires_at > now:
return self._copy(entry.value)
inflight = self._inflight.get(key) if settings.get("dedupe_inflight") else None
if inflight is None:
inflight = InflightCall()
if settings.get("dedupe_inflight"):
self._inflight[key] = inflight
owner = True
else:
owner = False
if not owner:
with inflight.condition:
while not inflight.done:
inflight.condition.wait()
if inflight.error:
raise inflight.error
return self._copy(inflight.value)
try:
value = compute()
except BaseException as exc:
with self._lock:
self._inflight.pop(key, None)
with inflight.condition:
inflight.error = exc
inflight.done = True
inflight.condition.notify_all()
raise
expires_at = time.time() + int(settings.get("ttl_seconds") or 0)
with self._lock:
self._entries[key] = CacheEntry(expires_at=expires_at, value=self._copy(value))
self._prune_locked(time.time(), max_entries)
self._inflight.pop(key, None)
with inflight.condition:
inflight.value = self._copy(value)
inflight.done = True
inflight.condition.notify_all()
return value
def get_or_compute_stream(self, key: str, compute: Callable[[], Iterable[dict[str, Any]]]) -> Iterator[dict[str, Any]]:
settings = self._settings()
if (
not settings.get("enabled")
or not settings.get("stream_cache")
or int(settings.get("ttl_seconds") or 0) <= 0
):
yield from compute()
return
now = time.time()
max_entries = int(settings.get("max_entries") or 1)
with self._lock:
self._prune_locked(now, max_entries)
entry = self._entries.get(key)
if entry and entry.expires_at > now:
yield from self._copy(entry.value)
return
inflight = self._inflight.get(key) if settings.get("dedupe_inflight") else None
if inflight is None:
inflight = InflightCall()
if settings.get("dedupe_inflight"):
self._inflight[key] = inflight
owner = True
else:
owner = False
if not owner:
with inflight.condition:
while not inflight.done:
inflight.condition.wait()
if inflight.error:
raise inflight.error
yield from self._copy(inflight.value)
return
chunks: list[dict[str, Any]] = []
try:
for chunk in compute():
chunks.append(self._copy(chunk))
yield chunk
except BaseException as exc:
with self._lock:
self._inflight.pop(key, None)
with inflight.condition:
inflight.error = exc
inflight.done = True
inflight.condition.notify_all()
raise
expires_at = time.time() + int(settings.get("ttl_seconds") or 0)
with self._lock:
self._entries[key] = CacheEntry(expires_at=expires_at, value=self._copy(chunks))
self._prune_locked(time.time(), max_entries)
self._inflight.pop(key, None)
with inflight.condition:
inflight.value = self._copy(chunks)
inflight.done = True
inflight.condition.notify_all()
chat_completion_cache = ChatCompletionCache()
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