Initial commit: Gold Trading Simulator with AI-powered analysis

2025-11-16 00:50:04 +02:00
commit 72c1d3adb7
128 changed files with 16232 additions and 0 deletions
@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import time
+from typing import Any, Dict, Tuple, Optional
+
+
+class TTLCache:
+    """Simple in-memory TTL cache (per-process). Not thread-safe, but adequate for single-UVicorn worker.
+    Keys are arbitrary hashables. Values are any JSON-serializable structures.
+    """
+
+    def __init__(self, default_ttl: int = 60, maxsize: int = 256) -> None:
+        self.default_ttl = default_ttl
+        self.maxsize = maxsize
+        self._data: Dict[Any, Tuple[float, Any]] = {}
+
+    def _now(self) -> float:
+        return time.time()
+
+    def get(self, key: Any) -> Optional[Any]:
+        item = self._data.get(key)
+        if not item:
+            return None
+        expires_at, value = item
+        if expires_at < self._now():
+            # expired
+            self._data.pop(key, None)
+            return None
+        return value
+
+    def set(self, key: Any, value: Any, ttl: Optional[int] = None) -> None:
+        if len(self._data) >= self.maxsize:
+            # naive eviction: remove oldest item
+            try:
+                oldest_key = min(self._data.items(), key=lambda kv: kv[1][0])[0]
+                self._data.pop(oldest_key, None)
+            except ValueError:
+                self._data.clear()
+        expires = self._now() + (ttl if ttl is not None else self.default_ttl)
+        self._data[key] = (expires, value)
+
+    def purge(self) -> None:
+        now = self._now()
+        for k, (exp, _) in list(self._data.items()):
+            if exp < now:
+                self._data.pop(k, None)