Initial commit

core/metrics.py

@@ -0,0 +1,72 @@
+from collections import defaultdict
+from typing import Any, Optional
+from datetime import datetime
+from core.events import bus, Event
+
+
+class CXMetrics:
+    def __init__(self):
+        self.counters = defaultdict(int)
+        self.events: list[dict[str, Any]] = []
+        self.max_events = 5000
+
+        # attach to event bus
+        bus.subscribe(self._on_event)
+
+    # -------------------------
+    # EVENT HOOK
+    # -------------------------
+
+    def _on_event(self, event: Event):
+        self.counters[f"event_{event.name}"] += 1
+        self.counters[f"level_{event.level}"] += 1
+
+        self.events.append({
+            "name": event.name,
+            "source": event.source,
+            "level": event.level,
+            "data": event.data,
+            "timestamp": event.timestamp
+        })
+
+        if len(self.events) > self.max_events:
+            self.events = self.events[-self.max_events:]
+
+    # -------------------------
+    # MANUAL COUNTERS
+    # -------------------------
+
+    def inc(self, key: str, value: int = 1):
+        self.counters[key] += value
+
+    def event(self, name: str, data: Optional[dict] = None):
+        bus.emit(Event(
+            name=name,
+            source="metrics",
+            level="INFO",
+            data=data or {}
+        ))
+
+    # -------------------------
+    # SNAPSHOT (Prometheus / API)
+    # -------------------------
+
+    def snapshot(self) -> dict:
+        return {
+            "counters": dict(self.counters),
+            "recent_events": self.events[-100:],
+            "timestamp": datetime.utcnow().isoformat()
+        }
+
+    # -------------------------
+    # SIMPLE EXPORT FORMAT (future Prometheus hook)
+    # -------------------------
+
+    def prometheus_format(self) -> str:
+        lines = []
+        for k, v in self.counters.items():
+            lines.append(f"{k} {v}")
+        return "\n".join(lines)
+
+
+metrics = CXMetrics()