1 files changed, 54 insertions, 0 deletions
diff --git a/services/strategy-engine/src/strategy_engine/engine.py b/services/strategy-engine/src/strategy_engine/engine.py
new file mode 100644
index 0000000..09dbf65
--- /dev/null
+++ b/services/strategy-engine/src/strategy_engine/engine.py
@@ -0,0 +1,54 @@
+"""Strategy Engine: consumes candle events and publishes signals."""
+import logging
+
+from shared.broker import RedisBroker
+from shared.events import CandleEvent, SignalEvent, Event
+
+from strategies.base import BaseStrategy
+
+logger = logging.getLogger(__name__)
+
+
+class StrategyEngine:
+    def __init__(self, broker: RedisBroker, strategies: list[BaseStrategy]) -> None:
+        self._broker = broker
+        self._strategies = strategies
+
+    async def process_once(self, stream: str, last_id: str) -> str:
+        """Read one batch of messages from the stream, process candles, publish signals.
+
+        Returns the updated last_id for the next call.
+        """
+        messages = await self._broker.read(stream, last_id=last_id, count=10, block=100)
+
+        for raw in messages:
+            try:
+                event = Event.from_dict(raw)
+            except Exception as exc:
+                logger.warning("Failed to parse event: %s – %s", raw, exc)
+                continue
+
+            if not isinstance(event, CandleEvent):
+                continue
+
+            candle = event.data
+            for strategy in self._strategies:
+                try:
+                    signal = strategy.on_candle(candle)
+                except Exception as exc:
+                    logger.error(
+                        "Strategy %s raised on candle: %s", strategy.name, exc
+                    )
+                    continue
+
+                if signal is not None:
+                    signal_event = SignalEvent(data=signal)
+                    await self._broker.publish("signals", signal_event.to_dict())
+                    logger.info(
+                        "Signal published: strategy=%s symbol=%s side=%s",
+                        signal.strategy,
+                        signal.symbol,
+                        signal.side,
+                    )
+
+        return last_id