Implement RAGAS metrics

agent/nodes/ragasMetrics.ts

@@ -0,0 +1,18 @@
+import { GraphNode } from "@langchain/langgraph";
+import { MessagesState } from "../state";
+import { AIMessage, HumanMessage } from "@langchain/core/messages";
+import { evaluateWithRagas } from "../tools/ragasCall";
+
+export const ragasMetrics: GraphNode<typeof MessagesState> = async (state) => {
+  const question = "A possible trigger event for: " + state.disinformationTitle //Should it be raw, or normalized?
+  const answer = state.proposedTriggerEvent[state.proposedTriggerEventIndex].Event
+  const contexts = state.proposedTriggerEvent[state.proposedTriggerEventIndex].context?.split("^^^") ?? []
+  
+  console.log(contexts)
+  
+  const results = await evaluateWithRagas({question, answer, contexts})
+  
+  return {
+    messages: [ new AIMessage("RAGAS:" + results.faithfulness)]
+  };
+};