Handle unregistered function calls

Errors from model function calling should propagate up instead of being catched there.

src/execution.ts

@@ -260,12 +260,10 @@ async function executeFromQueue(channel: string) {
       // handle function calls
       if (generatedMessage.function_call) {
         OpenAImessages.push(generatedMessage);
-        OpenAImessages.push({
-          role: "function",
-          name: generatedMessage.function_call.name,
         // FIXME: don't use new instance of FunctionManager
-          content: new FunctionManager().handleFunction(generatedMessage.function_call),
-        });
+        OpenAImessages.push(
+          new FunctionManager().handleFunction(generatedMessage.function_call)
+        );
       }
     } while (generatedMessage.function_call);
 

src/funcitonManager.ts

@@ -1,4 +1,5 @@
-import { ChatCompletionFunctions, ChatCompletionRequestMessageFunctionCall } from "openai";
+import { ChatCompletionFunctions, ChatCompletionRequestMessage, ChatCompletionRequestMessageFunctionCall } from "openai";
+
 import config from "./config";
 
 type parameterMap = {
@@ -60,15 +61,32 @@ export default class FunctionManager {
     return rvalue;
   }
 
-  public handleFunction(request: ChatCompletionRequestMessageFunctionCall) {
+  public handleFunction(request: ChatCompletionRequestMessageFunctionCall): ChatCompletionRequestMessage {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    let parsedArguments: any;
+    
+    const functionToRun = this.store.get(request.name ?? "");
+
+    // check if the function is registered
+    if (!functionToRun) {
+      return {
+        role: "system",
+        content: "Only use functions that were provided to you",
+      };
+    }
+
     try {
-      const parsedArguments = JSON.parse(request.arguments ?? "");
-      return this.store.get(request.name ?? "")?.execute(parsedArguments);
+      parsedArguments = JSON.parse(request.arguments ?? "");
     }
     catch (e) {
       console.error("Function arguments raw: " + request.arguments);
       throw new Error(`Failed to parse the function JSON arguments when running function [${request.name}]`, {cause: e});
     }
+    return {
+      role: "function",
+      name: request.name,
+      content: functionToRun.execute(parsedArguments),
+    };
   }
 }