Prep for more model providers

Adds a `modelProvider` field to `promptVariants`, currently just set to "openai/ChatCompletion" for all variants for now.

Adds a `modelProviders/` directory where we can define and store pluggable model providers. Currently just OpenAI. Not everything is pluggable yet -- notably the code to actually generate completions hasn't been migrated to this setup yet.

Does a lot of work to get the types working. Prompts are now defined with a function `definePrompt(modelProvider, config)` instead of `prompt = config`. Added a script to migrate old prompt definitions.

This is still partial work, but the diff is large enough that I want to get it in. I don't think anything is broken but I haven't tested thoroughly.

src/server/utils/generateNewCell.ts

@@ -1,8 +1,9 @@
-import crypto from "crypto";
 import { type Prisma } from "@prisma/client";
 import { prisma } from "../db";
 import { queueLLMRetrievalTask } from "./queueLLMRetrievalTask";
-import { constructPrompt } from "./constructPrompt";
+import parseConstructFn from "./parseConstructFn";
+import { type JsonObject } from "type-fest";
+import hashPrompt from "./hashPrompt";
 
 export const generateNewCell = async (variantId: string, scenarioId: string) => {
   const variant = await prisma.promptVariant.findUnique({
@@ -19,10 +20,6 @@ export const generateNewCell = async (variantId: string, scenarioId: string) =>
 
   if (!variant || !scenario) return null;
 
-  const prompt = await constructPrompt(variant, scenario.variableValues);
-
-  const inputHash = crypto.createHash("sha256").update(JSON.stringify(prompt)).digest("hex");
-
   let cell = await prisma.scenarioVariantCell.findUnique({
     where: {
       promptVariantId_testScenarioId: {
@@ -37,10 +34,29 @@ export const generateNewCell = async (variantId: string, scenarioId: string) =>
 
   if (cell) return cell;
 
+  const parsedConstructFn = await parseConstructFn(
+    variant.constructFn,
+    scenario.variableValues as JsonObject,
+  );
+
+  if ("error" in parsedConstructFn) {
+    return await prisma.scenarioVariantCell.create({
+      data: {
+        promptVariantId: variantId,
+        testScenarioId: scenarioId,
+        statusCode: 400,
+        errorMessage: parsedConstructFn.error,
+      },
+    });
+  }
+
+  const inputHash = hashPrompt(parsedConstructFn);
+
   cell = await prisma.scenarioVariantCell.create({
     data: {
       promptVariantId: variantId,
       testScenarioId: scenarioId,
+      prompt: parsedConstructFn.modelInput as unknown as Prisma.InputJsonValue,
     },
     include: {
       modelOutput: true,
@@ -48,9 +64,7 @@ export const generateNewCell = async (variantId: string, scenarioId: string) =>
   });
 
   const matchingModelOutput = await prisma.modelOutput.findFirst({
-    where: {
-      inputHash,
-    },
+    where: { inputHash },
   });
 
   let newModelOutput;