Simplify provider logic and migrate getContextWindow (#142)

src/ipc/handlers/chat_stream_handlers.ts

@@ -15,7 +15,7 @@ import { extractCodebase } from "../../utils/codebase";
 import { processFullResponseActions } from "../processors/response_processor";
 import { streamTestResponse } from "./testing_chat_handlers";
 import { getTestResponse } from "./testing_chat_handlers";
-import { getMaxTokens, getModelClient } from "../utils/get_model_client";
+import { getModelClient } from "../utils/get_model_client";
 import log from "electron-log";
 import {
   getSupabaseContext,
@@ -27,6 +27,7 @@ import * as path from "path";
 import * as os from "os";
 import * as crypto from "crypto";
 import { readFile, writeFile, unlink } from "fs/promises";
+import { getMaxTokens } from "../utils/token_utils";
 
 const logger = log.scope("chat_stream_handlers");
 
@@ -332,7 +333,7 @@ This conversation includes one or more image attachments. When the user uploads
 
         // When calling streamText, the messages need to be properly formatted for mixed content
         const { textStream } = streamText({
-          maxTokens: getMaxTokens(settings.selectedModel),
+          maxTokens: await getMaxTokens(settings.selectedModel),
           temperature: 0,
           model: modelClient,
           system: systemPrompt,

src/ipc/handlers/language_model_handlers.ts

@@ -7,6 +7,7 @@ import type {
 import { createLoggedHandler } from "./safe_handle";
 import log from "electron-log";
 import {
+  CUSTOM_PROVIDER_PREFIX,
   getLanguageModelProviders,
   getLanguageModels,
   getLanguageModelsByProviders,
@@ -66,7 +67,7 @@ export function registerLanguageModelHandlers() {
       // Insert the new provider
       await db.insert(languageModelProvidersSchema).values({
         // Make sure we will never have accidental collisions with builtin providers
-        id: "custom::" + id,
+        id: CUSTOM_PROVIDER_PREFIX + id,
         name,
         api_base_url: apiBaseUrl,
         env_var_name: envVarName || null,
@@ -297,11 +298,7 @@ export function registerLanguageModelHandlers() {
       if (provider.type === "local") {
         throw new Error("Local models cannot be fetched");
       }
-      return getLanguageModels(
+      return getLanguageModels({ providerId: params.providerId });
-        provider.type === "cloud"
-          ? { builtinProviderId: params.providerId }
-          : { customProviderId: params.providerId },
-      );
     },
   );
 

src/ipc/handlers/proposal_handlers.ts

@@ -277,7 +277,7 @@ const getProposalHandler = async (
         );
 
         const totalTokens = messagesTokenCount + codebaseTokenCount;
-        const contextWindow = Math.min(getContextWindow(), 100_000);
+        const contextWindow = Math.min(await getContextWindow(), 100_000);
         logger.log(
           `Token usage: ${totalTokens}/${contextWindow} (${
             (totalTokens / contextWindow) * 100

src/ipc/handlers/token_count_handlers.ts

@@ -88,7 +88,7 @@ export function registerTokenCountHandlers() {
         codebaseTokens,
         inputTokens,
         systemPromptTokens,
-        contextWindow: getContextWindow(),
+        contextWindow: await getContextWindow(),
       };
     },
   );

src/ipc/shared/language_model_helpers.ts

@@ -139,26 +139,16 @@ export async function getLanguageModelProviders(): Promise<
  * @param obj An object containing the providerId.
  * @returns A promise that resolves to an array of LanguageModel objects.
  */
-export async function getLanguageModels(
+export async function getLanguageModels({
-  obj:
+  providerId,
-    | {
+}: {
-        customProviderId: string;
+  providerId: string;
-        // builtinProviderId?: undefined;
+}): Promise<LanguageModel[]> {
-      }
-    | {
-        builtinProviderId: string;
-        // customProviderId?: undefined;
-      },
-): Promise<LanguageModel[]> {
   const allProviders = await getLanguageModelProviders();
-  const provider = allProviders.find(
+  const provider = allProviders.find((p) => p.id === providerId);
-    (p) =>
-      p.id === (obj as { customProviderId: string }).customProviderId ||
-      p.id === (obj as { builtinProviderId: string }).builtinProviderId,
-  );
 
   if (!provider) {
-    console.warn(`Provider with ID "${JSON.stringify(obj)}" not found.`);
+    console.warn(`Provider with ID "${providerId}" not found.`);
     return [];
   }
 
@@ -177,9 +167,9 @@ export async function getLanguageModels(
       })
       .from(languageModelsSchema)
       .where(
-        "customProviderId" in obj
+        isCustomProvider({ providerId })
-          ? eq(languageModelsSchema.customProviderId, obj.customProviderId)
+          ? eq(languageModelsSchema.customProviderId, providerId)
-          : eq(languageModelsSchema.builtinProviderId, obj.builtinProviderId),
+          : eq(languageModelsSchema.builtinProviderId, providerId),
       );
 
     customModels = customModelsDb.map((model) => ({
@@ -192,7 +182,7 @@ export async function getLanguageModels(
     }));
   } catch (error) {
     console.error(
-      `Error fetching custom models for provider "${JSON.stringify(obj)}" from DB:`,
+      `Error fetching custom models for provider "${providerId}" from DB:`,
       error,
     );
     // Continue with empty custom models array
@@ -200,7 +190,6 @@ export async function getLanguageModels(
 
   // If it's a cloud provider, also get the hardcoded models
   let hardcodedModels: LanguageModel[] = [];
-  const providerId = provider.id;
   if (provider.type === "cloud") {
     if (providerId in MODEL_OPTIONS) {
       const models = MODEL_OPTIONS[providerId as RegularModelProvider] || [];
@@ -245,11 +234,7 @@ export async function getLanguageModelsByProviders(): Promise<
   const modelPromises = providers
     .filter((p) => p.type !== "local")
     .map(async (provider) => {
-      const models = await getLanguageModels(
+      const models = await getLanguageModels({ providerId: provider.id });
-        provider.type === "cloud"
-          ? { builtinProviderId: provider.id }
-          : { customProviderId: provider.id },
-      );
       return { providerId: provider.id, models };
     });
 
@@ -264,3 +249,9 @@ export async function getLanguageModelsByProviders(): Promise<
 
   return record;
 }
+
+export function isCustomProvider({ providerId }: { providerId: string }) {
+  return providerId.startsWith(CUSTOM_PROVIDER_PREFIX);
+}
+
+export const CUSTOM_PROVIDER_PREFIX = "custom::";

src/ipc/utils/get_model_client.ts

@@ -5,7 +5,7 @@ import { createOpenRouter } from "@openrouter/ai-sdk-provider";
 import { createOllama } from "ollama-ai-provider";
 import { createOpenAICompatible } from "@ai-sdk/openai-compatible";
 import type { LargeLanguageModel, UserSettings } from "../../lib/schemas";
-import { AUTO_MODELS, MODEL_OPTIONS } from "../../constants/models";
+import { AUTO_MODELS } from "../../constants/models";
 import { getEnvVar } from "./read_env";
 import log from "electron-log";
 import { getLanguageModelProviders } from "../shared/language_model_helpers";
@@ -140,19 +140,3 @@ export async function getModelClient(
     }
   }
 }
-
-// Most models support at least 8000 output tokens so we use it as a default value.
-const DEFAULT_MAX_TOKENS = 8_000;
-
-export function getMaxTokens(model: LargeLanguageModel) {
-  if (!MODEL_OPTIONS[model.provider as keyof typeof MODEL_OPTIONS]) {
-    logger.warn(
-      `Model provider ${model.provider} not found in MODEL_OPTIONS. Using default max tokens.`,
-    );
-    return DEFAULT_MAX_TOKENS;
-  }
-  const modelOption = MODEL_OPTIONS[
-    model.provider as keyof typeof MODEL_OPTIONS
-  ].find((m) => m.name === model.name);
-  return modelOption?.maxOutputTokens || DEFAULT_MAX_TOKENS;
-}

src/ipc/utils/token_utils.ts

@@ -1,9 +1,8 @@
+import { LargeLanguageModel } from "@/lib/schemas";
 import { readSettings } from "../../main/settings";
 import { Message } from "../ipc_types";
-import { MODEL_OPTIONS } from "../../constants/models";
-import log from "electron-log";
 
-const logger = log.scope("token_utils");
+import { getLanguageModels } from "../shared/language_model_helpers";
 
 // Estimate tokens (4 characters per token)
 export const estimateTokens = (text: string): number => {
@@ -19,17 +18,26 @@ export const estimateMessagesTokens = (messages: Message[]): number => {
 
 const DEFAULT_CONTEXT_WINDOW = 128_000;
 
-export function getContextWindow() {
+export async function getContextWindow() {
   const settings = readSettings();
   const model = settings.selectedModel;
-  if (!MODEL_OPTIONS[model.provider as keyof typeof MODEL_OPTIONS]) {
+
-    logger.warn(
+  const models = await getLanguageModels({
-      `Model provider ${model.provider} not found in MODEL_OPTIONS. Using default max tokens.`,
+    providerId: model.provider,
-    );
+  });
-    return DEFAULT_CONTEXT_WINDOW;
+
-  }
+  const modelOption = models.find((m) => m.apiName === model.name);
-  const modelOption = MODEL_OPTIONS[
-    model.provider as keyof typeof MODEL_OPTIONS
-  ].find((m) => m.name === model.name);
   return modelOption?.contextWindow || DEFAULT_CONTEXT_WINDOW;
 }
+
+// Most models support at least 8000 output tokens so we use it as a default value.
+const DEFAULT_MAX_TOKENS = 8_000;
+
+export async function getMaxTokens(model: LargeLanguageModel) {
+  const models = await getLanguageModels({
+    providerId: model.provider,
+  });
+
+  const modelOption = models.find((m) => m.apiName === model.name);
+  return modelOption?.maxOutputTokens || DEFAULT_MAX_TOKENS;
+}