feat(ai): add Models runtime with provider-owned auth (phase 1)

New Models/MutableModels/createModels collection: provider map, async model listing (best-effort aggregation), getAuth decision tree with double-checked locked OAuth refresh, stream/complete with per-field auth merge over lazyStream. Auth substrate: ProviderAuth { apiKey?, oauth? }, one type-tagged credential per provider, CredentialStore (read/modify/delete; modify is the only write path, serialized RMW), OAuthAuth login/refresh/toAuth split, prompt()/notify() login callbacks, browser-safe default AuthContext. types.ts: Provider alias renamed to ProviderId; ApiOptionsMap and ApiStreamOptions<TApi> for typed per-API stream options; hasApi() runtime narrowing guard.
2026-06-10 18:49:10 +02:00
parent 7498b216d9
commit f63095cfff
10 changed files with 1427 additions and 92 deletions
@@ -0,0 +1,56 @@
+import type { Api, AssistantMessage, AssistantMessageEvent, Model } from "../types.ts";
+import { AssistantMessageEventStream } from "../utils/event-stream.ts";
+
+function createSetupErrorMessage(model: Model<Api>, error: unknown): AssistantMessage {
+	return {
+		role: "assistant",
+		content: [],
+		api: model.api,
+		provider: model.provider,
+		model: model.id,
+		usage: {
+			input: 0,
+			output: 0,
+			cacheRead: 0,
+			cacheWrite: 0,
+			totalTokens: 0,
+			cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+		},
+		stopReason: "error",
+		errorMessage: error instanceof Error ? error.message : String(error),
+		timestamp: Date.now(),
+	};
+}
+
+function forwardStream(target: AssistantMessageEventStream, source: AsyncIterable<AssistantMessageEvent>): void {
+	(async () => {
+		for await (const event of source) {
+			target.push(event);
+		}
+		target.end();
+	})();
+}
+
+/**
+ * Returns a stream synchronously while running async setup (auth resolution,
+ * lazy module loading) behind it. Setup failures terminate the stream with an
+ * error event.
+ */
+export function lazyStream(
+	model: Model<Api>,
+	setup: () => Promise<AsyncIterable<AssistantMessageEvent>>,
+): AssistantMessageEventStream {
+	const outer = new AssistantMessageEventStream();
+
+	setup()
+		.then((inner) => {
+			forwardStream(outer, inner);
+		})
+		.catch((error) => {
+			const message = createSetupErrorMessage(model, error);
+			outer.push({ type: "error", reason: "error", error: message });
+			outer.end(message);
+		});
+
+	return outer;
+}