351 lines
11 KiB
TypeScript
351 lines
11 KiB
TypeScript
import type {
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GenerationProvider,
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GenerationRequest,
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} from "@wrnexus/design-studio";
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export const APIMART_MODEL = "gpt-6-luna";
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export const AI_TIMEOUT_MS = 60_000;
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export const AI_OUTPUT_TOKENS = 8192;
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type FailureKind =
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| "auth"
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| "quota"
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| "model"
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| "rate"
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| "unavailable"
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| "network"
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| "truncated"
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| "filtered"
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| "response"
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| "request";
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const failureMessages: Record<FailureKind, string> = {
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auth: "APIMart rejected the server API key. Check APIMART_API_KEY and its permissions, then restart the app.",
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quota:
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"APIMart reports insufficient credit or quota. Check the provider account balance and limits.",
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model:
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"APIMart could not access gpt-6-luna. Check that this model is enabled for the server API key.",
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rate: "APIMart is rate limiting requests. Wait a minute and generate again.",
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unavailable:
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"APIMart is temporarily unavailable. Try generating again shortly.",
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network:
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"The server could not reach APIMart. Check the VM's outbound HTTPS connection and try again.",
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truncated:
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"APIMart stopped before completing all design alternatives. Try a shorter brief or generate again.",
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filtered: "APIMart declined this generation. Revise the brief and try again.",
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response:
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"APIMart returned an empty or unreadable completion. Try generating again.",
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request:
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"APIMart rejected the completion request. Check the provider's model configuration.",
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};
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class APIMartFailure extends Error {
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constructor(
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readonly kind: FailureKind,
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readonly status?: number,
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) {
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super(failureMessages[kind]);
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}
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get retryable() {
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return ["rate", "unavailable", "network", "truncated", "response"].includes(
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this.kind,
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);
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}
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}
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function failureFor(status: number, code?: unknown) {
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// Only recognized codes influence the category; upstream text never leaves this adapter.
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const known = typeof code === "string" ? code.toLowerCase() : "";
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const kind: FailureKind =
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status === 401 || status === 403 || known === "invalid_api_key"
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? "auth"
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: status === 402 ||
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["insufficient_quota", "insufficient_balance"].includes(known)
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? "quota"
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: status === 404 || known === "model_not_found"
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? "model"
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: status === 429 || known === "rate_limit_exceeded"
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? "rate"
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: status >= 500
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? "unavailable"
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: "request";
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return new APIMartFailure(kind, status);
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}
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export function apimartProvider(
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apiKey: string,
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transport: typeof fetch = fetch,
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): GenerationProvider {
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return {
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name: "APIMart",
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async generate(prompt, options = {}) {
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let response: Response;
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try {
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response = await transport(
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"https://api.apimart.ai/v1/chat/completions",
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{
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method: "POST",
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signal: options.signal,
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redirect: "error",
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headers: {
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authorization: `Bearer ${apiKey}`,
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"content-type": "application/json",
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},
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body: JSON.stringify({
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model: APIMART_MODEL,
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stream: false,
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max_tokens: options.maxTokens ?? AI_OUTPUT_TOKENS,
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messages: [
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{
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role: "system",
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content:
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options.system ?? "Return valid design proposal JSON only.",
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},
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{ role: "user", content: prompt },
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],
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}),
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},
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);
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} catch {
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options.signal?.throwIfAborted();
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throw new APIMartFailure("network");
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}
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// Never forward upstream bodies: they may echo credentials or submitted context.
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if (!response.ok) {
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// Read a bounded envelope only to recognize documented machine codes.
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let code: unknown;
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try {
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code = JSON.parse(await readBounded(response, 200_000)).error?.code;
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} catch {
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/* Ignore raw error text. */
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}
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throw failureFor(response.status, code);
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}
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let result;
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try {
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result = JSON.parse(await readBounded(response, 200_000));
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} catch {
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options.signal?.throwIfAborted();
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throw new APIMartFailure("response");
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}
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if (result?.error) throw failureFor(400, result.error.code);
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const choice = result?.choices?.[0];
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if (choice?.finish_reason === "length")
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throw new APIMartFailure("truncated");
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if (choice?.finish_reason === "content_filter")
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throw new APIMartFailure("filtered");
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if (
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typeof choice?.message?.content !== "string" ||
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!choice.message.content.trim()
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)
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throw new APIMartFailure("response");
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return {
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value: choice.message.content,
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provider: "APIMart",
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model: APIMART_MODEL,
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};
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},
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};
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}
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async function readBounded(source: Request | Response, limit: number) {
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const reader = source.body?.getReader();
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const decoder = new TextDecoder();
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let text = "",
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bytes = 0;
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if (!reader) return text;
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try {
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while (true) {
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const chunk = await reader.read();
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if (chunk.done) break;
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bytes += chunk.value.byteLength;
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if (bytes > limit) {
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await reader.cancel();
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throw Error("Request or response is too large.");
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}
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text += decoder.decode(chunk.value, { stream: true });
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}
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return text + decoder.decode();
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} finally {
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reader.releaseLock();
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}
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}
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export function studioAI(apiKey?: string, transport: typeof fetch = fetch) {
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let active = 0,
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windowStart = Date.now(),
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count = 0;
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const json = (value: unknown, status = 200) =>
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new Response(JSON.stringify(value), {
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status,
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headers: {
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"content-type": "application/json",
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"cache-control": "no-store",
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},
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});
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return async (request: Request): Promise<Response | undefined> => {
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const url = new URL(request.url);
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if (
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!apiKey ||
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![
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"/design-studio/api/generation",
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"/design-studio/api/generate",
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].includes(url.pathname)
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)
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return;
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const scheme = request.headers.get("x-forwarded-proto");
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if (scheme === "https" || scheme === "http") url.protocol = scheme + ":";
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if (
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request.headers.get("origin") &&
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request.headers.get("origin") !== url.origin
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)
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return json({ error: "Same-origin requests only." }, 403);
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if (url.pathname.endsWith("/generation") && request.method === "GET")
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return json({
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provider: "APIMart",
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model: APIMART_MODEL,
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templateVersion: 1,
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maxAttempts: 2,
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maxOutputTokens: AI_OUTPUT_TOKENS,
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timeoutMs: AI_TIMEOUT_MS,
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});
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if (!url.pathname.endsWith("/generate") || request.method !== "POST")
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return json({ error: "Method not allowed." }, 405);
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if (
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!(request.headers.get("content-type") ?? "").startsWith(
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"application/json",
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)
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)
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return json({ error: "JSON required." }, 415);
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if (Date.now() - windowStart >= 60000) {
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windowStart = Date.now();
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count = 0;
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}
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if (active >= 2 || count >= 10)
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return json(
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{ error: "AI generation is busy. Try again in a minute." },
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429,
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);
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active++;
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try {
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const input = JSON.parse(
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await readBounded(request, 2_000_000),
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) as GenerationRequest;
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count++;
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// Preserve the installed engine's validation, locks, revision checks and repair budget.
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const module = import.meta.resolve("@wrnexus/design-studio");
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const { generateDesigns } = (await import(
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module
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)) as typeof import("@wrnexus/design-studio");
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let calls = 0;
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let exhausted = false;
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let failure: APIMartFailure | undefined;
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const upstream = apimartProvider(apiKey, transport);
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const provider: GenerationProvider = {
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name: upstream.name,
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async generate(prompt, options) {
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// The repair pass and transport retry share one two-call budget.
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if (calls >= 2) {
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exhausted = true;
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throw failure ?? new APIMartFailure("response");
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}
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calls++;
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failure = undefined;
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try {
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return await upstream.generate(prompt, options);
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} catch (error) {
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options?.signal?.throwIfAborted();
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failure =
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error instanceof APIMartFailure
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? error
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: new APIMartFailure("response");
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throw failure;
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}
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},
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};
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const deadline = AbortSignal.any([
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request.signal,
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AbortSignal.timeout(AI_TIMEOUT_MS),
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]);
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const generate = () =>
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generateDesigns(input, {
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provider,
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model: APIMART_MODEL,
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signal: deadline,
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timeoutMs: AI_TIMEOUT_MS,
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maxOutputTokens: AI_OUTPUT_TOKENS,
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});
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let result = await generate();
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if (
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!result.alternatives.length &&
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failure?.retryable &&
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calls < 2 &&
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!deadline.aborted
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)
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result = await generate();
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result.provenance.attempts = calls;
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if (exhausted && !failure && !result.alternatives.length) {
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result.diagnostics = [
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{
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code: "WRN-STUDIO-PROPOSAL",
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path: "$",
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message:
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"APIMart returned a design that did not meet the schema after both provider requests were used. Generate again. Your draft and previous alternatives are unchanged.",
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},
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];
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}
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if (
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failure &&
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result.diagnostics.some((d) => d.code === "WRN-STUDIO-PROVIDER")
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) {
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const reference = crypto.randomUUID();
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console.warn(
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JSON.stringify({
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event: "studio-ai-provider-failure",
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reference,
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category: failure.kind,
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status: failure.status,
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attempts: calls,
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}),
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);
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result.diagnostics = [
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{
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code: "WRN-STUDIO-PROVIDER",
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path: "$",
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message: `${failure.message} Your draft and previous alternatives are unchanged. Reference: ${reference}`,
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},
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];
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}
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return json(result);
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} catch (error) {
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const message =
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error instanceof Error ? error.message : "Invalid generation request.";
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if (message.includes("WRN-STUDIO-CONFLICT"))
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return json(
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{
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error: "Your draft changed. Generate again from the current draft.",
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},
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409,
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);
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if (message.includes("too large"))
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return json({ error: "Request is too large." }, 413);
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if (
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request.signal.aborted ||
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(error instanceof Error &&
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["AbortError", "TimeoutError"].includes(error.name))
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)
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return json(
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{
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error:
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"AI generation timed out or was cancelled. Your draft is unchanged.",
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},
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408,
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);
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return json(
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{
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error:
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"Could not generate a design. Check the brief and server AI configuration. Your draft is unchanged.",
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},
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400,
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);
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} finally {
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active--;
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}
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};
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}
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