89 lines
3.1 KiB
TypeScript
89 lines
3.1 KiB
TypeScript
import u from "@/utils";
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import { generateText, streamText, Output, stepCountIs, ModelMessage, LanguageModel, Tool, GenerateTextResult } from "ai";
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import { parse } from "best-effort-json-parser";
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import modelList from "./modelList";
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import { z } from "zod";
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interface AIInput<T extends Record<string, z.ZodTypeAny> | undefined = undefined> {
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system?: string;
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tools?: Record<string, Tool>;
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maxStep?: number;
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output?: T;
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prompt?: string;
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messages?: Array<ModelMessage>;
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}
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interface AIConfig {
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model?: string;
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apiKey?: string;
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baseURL?: string;
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}
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const buildOptions = async (input: AIInput<any>, config: AIConfig) => {
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const sqlTextModelConfig = await u.getConfig("text");
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const { model, apiKey, baseURL } = { ...sqlTextModelConfig, ...config };
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const owned = modelList.find((m) => m.model === model);
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if (!owned) throw new Error("不支持的模型或厂商");
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const modelInstance = owned.instance({ apiKey, baseURL });
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const maxStep = input.maxStep ?? (input.tools ? Object.keys(input.tools).length * 5 : undefined);
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const outputBuilders: Record<string, (schema: any) => any> = {
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schema: (s) => Output.object({ schema: z.object(s) }),
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object: () => {
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const jsonSchemaPrompt = `\n请按照以下 JSON Schema 格式返回结果:\n${JSON.stringify(
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z.toJSONSchema(z.object(input.output)),
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null,
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2,
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)}\n只返回结果，不要将Schema返回。`;
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input.system = (input.system ?? "") + jsonSchemaPrompt;
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// return Output.json();
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},
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};
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const output = input.output ? outputBuilders[owned.responseFormat]?.(input.output) ?? null : null;
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return {
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config: {
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model: modelInstance(model) as LanguageModel,
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...(input.system && { system: input.system }),
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...(input.prompt ? { prompt: input.prompt } : { messages: input.messages! }),
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...(input.tools && owned.tool && { tools: input.tools }),
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...(maxStep && { stopWhen: stepCountIs(maxStep) }),
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...(output && { output }),
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},
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responseFormat: owned.responseFormat,
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};
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};
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type InferOutput<T> = T extends Record<string, z.ZodTypeAny> ? z.infer<z.ZodObject<T>> : GenerateTextResult<Record<string, Tool>, never>;
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const ai = Object.create({}) as {
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invoke<T extends Record<string, z.ZodTypeAny> | undefined = undefined>(input: AIInput<T>, config?: AIConfig): Promise<InferOutput<T>>;
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stream(input: AIInput, config?: AIConfig): Promise<ReturnType<typeof streamText>>;
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};
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ai.invoke = async (input: AIInput<any>, config: AIConfig = {}) => {
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const options = await buildOptions(input, config);
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const result = await generateText(options.config);
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if (options.responseFormat === "object" && input.output) {
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const pattern = /{[^{}]*}|{(?:[^{}]*|{[^{}]*})*}/g;
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const jsonLikeTexts = Array.from(result.text.matchAll(pattern), (m) => m[0]);
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const res = jsonLikeTexts.map((jsonText) => parse(jsonText));
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return res[0];
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}
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if (options.responseFormat === "schema" && input.output) {
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return JSON.parse(result.text);
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}
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return result;
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};
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ai.stream = async (input: AIInput, config: AIConfig = {}) => {
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const options = await buildOptions(input, config);
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return streamText(options.config);
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};
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export default ai;
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