74 lines
2.2 KiB
TypeScript
74 lines
2.2 KiB
TypeScript
import { resolveRemoteEmbeddingBearerClient } from "./embeddings-remote-client.js";
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import { fetchRemoteEmbeddingVectors } from "./embeddings-remote-fetch.js";
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import type { EmbeddingProvider, EmbeddingProviderOptions } from "./embeddings.js";
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export type OpenAiEmbeddingClient = {
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baseUrl: string;
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headers: Record<string, string>;
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model: string;
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};
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export const DEFAULT_OPENAI_EMBEDDING_MODEL = "text-embedding-3-small";
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const DEFAULT_OPENAI_BASE_URL = "https://api.openai.com/v1";
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const OPENAI_MAX_INPUT_TOKENS: Record<string, number> = {
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"text-embedding-3-small": 8192,
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"text-embedding-3-large": 8192,
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"text-embedding-ada-002": 8191,
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};
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export function normalizeOpenAiModel(model: string): string {
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const trimmed = model.trim();
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if (!trimmed) {
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return DEFAULT_OPENAI_EMBEDDING_MODEL;
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}
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if (trimmed.startsWith("openai/")) {
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return trimmed.slice("openai/".length);
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}
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return trimmed;
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}
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export async function createOpenAiEmbeddingProvider(
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options: EmbeddingProviderOptions,
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): Promise<{ provider: EmbeddingProvider; client: OpenAiEmbeddingClient }> {
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const client = await resolveOpenAiEmbeddingClient(options);
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const url = `${client.baseUrl.replace(/\/$/, "")}/embeddings`;
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const embed = async (input: string[]): Promise<number[][]> => {
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if (input.length === 0) {
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return [];
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}
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return await fetchRemoteEmbeddingVectors({
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url,
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headers: client.headers,
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body: { model: client.model, input },
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errorPrefix: "openai embeddings failed",
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});
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};
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return {
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provider: {
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id: "openai",
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model: client.model,
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maxInputTokens: OPENAI_MAX_INPUT_TOKENS[client.model],
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embedQuery: async (text) => {
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const [vec] = await embed([text]);
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return vec ?? [];
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},
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embedBatch: embed,
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},
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client,
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};
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}
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export async function resolveOpenAiEmbeddingClient(
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options: EmbeddingProviderOptions,
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): Promise<OpenAiEmbeddingClient> {
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const { baseUrl, headers } = await resolveRemoteEmbeddingBearerClient({
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provider: "openai",
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options,
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defaultBaseUrl: DEFAULT_OPENAI_BASE_URL,
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});
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const model = normalizeOpenAiModel(options.model);
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return { baseUrl, headers, model };
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}
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