diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..48740cb --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +node_modules/ +dist/ +.wrangler/ +.dev.vars diff --git a/README.md b/README.md index b079ec3..c4efe49 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,44 @@ -# embed +# Embedding Service -Embedding computation service — text → vector + cache (Cloudflare Worker) \ No newline at end of file +Text → vector 计算服务,nerve knowledge 的 embedding 后端。 + +## 接口 + +``` +POST /embed +Authorization: Bearer + +{ + "texts": ["chunk 1", "chunk 2"], + "model": "text-embedding-v3" +} + +→ 200 +{ + "embeddings": [[0.012, ...], [0.056, ...]], + "model": "text-embedding-v3", + "dimensions": 1024, + "cached": [false, true] +} +``` + +## 特性 + +- **缓存**: KV 存储,key = sha256(model + text),永不过期 +- **上游**: Dashscope text-embedding-v3(可配置) +- **批量**: 单次最多 100 条 +- **鉴权**: Bearer token + +## 开发 + +```bash +pnpm install +pnpm dev # 本地开发 +pnpm deploy # 部署到 Cloudflare Workers +``` + +## 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mode 100644 index 0000000..7a469a2 --- /dev/null +++ b/src/embed.ts @@ -0,0 +1,164 @@ +import { createHash } from "./hash.js"; +import type { Env } from "./index.js"; + +const MAX_BATCH = 100; +const DEFAULT_MODEL = "text-embedding-v3"; + +type EmbedRequest = { + texts: string[]; + model?: string; +}; + +type DashscopeResponse = { + output?: { + embeddings?: Array<{ + embedding: number[]; + text_index: number; + }>; + }; + usage?: { + total_tokens: number; + }; +}; + +export async function handleEmbed(request: Request, env: Env): Promise { + let body: EmbedRequest; + try { + body = (await request.json()) as EmbedRequest; + } catch { + return jsonError("Invalid JSON body", 400); + } + + if (!Array.isArray(body.texts) || body.texts.length === 0) { + return jsonError("'texts' must be a non-empty array of strings", 400); + } + + if (body.texts.length > MAX_BATCH) { + return jsonError(`Batch size ${body.texts.length} exceeds limit of ${MAX_BATCH}`, 400); + } + + for (let i = 0; i < body.texts.length; i++) { + if (typeof body.texts[i] !== "string" || body.texts[i]!.length === 0) { + return jsonError(`texts[${i}] must be a non-empty string`, 400); + } + } + + const model = body.model ?? env.DEFAULT_MODEL ?? DEFAULT_MODEL; + + // Check cache for each text + const cacheKeys: string[] = []; + const cached: Array = []; + const uncachedIndices: number[] = []; + + for (let i = 0; i < body.texts.length; i++) { + const text = body.texts[i]!; + const key = await cacheKey(model, text); + cacheKeys.push(key); + + const hit = await env.EMBED_CACHE.get(key, "text"); + if (hit !== null) { + cached.push(JSON.parse(hit) as number[]); + } else { + cached.push(null); + uncachedIndices.push(i); + } + } + + // Call Dashscope for uncached texts + if (uncachedIndices.length > 0) { + const uncachedTexts = uncachedIndices.map((i) => body.texts[i]!); + const embeddings = await callDashscope(env.DASHSCOPE_API_KEY, model, uncachedTexts); + + if (embeddings === null) { + return jsonError("Upstream embedding provider failed", 502); + } + + if (embeddings.length !== uncachedTexts.length) { + return jsonError("Upstream returned mismatched embedding count", 502); + } + + // Store in cache and fill results + const putPromises: Promise[] = []; + for (let j = 0; j < uncachedIndices.length; j++) { + const idx = uncachedIndices[j]!; + const vec = embeddings[j]!; + cached[idx] = vec; + putPromises.push(env.EMBED_CACHE.put(cacheKeys[idx]!, JSON.stringify(vec))); + } + await Promise.all(putPromises); + } + + const dimensions = cached[0]?.length ?? 0; + + return new Response( + JSON.stringify({ + embeddings: cached, + model, + dimensions, + cached: cacheKeys.map((_, i) => !uncachedIndices.includes(i)), + }), + { + status: 200, + headers: { + "Content-Type": "application/json", + "Access-Control-Allow-Origin": "*", + }, + }, + ); +} + +async function cacheKey(model: string, text: string): Promise { + const input = `${model}\0${text}`; + const hash = await createHash(input); + return `emb:${model}:${hash}`; +} + +async function callDashscope( + apiKey: string, + model: string, + texts: string[], +): Promise { + const url = "https://dashscope.aliyuncs.com/api/v1/services/embeddings/text-embedding/text-embedding"; + + const resp = await fetch(url, { + method: "POST", + headers: { + Authorization: `Bearer ${apiKey}`, + "Content-Type": "application/json", + }, + body: JSON.stringify({ + model, + input: { texts }, + parameters: { + text_type: "document", + }, + }), + }); + + if (!resp.ok) { + console.error(`Dashscope error: ${resp.status} ${await resp.text()}`); + return null; + } + + const data = (await resp.json()) as DashscopeResponse; + const rawEmbeddings = data.output?.embeddings; + + if (!rawEmbeddings || rawEmbeddings.length === 0) { + console.error("Dashscope returned no embeddings", JSON.stringify(data)); + return null; + } + + // Sort by text_index to maintain input order + const sorted = [...rawEmbeddings].sort((a, b) => a.text_index - b.text_index); + return sorted.map((e) => e.embedding); +} + +function jsonError(message: string, status: number): Response { + return new Response(JSON.stringify({ error: message }), { + status, + headers: { + "Content-Type": "application/json", + "Access-Control-Allow-Origin": "*", + }, + }); +} diff --git a/src/hash.ts b/src/hash.ts new file mode 100644 index 0000000..1d13814 --- /dev/null +++ b/src/hash.ts @@ -0,0 +1,10 @@ +/** + * SHA-256 hash using Web Crypto API (available in Workers runtime). + */ +export async function createHash(input: string): Promise { + const encoder = new TextEncoder(); + const data = encoder.encode(input); + const hashBuffer = await crypto.subtle.digest("SHA-256", data); + const hashArray = Array.from(new Uint8Array(hashBuffer)); + return hashArray.map((b) => b.toString(16).padStart(2, "0")).join(""); +} diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..93ce7f5 --- /dev/null +++ b/src/index.ts @@ -0,0 +1,56 @@ +/// + +export interface Env { + EMBED_CACHE: KVNamespace; + /** Bearer token for authentication */ + AUTH_TOKEN: string; + /** Dashscope API key */ + DASHSCOPE_API_KEY: string; + /** Default embedding model */ + DEFAULT_MODEL?: string; +} + +import { handleEmbed } from "./embed.js"; + +export default { + async fetch(request: Request, env: Env): Promise { + // CORS preflight + if (request.method === "OPTIONS") { + return new Response(null, { + headers: { + "Access-Control-Allow-Origin": "*", + "Access-Control-Allow-Methods": "POST, OPTIONS", + "Access-Control-Allow-Headers": "Authorization, Content-Type", + }, + }); + } + + // Auth check + const authHeader = request.headers.get("Authorization"); + if (!authHeader || authHeader !== `Bearer ${env.AUTH_TOKEN}`) { + return jsonResponse({ error: "Unauthorized" }, 401); + } + + const url = new URL(request.url); + + if (request.method === "POST" && url.pathname === "/embed") { + return handleEmbed(request, env); + } + + if (request.method === "GET" && url.pathname === "/health") { + return jsonResponse({ status: "ok" }); + } + + return jsonResponse({ error: "Not found" }, 404); + }, +} satisfies ExportedHandler; + +function jsonResponse(data: unknown, status = 200): Response { + return new Response(JSON.stringify(data), { + status, + headers: { + "Content-Type": "application/json", + "Access-Control-Allow-Origin": "*", + }, + }); +} diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..9eb7b2c --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,14 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "ES2022", + "moduleResolution": "bundler", + "strict": true, + "noUncheckedIndexedAccess": true, + "skipLibCheck": true, + "types": ["@cloudflare/workers-types"], + "outDir": "dist", + "rootDir": "src" + }, + "include": ["src"] +} diff --git a/wrangler.toml b/wrangler.toml new file mode 100644 index 0000000..de503c2 --- /dev/null +++ b/wrangler.toml @@ -0,0 +1,7 @@ +name = "embed" +main = "src/index.ts" +compatibility_date = "2024-12-01" + +[[kv_namespaces]] +binding = "EMBED_CACHE" +id = "80f3318667c04ade94fa53ba3e2285fe"