From 6839ae6f6a094bb65ec72828e338fac8e748b96d Mon Sep 17 00:00:00 2001 From: Praveen Thirumurugan Date: Sat, 18 Oct 2025 01:22:02 +0530 Subject: [PATCH] feat: init llm-proxy --- .gitignore | 106 +++++ Dockerfile | 22 ++ README.md | 74 ++++ cost.ts | 48 +++ package-lock.json | 972 ++++++++++++++++++++++++++++++++++++++++++++++ package.json | 21 + proxy.ts | 191 +++++++++ tsconfig.json | 12 + 8 files changed, 1446 insertions(+) create mode 100644 .gitignore create mode 100644 Dockerfile create mode 100644 README.md create mode 100644 cost.ts create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 proxy.ts create mode 100644 tsconfig.json diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..3738f3c --- /dev/null +++ b/.gitignore @@ -0,0 +1,106 @@ +# Dependencies +node_modules/ +npm-debug.log* +yarn-debug.log* +yarn-error.log* + +# Build outputs +dist/ +build/ +*.tsbuildinfo + +# Environment variables +.env +.env.local +.env.development.local +.env.test.local +.env.production.local + +# IDE and editor files +.vscode/ +.idea/ +*.swp +*.swo +*~ + +# OS generated files +.DS_Store +.DS_Store? +._* +.Spotlight-V100 +.Trashes +ehthumbs.db +Thumbs.db + +# Logs +logs +*.log + +# Runtime data +pids +*.pid +*.seed +*.pid.lock + +# Coverage directory used by tools like istanbul +coverage/ +*.lcov + +# nyc test coverage +.nyc_output + +# Optional npm cache directory +.npm + +# Optional eslint cache +.eslintcache + +# Optional REPL history +.node_repl_history + +# Output of 'npm pack' +*.tgz + +# Yarn Integrity file +.yarn-integrity + +# dotenv environment variables file +.env.test + +# parcel-bundler cache (https://parceljs.org/) +.cache +.parcel-cache + +# next.js build output +.next + +# nuxt.js build output +.nuxt + +# vuepress build output +.vuepress/dist + +# Serverless directories +.serverless/ + +# FuseBox cache +.fusebox/ + +# DynamoDB Local files +.dynamodb/ + +# TernJS port file +.tern-port + +# Stores VSCode versions used for testing VSCode extensions +.vscode-test + +# yarn v2 +.yarn/cache +.yarn/unplugged +.yarn/build-state.yml +.yarn/install-state.gz +.pnp.* + +# TypeScript +*.tsbuildinfo diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..79f701c --- /dev/null +++ b/Dockerfile @@ -0,0 +1,22 @@ +# Dockerfile +FROM node:22-slim + +WORKDIR /app + +# Copy package files first for caching +COPY package*.json ./ + +# Install ALL dependencies (including devDeps for TypeScript) +RUN npm install + +# Copy all source code +COPY . . + +# Compile TypeScript inside container +RUN npx tsc + +ENV PORT=8080 +EXPOSE 8080 + +# Run the compiled JS file +CMD ["node", "dist/proxy.js"] diff --git a/README.md b/README.md new file mode 100644 index 0000000..e9c3c2d --- /dev/null +++ b/README.md @@ -0,0 +1,74 @@ +# LLM Proxy Server + +A simple OpenAI-compatible proxy server that forwards requests to any LLM endpoint with logging and cost tracking. The logs are stored in a PostgreSQL database. It's not possible to ignore the logging at the moment. + +## Configuration + +| Environment Variable | Description | Default Value | +|----------------------|-------------|-----------------| +| `PORT` | Server port | `3007` | +| `UPSTREAM_URL` | Your LLM endpoint URL | `""` | +| `DATABASE_URL` | PostgreSQL connection string for logging | `""` | +| `DATABASE_TABLE` | Name of the table to store the logs | `"llm_proxy"` | + +### Cost Calculation + +The cost is calculated based on the model and the usage. + +You'll need to add the cost configuration for your models in the `cost.ts` file. The default cost configuration in the project (with sample values from `z.ai` models) is: + +```typescript +export const MODEL_COSTS: Record = { + "glm-4.5-air": { input: 0.2, cached: 0.03, output: 1.1 }, // cost per million prompt tokens (USD) + "glm-4.6": { input: 0.6, cached: 0.11, output: 2.2 }, // cost per million cached tokens (USD) + "default": { input: 0, cached: 0, output: 0 }, // default cost configuration +}; +``` + +You can add more models to the `MODEL_COSTS` object. + +## PostgreSQL Table Schema + +```sql +CREATE TABLE IF NOT EXISTS ( + timestamp TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, + request_method VARCHAR(10) NOT NULL, + request_path VARCHAR(255) NOT NULL, + model VARCHAR(20) NOT NULL, + completion_tokens INTEGER, + prompt_tokens INTEGER, + total_tokens INTEGER, + cached_tokens INTEGER, + total_cost NUMERIC, + response_time INTEGER, + request_body JSONB, + response_body JSONB, + response_status INTEGER, + provider_url VARCHAR(500) +); + +CREATE INDEX IF NOT EXISTS idx__timestamp ON (timestamp); +``` + +## Usage + +The proxy works with any OpenAI-compatible endpoint. Just point your client to the proxy: + +```bash +curl -X POST http://localhost:3007/chat/completions \ + -H "Content-Type: application/json" \ + -H "Authorization: Bearer your-api-key" \ + -d '{ + "model": "your-model", + "messages": [{"role": "user", "content": "Hello!"}] + }' +``` + +## Features + +- ✅ OpenAI-compatible API +- ✅ Streaming support +- ✅ PostgreSQL logging +- ✅ Cost tracking +- ✅ CORS enabled +- ✅ Simple configuration - just set your endpoint URL diff --git a/cost.ts b/cost.ts new file mode 100644 index 0000000..22edc97 --- /dev/null +++ b/cost.ts @@ -0,0 +1,48 @@ +// cost.ts +// Helper for calculating token-based LLM costs + +export type Usage = { + prompt_tokens?: number; + completion_tokens?: number; + total_tokens?: number; + prompt_tokens_details?: { + cached_tokens?: number; + } +}; + +export type CostConfig = { + input: number; // cost per million prompt tokens (USD) + cached: number; // cost per million cached tokens (USD) + output: number; // cost per million completion tokens (USD) +}; + +// Cost table per model (USD per million tokens) +export const MODEL_COSTS: Record = { + "glm-4.5-air": { input: 0.2, cached: 0.03, output: 1.1 }, + "glm-4.6": { input: 0.6, cached: 0.11, output: 2.2 }, + "default": { input: 0, cached: 0, output: 0 }, +}; + +// Compute total cost (in USD) +export function calculateCost(model: string, usage?: Usage): number | null { + if (!usage) return null; + + const { prompt_tokens = 0, completion_tokens = 0, prompt_tokens_details = { cached_tokens: 0 } } = usage; + const cost = MODEL_COSTS[model] || MODEL_COSTS["default"]; + + let inputCost = 0; + let cachedCost = 0; + let outputCost = 0; + + if (prompt_tokens_details?.cached_tokens) { + cachedCost = ((prompt_tokens_details.cached_tokens) / 1_000_000) * cost.cached; + inputCost = ((prompt_tokens - prompt_tokens_details.cached_tokens) / 1_000_000) * cost.input; + } else { + inputCost = ((prompt_tokens) / 1_000_000) * cost.input; + } + + outputCost = (completion_tokens / 1_000_000) * cost.output; + + const total = inputCost + cachedCost + outputCost; + return total > 0 ? 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"^2.0.0", + "typescript": "^5.9.3" + }, + "dependencies": { + "dotenv": "^17.2.3", + "pg": "^8.16.3" + } +} diff --git a/proxy.ts b/proxy.ts new file mode 100644 index 0000000..ef6f063 --- /dev/null +++ b/proxy.ts @@ -0,0 +1,191 @@ +// proxy.ts +// Minimal OpenAI-compatible proxy with streaming & PostgreSQL logging. +// Node 18+ required. + +import "dotenv/config"; +import http, { IncomingMessage, ServerResponse } from "http"; +import { TextDecoder } from "util"; +import { Pool } from "pg"; + +import { calculateCost } from "./cost"; + +const PORT = Number(process.env.PORT || 3007); +const UPSTREAM_URL = (process.env.UPSTREAM_URL || "").replace(/\/+$/, ""); + +// --- PostgreSQL connection --- +const pool = new Pool({ + connectionString: process.env.DATABASE_URL, +}); + +// --- Helper functions --- +function setCors(res: ServerResponse) { + res.setHeader("Access-Control-Allow-Origin", "*"); + res.setHeader("Access-Control-Allow-Headers", "Authorization, Content-Type, X-Requested-With"); + res.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS"); +} + +function readBody(req: IncomingMessage): Promise { + return new Promise((resolve, reject) => { + const chunks: Buffer[] = []; + req.on("data", (c: Buffer) => chunks.push(c)); + req.on("end", () => resolve(Buffer.concat(chunks))); + req.on("error", reject); + }); +} + +function okPath(path: string) { + return path.startsWith("/chat/completions") || + path.startsWith("/completions") || + path.startsWith("/models"); +} + +// --- Logging to Postgres --- +async function logToPG(data: Record) { + const keys = Object.keys(data); + const cols = keys.map(k => `"${k}"`).join(","); + const vals = keys.map((_, i) => `$${i + 1}`).join(","); + const values = Object.values(data); + + await pool.query(`INSERT INTO ${process.env.DATABASE_TABLE || "llm_proxy"} (${cols}) VALUES (${vals})`, values); +} + +// --- Main proxy server --- +const server = http.createServer(async (req, res) => { + const start = Date.now(); + setCors(res); + + if (req.method === "OPTIONS") { + res.statusCode = 204; + return res.end(); + } + + try { + const url = new URL(req.url || "/", `http://${req.headers.host}`); + const path = url.pathname; + const method = req.method || "GET"; + + if (!okPath(path)) { + res.statusCode = 404; + res.end(JSON.stringify({ error: "Not found" })); + return; + } + + const auth = req.headers["authorization"]; + if (!auth?.toString().startsWith("Bearer ")) { + res.statusCode = 401; + res.end(JSON.stringify({ error: "Missing or invalid Authorization header" })); + return; + } + + const bodyBuf = method === "POST" ? await readBody(req) : Buffer.from(""); + const requestJson = bodyBuf.length ? JSON.parse(bodyBuf.toString()) : null; + + const upstreamRes = await fetch(UPSTREAM_URL + path + url.search, { + method, + headers: { + "Content-Type": (req.headers["content-type"] as string) || "application/json", + Authorization: auth.toString(), + }, + // @ts-ignore + duplex: "half", + body: method === "POST" ? bodyBuf.toString() : undefined, + }); + + const contentType = upstreamRes.headers.get("content-type") || "application/json"; + res.statusCode = upstreamRes.status; + res.setHeader("Content-Type", contentType); + + // --- Streaming or non-streaming response handling --- + let responseBody: any = null; + if (contentType.includes("text/event-stream")) { + res.setHeader("Cache-Control", "no-cache"); + res.setHeader("Connection", "keep-alive"); + res.setHeader("Transfer-Encoding", "chunked"); + + const reader = upstreamRes.body?.getReader(); + const decoder = new TextDecoder(); + + let rawText = ""; + let usageFromStream: any = null; + + if (reader) { + let buffer = ""; + while (true) { + const { done, value } = await reader.read(); + if (done) break; + if (value) { + const chunk = decoder.decode(value); + res.write(value); + rawText += chunk; + + buffer += chunk; + const lines = buffer.split(/\r?\n/); + buffer = lines.pop() || ""; + + for (const line of lines) { + if (!line.startsWith("data:")) continue; + const jsonStr = line.slice(5).trim(); + if (jsonStr === "[DONE]") continue; + try { + const obj = JSON.parse(jsonStr); + if (obj.usage) usageFromStream = obj.usage; + } catch { + /* ignore partial lines */ + } + } + } + } + } + res.end(); + + // Use whatever we captured from the stream + responseBody = { + streamed: true, + preview: rawText.slice(0, 5000), + usage: usageFromStream, + }; + } + else { + const text = await upstreamRes.text(); + res.end(text); + try { + responseBody = JSON.parse(text); + } catch { + responseBody = text; + } + } + + // --- Token usage and metadata --- + const usage = responseBody?.usage || {}; + const totalCost = calculateCost(requestJson?.model || "default", usage); + + const logData = { + timestamp: new Date(), + request_method: method, + request_path: path, + model: requestJson?.model || "default", + completion_tokens: usage.completion_tokens || null, + prompt_tokens: usage.prompt_tokens || null, + total_tokens: usage.total_tokens || null, + cached_tokens: usage.cached_tokens || null, + total_cost: totalCost, + response_time: Date.now() - start, + request_body: requestJson, + response_body: responseBody, + response_status: upstreamRes.status, + provider_url: UPSTREAM_URL, + provider: "Upstream", + }; + + logToPG(logData).catch(err => console.error("PG log error:", err)); + + } catch (err: any) { + console.error("Proxy error:", err); + res.statusCode = 502; + res.end(JSON.stringify({ error: "Proxy error", message: err?.message })); + } +}); + +server.listen(PORT, () => { + console.log(`✅ Proxy running at http://localhost:${PORT}`); +}); diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..c074e06 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,12 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "CommonJS", + "rootDir": ".", + "outDir": "dist", + "esModuleInterop": true, + "strict": true, + "skipLibCheck": true + }, + "include": ["*.ts"] +}