diff --git a/llm-proxy/.dockerignore b/llm-proxy/.dockerignore new file mode 100644 index 0000000..3c3629e --- /dev/null +++ b/llm-proxy/.dockerignore @@ -0,0 +1 @@ +node_modules diff --git a/llm-proxy/Dockerfile.node b/llm-proxy/Dockerfile.node new file mode 100644 index 0000000..da1cf6e --- /dev/null +++ b/llm-proxy/Dockerfile.node @@ -0,0 +1,9 @@ +FROM node:22-alpine +WORKDIR /app +COPY package.json ./ +RUN npm install --omit=dev --no-audit --no-fund +COPY server.mjs ./ +EXPOSE 8080 +HEALTHCHECK --interval=30s --timeout=3s --start-period=10s \ + CMD wget -q --spider http://127.0.0.1:8080/health || exit 1 +CMD ["node", "server.mjs"] diff --git a/llm-proxy/README.md b/llm-proxy/README.md new file mode 100644 index 0000000..3969080 --- /dev/null +++ b/llm-proxy/README.md @@ -0,0 +1,59 @@ +# canvas-llm-proxy + +In-cluster sidecar for `canvas.flow-master.ai`. Brokers +`POST /internal/canvas-llm/chat` to the configured upstream LLM provider so +the in-app Command Assistant can synthesise fluent natural-language replies +when no deterministic tool matches. + +## Why a Node sidecar (not a Python one) + +This was a Python `httpx` proxy that hand-wrote OpenAI and Anthropic +calls. PR canvas-frontend#6 swapped it for a Node sidecar that depends on +[`@earendil-works/pi-ai`](https://www.npmjs.com/package/@earendil-works/pi-ai) +— the same unified provider client `@earendil-works/pi-coding-agent` uses. +Why: + +- It is the OSS-first move the canvas user asked for ("you could use a fork + pi coding agent for that agent and then integrate it because pi coding + agent is very clean and small while being efficient and useful"). +- `pi-ai` normalises streaming completions across OpenAI (completions + + responses), Anthropic, Google Gemini, Google Vertex, Amazon Bedrock, + Azure OpenAI, Mistral, GitHub Copilot. Canvas inherits all of them. +- A future move to pi-ai's tool-calling shape (so the agent can hit real + EA2 endpoints, not just our deterministic regex matcher) becomes + mechanical instead of a rewrite. + +## Wire-compatible + +The HTTP contract is the same: `POST /internal/canvas-llm/chat` with +`{messages, max_tokens}` returns `{content, provider}`. The frontend's +`src/lib/llmClient.ts` does not change. + +## Configuration + +Set one of: `ANTHROPIC_API_KEY`, `OPENAI_API_KEY`, `GEMINI_API_KEY`. +Optional: `ANTHROPIC_MODEL`, `OPENAI_MODEL`, `GEMINI_MODEL`, `PORT` (8080). + +If no key is set, every request returns `503` so the frontend's +deterministic-tool fallback fires gracefully. + +## Run + +```bash +cd llm-proxy +npm install +ANTHROPIC_API_KEY=… node server.mjs +``` + +Container: + +```bash +docker build -f Dockerfile.node -t canvas-llm-proxy . +docker run -e ANTHROPIC_API_KEY=… -p 8080:8080 canvas-llm-proxy +``` + +## Legacy + +The previous Python sidecar (`main.py`, `requirements.txt`, `Dockerfile`) +is retained for one release so deployers can roll back. It will be +removed once the Node sidecar is in production. diff --git a/llm-proxy/package-lock.json b/llm-proxy/package-lock.json new file mode 100644 index 0000000..5789a15 --- /dev/null +++ b/llm-proxy/package-lock.json @@ -0,0 +1,1284 @@ +{ + "name": "canvas-llm-proxy", + "version": "0.2.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "canvas-llm-proxy", + "version": "0.2.0", + "dependencies": { + "@earendil-works/pi-ai": "^0.74.0" + } + }, + "node_modules/@anthropic-ai/sdk": { + "version": "0.91.1", + "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.91.1.tgz", + "integrity": "sha512-LAmu761tSN9r66ixvmciswUj/ZC+1Q4iAfpedTfSVLeswRwnY3n2Nb6Tsk+cLPP28aLOPWeMgIuTuCcMC6W/iw==", + "license": "MIT", + "dependencies": { + "json-schema-to-ts": "^3.1.1" + }, + "bin": { + "anthropic-ai-sdk": "bin/cli" + }, + "peerDependencies": { + "zod": "^3.25.0 || ^4.0.0" + }, + "peerDependenciesMeta": { + "zod": { + "optional": true + } + } + }, + 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b/llm-proxy/package.json new file mode 100644 index 0000000..91027a7 --- /dev/null +++ b/llm-proxy/package.json @@ -0,0 +1,12 @@ +{ + "name": "canvas-llm-proxy", + "private": true, + "version": "0.2.0", + "type": "module", + "scripts": { + "start": "node server.mjs" + }, + "dependencies": { + "@earendil-works/pi-ai": "^0.74.0" + } +} diff --git a/llm-proxy/server.mjs b/llm-proxy/server.mjs new file mode 100644 index 0000000..7341bdd --- /dev/null +++ b/llm-proxy/server.mjs @@ -0,0 +1,128 @@ +// Node sidecar for canvas — replaces the Python httpx proxy with the same +// pi-ai unified provider client the Pi coding agent uses. Frontend contract +// is unchanged: POST /internal/canvas-llm/chat with {messages, max_tokens} +// returns {content, provider}. Returns 503 when no provider key is set. + +import http from "node:http"; +import { + completeSimple, + registerBuiltInApiProviders, +} from "@earendil-works/pi-ai"; + +registerBuiltInApiProviders(); + +const PORT = Number(process.env.PORT ?? 8080); + +function pickModel() { + if (process.env.ANTHROPIC_API_KEY) { + return { + providerLabel: "anthropic", + api: "anthropic-messages", + id: process.env.ANTHROPIC_MODEL ?? "claude-3-5-haiku-latest", + apiKey: process.env.ANTHROPIC_API_KEY, + }; + } + if (process.env.OPENAI_API_KEY) { + return { + providerLabel: "openai", + api: "openai-completions", + id: process.env.OPENAI_MODEL ?? "gpt-4o-mini", + apiKey: process.env.OPENAI_API_KEY, + }; + } + if (process.env.GEMINI_API_KEY) { + return { + providerLabel: "google", + api: "google-gemini", + id: process.env.GEMINI_MODEL ?? "gemini-2.0-flash-exp", + apiKey: process.env.GEMINI_API_KEY, + }; + } + return null; +} + +async function readJson(req) { + return new Promise((resolve, reject) => { + const chunks = []; + req.on("data", (c) => chunks.push(c)); + req.on("end", () => { + try { + resolve(JSON.parse(Buffer.concat(chunks).toString("utf8") || "{}")); + } catch (e) { + reject(e); + } + }); + req.on("error", reject); + }); +} + +function send(res, status, body) { + res.writeHead(status, { "content-type": "application/json" }); + res.end(JSON.stringify(body)); +} + +const server = http.createServer(async (req, res) => { + if (req.method === "GET" && req.url === "/health") { + const m = pickModel(); + return send(res, 200, { + ok: true, + provider: m?.providerLabel ?? null, + providers_available: { + anthropic: !!process.env.ANTHROPIC_API_KEY, + openai: !!process.env.OPENAI_API_KEY, + google: !!process.env.GEMINI_API_KEY, + }, + }); + } + + if (req.method !== "POST" || req.url !== "/internal/canvas-llm/chat") { + return send(res, 404, { error: "not found" }); + } + + let body; + try { + body = await readJson(req); + } catch (e) { + return send(res, 400, { error: `invalid json: ${e.message}` }); + } + + const messages = Array.isArray(body.messages) ? body.messages : null; + if (!messages || messages.length === 0) { + return send(res, 400, { error: "messages[] required" }); + } + const maxTokens = Number.isFinite(body.max_tokens) ? Number(body.max_tokens) : 320; + + const model = pickModel(); + if (!model) { + return send(res, 503, { + error: "natural language replies are not enabled in this environment", + }); + } + + try { + const piModel = { api: model.api, id: model.id, apiKey: model.apiKey }; + const context = { messages, maxTokens }; + const reply = await completeSimple(piModel, context, {}); + const content = + typeof reply === "string" + ? reply + : typeof reply?.content === "string" + ? reply.content + : typeof reply?.text === "string" + ? reply.text + : ""; + return send(res, 200, { + content: String(content).trim(), + provider: model.providerLabel, + }); + } catch (e) { + return send(res, 502, { + error: `${model.providerLabel} upstream`, + message: String(e?.message ?? e).slice(0, 500), + }); + } +}); + +server.listen(PORT, () => { + console.log(`canvas-llm-proxy listening on :${PORT}`); +});