feat: complete TASK-WP0-07 supervisor

apps/api/src/main.ts

@@ -2,6 +2,12 @@ import { resolve } from "node:path";
 
 import { createApp } from "./app.js";
 import { readBrowserSupportRelease } from "./browser-support.js";
+import { attachApiSupervisorControl, initializeApiCredentialClients, receiveApiCredentials } from "./supervisor-channel.js";
+
+const credentialChannelEnabled = process.argv.includes("--dada-credential-stdin");
+if (credentialChannelEnabled) {
+  initializeApiCredentialClients(await receiveApiCredentials());
+}
 
 const browserSupportRelease = readBrowserSupportRelease(resolve("RELEASE.json"));
 const app = await createApp(browserSupportRelease ? { browserSupportRelease } : {});
@@ -10,3 +16,10 @@ await app.listen({
   host: "127.0.0.1",
   port: 43121,
 });
+
+const controlPipeIndex = process.argv.indexOf("--dada-control-pipe");
+if (controlPipeIndex >= 0) {
+  const controlPipe = process.argv[controlPipeIndex + 1];
+  if (!controlPipe) throw new Error("Supervisor control pipe name is required.");
+  attachApiSupervisorControl(controlPipe, () => app.close());
+}

apps/api/src/supervisor-channel.ts

@@ -0,0 +1,46 @@
+import { createConnection } from "node:net";
+
+const API_CREDENTIALS = ["Dada/P0A/api/resend", "Dada/P0A/api/amap"] as const;
+
+export async function receiveApiCredentials(input: NodeJS.ReadableStream = process.stdin) {
+  const chunks: Buffer[] = [];
+  for await (const chunk of input) chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
+  const payload = Buffer.concat(chunks);
+  try {
+    const parsed = JSON.parse(payload.toString("utf8")) as Record<string, unknown>;
+    const names = Object.keys(parsed).sort();
+    const expected = [...API_CREDENTIALS].sort();
+    if (names.length !== expected.length || names.some((name, index) => name !== expected[index])) {
+      throw new Error("API credential channel contains an unexpected credential scope.");
+    }
+    if (expected.some((name) => typeof parsed[name] !== "string" || parsed[name] === "")) {
+      throw new Error("API credential channel contains an invalid credential value.");
+    }
+    return parsed as Record<(typeof API_CREDENTIALS)[number], string>;
+  } finally {
+    payload.fill(0);
+    for (const chunk of chunks) chunk.fill(0);
+    chunks.length = 0;
+  }
+}
+
+export function initializeApiCredentialClients(credentials: Record<(typeof API_CREDENTIALS)[number], string>) {
+  const configured = API_CREDENTIALS.every((name) => credentials[name].length > 0);
+  for (const name of API_CREDENTIALS) credentials[name] = "";
+  if (!configured) throw new Error("API credential client initialization failed.");
+}
+
+export function attachApiSupervisorControl(pipeName: string, shutdown: () => Promise<void>) {
+  const socket = createConnection(`\\\\.\\pipe\\${pipeName}`);
+  let pending = "";
+  socket.setEncoding("utf8");
+  socket.on("connect", () => socket.write("ready\n"));
+  socket.on("data", (chunk) => {
+    pending += chunk;
+    if (!pending.includes("\n")) return;
+    const [command] = pending.split("\n", 1);
+    pending = "";
+    if (command === "shutdown") void shutdown().finally(() => socket.end());
+  });
+  return socket;
+}