refactor(gateway): split server helpers

src/gateway/server-discovery.ts

@@ -0,0 +1,76 @@
+import fs from "node:fs";
+import path from "node:path";
+import { getTailnetHostname } from "../infra/tailscale.js";
+import { runExec } from "../process/exec.js";
+
+export type ResolveBonjourCliPathOptions = {
+  env?: NodeJS.ProcessEnv;
+  argv?: string[];
+  execPath?: string;
+  cwd?: string;
+  statSync?: (path: string) => fs.Stats;
+};
+
+export function formatBonjourInstanceName(displayName: string) {
+  const trimmed = displayName.trim();
+  if (!trimmed) return "Clawdis";
+  if (/clawdis/i.test(trimmed)) return trimmed;
+  return `${trimmed} (Clawdis)`;
+}
+
+export function resolveBonjourCliPath(
+  opts: ResolveBonjourCliPathOptions = {},
+): string | undefined {
+  const env = opts.env ?? process.env;
+  const envPath = env.CLAWDIS_CLI_PATH?.trim();
+  if (envPath) return envPath;
+
+  const statSync = opts.statSync ?? fs.statSync;
+  const isFile = (candidate: string) => {
+    try {
+      return statSync(candidate).isFile();
+    } catch {
+      return false;
+    }
+  };
+
+  const execPath = opts.execPath ?? process.execPath;
+  const execDir = path.dirname(execPath);
+  const siblingCli = path.join(execDir, "clawdis");
+  if (isFile(siblingCli)) return siblingCli;
+
+  const argv = opts.argv ?? process.argv;
+  const argvPath = argv[1];
+  if (argvPath && isFile(argvPath)) {
+    const base = path.basename(argvPath);
+    if (!base.includes("gateway-daemon")) return argvPath;
+  }
+
+  const cwd = opts.cwd ?? process.cwd();
+  const distCli = path.join(cwd, "dist", "index.js");
+  if (isFile(distCli)) return distCli;
+  const binCli = path.join(cwd, "bin", "clawdis.js");
+  if (isFile(binCli)) return binCli;
+
+  return undefined;
+}
+
+export async function resolveTailnetDnsHint(opts?: {
+  env?: NodeJS.ProcessEnv;
+  exec?: typeof runExec;
+}): Promise<string | undefined> {
+  const env = opts?.env ?? process.env;
+  const envRaw = env.CLAWDIS_TAILNET_DNS?.trim();
+  const envValue = envRaw && envRaw.length > 0 ? envRaw.replace(/\.$/, "") : "";
+  if (envValue) return envValue;
+
+  const exec =
+    opts?.exec ??
+    ((command, args) =>
+      runExec(command, args, { timeoutMs: 1500, maxBuffer: 200_000 }));
+  try {
+    return await getTailnetHostname(exec);
+  } catch {
+    return undefined;
+  }
+}