refactor(gateway): split server runtime

src/gateway/server-discovery-runtime.ts

@@ -0,0 +1,79 @@
+import { startGatewayBonjourAdvertiser } from "../infra/bonjour.js";
+import {
+  pickPrimaryTailnetIPv4,
+  pickPrimaryTailnetIPv6,
+} from "../infra/tailnet.js";
+import {
+  WIDE_AREA_DISCOVERY_DOMAIN,
+  writeWideAreaBridgeZone,
+} from "../infra/widearea-dns.js";
+import {
+  formatBonjourInstanceName,
+  resolveBonjourCliPath,
+  resolveTailnetDnsHint,
+} from "./server-discovery.js";
+
+export async function startGatewayDiscovery(params: {
+  machineDisplayName: string;
+  port: number;
+  bridgePort?: number;
+  canvasPort?: number;
+  wideAreaDiscoveryEnabled: boolean;
+  logDiscovery: { info: (msg: string) => void; warn: (msg: string) => void };
+}) {
+  let bonjourStop: (() => Promise<void>) | null = null;
+  const tailnetDns = await resolveTailnetDnsHint();
+  const sshPortEnv = process.env.CLAWDBOT_SSH_PORT?.trim();
+  const sshPortParsed = sshPortEnv ? Number.parseInt(sshPortEnv, 10) : NaN;
+  const sshPort =
+    Number.isFinite(sshPortParsed) && sshPortParsed > 0
+      ? sshPortParsed
+      : undefined;
+
+  try {
+    const bonjour = await startGatewayBonjourAdvertiser({
+      instanceName: formatBonjourInstanceName(params.machineDisplayName),
+      gatewayPort: params.port,
+      bridgePort: params.bridgePort,
+      canvasPort: params.canvasPort,
+      sshPort,
+      tailnetDns,
+      cliPath: resolveBonjourCliPath(),
+    });
+    bonjourStop = bonjour.stop;
+  } catch (err) {
+    params.logDiscovery.warn(`bonjour advertising failed: ${String(err)}`);
+  }
+
+  if (params.wideAreaDiscoveryEnabled && params.bridgePort) {
+    const tailnetIPv4 = pickPrimaryTailnetIPv4();
+    if (!tailnetIPv4) {
+      params.logDiscovery.warn(
+        "discovery.wideArea.enabled is true, but no Tailscale IPv4 address was found; skipping unicast DNS-SD zone update",
+      );
+    } else {
+      try {
+        const tailnetIPv6 = pickPrimaryTailnetIPv6();
+        const result = await writeWideAreaBridgeZone({
+          bridgePort: params.bridgePort,
+          gatewayPort: params.port,
+          displayName: formatBonjourInstanceName(params.machineDisplayName),
+          tailnetIPv4,
+          tailnetIPv6: tailnetIPv6 ?? undefined,
+          tailnetDns,
+          sshPort,
+          cliPath: resolveBonjourCliPath(),
+        });
+        params.logDiscovery.info(
+          `wide-area DNS-SD ${result.changed ? "updated" : "unchanged"} (${WIDE_AREA_DISCOVERY_DOMAIN} → ${result.zonePath})`,
+        );
+      } catch (err) {
+        params.logDiscovery.warn(
+          `wide-area discovery update failed: ${String(err)}`,
+        );
+      }
+    }
+  }
+
+  return { bonjourStop };
+}