jschoubben
d59649de0a
The mesh's resolver is more than config after all. Tools: dnsmasq_names (what this node answers, from the generated wildcard file) and dnsmasq_resolve (resolve a name through this node's own resolver — the check that wildcard-resolution actually answers). Event: it watches the wildcard file and emits module.dnsmasq.name.added/.removed as machines' names become resolvable here — DNS having propagated to this node, distinct from the mesh's node.* events. Typechecks; manifest parses.
39 lines
1.5 KiB
TypeScript
39 lines
1.5 KiB
TypeScript
// dnsmasq's events. The resolver's answered set changes whenever the mesh rewrites the wildcard file
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// and restarts it — a machine joined the private network or left it. This watches that file and
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// announces, from the resolver's own vantage, that a name became (or stopped being) resolvable on
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// this node: DNS having actually propagated here, distinct from the mesh's own node.* events.
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//
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// Emits (novox/hq ADR 0046/0047):
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// module.dnsmasq.name.added — this node's resolver now answers a machine's name
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// module.dnsmasq.name.removed — it no longer does
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import { emit } from "@novox/mesh-sdk/events";
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import { DnsmasqClient } from "./client.js";
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const dnsmasq = DnsmasqClient.fromEnv();
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// name -> address, primed silently so a restart does not re-announce every name it already answered.
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const known = new Map<string, string>();
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let primed = false;
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async function poll(): Promise<void> {
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const now = new Map((await dnsmasq.answeredNames()).map((a) => [a.name, a.address]));
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if (primed) {
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for (const [name, address] of now) {
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if (!known.has(name)) await emit("module.dnsmasq.name.added", { name, address });
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}
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for (const [name] of known) {
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if (!now.has(name)) await emit("module.dnsmasq.name.removed", { name });
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}
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}
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known.clear();
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for (const [name, address] of now) known.set(name, address);
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primed = true;
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}
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const run = (): void => void poll().catch((err) => console.error(`[dnsmasq] ${err}`));
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setInterval(run, 30_000);
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run();
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console.log("[dnsmasq] watching the resolver's answered names");
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