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registry.js
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Fri, Jan 10, 05:36

registry.js
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"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Registry = void 0;
const array_flatten_1 = __importDefault(require("array-flatten"));
const dns_equal_1 = __importDefault(require("dns-equal"));
const service_1 = __importDefault(require("./service"));
const REANNOUNCE_MAX_MS = 60 * 60 * 1000;
const REANNOUNCE_FACTOR = 3;
class Registry {
constructor(server) {
this.services = [];
this.server = server;
}
publish(config) {
function start(service, registry, opts) {
if (service.activated)
return;
service.activated = true;
registry.services.push(service);
if (!(service instanceof service_1.default))
return;
if (opts.probe) {
registry.probe(registry.server.mdns, service, (exists) => {
if (exists) {
service.stop();
console.log(new Error('Service name is already in use on the network'));
return;
}
registry.announce(registry.server, service);
});
}
else {
registry.announce(registry.server, service);
}
}
function stop(service, registry, callback) {
if (!service.activated)
return;
if (!(service instanceof service_1.default))
return;
registry.teardown(registry.server, service, callback);
const index = registry.services.indexOf(service);
if (index !== -1)
registry.services.splice(index, 1);
}
const service = new service_1.default(config);
service.start = start.bind(null, service, this);
service.stop = stop.bind(null, service, this);
service.start({ probe: config.probe !== false });
return service;
}
unpublishAll(callback) {
this.teardown(this.server, this.services, callback);
this.services = [];
}
destroy() {
this.services.map(service => service.destroyed = true);
}
probe(mdns, service, callback) {
var sent = false;
var retries = 0;
var timer;
const send = () => {
if (!service.activated || service.destroyed)
return;
mdns.query(service.fqdn, 'ANY', function () {
sent = true;
timer = setTimeout(++retries < 3 ? send : done, 250);
timer.unref();
});
};
const onresponse = (packet) => {
if (!sent)
return;
if (packet.answers.some(matchRR) || packet.additionals.some(matchRR))
done(true);
};
const matchRR = (rr) => {
return (0, dns_equal_1.default)(rr.name, service.fqdn);
};
const done = (exists) => {
mdns.removeListener('response', onresponse);
clearTimeout(timer);
callback(!!exists);
};
mdns.on('response', onresponse);
setTimeout(send, Math.random() * 250);
}
announce(server, service) {
var delay = 1000;
var packet = service.records();
server.register(packet);
const broadcast = () => {
if (!service.activated || service.destroyed)
return;
server.mdns.respond(packet, function () {
if (!service.published) {
service.activated = true;
service.published = true;
service.emit('up');
}
delay = delay * REANNOUNCE_FACTOR;
if (delay < REANNOUNCE_MAX_MS && !service.destroyed) {
setTimeout(broadcast, delay).unref();
}
});
};
broadcast();
}
teardown(server, services, callback) {
if (!Array.isArray(services))
services = [services];
services = services.filter((service) => service.activated);
var records = array_flatten_1.default.depth(services.map(function (service) {
service.activated = false;
var records = service.records();
records.forEach((record) => {
record.ttl = 0;
});
return records;
}), 1);
if (records.length === 0)
return callback && callback();
server.unregister(records);
server.mdns.respond(records, function () {
services.forEach(function (service) {
service.published = false;
});
if (typeof callback === "function") {
callback.apply(null, arguments);
}
});
}
}
exports.Registry = Registry;
exports.default = Registry;
//# sourceMappingURL=registry.js.map

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