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| Current File : //proc/self/root/home/ubuntu/node-v16.18.1/test/parallel/test-diagnostics-channel-pub-sub.js |
'use strict';
const common = require('../common');
const dc = require('diagnostics_channel');
const assert = require('assert');
const { Channel } = dc;
const name = 'test';
const input = {
foo: 'bar'
};
// Individual channel objects can be created to avoid future lookups
const channel = dc.channel(name);
assert.ok(channel instanceof Channel);
// No subscribers yet, should not publish
assert.ok(!channel.hasSubscribers);
const subscriber = common.mustCall((message, name) => {
assert.strictEqual(name, channel.name);
assert.deepStrictEqual(message, input);
});
// Now there's a subscriber, should publish
dc.subscribe(name, subscriber);
assert.ok(channel.hasSubscribers);
// The ActiveChannel prototype swap should not fail instanceof
assert.ok(channel instanceof Channel);
// Should trigger the subscriber once
channel.publish(input);
// Should not publish after subscriber is unsubscribed
assert.ok(dc.unsubscribe(name, subscriber));
assert.ok(!channel.hasSubscribers);
// unsubscribe() should return false when subscriber is not found
assert.ok(!dc.unsubscribe(name, subscriber));
assert.throws(() => {
dc.subscribe(name, null);
}, { code: 'ERR_INVALID_ARG_TYPE' });
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