Ghost/ghost/domain-events
Steve Larson a1c4e64994
Added queueing middleware to handle high request volume (#19887)
ref https://linear.app/tryghost/issue/CFR-4/
- added request queueing middleware (express-queue) to handle high
request volume
- added new config option `optimization.requestQueue`
- added new config option `optimization.requestConcurrency`
- added logging of request queue depth - `req.queueDepth`

We've done a fair amount of investigation around improving Ghost's
resiliency to high request volume. While we believe this to be partly
due to database connection contention, it also seems Ghost gets
overwhelmed by the requests themselves. Implementing a simple queueing
system allows us a simple lever to change the volume of requests Ghost
is actually ingesting at any given time and gives us options besides
simply increasing database connection pool size.

---------

Co-authored-by: Michael Barrett <mike@ghost.org>
2024-03-21 09:25:07 -05:00
..
lib Fixed @tryghost/domain-events relying on NODE_ENV 2023-09-02 16:58:48 +07:00
test Updated to use assert/strict everywhere (#17047) 2023-06-21 09:56:59 +01:00
.eslintrc.js Updated Eslint ECMAScript compatibility to 2022 2022-08-09 15:51:40 +02:00
index.js Added @tryghost/domain-events package 2021-09-17 15:22:08 +02:00
package.json Added queueing middleware to handle high request volume (#19887) 2024-03-21 09:25:07 -05:00
README.md Tidied up package READMEs 2022-07-25 15:17:12 +02:00

Domain Events

Usage

const DomainEvents = require('@tryghost/domain-events');

class MyEvent {
    constructor(message) {
        this.timestamp = new Date();
        this.data = {
            message
        };
    }
}

DomainEvents.subscribe(MyEvent, function handler(event) {
    console.log(event.data.message);
});

const event = new MyEvent('hello world');

DomainEvents.dispatch(event);