backstage의 이해 - cache

[hellices]

backstage의 backend는 성능 향상을 위해 caching기능을 지원한다.

cache 라이브러리는 keyv를 사용한다.
backstage는 plugin별로 캐시 커넥션을 맺는 방식

caching engine

• memory(local for test)
• memcache
• redis

keyv feature

• Isn't bloated
• Has a simple Promise based API
• Suitable as a TTL based cache or persistent key-value store
• Easily embeddable inside another module
• Works with any storage that implements the Map API
• Handles all JSON types plus Buffer
• Supports namespaces
• Wide range of efficient, well tested storage adapters
• Connection errors are passed through (db failures won't kill your app)
• Supports the current active LTS version of Node.js or higher

adapters

3rd party adapter add-on 가능
이 중 quick-lru는 깔끔해보이는듯?

• quick-lru - Simple "Least Recently Used" (LRU) cache
• keyv-file - File system storage adapter for Keyv
• keyv-dynamodb - DynamoDB storage adapter for Keyv
• keyv-lru - LRU storage adapter for Keyv
• keyv-null - Null storage adapter for Keyv
• keyv-firestore – Firebase Cloud Firestore adapter for Keyv
• keyv-mssql - Microsoft Sql Server adapter for Keyv
• keyv-azuretable - Azure Table Storage/API adapter for Keyv
• keyv-arango - ArangoDB storage adapter for Keyv
• keyv-momento - Momento storage adapter for Keyv

cache를 테스트해보자

1. 빈 폴더에서 npm init 실행하기(옵션은 그냥 디폴트)

npm init
npm install keyv, quick-lru

2. ES6스타일로 작성하기 위해서(require -> import) package.json에 "type": "module" 추가
3. test.js 작성

import Keyv from 'keyv'

const keyv = new Keyv();

// Handle DB connection errors
keyv.on('error', err => console.log('Connection Error', err));

await keyv.set('foo', 'expires in 1 second', 1000); // true
await keyv.get('foo').then(x => console.log(x)); // 'never expires'
await keyv.set('foo', 'never expires'); // true
await keyv.get('foo').then(x => console.log(x)); // 'never expires'
await keyv.delete('foo'); // true
await keyv.clear(); // undefined

4. 실행

node test.js