Koa-OAI-Router-Cache

Request form cache plugin for koa-oai-router.

Installation

Multi-strategy object caching service depends on catbox.

npm i koa-oai-router-cache catbox-redis --save

Info

field	type	info
name	string	cache
evoked fields	string	x-oai-cache
evoked value	object	enable, expire
options	object	hit, key, value

• evoked value object

  • enable boolean enable cache, default true
  • expire string|number ttl

    1. ms, milli, millisecond, milliseconds - will parse to milliseconds
    2. s, sec, secs, second, seconds - will parse to seconds
    3. m, min, mins, minute, minutes - will parse to minutes
    4. h, hr, hrs, hour, hours - will parse to hours
    5. d, day, days - will parse to days
    6. w, week, weeks - will parse to weeks
    7. mon, mth, mths, month, months - will parse to months
    8. y, yr, yrs, year, years - will parse to years
    

  • uid boolean get uid as cache key, default false.
  • memory boolean use memory cache, 100MB max.

• options object

  • hit object | boolean false not response header. true responses header x-oai-hit: true. string response header with custom key.
  • uid function uid key builder. having args (ctx) and must return string
  • key function cache key builder. having args (ctx) and must return {id, segment}
  • keyInParameters boolean only build cache key in parameters, default true
  • value function cache value builder. having args (ctx) and must return {type, value}

Usage

Simple code:

const Koa = require('koa');
const Router = require('koa-oai-router');
const middlewareLoader = require('koa-oai-router-middleware');
const cacheHandler = require('koa-oai-router-cache');
const catboxRedis = require('catbox-redis');
 
const app = new Koa();
const router = new Router({
  apiDoc: './api',
});
 
router.moount();
 
router.mount(middlewareLoader('./controllers'));
router.mount(cacheHandler({engine: catboxRedis, options: {url: 'redis://127.0.0.1:6379'}}));
 
app.use(bodyParser());
app.use(router.routes());

/pets-string:
  get:
    description: "Returns all pets from the system that the user has access to"
    operationId: "findPets"
    produces:
      - "application/json"
    tags:
      - pets
    parameters:
      - name: "name"
        in: "query"
        required: true
        type: "string"
    # configure api cache here 
    x-oai-cache:
      expire: 10s
    x-oai-middleware:
      - file: pets
        handler: replyString
    responses:
      "200":
        description: "pet response"
        schema:
          type: "array"
          items:
            $ref: "#/definitions/Pet"
      default:
        description: "unexpected error"