JSPM – koa-router-cache@1.1.0

Package Exports

koa-router-cache

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Readme

koa-router-cache

Router cache middleware for koa.

Release notes

koa-router-cache v1.0.0 released, v0.3.0 readme see v0.3.0_README.md.

Install

npm i koa-router-cache --save

Usage

cache(app, options)

Options:

key: {String|GeneratorFunction} cache key. (Required)
expire: {Number} expire time, in ms. (Required)
get: {GeneratorFunction} custom getter function for getting data from cache. (Required)
set: {GeneratorFunction} custom setter function for setting data to cache. (Required)
passthrough: {GeneratorFunction} whether pass request through, return Boolean. (Required)
evtName: {String} event name for destroy cache. (Optional)
destroy: {function} destroy cache. (Optional)
pathToRegexp {Object} pathToRegexp options, see https://github.com/pillarjs/path-to-regexp#usage. (Optional)

Example

koa-router-cache build-in simple MemoryCache and RedisCache, also you can write by yourself.

MemoryCache

'use strict';

var app = require('koa')();
var cache = require('../');
var MemoryCache = cache.MemoryCache;

var count = 0;

app.use(cache(app, {
  'GET /': {
    key: 'cache:index',
    expire: 2 * 1000,
    get: MemoryCache.get,
    set: MemoryCache.set,
    passthrough: function* (_cache) {
      if (_cache == null) {
        return true;
      }
      this.body = _cache;
      return false;
    },
    evtName: 'clearIndexCache',
    destroy: MemoryCache.destroy
  }
}));

app.use(function* () {
  this.body = count++;
  if (count === 3) {
    count = 0;
    this.app.emit('clearIndexCache');
  }
});

app.listen(3000, function () {
  console.log('listening on 3000.');
});

RedisCache

'use strict';

var app = require('koa')();
var cache = require('../');
var RedisCache = cache.RedisCache();// or RedisCache(client)

var count = 0;

app.use(cache(app, {
  'GET /': {
    key: 'cache:index',
    expire: 2 * 1000,
    get: RedisCache.get,
    set: RedisCache.set,
    passthrough: function* (_cache) {
      if (_cache == null) {
        return true;
      }
      this.body = _cache;
      return false;
    },
    evtName: 'clearIndexCache',
    destroy: RedisCache.destroy
  }
}));

app.use(function* () {
  this.body = {
    count: count++
  };
  if (count === 3) {
    count = 0;
    this.app.emit('clearIndexCache');
  }
});

app.listen(3000, function () {
  console.log('listening on 3000.');
});

Test

npm test

License

MIT