Simple fetch cache.

See test.js for use cases.

• Install the package
• Run tests

npm install
node test.js

const { fetch, options } = require('./fetch-cache/index.js');

//  set timeout 2 sec
options.cache_timeout = 2000;

const foo = await fetch('https://github.com');
const bar = await fetch('https://github.com'); // cached response

• fetch(url, options) - setup timeout with fetch_timeout and call cache(fetch_upstream, url, wrap_options(options)).
• cache(fetch, url, options) - check if url is cached and return the cached response, or call fetch otherwise and cache the response.
  • If request_filter(url, options) returns false, just call fetch and return the response.
  • If response_filter(response) returns false, don't cache the response.
• clear() - clear the cache.

• fetch_upstream - upstream fetch function. Default is require('node-fetch').
• fetch_timeout - fetch timeout in milliseconds. Default is 10000.
• cache_timeout - cache timeout in milliseconds. Default is 5000.
• request_filter - request filter function. By default, only GET request responses are cached.
• response_filter - response filter function. By default, only responses with status 200 OK are cached.
• wrap_options - wrap request options function. By default, don't change request options.
• autoclean_count - how many cache responses to check for timeout when cache is called. Default is 20.

• btc Bitcoin bc1qau5y9wf49ammclhscuelwlm6370d9lqph6g9um
• btc Bitcoin (Legacy) 369h9iMSq8ihjYMwdwhbn2ffXMrprHvxav
• eth Ethereum 0x98556fb56e3079696738579dBE70a5Fa761110b9