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cached-http.js
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cached-http.js
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const axios = require("axios");
const CancelToken = axios.CancelToken;
const url = require("url");
const merge = require("merge");
const Promise = require("bluebird");
const qs = require("qs");
Promise.config({ cancellation: true });
function CachedError() {}
CachedError.prototype = Error.prototype;
function respond_from_cache(value) {
return Promise[value instanceof CachedError ? "reject" : "resolve"](value);
}
const CachedHttp = (function() {
let cache = {};
var pending = {};
return {
get: function(url_arg, query, options) {
const parsed_url = url.parse(url_arg, true);
delete parsed_url.search;
const merged_query = merge(true, parsed_url.query, query);
const { pathname } = parsed_url;
const hash = pathname + "|" + JSON.stringify(merged_query);
if (pending[hash]) {
return Promise.resolve(pending[hash]).finally(() =>
respond_from_cache(cache[hash])
);
}
if (cache[hash]) {
return respond_from_cache(cache[hash]);
}
const promise = new Promise((resolve, reject, onCancel) => {
const source = CancelToken.source();
onCancel(function() {
delete cache[hash];
delete pending[hash];
source.cancel();
});
return axios
.get(`${pathname}?${qs.stringify(merged_query)}`, {
cancelToken: source.token,
options,
})
.then(response => {
const data = response.data;
cache[hash] = response.data;
delete pending[hash];
resolve(data);
})
.catch(error => {
const cached_err = Object.create(CachedError.prototype);
Object.assign(cached_err, error);
delete pending[hash];
cache[hash] = cached_err;
reject(cached_err);
});
});
pending[hash] = promise.then(respond_from_cache).catch(() => {});
return promise;
},
flush: function() {
//resets cache
cache = {};
},
};
})();
module.exports = CachedHttp;

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