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@WebMaestroFr /api.js
Last active Jan 10, 2018

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JavaScript Client for Public API
export function paramsString(args) {
return Object
.keys(args)
.map(k => `${encodeURIComponent(k)}=${encodeURIComponent(args[k])}`)
.join('&');
}
// localStorage.clear();
export class APIRequest {
constructor(resolve, reject, url, init) {
this.resolve = resolve;
this.reject = reject;
this.url = url;
this.init = init;
this.isCanceled = false;
}
fetch() {
return fetch(this.url, this.init).then(
response => response.status === 200
? response.json().then(this.resolve, this.reject)
: this.reject(`[${response.status}] ${this.url}`),
this.reject
)
}
cancel() {
this.isCanceled = true;
this.reject(`[CANCEL] ${this.url}`);
}
}
export default class API {
constructor(base, params = {}, interval = 0) {
this.base = base;
this.params = params;
this.interval = interval;
this.queue = [];
this.isProcessing = false;
}
_process() {
this.queue = this
.queue
.filter(r => !r.isCanceled);
const request = this
.queue
.shift();
if (request === undefined) {
this.isProcessing = false;
} else {
this.isProcessing = true;
request
.fetch()
.then(() => setTimeout(() => this._process(), this.interval));
}
}
_queue(request) {
this
.queue
.push(request);
if (!this.isProcessing) {
this._process();
}
}
fetch(path, filters = {}, expiration = 0, init = {}) {
let request = null;
const timestamp = Date.now(),
params = paramsString({
...this.params,
...filters
}),
url = `${this.base}/${path}?${params}`,
item = localStorage.getItem(url),
cache = item
? JSON.parse(item)
: null;
const promise = (cache && timestamp - cache.timestamp < expiration * 1000)
? Promise
.resolve(cache.data)
.then(data => {
// console.log(`[CACHE] ${url}`);
return data;
})
: new Promise((resolve, reject) => {
request = new APIRequest(data => {
if (expiration) {
const content = JSON.stringify({data, timestamp})
localStorage.setItem(url, content);
}
// console.log(`[FETCH] ${url}`);
return resolve(data);
}, reject, url, init);
this._queue(request);
});
return {
cancel: () => request
? request.cancel()
: null,
// done: (callback) => promise.then(callback, console.warn)
done: (callback) => promise.then(callback, () => null)
};
}
get(path, filters = {}, expiration = 0, init = {}) {
return this.fetch(path, filters, expiration, {
...init,
method: 'GET'
});
}
post(path, filters = {}, expiration = 0, init = {}) {
return this.fetch(path, filters, expiration, {
...init,
method: 'POST'
});
}
}
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