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import axios from "axios";
interface ChunkedRequest {
url: string,
parameters: object,
resolve(value: unknown): unknown,
reject(): unknown,
}
export default class ChunkedRequester
{
#requests: ChunkedRequest[] = [];
readonly #delay: number;
readonly #limit: number;
#timeout: ReturnType<typeof setTimeout>|undefined = undefined;
constructor(limit: number = 16, delay: number = 500) {
if (limit < 1) {
throw new Error('Limit must be positive');
}
this.#limit = limit;
this.#delay = delay;
}
addRequest(url: string, parameters: object = {}): Promise<unknown>
{
return new Promise((resolve, reject) => {
this.#requests.push({
url,
parameters,
resolve,
reject
});
this.#startRequests();
});
}
#startRequests(): void
{
if (this.#requests.length === 0) {
return;
}
if (this.#requests.length < this.#limit) {
this.clearTimeout();
}
if (this.#timeout !== undefined) {
return;
}
this.#timeout = setTimeout(
() => {
Promise.all(
this.#requests
.splice(0, this.#limit)
.map(({url, parameters, resolve, reject}) => {
return axios.get(url, {params: parameters}).then(resolve, reject);
})
).then(() => {
this.clearTimeout();
this.#startRequests();
});
}
, this.#delay
);
}
clearTimeout(): void
{
clearTimeout(this.#timeout);
this.#timeout = undefined;
}
}
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