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JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.callLimit = void 0;
const os = __importStar(require("node:os"));
// availableParallelism available only since node v19, for older versions use
// cpus() cpus() can return an empty list if /proc is not mounted, use 1 in
// this case
/* c8 ignore start */
const defLimit = 'availableParallelism' in os
? Math.max(1, os.availableParallelism() - 1)
: Math.max(1, os.cpus().length - 1);
const callLimit = (queue, { limit = defLimit, rejectLate } = {}) => new Promise((res, rej) => {
let active = 0;
let current = 0;
const results = [];
// Whether or not we rejected, distinct from the rejection just in case the rejection itself is falsey
let rejected = false;
let rejection;
const reject = (er) => {
if (rejected)
return;
rejected = true;
rejection ??= er;
if (!rejectLate)
rej(rejection);
};
let resolved = false;
const resolve = () => {
if (resolved || active > 0)
return;
resolved = true;
res(results);
};
const run = () => {
const c = current++;
if (c >= queue.length)
return rejected ? reject() : resolve();
active++;
const step = queue[c];
/* c8 ignore start */
if (!step)
throw new Error('walked off queue');
/* c8 ignore stop */
results[c] = step()
.then(result => {
active--;
results[c] = result;
return result;
}, er => {
active--;
reject(er);
})
.then(result => {
if (rejected && active === 0)
return rej(rejection);
run();
return result;
});
};
for (let i = 0; i < limit; i++)
run();
});
exports.callLimit = callLimit;
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