114 lines
3.4 KiB
JavaScript
114 lines
3.4 KiB
JavaScript
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'use strict';
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var util = require('util');
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var format = util.format;
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function TimeoutError(message, err) {
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Error.call(this);
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Error.captureStackTrace(this, TimeoutError);
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this.name = 'TimeoutError';
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this.message = message;
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this.previous = err;
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}
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util.inherits(TimeoutError, Error);
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function matches(match, err) {
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if (match === true) return true;
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if (typeof match === 'function') {
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try {
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if (err instanceof match) return true;
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} catch (_) {
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return !!match(err);
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}
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}
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if (match === err.toString()) return true;
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if (match === err.message) return true;
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return match instanceof RegExp
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&& (match.test(err.message) || match.test(err.toString()));
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}
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module.exports = function retryAsPromised(callback, options) {
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if (!callback || !options) {
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throw new Error(
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'retry-as-promised must be passed a callback and a options set or a number'
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);
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}
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if (typeof options === 'number') {
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options = {
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max: options
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};
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}
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// Super cheap clone
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options = {
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$current: options.$current || 1,
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max: options.max,
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timeout: options.timeout || undefined,
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match: options.match || [],
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backoffBase: options.backoffBase === undefined ? 100 : options.backoffBase,
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backoffExponent: options.backoffExponent || 1.1,
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report: options.report || function () {},
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name: options.name || callback.name || 'unknown'
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};
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if (!Array.isArray(options.match)) options.match = [options.match];
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options.report('Trying ' + options.name + ' #' + options.$current + ' at ' + new Date().toLocaleTimeString(), options);
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return new Promise(function(resolve, reject) {
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var timeout, backoffTimeout, lastError;
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if (options.timeout) {
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timeout = setTimeout(function() {
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if (backoffTimeout) clearTimeout(backoffTimeout);
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reject(new TimeoutError(options.name + ' timed out', lastError));
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}, options.timeout);
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}
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Promise.resolve(callback({ current: options.$current }))
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.then(resolve)
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.then(function() {
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if (timeout) clearTimeout(timeout);
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if (backoffTimeout) clearTimeout(backoffTimeout);
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})
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.catch(function(err) {
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if (timeout) clearTimeout(timeout);
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if (backoffTimeout) clearTimeout(backoffTimeout);
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lastError = err;
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options.report((err && err.toString()) || err, options);
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// Should not retry if max has been reached
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var shouldRetry = options.$current < options.max;
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if (!shouldRetry) return reject(err);
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shouldRetry = options.match.length === 0 || options.match.some(function (match) {
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return matches(match, err)
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});
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if (!shouldRetry) return reject(err);
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var retryDelay = options.backoffBase * Math.pow(options.backoffExponent, options.$current - 1);
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// Do some accounting
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options.$current++;
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options.report(format('Retrying %s (%s)', options.name, options.$current), options);
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if (retryDelay) {
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// Use backoff function to ease retry rate
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options.report(format('Delaying retry of %s by %s', options.name, retryDelay), options);
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backoffTimeout = setTimeout(function() {
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retryAsPromised(callback, options)
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.then(resolve)
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.catch(reject);
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}, retryDelay);
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} else {
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retryAsPromised(callback, options)
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.then(resolve)
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.catch(reject);
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}
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});
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});
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};
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module.exports.TimeoutError = TimeoutError;
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