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101 lines
2.3 KiB
101 lines
2.3 KiB
var RetryOperation = require('./retry_operation');
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exports.operation = function(options) {
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var timeouts = exports.timeouts(options);
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return new RetryOperation(timeouts, {
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forever: options && (options.forever || options.retries === Infinity),
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unref: options && options.unref,
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maxRetryTime: options && options.maxRetryTime
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});
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};
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exports.timeouts = function(options) {
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if (options instanceof Array) {
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return [].concat(options);
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}
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var opts = {
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retries: 10,
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factor: 2,
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minTimeout: 1 * 1000,
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maxTimeout: Infinity,
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randomize: false
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};
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for (var key in options) {
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opts[key] = options[key];
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}
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if (opts.minTimeout > opts.maxTimeout) {
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throw new Error('minTimeout is greater than maxTimeout');
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}
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var timeouts = [];
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for (var i = 0; i < opts.retries; i++) {
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timeouts.push(this.createTimeout(i, opts));
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}
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if (options && options.forever && !timeouts.length) {
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timeouts.push(this.createTimeout(i, opts));
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}
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// sort the array numerically ascending
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timeouts.sort(function(a,b) {
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return a - b;
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});
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return timeouts;
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};
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exports.createTimeout = function(attempt, opts) {
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var random = (opts.randomize)
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? (Math.random() + 1)
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: 1;
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var timeout = Math.round(random * Math.max(opts.minTimeout, 1) * Math.pow(opts.factor, attempt));
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timeout = Math.min(timeout, opts.maxTimeout);
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return timeout;
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};
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exports.wrap = function(obj, options, methods) {
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if (options instanceof Array) {
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methods = options;
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options = null;
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}
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if (!methods) {
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methods = [];
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for (var key in obj) {
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if (typeof obj[key] === 'function') {
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methods.push(key);
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}
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}
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}
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for (var i = 0; i < methods.length; i++) {
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var method = methods[i];
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var original = obj[method];
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obj[method] = function retryWrapper(original) {
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var op = exports.operation(options);
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var args = Array.prototype.slice.call(arguments, 1);
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var callback = args.pop();
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args.push(function(err) {
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if (op.retry(err)) {
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return;
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}
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if (err) {
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arguments[0] = op.mainError();
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}
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callback.apply(this, arguments);
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});
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op.attempt(function() {
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original.apply(obj, args);
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});
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}.bind(obj, original);
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obj[method].options = options;
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}
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};
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