[6a3a178] | 1 | var RetryOperation = require('./retry_operation');
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| 2 |
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| 3 | exports.operation = function(options) {
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| 4 | var timeouts = exports.timeouts(options);
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| 5 | return new RetryOperation(timeouts, {
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| 6 | forever: options && options.forever,
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| 7 | unref: options && options.unref,
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| 8 | maxRetryTime: options && options.maxRetryTime
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| 9 | });
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| 10 | };
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| 11 |
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| 12 | exports.timeouts = function(options) {
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| 13 | if (options instanceof Array) {
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| 14 | return [].concat(options);
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| 15 | }
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| 16 |
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| 17 | var opts = {
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| 18 | retries: 10,
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| 19 | factor: 2,
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| 20 | minTimeout: 1 * 1000,
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| 21 | maxTimeout: Infinity,
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| 22 | randomize: false
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| 23 | };
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| 24 | for (var key in options) {
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| 25 | opts[key] = options[key];
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| 26 | }
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| 27 |
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| 28 | if (opts.minTimeout > opts.maxTimeout) {
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| 29 | throw new Error('minTimeout is greater than maxTimeout');
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| 30 | }
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| 31 |
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| 32 | var timeouts = [];
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| 33 | for (var i = 0; i < opts.retries; i++) {
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| 34 | timeouts.push(this.createTimeout(i, opts));
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| 35 | }
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| 36 |
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| 37 | if (options && options.forever && !timeouts.length) {
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| 38 | timeouts.push(this.createTimeout(i, opts));
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| 39 | }
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| 40 |
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| 41 | // sort the array numerically ascending
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| 42 | timeouts.sort(function(a,b) {
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| 43 | return a - b;
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| 44 | });
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| 45 |
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| 46 | return timeouts;
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| 47 | };
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| 48 |
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| 49 | exports.createTimeout = function(attempt, opts) {
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| 50 | var random = (opts.randomize)
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| 51 | ? (Math.random() + 1)
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| 52 | : 1;
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| 53 |
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| 54 | var timeout = Math.round(random * opts.minTimeout * Math.pow(opts.factor, attempt));
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| 55 | timeout = Math.min(timeout, opts.maxTimeout);
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| 56 |
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| 57 | return timeout;
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| 58 | };
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| 59 |
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| 60 | exports.wrap = function(obj, options, methods) {
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| 61 | if (options instanceof Array) {
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| 62 | methods = options;
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| 63 | options = null;
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| 64 | }
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| 65 |
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| 66 | if (!methods) {
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| 67 | methods = [];
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| 68 | for (var key in obj) {
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| 69 | if (typeof obj[key] === 'function') {
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| 70 | methods.push(key);
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| 71 | }
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| 72 | }
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| 73 | }
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| 74 |
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| 75 | for (var i = 0; i < methods.length; i++) {
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| 76 | var method = methods[i];
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| 77 | var original = obj[method];
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| 78 |
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| 79 | obj[method] = function retryWrapper(original) {
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| 80 | var op = exports.operation(options);
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| 81 | var args = Array.prototype.slice.call(arguments, 1);
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| 82 | var callback = args.pop();
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| 83 |
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| 84 | args.push(function(err) {
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| 85 | if (op.retry(err)) {
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| 86 | return;
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| 87 | }
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| 88 | if (err) {
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| 89 | arguments[0] = op.mainError();
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| 90 | }
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| 91 | callback.apply(this, arguments);
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| 92 | });
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| 93 |
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| 94 | op.attempt(function() {
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| 95 | original.apply(obj, args);
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| 96 | });
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| 97 | }.bind(obj, original);
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| 98 | obj[method].options = options;
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| 99 | }
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| 100 | };
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