| 1 | /**
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| 2 | * helper to wait for all callbacks to complete; similar to `Promise.all`
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| 3 | * exposed to metrics object for unit tests
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| 4 | * @param {Array} requests
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| 5 | * @param {Function} handler
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| 6 | * @param {Function} callback
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| 7 | */
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| 8 | exports.async_all = function(requests, handler, callback) {
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| 9 | var total = requests.length,
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| 10 | errors = null,
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| 11 | results = [],
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| 12 | done = function (err, result) {
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| 13 | if (err) {
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| 14 | // errors are `null` unless there is an error, which allows for promisification
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| 15 | errors = errors || [];
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| 16 | errors.push(err);
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| 17 | }
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| 18 | results.push(result);
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| 19 | if (--total === 0) {
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| 20 | callback(errors, results)
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| 21 | }
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| 22 | };
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| 23 |
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| 24 | if (total === 0) {
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| 25 | callback(errors, results);
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| 26 | } else {
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| 27 | for(var i = 0, l = requests.length; i < l; i++) {
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| 28 | handler(requests[i], done);
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| 29 | }
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| 30 | }
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| 31 | };
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