47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
var async = require('async')
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//
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// Function performs a certain task on a multiple uplinks
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// and reverts changes if something fails
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//
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// uplinks - list of uplinks not counting local
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// localAction, localRollback - function(cb)
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// remoteAction, remoteRollback - function(uplink, cb)
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//
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module.exports = function(uplinks, localAction, localRollback, remoteAction, remoteRollback, callback) {
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var uplink_ids = uplinks.map(function(_, i) {
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return i
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})
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localAction(function(err) {
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if (err) return callback(err)
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async.map(uplink_ids, function(i, cb) {
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remoteAction(uplinks[i], function(err) {
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cb(null, err)
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})
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}, function(err, res) {
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var return_err = err
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// let err be first non-null element in the array
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for (var i=0; i<res.length; i++) {
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if (return_err) break
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return_err = res[i]
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}
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if (!return_err) return callback()
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async.map(uplink_ids, function(i, cb) {
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if (res[i]) return cb()
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remoteRollback(uplinks[i], function() {
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cb()
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})
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}, function(err) {
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localRollback(function() {
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callback(return_err)
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})
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})
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})
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})
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}
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