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verdaccio/lib/transaction.js

55 lines
1.3 KiB
JavaScript

var async = require('async')
//
// Function performs a certain task on a multiple uplinks
// and reverts changes if something fails
//
// uplinks - list of uplinks not counting local
// localAction, localRollback - function(cb)
// remoteAction, remoteRollback - function(uplink, cb)
//
module.exports = function(uplinks, localAction, localRollback, remoteAction, remoteRollback, callback) {
var uplink_ids = uplinks.map(function(_, i) {
return i
})
// localAction is first for the two reasons:
// 1. local error is much faster to detect, so we won't bother uplinks in these cases
// 2. we can handle looping cases correctly this way
localAction(function(err) {
if (err) {
err.uplink = 'local'
return callback(err)
}
async.map(uplink_ids, function(i, cb) {
remoteAction(uplinks[i], function(err) {
cb(null, err)
})
}, function(err, res) {
var return_err = err
// let err be first non-null element in the array
for (var i=0; i<res.length; i++) {
if (return_err) break
if (res[i]) {
return_err = res[i]
return_err.uplink = i
}
}
if (!return_err) return callback()
async.map(uplink_ids, function(i, cb) {
if (res[i]) return cb()
remoteRollback(uplinks[i], function() {
cb()
})
}, function(err) {
localRollback(function() {
callback(return_err)
})
})
})
})
}