1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | 1 1 1 1 1 1 1 130 16 16 130 102 130 130 130 130 130 1 130 130 130 130 1 20 1 32 1 2 1 2 130 130 1 260 1504 1504 1504 32 16 32 32 16 130 12 12 130 240 16 16 224 2 2 130 232 16 16 130 130 130 114 114 114 12 114 114 16 16 4 12 8 8 4 130 46 130 8 1 60 56 56 56 | 'use strict'; var utils = require('./utils'); var replication = require('./replicate'); var replicate = replication.replicate; var EE = require('events').EventEmitter; utils.inherits(Sync, EE); module.exports = sync; function sync(src, target, opts, callback) { if (typeof opts === 'function') { callback = opts; opts = {}; } if (typeof opts === 'undefined') { opts = {}; } opts = utils.clone(opts); /*jshint validthis:true */ opts.PouchConstructor = opts.PouchConstructor || this; src = replication.toPouch(src, opts); target = replication.toPouch(target, opts); return new Sync(src, target, opts, callback); } function Sync(src, target, opts, callback) { var self = this; this.canceled = false; this.push = replicate(src, target, opts); this.pull = replicate(target, src, opts); function pullChange(change) { self.emit('change', { direction: 'pull', change: change }); } function pushChange(change) { self.emit('change', { direction: 'push', change: change }); } function pushDenied(doc) { self.emit('denied', { direction: 'push', doc: doc }); } function pullDenied(doc) { self.emit('denied', { direction: 'pull', doc: doc }); } var listeners = {}; var removed = {}; function removeAll(type) { // type is 'push' or 'pull' return function (event, func) { var isChange = event === 'change' && (func === pullChange || func === pushChange); var isOtherEvent = event in listeners; if (isChange || isOtherEvent) { if (!(event in removed)) { removed[event] = {}; } removed[event][type] = true; if (Object.keys(removed[event]).length === 2) { // both push and pull have asked to be removed self.removeAllListeners(event); } } }; } if (opts.live) { this.push.on('complete', self.pull.cancel.bind(self.pull)); this.pull.on('complete', self.push.cancel.bind(self.push)); } this.on('newListener', function (event) { if (event === 'change') { self.pull.on('change', pullChange); self.push.on('change', pushChange); } else if (event === 'denied') { self.pull.on('denied', pullDenied); self.push.on('denied', pushDenied); } }); this.on('removeListener', function (event) { if (event === 'change') { self.pull.removeListener('change', pullChange); self.push.removeListener('change', pushChange); } }); this.pull.on('removeListener', removeAll('pull')); this.push.on('removeListener', removeAll('push')); var promise = utils.Promise.all([ this.push, this.pull ]).then(function (resp) { var out = { push: resp[0], pull: resp[1] }; self.emit('complete', out); if (callback) { callback(null, out); } self.removeAllListeners(); return out; }, function (err) { self.cancel(); if (callback) { // if there's a callback, then the callback can receive // the error event callback(err); } else { // if there's no callback, then we're safe to emit an error // event, which would otherwise throw an unhandled error // due to 'error' being a special event in EventEmitters self.emit('error', err); } self.removeAllListeners(); if (callback) { // no sense throwing if we're already emitting an 'error' event throw err; } }); this.then = function (success, err) { return promise.then(success, err); }; this.catch = function (err) { return promise.catch(err); }; } Sync.prototype.cancel = function () { if (!this.canceled) { this.canceled = true; this.push.cancel(); this.pull.cancel(); } }; |