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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 | 1 1 1 1 1 1 1 1 1 1 7731 7731 7731 7731 7731 7729 13 7716 7729 7729 7731 4 4 4 1 2 7731 7731 13712 13712 13712 223 13712 423 13289 7447 5842 7731 7731 7807 13 7794 7731 382 382 7731 7731 7731 7716 7731 45 45 45 7686 1 675 675 675 1 10927 10927 5449 6170 10927 10927 364 10927 3760 3760 3728 10927 1 7781 7781 7781 7781 357 7781 7781 2 7781 5488 7781 6 6 6 6 6 7775 364 364 7775 104 22 82 104 50 7725 7683 7725 7725 7725 7725 7725 7725 675 675 1 50 50 50 11 1 1 1 10 10 10 10 10 10 8 8 8 8 2 2 2 2 2 39 39 39 39 39 1 1 38 36 36 36 36 2 2 2 2 2 | 'use strict'; var utils = require('./utils'); var isDeleted = require('./deps/docs/isDeleted'); var merge = require('./merge'); var errors = require('./deps/errors'); var EE = require('events').EventEmitter; var evalFilter = require('./evalFilter'); var evalView = require('./evalView'); module.exports = Changes; utils.inherits(Changes, EE); function Changes(db, opts, callback) { EE.call(this); var self = this; this.db = db; opts = opts ? utils.clone(opts) : {}; var complete = opts.complete = utils.once(function (err, resp) { if (err) { self.emit('error', err); } else { self.emit('complete', resp); } self.removeAllListeners(); db.removeListener('destroyed', onDestroy); }); if (callback) { self.on('complete', function (resp) { callback(null, resp); }); self.on('error', function (err) { callback(err); }); } function onDestroy() { self.cancel(); } db.once('destroyed', onDestroy); opts.onChange = function (change) { Iif (opts.isCancelled) { return; } self.emit('change', change); if (self.startSeq && self.startSeq <= change.seq) { self.startSeq = false; } if (change.deleted) { self.emit('delete', change); } else if (change.changes.length === 1 && change.changes[0].rev.slice(0, 2) === '1-') { self.emit('create', change); } else { self.emit('update', change); } }; var promise = new utils.Promise(function (fulfill, reject) { opts.complete = function (err, res) { if (err) { reject(err); } else { fulfill(res); } }; }); self.once('cancel', function () { db.removeListener('destroyed', onDestroy); opts.complete(null, {status: 'cancelled'}); }); this.then = promise.then.bind(promise); this['catch'] = promise['catch'].bind(promise); this.then(function (result) { complete(null, result); }, complete); if (!db.taskqueue.isReady) { db.taskqueue.addTask(function () { Iif (self.isCancelled) { self.emit('cancel'); } else { self.doChanges(opts); } }); } else { self.doChanges(opts); } } Changes.prototype.cancel = function () { this.isCancelled = true; Eif (this.db.taskqueue.isReady) { this.emit('cancel'); } }; function processChange(doc, metadata, opts) { var changeList = [{rev: doc._rev}]; if (opts.style === 'all_docs') { changeList = merge.collectLeaves(metadata.rev_tree) .map(function (x) { return {rev: x.rev}; }); } var change = { id: metadata.id, changes: changeList, doc: doc }; if (isDeleted(metadata, doc._rev)) { change.deleted = true; } if (opts.conflicts) { change.doc._conflicts = merge.collectConflicts(metadata); if (!change.doc._conflicts.length) { delete change.doc._conflicts; } } return change; } Changes.prototype.doChanges = function (opts) { var self = this; var callback = opts.complete; opts = utils.clone(opts); if ('live' in opts && !('continuous' in opts)) { opts.continuous = opts.live; } opts.processChange = processChange; if (opts.since === 'latest') { opts.since = 'now'; } if (!opts.since) { opts.since = 0; } if (opts.since === 'now') { this.db.info().then(function (info) { Iif (self.isCancelled) { callback(null, {status: 'cancelled'}); return; } opts.since = info.update_seq; self.doChanges(opts); }, callback); return; } if (opts.continuous && opts.since !== 'now') { this.db.info().then(function (info) { self.startSeq = info.update_seq; }, function (err) { if (err.id === 'idbNull') { //db closed before this returned //thats ok return; } throw err; }); } if (opts.filter && typeof opts.filter === 'string') { if (opts.filter === '_view') { opts.view = utils.normalizeDesignDocFunctionName(opts.view); } else { opts.filter = utils.normalizeDesignDocFunctionName(opts.filter); } if (this.db.type() !== 'http' && !opts.doc_ids) { return this.filterChanges(opts); } } if (!('descending' in opts)) { opts.descending = false; } // 0 and 1 should return 1 document opts.limit = opts.limit === 0 ? 1 : opts.limit; opts.complete = callback; var newPromise = this.db._changes(opts); Eif (newPromise && typeof newPromise.cancel === 'function') { var cancel = self.cancel; self.cancel = utils.getArguments(function (args) { newPromise.cancel(); cancel.apply(this, args); }); } }; Changes.prototype.filterChanges = function (opts) { var self = this; var callback = opts.complete; if (opts.filter === '_view') { if (!opts.view || typeof opts.view !== 'string') { var err = errors.error(errors.BAD_REQUEST, '`view` filter parameter is not provided.'); callback(err); return; } // fetch a view from a design doc, make it behave like a filter var viewName = utils.parseDesignDocFunctionName(opts.view); Iif (!viewName) { callback(errors.error(errors.BAD_REQUEST, '`view` filter parameter invalid.')); return; } this.db.get('_design/' + viewName[0], function (err, ddoc) { Iif (self.isCancelled) { callback(null, {status: 'cancelled'}); return; } Iif (err) { callback(errors.generateErrorFromResponse(err)); return; } if (ddoc && ddoc.views && ddoc.views[viewName[1]]) { var filter = evalView(ddoc.views[viewName[1]].map); opts.filter = filter; self.doChanges(opts); return; } var msg = ddoc.views ? 'missing json key: ' + viewName[1] : 'missing json key: views'; Eif (!err) { err = errors.error(errors.MISSING_DOC, msg); } callback(err); return; }); } else { // fetch a filter from a design doc var filterName = utils.parseDesignDocFunctionName(opts.filter); Iif (!filterName) { callback(errors.error(errors.BAD_REQUEST, '`filter` filter parameter invalid.')); return; } this.db.get('_design/' + filterName[0], function (err, ddoc) { Iif (self.isCancelled) { callback(null, {status: 'cancelled'}); return; } if (err) { callback(errors.generateErrorFromResponse(err)); return; } if (ddoc && ddoc.filters && ddoc.filters[filterName[1]]) { var filter = evalFilter(ddoc.filters[filterName[1]]); opts.filter = filter; self.doChanges(opts); return; } else { var msg = (ddoc && ddoc.filters) ? 'missing json key: ' + filterName[1] : 'missing json key: filters'; Eif (!err) { err = errors.error(errors.MISSING_DOC, msg); } callback(err); return; } }); } }; |