all files / lib/ changes.js

100% Statements 163/163
98.02% Branches 99/101
100% Functions 22/22
100% Lines 162/162
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'use strict';
 
Object.defineProperty(exports, "__esModule", {
  value: true
});
 
var _clone = require('./deps/clone');
 
var _clone2 = _interopRequireDefault(_clone);
 
var _promise = require('./deps/promise');
 
var _promise2 = _interopRequireDefault(_promise);
 
var _isDeleted = require('./deps/docs/isDeleted');
 
var _isDeleted2 = _interopRequireDefault(_isDeleted);
 
var _inherits = require('inherits');
 
var _inherits2 = _interopRequireDefault(_inherits);
 
var _argsarray = require('argsarray');
 
var _argsarray2 = _interopRequireDefault(_argsarray);
 
var _once = require('./deps/once');
 
var _once2 = _interopRequireDefault(_once);
 
var _events = require('events');
 
var _evalFilter = require('./evalFilter');
 
var _evalFilter2 = _interopRequireDefault(_evalFilter);
 
var _evalView = require('./evalView');
 
var _evalView2 = _interopRequireDefault(_evalView);
 
var _parseDdocFunctionName = require('./deps/docs/parseDdocFunctionName');
 
var _parseDdocFunctionName2 = _interopRequireDefault(_parseDdocFunctionName);
 
var _normalizeDdocFunctionName = require('./deps/docs/normalizeDdocFunctionName');
 
var _normalizeDdocFunctionName2 = _interopRequireDefault(_normalizeDdocFunctionName);
 
var _collectLeaves = require('./deps/merge/collectLeaves');
 
var _collectLeaves2 = _interopRequireDefault(_collectLeaves);
 
var _collectConflicts = require('./deps/merge/collectConflicts');
 
var _collectConflicts2 = _interopRequireDefault(_collectConflicts);
 
var _errors = require('./deps/errors');
 
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
 
(0, _inherits2.default)(Changes, _events.EventEmitter);
 
function Changes(db, opts, callback) {
  _events.EventEmitter.call(this);
  var self = this;
  this.db = db;
  opts = opts ? (0, _clone2.default)(opts) : {};
  var complete = opts.complete = (0, _once2.default)(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', callback);
  }
  function onDestroy() {
    self.cancel();
  }
  db.once('destroyed', onDestroy);
 
  opts.onChange = function (change) {
    /* istanbul ignore if */
    Iif (opts.isCancelled) {
      return;
    }
    self.emit('change', change);
    if (self.startSeq && self.startSeq <= change.seq) {
      self.startSeq = false;
    }
  };
 
  var promise = new _promise2.default(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 () {
      if (self.isCancelled) {
        self.emit('cancel');
      } else {
        self.doChanges(opts);
      }
    });
  } else {
    self.doChanges(opts);
  }
}
Changes.prototype.cancel = function () {
  this.isCancelled = true;
  if (this.db.taskqueue.isReady) {
    this.emit('cancel');
  }
};
function processChange(doc, metadata, opts) {
  var changeList = [{ rev: doc._rev }];
  if (opts.style === 'all_docs') {
    changeList = (0, _collectLeaves2.default)(metadata.rev_tree).map(function (x) {
      return { rev: x.rev };
    });
  }
  var change = {
    id: metadata.id,
    changes: changeList,
    doc: doc
  };
 
  if ((0, _isDeleted2.default)(metadata, doc._rev)) {
    change.deleted = true;
  }
  if (opts.conflicts) {
    change.doc._conflicts = (0, _collectConflicts2.default)(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 = (0, _clone2.default)(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) {
      /* istanbul ignore if */
      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;
      /* istanbul ignore next */
    }, 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 = (0, _normalizeDdocFunctionName2.default)(opts.view);
    } else {
      opts.filter = (0, _normalizeDdocFunctionName2.default)(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 = (0, _argsarray2.default)(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 = (0, _errors.createError)(_errors.BAD_REQUEST, '`view` filter parameter not found or invalid.');
      return callback(err);
    }
    // fetch a view from a design doc, make it behave like a filter
    var viewName = (0, _parseDdocFunctionName2.default)(opts.view);
    this.db.get('_design/' + viewName[0], function (err, ddoc) {
      /* istanbul ignore if */
      Iif (self.isCancelled) {
        return callback(null, { status: 'cancelled' });
      }
      /* istanbul ignore next */
      Iif (err) {
        return callback((0, _errors.generateErrorFromResponse)(err));
      }
      var mapFun = ddoc && ddoc.views && ddoc.views[viewName[1]] && ddoc.views[viewName[1]].map;
      if (!mapFun) {
        return callback((0, _errors.createError)(_errors.MISSING_DOC, ddoc.views ? 'missing json key: ' + viewName[1] : 'missing json key: views'));
      }
      opts.filter = (0, _evalView2.default)(mapFun);
      self.doChanges(opts);
    });
  } else {
    // fetch a filter from a design doc
    var filterName = (0, _parseDdocFunctionName2.default)(opts.filter);
    if (!filterName) {
      return self.doChanges(opts);
    }
    this.db.get('_design/' + filterName[0], function (err, ddoc) {
      /* istanbul ignore if */
      Iif (self.isCancelled) {
        return callback(null, { status: 'cancelled' });
      }
      /* istanbul ignore next */
      if (err) {
        return callback((0, _errors.generateErrorFromResponse)(err));
      }
      var filterFun = ddoc && ddoc.filters && ddoc.filters[filterName[1]];
      if (!filterFun) {
        return callback((0, _errors.createError)(_errors.MISSING_DOC, ddoc && ddoc.filters ? 'missing json key: ' + filterName[1] : 'missing json key: filters'));
      }
      opts.filter = (0, _evalFilter2.default)(filterFun);
      self.doChanges(opts);
    });
  }
};
 
exports.default = Changes;
module.exports = exports['default'];