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_abstract.js
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_abstract.js
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define(function (require) {
let _ = require('lodash');
let angular = require('angular');
return function SourceAbstractFactory(Private, Promise, PromiseEmitter) {
let requestQueue = Private(require('ui/courier/_request_queue'));
let errorHandlers = Private(require('ui/courier/_error_handlers'));
let courierFetch = Private(require('ui/courier/fetch/fetch'));
function SourceAbstract(initialState, strategy) {
let self = this;
self._instanceid = _.uniqueId('data_source');
self._state = (function () {
// state can be serialized as JSON, and passed back in to restore
if (initialState) {
if (typeof initialState === 'string') {
return JSON.parse(initialState);
} else {
return _.cloneDeep(initialState);
}
} else {
return {};
}
}());
// set internal state values
self._methods.forEach(function (name) {
self[name] = function (val) {
if (val == null) {
delete self._state[name];
} else {
self._state[name] = val;
}
return self;
};
});
self.history = [];
self._fetchStrategy = strategy;
}
/*****
* PUBLIC API
*****/
/**
* Get values from the state
* @param {string} name - The name of the property desired
* @return {any} - the value found
*/
SourceAbstract.prototype.get = function (name) {
let self = this;
while (self) {
if (self._state[name] !== void 0) return self._state[name];
self = self.getParent();
}
};
/**
* Get the value from our own state, don't traverse up the chain
* @param {string} name - The name of the property desired
* @return {any} - the value found
*/
SourceAbstract.prototype.getOwn = function (name) {
if (this._state[name] !== void 0) return this._state[name];
};
/**
* Change the entire state of a SourceAbstract
* @param {object|string} state - The SourceAbstract's new state, or a
* string of the state value to set
*/
SourceAbstract.prototype.set = function (state, val) {
let self = this;
if (typeof state === 'string') {
// the getter and setter methods check for undefined explicitly
// to identify getters and null to identify deletion
if (val === undefined) {
val = null;
}
self[state](val);
} else {
self._state = state;
}
return self;
};
/**
* Create a new dataSource object of the same type
* as this, which inherits this dataSource's properties
* @return {SourceAbstract}
*/
SourceAbstract.prototype.extend = function () {
return (new this.Class()).inherits(this);
};
/**
* return a simple, encodable object representing the state of the SourceAbstract
* @return {[type]} [description]
*/
SourceAbstract.prototype.toJSON = function () {
return _.clone(this._state);
};
/**
* Create a string representation of the object
* @return {[type]} [description]
*/
SourceAbstract.prototype.toString = function () {
return angular.toJson(this.toJSON());
};
/**
* Put a request in to the courier that this Source should
* be fetched on the next run of the courier
* @return {Promise}
*/
SourceAbstract.prototype.onResults = function (handler) {
let self = this;
return new PromiseEmitter(function (resolve, reject) {
const defer = Promise.defer();
defer.promise.then(resolve, reject);
self._createRequest(defer);
}, handler);
};
/**
* Noop
*/
SourceAbstract.prototype.getParent = function () {
return this._parent;
};
/**
* similar to onResults, but allows a seperate loopy code path
* for error handling.
*
* @return {Promise}
*/
SourceAbstract.prototype.onError = function (handler) {
let self = this;
return new PromiseEmitter(function (resolve, reject) {
const defer = Promise.defer();
defer.promise.then(resolve, reject);
errorHandlers.push({
source: self,
defer: defer
});
}, handler);
};
/**
* Fetch just this source ASAP
*
* ONLY USE IF YOU WILL BE USING THE RESULTS
* provided by the returned promise, otherwise
* call #fetchQueued()
*
* @async
*/
SourceAbstract.prototype.fetch = function () {
let self = this;
let req = _.first(self._myStartableQueued());
if (!req) {
req = self._createRequest();
}
courierFetch.these([req]);
return req.defer.promise;
};
/**
* Fetch all pending requests for this source ASAP
* @async
*/
SourceAbstract.prototype.fetchQueued = function () {
return courierFetch.these(this._myStartableQueued());
};
/**
* Cancel all pending requests for this dataSource
* @return {undefined}
*/
SourceAbstract.prototype.cancelQueued = function () {
requestQueue
.get(this._fetchStrategy)
.filter(req => req.source === this)
.forEach(req => req.abort());
};
/**
* Completely destroy the SearchSource.
* @return {undefined}
*/
SourceAbstract.prototype.destroy = function () {
this.cancelQueued();
};
/*****
* PRIVATE API
*****/
SourceAbstract.prototype._myStartableQueued = function () {
return requestQueue
.getStartable(this._fetchStrategy)
.filter(req => req.source === this);
};
SourceAbstract.prototype._createRequest = function () {
throw new Error('_createRequest must be implemented by subclass');
};
/**
* Walk the inheritance chain of a source and return it's
* flat representaion (taking into account merging rules)
* @returns {Promise}
* @resolved {Object|null} - the flat state of the SourceAbstract
*/
SourceAbstract.prototype._flatten = function () {
let type = this._getType();
// the merged state of this dataSource and it's ancestors
let flatState = {};
// function used to write each property from each state object in the chain to flat state
let root = this;
// start the chain at this source
let current = this;
// call the ittr and return it's promise
return (function ittr() {
// itterate the _state object (not array) and
// pass each key:value pair to source._mergeProp. if _mergeProp
// returns a promise, then wait for it to complete and call _mergeProp again
return Promise.all(_.map(current._state, function ittr(value, key) {
if (Promise.is(value)) {
return value.then(function (value) {
return ittr(value, key);
});
}
let prom = root._mergeProp(flatState, value, key);
return Promise.is(prom) ? prom : null;
}))
.then(function () {
// move to this sources parent
let parent = current.getParent();
// keep calling until we reach the top parent
if (parent) {
current = parent;
return ittr();
}
});
}())
.then(function () {
if (type === 'search') {
// This is down here to prevent the circular dependency
let decorateQuery = Private(require('ui/courier/data_source/_decorate_query'));
flatState.body = flatState.body || {};
// defaults for the query
if (!flatState.body.query) {
flatState.body.query = {
'match_all': {}
};
}
if (flatState.body.size === 0) {
flatState.search_type = 'count';
} else {
let computedFields = flatState.index.getComputedFields();
flatState.body.fields = computedFields.fields;
flatState.body.script_fields = flatState.body.script_fields || {};
flatState.body.fielddata_fields = flatState.body.fielddata_fields || [];
_.extend(flatState.body.script_fields, computedFields.scriptFields);
flatState.body.fielddata_fields = _.union(flatState.body.fielddata_fields, computedFields.fielddataFields);
}
decorateQuery(flatState.body.query);
/**
* Create a filter that can be reversed for filters with negate set
* @param {boolean} reverse This will reverse the filter. If true then
* anything where negate is set will come
* through otherwise it will filter out
* @returns {function}
*/
let filterNegate = function (reverse) {
return function (filter) {
if (_.isUndefined(filter.meta) || _.isUndefined(filter.meta.negate)) return !reverse;
return filter.meta && filter.meta.negate === reverse;
};
};
/**
* Clean out any invalid attributes from the filters
* @param {object} filter The filter to clean
* @returns {object}
*/
let cleanFilter = function (filter) {
return _.omit(filter, ['meta']);
};
// switch to filtered query if there are filters
if (flatState.filters) {
if (flatState.filters.length) {
_.each(flatState.filters, function (filter) {
if (filter.query) {
decorateQuery(filter.query);
}
});
flatState.body.query = {
filtered: {
query: flatState.body.query,
filter: {
bool: {
must: _(flatState.filters).filter(filterNegate(false)).map(cleanFilter).value(),
must_not: _(flatState.filters).filter(filterNegate(true)).map(cleanFilter).value()
}
}
}
};
}
delete flatState.filters;
}
}
return flatState;
});
};
return SourceAbstract;
};
});