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wiki/server/libs/search.js

211 lines
4.7 KiB

'use strict'
/* global winston */
const Promise = require('bluebird')
const _ = require('lodash')
const searchIndex = require('./search-index')
const stopWord = require('stopword')
const streamToPromise = require('stream-to-promise')
module.exports = {
_si: null,
_isReady: false,
/**
* Initialize search index
*
* @return {undefined} Void
*/
init () {
let self = this
self._isReady = new Promise((resolve, reject) => {
searchIndex({
deletable: true,
fieldedSearch: true,
indexPath: 'wiki',
logLevel: 'error',
stopwords: _.get(stopWord, appconfig.lang, [])
}, (err, si) => {
if (err) {
winston.error('Failed to initialize search index.', err)
reject(err)
} else {
self._si = Promise.promisifyAll(si)
self._si.flushAsync().then(() => {
winston.info('Search index flushed and ready.')
resolve(true)
})
}
})
})
return self
},
/**
* Add a document to the index
*
* @param {Object} content Document content
* @return {Promise} Promise of the add operation
*/
add (content) {
let self = this
if (!content.isEntry) {
return Promise.resolve(true)
}
return self._isReady.then(() => {
return self.delete(content._id).then(() => {
return self._si.concurrentAddAsync({
fieldOptions: [{
fieldName: 'entryPath',
searchable: true,
weight: 2
},
{
fieldName: 'title',
nGramLength: [1, 2],
searchable: true,
weight: 3
},
{
fieldName: 'subtitle',
searchable: true,
weight: 1,
storeable: false
},
{
fieldName: 'parent',
searchable: false
},
{
fieldName: 'content',
searchable: true,
weight: 0,
storeable: false
}]
}, [{
entryPath: content._id,
title: content.title,
subtitle: content.subtitle || '',
parent: content.parent || '',
content: content.text || ''
}]).then(() => {
winston.log('verbose', 'Entry ' + content._id + ' added/updated to search index.')
return true
}).catch((err) => {
winston.error(err)
})
}).catch((err) => {
winston.error(err)
})
})
},
/**
* Delete an entry from the index
*
* @param {String} The entry path
* @return {Promise} Promise of the operation
*/
delete (entryPath) {
let self = this
return self._isReady.then(() => {
return streamToPromise(self._si.search({
query: [{
AND: { 'entryPath': [entryPath] }
}]
})).then((results) => {
if (results && results.length > 0) {
let delIds = _.map(results, 'id')
return self._si.delAsync(delIds)
} else {
return true
}
}).catch((err) => {
if (err.type === 'NotFoundError') {
return true
} else {
winston.error(err)
}
})
})
},
/**
* Flush the index
*
* @returns {Promise} Promise of the flush operation
*/
flush () {
let self = this
return self._isReady.then(() => {
return self._si.flushAsync()
})
},
/**
* Search the index
*
* @param {Array<String>} terms
* @returns {Promise<Object>} Hits and suggestions
*/
find (terms) {
let self = this
terms = _.chain(terms)
.deburr()
.toLower()
.trim()
.replace(/[^a-z0-9 ]/g, ' ')
.value()
let arrTerms = _.chain(terms)
.split(' ')
.filter((f) => { return !_.isEmpty(f) })
.value()
return streamToPromise(self._si.search({
query: [{
AND: { '*': arrTerms }
}],
pageSize: 10
})).then((hits) => {
if (hits.length > 0) {
hits = _.map(_.sortBy(hits, ['score']), h => {
return h.document
})
}
if (hits.length < 5) {
return streamToPromise(self._si.match({
beginsWith: terms,
threshold: 3,
limit: 5,
type: 'simple'
})).then((matches) => {
return {
match: hits,
suggest: matches
}
})
} else {
return {
match: hits,
suggest: []
}
}
}).catch((err) => {
if (err.type === 'NotFoundError') {
return {
match: [],
suggest: []
}
} else {
winston.error(err)
}
})
}
}