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| /**
* @file
*
* @author Nahid Akbar
* @year 2016
* @copyright Data61 -
* Commonwealth Scientific and Industrial Research Organisation (CSIRO) -
* Australian Government. All rights reserved.
*/
"use strict";
const Search = require('./Search');
const elasticsearch = require('elasticsearch');
/**
* Search using ElasticSearch.
* Needs to be revised at 10000 records.
* Needs ```elasticsearch``` package.
*/
class ElasticSearch extends Search
{
/**
* @override
*/
async connect()
{
/**
* reference to driver object
*/
this.client = new elasticsearch.Client({
host: this.connectionString,
maxRetries: 90 * 1024,
maxSockets: 1,
requestTimeout: 1024 * 1024,
sniffOnConnectionFault: true
});
try
{
await this.client.indices.delete({
index: this.collectionName,
});
}
catch (e)
{
// might fail if this is the first time
}
}
/**
* @override
*/
initialise(searchMeta, records)
{
/** store for later use */
this.searchMeta = searchMeta;
return new Promise((resolve, reject) =>
{
this.client.indices.create({
index: this.collectionName,
})
.then(() =>
{
let that = this;
function upload()
{
resolve(Promise.all(records.map(record => that.createRecord(record))));
}
function sort()
{
let properties = {};
let fields = searchMeta.fields || {};
Object.keys(fields)
.filter(f => !fields[f].dummy)
.forEach(field => properties[field] = {
type: "keyword"
});
let weights = Object.keys(searchMeta.searchWeights || {});
weights.forEach(field =>
{
properties[field] = properties[field] || {
type: "text",
fielddata: true
};
properties[field].type = "text";
properties[field].fielddata = true;
properties[field].analyzer = "fulltext_analyzer";
});
let sorts = searchMeta.sort || [];
sorts.forEach(field =>
{
properties[field] = properties[field] || {
type: "text",
};
properties[field].fields = {
case_insensitive: {
"type": "string",
"analyzer": "case_insensitive",
fielddata: true
}
}
if (properties[field].type === 'text')
{
properties[field].fielddata = true;
}
});
return that.client.indices.putMapping({
index: that.collectionName,
type: that.collectionName,
body: {
properties
},
});
}
function analyse()
{
return new Promise((resolve, reject) =>
{
that.client.indices.close({
index: that.collectionName
})
.then(() =>
{
that.client.indices.putSettings({
index: that.collectionName,
body: {
"settings": {
"analysis": {
"analyzer": {
"fulltext_analyzer": {
"tokenizer": "standard",
"filter": ["standard", "lowercase", "asciifolding", "porter_stem"]
},
"case_insensitive": {
"tokenizer": "keyword",
"filter": ["lowercase", "asciifolding"]
}
}
}
}
}
})
.then(() =>
{
that.client.indices.open({
index: that.collectionName
})
.then(resolve, reject);
}, reject);
}, reject);
});
}
analyse()
.then(() => sort()
.then(upload, reject), reject);
}, reject);
});
}
/**
* @override
*/
createRecord(record)
{
return this.updateRecord(record);
}
/**
* @override
* TODO: I think there is a bug with exisint record
*/
async updateRecord(record)
{
record = Object.assign({}, record);
const id = record[this.primaryKey];
delete record[this.primaryKey];
for (let x in record)
{
if (x.match(/(^_|password|roles|meta)/g))
{
delete record[x];
}
}
try
{
return await this.client.create({
index: this.collectionName,
type: this.collectionName,
id: id,
body: record,
refresh: true
});
}
catch (e)
{
return await this.client.update({
index: this.collectionName,
type: this.collectionName,
id: id,
body: {
doc: record
},
refresh: true
});
}
}
/**
* @override
*/
deleteRecord(record)
{
return this.client.delete({
index: this.collectionName,
type: this.collectionName,
id: record[this.primaryKey],
refresh: true
});
}
/**
* @override
*/
searchRecords(inquery)
{
const searchMeta = this.searchMeta;
return new Promise((resolve, reject) =>
{
let query = [
];
if (inquery.filter.length === 0)
{
query.push({
match_all: {}
});
}
else
{
inquery.filter.forEach(infilter =>
{
if (infilter.filter === 'equals')
{
let term = {};
term[infilter.field] = infilter.value[0];
query.push({
term
})
}
else if (infilter.filter === 'within')
{
let terms = {};
terms[infilter.field] = infilter.value;
query.push({
terms
})
}
else if (infilter.filter === 'regex')
{
let regexp = {};
regexp[infilter.field] = infilter.value[0];
if (regexp[infilter.field].match(/^\^/))
{
regexp[infilter.field] = regexp[infilter.field].substr(1)
}
if (regexp[infilter.field].match(/\$$/))
{
regexp[infilter.field] = regexp[infilter.field].substr(0, regexp[infilter.field].length - 1)
}
query.push({
regexp
})
}
else if (infilter.filter === 'search')
{
let query_string = {};
query_string.query = infilter.value[0];
Eif (searchMeta.searchWeights)
{
query_string.fields = Object.keys(searchMeta.searchWeights)
.map(key => `${key}^${searchMeta.searchWeights[key]}`);
}
query_string.analyzer = "fulltext_analyzer";
query.push({
query_string
})
}
else
{
console.error('Unhandelled Filter', infilter);
}
});
}
if (query.length === 1)
{
query = query[0];
}
else
{
query = {
bool: {
must: query
}
};
}
let body = {
query
};
body.sort = {};
if (!inquery.sort || inquery.sort === "search")
{
inquery.sort = '_score';
}
else
{
inquery.sort += '.case_insensitive'
}
body.sort[inquery.sort] = inquery.order === 'dsc' ? 'desc' : 'asc';
this.client.search({
index: this.collectionName,
body,
size: 10000,
_source: false
})
.then(results =>
{
results = results.hits.hits.map(h => h._id);
resolve(results);
}, reject);
});
}
}
module.exports = ElasticSearch;
|