-
Notifications
You must be signed in to change notification settings - Fork 13
/
search.js
228 lines (204 loc) · 7 KB
/
search.js
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
'use strict';
const pTry = require('p-try');
const pick = require('lodash/pick');
const parseQuery = require('./util/parseSearchQuery');
const toEsClient = require('./util/toEsClient');
function buildMatchQueries(params) {
if (!params.text) {
return [];
}
return [
// Standard match using cross_fields
{
multi_match: {
query: params.text,
operator: 'and',
fields: [
'package.name.standard^4',
'package.description.standard',
'package.keywords.standard^2',
],
type: 'cross_fields',
boost: 6,
tie_breaker: 0.5,
},
},
// Partial match using edge-ngram
{
multi_match: {
query: params.text,
operator: 'and',
fields: [
'package.name.edge_ngram^4',
'package.description.edge_ngram',
'package.keywords.edge_ngram^2',
],
type: 'phrase',
slop: 3,
boost: 3,
tie_breaker: 0.5,
},
},
// Normal term match with an english stemmer
{
multi_match: {
query: params.text,
operator: 'and',
fields: [
'package.name.english_docs^4',
'package.description.english_docs',
'package.keywords.english_docs^2',
],
type: 'cross_fields',
boost: 3,
tie_breaker: 0.5,
},
},
// Normal term match with a more aggressive english stemmer (not so important)
{
multi_match: {
query: params.text,
operator: 'and',
fields: [
'package.name.english_aggressive_docs^4',
'package.description.english_aggressive_docs',
'package.keywords.english_aggressive_docs^2',
],
type: 'cross_fields',
tie_breaker: 0.5,
},
},
];
}
function buildFilterQuery(params) {
const filters = {
must: [],
mustNot: [],
};
if (params.author) {
filters.must.push({
bool: {
should: [
{ term: { 'package.author.name': params.author } },
{ term: { 'package.author.username': params.author } },
{ term: { 'package.author.email': params.author } },
],
},
});
}
if (params.maintainer) {
filters.must.push({
bool: {
should: [
{ term: { 'package.maintainers.username': params.maintainer } },
{ term: { 'package.maintainers.email': params.maintainer } },
],
},
});
}
if (params.scope) {
filters.must.push({
term: { 'package.scope': params.scope },
});
}
if (params.keywords.include.length) {
filters.must.push({
terms: { 'package.keywords.raw': params.keywords.include }, // Operator is OR
});
}
if (params.keywords.exclude.length) {
filters.mustNot.push({
terms: { 'package.keywords.raw': params.keywords.exclude },
});
}
if (params.is.length) {
filters.must.push({
bool: {
must: params.is.map((is) => ({
exists: { field: `flags.${is}` },
})),
},
});
}
if (params.not.length) {
filters.mustNot.push({
bool: {
must: params.not.map((not) => ({
exists: { field: `flags.${not}` },
})),
},
});
}
return filters;
}
function buildScriptScore(params) {
let source = '(doc["score.detail.popularity"].value * params.popularityWeight + ' +
'doc["score.detail.quality"].value * params.qualityWeight + ' +
'doc["score.detail.maintenance"].value * params.maintenanceWeight)';
source = params.boostExact ?
`doc["package.name.raw"].value.equals(params.text) ? 100000 + ${source} : _score * Math.pow(${source}, params.scoreEffect)` :
`_score * Math.pow(${source}, params.scoreEffect)`;
return {
script: {
source,
params: {
text: params.text || '',
scoreEffect: params.scoreEffect,
qualityWeight: params.qualityWeight,
popularityWeight: params.popularityWeight,
maintenanceWeight: params.maintenanceWeight,
},
},
};
}
// ------------------------------------------------------------
function search(q, esClient, options) {
esClient = toEsClient(esClient);
options = Object.assign({ from: 0, size: 25, throwOnInvalid: false }, options);
return pTry(() => parseQuery(q, options))
.then((params) => {
if (!params) {
return { total: 0, results: [] };
}
const matchQueries = buildMatchQueries(params);
const filterQuery = buildFilterQuery(params);
const scriptScore = buildScriptScore(params);
// Need to use Promise.resolve because Elasticsearch does not use native Promise
/* eslint camelcase: 0 */
return Promise.resolve(esClient.search({
index: 'npms-current',
type: 'score',
body: {
size: options.size,
from: options.from,
query: {
function_score: {
boost_mode: 'replace',
query: {
bool: {
must: filterQuery.must,
must_not: filterQuery.mustNot,
should: matchQueries,
minimum_should_match: matchQueries.length ? 1 : 0,
},
},
script_score: scriptScore,
},
},
},
}))
.then((res) => ({
total: res.hits.total,
results: res.hits.hits.map((hit) => {
// We can't use _fields in the query because the JSON properties order get messed up,
// see https://github.com/elastic/elasticsearch/issues/17639
// So we filter the source fields manually with pick().. this is not ideal since there's payload
// navigating through the network that we do not use, but it's definitively better than having order messed up
const result = pick(hit._source, 'package', 'flags', 'score');
result.searchScore = hit._score;
return result;
}),
}));
});
}
module.exports = search;