/
elasticsearch.go
289 lines (273 loc) · 9.62 KB
/
elasticsearch.go
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package document
import (
"context"
"fmt"
"github.com/jivesearch/jivesearch/log"
"github.com/olivere/elastic"
"golang.org/x/text/language"
)
// ElasticSearch hold connection and index settings
type ElasticSearch struct {
Client *elastic.Client
Index string
Type string
}
var langAnalyzer = make(map[language.Tag]string)
// IndexName returns the language-specific index
// e.g. "search-english", "search-french"
func (e *ElasticSearch) IndexName(a string) string {
return e.Index + "-" + a
}
// Analyzer returns the appropriate analyzer for a given language.
func (e *ElasticSearch) Analyzer(lang language.Tag) (string, error) {
var analyzer string
var ok bool
// Get the parent tag until an analyzer is found
tag, _, _ := Matcher.Match(lang)
for ; tag != language.Und; tag = tag.Parent() {
if analyzer, ok = langAnalyzer[tag]; ok {
return analyzer, nil
}
}
return "", fmt.Errorf("analyzer should not be blank. Lang: %s", lang)
}
// Setup will create our main search index
// and language-specific indices for the content
func (e *ElasticSearch) Setup() error {
// We create one index per analyzer: search-english, search-spanish, etc...
// This is a list of all elasticsearch analyzers
analyzers := []string{"arabic", "armenian", "basque", "brazilian",
"bulgarian", "catalan", "cjk", "czech", "danish", "dutch",
"english", "finnish", "french", "galician", "german", "greek",
"hindi", "hungarian", "indonesian", "irish", "italian", "latvian",
"lithuanian", "norwegian", "persian", "portuguese", "romanian",
"russian", "sorani", "spanish", "swedish", "turkish", "thai",
}
for _, a := range analyzers {
idx := e.IndexName(a)
exists, err := e.Client.IndexExists(idx).Do(context.TODO())
if err != nil {
return err
}
if !exists {
log.Info.Println("Creating index:", idx)
if _, err = e.Client.CreateIndex(idx).Body(e.mapping(a)).Do(context.TODO()); err != nil {
return err
}
}
}
return nil
}
// mapping is the mapping of our main search Index.
// https://www.elastic.co/guide/en/elasticsearch/guide/current/one-lang-docs.html
func (e *ElasticSearch) mapping(a string) string {
// Notes: Does the domain_name_analyzer and path_analyzer deal with rtl text (arabic, hebrew, etc)???
// Also, needs better analyzer for domain...
// e.g. search for "jimi hendrix" should return jimihendrix.com
m := fmt.Sprintf(`{
"settings": {
"analysis": {
"filter": {
"my_shingle_filter": {
"type": "shingle",
"min_shingle_size": 2,
"max_shingle_size": 2,
"output_unigrams": false
}
},
"analyzer": {
"my_shingle_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"my_shingle_filter"
]
},
"domain_name_analyzer": {
"tokenizer": "domain_name_tokenizer"
},
"path_analyzer": {
"tokenizer": "path_tokenizer"
}
},
"tokenizer": {
"domain_name_tokenizer": {
"type": "path_hierarchy",
"delimiter": "."
},
"path_tokenizer": {
"type": "path_hierarchy",
"delimiter": "/",
"replacement": " "
}
}
}
},
"mappings": {
"document": {
"_all": {
"enabled": false
},
"dynamic": "strict",
"properties": {
"title": {
"type": "text",
"fields": {
"lang": {
"type": "text",
"analyzer": "%v"
},
"shingles": {
"type": "text",
"analyzer": "my_shingle_analyzer"
}
}
},
"description": {
"type": "text",
"fields": {
"lang": {
"type": "text",
"analyzer": "%v"
},
"shingles": {
"type": "text",
"analyzer": "my_shingle_analyzer"
}
}
},
"id": {
"type": "keyword"
},
"keywords": {
"type": "text"
},
"scheme": {
"type": "keyword"
},
"domain": {
"type": "text",
"analyzer": "domain_name_analyzer"
},
"tld": {
"type": "keyword"
},
"host": {
"type": "keyword"
},
"path_parts": {
"type": "text",
"analyzer": "path_analyzer"
},
"index": {
"type": "boolean"
},
"crawled": {
"type": "date",
"format": "basic_date"
},
"date": {
"type": "date",
"format": "strict_date_optional_time"
},
"status": {
"type": "short"
},
"canonical": {
"type": "text",
"index": "false"
},
"mime": {
"type": "keyword"
}
}
}
}
}`, a, a)
return m
}
func init() {
// These are the most commonly used languages mapped to an elasticsearch analyzer
// TODO: fill in the rest of this map. Also, we haven't mapped the Basque, Galician,
// Irish, and Sorani analyzers to any languages yet.
//langAnalyzer[language.Afrikaans] = "" // af
//langAnalyzer[language.Amharic] = "" // am
langAnalyzer[language.Arabic] = "arabic" // ar
//langAnalyzer[language.ModernStandardArabic] = "" // ar-001
//langAnalyzer[language.Azerbaijani] = "" // az
langAnalyzer[language.Bulgarian] = "bulgarian" // bg
//langAnalyzer[language.Bengali] = "" // bn
langAnalyzer[language.Catalan] = "catalan" // ca
langAnalyzer[language.Czech] = "czech" // cs
langAnalyzer[language.Danish] = "danish" // da
langAnalyzer[language.German] = "german" // de
langAnalyzer[language.Greek] = "greek" // el
langAnalyzer[language.English] = "english" // en
langAnalyzer[language.AmericanEnglish] = "english" // en-US
langAnalyzer[language.BritishEnglish] = "english" // en-GB
langAnalyzer[language.Spanish] = "spanish" // es
langAnalyzer[language.EuropeanSpanish] = "spanish" // es-ES
langAnalyzer[language.LatinAmericanSpanish] = "spanish" // es-419
//langAnalyzer[language.Estonian] = "" // et
langAnalyzer[language.Persian] = "persian" // fa
langAnalyzer[language.Finnish] = "finnish" // fi
//langAnalyzer[language.Filipino] = "" // fil
langAnalyzer[language.French] = "french" // fr
langAnalyzer[language.CanadianFrench] = "french" // fr-CA
//langAnalyzer[language.Gujarati] = "" // gu
//langAnalyzer[language.Hebrew] = "" // he
langAnalyzer[language.Hindi] = "hindi" // hi
//langAnalyzer[language.Croatian] = "" // hr
langAnalyzer[language.Hungarian] = "hungarian" // hu
langAnalyzer[language.Armenian] = "armenian" // hy
langAnalyzer[language.Indonesian] = "indonesian" // id
//langAnalyzer[language.Icelandic] = "" // is
langAnalyzer[language.Italian] = "italian" // it
langAnalyzer[language.Japanese] = "cjk" // ja
//langAnalyzer[language.Georgian] = "" // ka
//langAnalyzer[language.Kazakh] = "" // kk
//langAnalyzer[language.Khmer] = "" // km
//langAnalyzer[language.Kannada] = "" // kn
langAnalyzer[language.Korean] = "cjk" // ko
//langAnalyzer[language.Kirghiz] = "" // ky
//langAnalyzer[language.Lao] = "" // lo
langAnalyzer[language.Lithuanian] = "lithuanian" // lt
langAnalyzer[language.Latvian] = "latvian" // lv
//langAnalyzer[language.Macedonian] = "" // mk
//langAnalyzer[language.Malayalam] = "" // ml
//langAnalyzer[language.Mongolian] = "" // mn
//langAnalyzer[language.Marathi] = "" // mr
//langAnalyzer[language.Malay] = "" // ms
//langAnalyzer[language.Burmese] = "" // my
//langAnalyzer[language.Nepali] = "" // ne
langAnalyzer[language.Dutch] = "dutch" // nl
langAnalyzer[language.Norwegian] = "norwegian" // no
//langAnalyzer[language.Punjabi] = "" // pa
//langAnalyzer[language.Polish] = "" // pl
langAnalyzer[language.Portuguese] = "portuguese" // pt
langAnalyzer[language.BrazilianPortuguese] = "brazilian" // pt-BR
langAnalyzer[language.EuropeanPortuguese] = "portuguese" // pt-PT
langAnalyzer[language.Romanian] = "romanian" // ro
langAnalyzer[language.Russian] = "russian" // ru
//langAnalyzer[language.Sinhala] = "" // si
//langAnalyzer[language.Slovak] = "" // sk
//langAnalyzer[language.Slovenian] = "" // sl
//langAnalyzer[language.Albanian] = "" // sq
//langAnalyzer[language.Serbian] = "" // sr
//langAnalyzer[language.SerbianLatin] = "" // sr-Latn
langAnalyzer[language.Swedish] = "swedish" // sv
//langAnalyzer[language.Swahili] = "" // sw
//langAnalyzer[language.Tamil] = "" // ta
//langAnalyzer[language.Telugu] = "" // te
langAnalyzer[language.Thai] = "thai" // th
langAnalyzer[language.Turkish] = "turkish" // tr
//langAnalyzer[language.Ukrainian] = "" // uk
//langAnalyzer[language.Urdu] = "" // ur
//langAnalyzer[language.Uzbek] = "" // uz
langAnalyzer[language.Vietnamese] = "cjk" // vi
langAnalyzer[language.Chinese] = "cjk" // zh
langAnalyzer[language.SimplifiedChinese] = "cjk" // zh-Hans
langAnalyzer[language.TraditionalChinese] = "cjk" // zh-Hant
//langAnalyzer[language.Zulu] = "" // zu
}