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// Copyright 2012-present Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
import (
"context"
"fmt"
"net/url"
"github.com/olivere/elastic/uritemplates"
)
// IndicesAnalyzeService performs the analysis process on a text and returns
// the tokens breakdown of the text.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/6.0/indices-analyze.html
// for detail.
type IndicesAnalyzeService struct {
client *Client
pretty bool
index string
request *IndicesAnalyzeRequest
format string
preferLocal *bool
bodyJson interface{}
bodyString string
}
// NewIndicesAnalyzeService creates a new IndicesAnalyzeService.
func NewIndicesAnalyzeService(client *Client) *IndicesAnalyzeService {
return &IndicesAnalyzeService{
client: client,
request: new(IndicesAnalyzeRequest),
}
}
// Index is the name of the index to scope the operation.
func (s *IndicesAnalyzeService) Index(index string) *IndicesAnalyzeService {
s.index = index
return s
}
// Format of the output.
func (s *IndicesAnalyzeService) Format(format string) *IndicesAnalyzeService {
s.format = format
return s
}
// PreferLocal, when true, specifies that a local shard should be used
// if available. When false, a random shard is used (default: true).
func (s *IndicesAnalyzeService) PreferLocal(preferLocal bool) *IndicesAnalyzeService {
s.preferLocal = &preferLocal
return s
}
// Request passes the analyze request to use.
func (s *IndicesAnalyzeService) Request(request *IndicesAnalyzeRequest) *IndicesAnalyzeService {
if request == nil {
s.request = new(IndicesAnalyzeRequest)
} else {
s.request = request
}
return s
}
// Analyzer is the name of the analyzer to use.
func (s *IndicesAnalyzeService) Analyzer(analyzer string) *IndicesAnalyzeService {
s.request.Analyzer = analyzer
return s
}
// Attributes is a list of token attributes to output; this parameter works
// only with explain=true.
func (s *IndicesAnalyzeService) Attributes(attributes ...string) *IndicesAnalyzeService {
s.request.Attributes = attributes
return s
}
// CharFilter is a list of character filters to use for the analysis.
func (s *IndicesAnalyzeService) CharFilter(charFilter ...string) *IndicesAnalyzeService {
s.request.CharFilter = charFilter
return s
}
// Explain, when true, outputs more advanced details (default: false).
func (s *IndicesAnalyzeService) Explain(explain bool) *IndicesAnalyzeService {
s.request.Explain = explain
return s
}
// Field specifies to use a specific analyzer configured for this field (instead of passing the analyzer name).
func (s *IndicesAnalyzeService) Field(field string) *IndicesAnalyzeService {
s.request.Field = field
return s
}
// Filter is a list of filters to use for the analysis.
func (s *IndicesAnalyzeService) Filter(filter ...string) *IndicesAnalyzeService {
s.request.Filter = filter
return s
}
// Text is the text on which the analysis should be performed (when request body is not used).
func (s *IndicesAnalyzeService) Text(text ...string) *IndicesAnalyzeService {
s.request.Text = text
return s
}
// Tokenizer is the name of the tokenizer to use for the analysis.
func (s *IndicesAnalyzeService) Tokenizer(tokenizer string) *IndicesAnalyzeService {
s.request.Tokenizer = tokenizer
return s
}
// Pretty indicates that the JSON response be indented and human readable.
func (s *IndicesAnalyzeService) Pretty(pretty bool) *IndicesAnalyzeService {
s.pretty = pretty
return s
}
// BodyJson is the text on which the analysis should be performed.
func (s *IndicesAnalyzeService) BodyJson(body interface{}) *IndicesAnalyzeService {
s.bodyJson = body
return s
}
// BodyString is the text on which the analysis should be performed.
func (s *IndicesAnalyzeService) BodyString(body string) *IndicesAnalyzeService {
s.bodyString = body
return s
}
// buildURL builds the URL for the operation.
func (s *IndicesAnalyzeService) buildURL() (string, url.Values, error) {
// Build URL
var err error
var path string
if s.index == "" {
path = "/_analyze"
} else {
path, err = uritemplates.Expand("/{index}/_analyze", map[string]string{
"index": s.index,
})
}
if err != nil {
return "", url.Values{}, err
}
// Add query string parameters
params := url.Values{}
if s.pretty {
params.Set("pretty", "true")
}
if s.format != "" {
params.Set("format", s.format)
}
if s.preferLocal != nil {
params.Set("prefer_local", fmt.Sprintf("%v", *s.preferLocal))
}
return path, params, nil
}
// Do will execute the request with the given context.
func (s *IndicesAnalyzeService) Do(ctx context.Context) (*IndicesAnalyzeResponse, error) {
// Check pre-conditions
if err := s.Validate(); err != nil {
return nil, err
}
path, params, err := s.buildURL()
if err != nil {
return nil, err
}
// Setup HTTP request body
var body interface{}
if s.bodyJson != nil {
body = s.bodyJson
} else if s.bodyString != "" {
body = s.bodyString
} else {
// Request parameters are deprecated in 5.1.1, and we must use a JSON
// structure in the body to pass the parameters.
// See https://www.elastic.co/guide/en/elasticsearch/reference/6.0/indices-analyze.html
body = s.request
}
res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
Method: "POST",
Path: path,
Params: params,
Body: body,
})
if err != nil {
return nil, err
}
ret := new(IndicesAnalyzeResponse)
if err = s.client.decoder.Decode(res.Body, ret); err != nil {
return nil, err
}
return ret, nil
}
func (s *IndicesAnalyzeService) Validate() error {
var invalid []string
if s.bodyJson == nil && s.bodyString == "" {
if len(s.request.Text) == 0 {
invalid = append(invalid, "Text")
}
}
if len(invalid) > 0 {
return fmt.Errorf("missing required fields: %v", invalid)
}
return nil
}
// IndicesAnalyzeRequest specifies the parameters of the analyze request.
type IndicesAnalyzeRequest struct {
Text []string `json:"text,omitempty"`
Analyzer string `json:"analyzer,omitempty"`
Tokenizer string `json:"tokenizer,omitempty"`
Filter []string `json:"filter,omitempty"`
CharFilter []string `json:"char_filter,omitempty"`
Field string `json:"field,omitempty"`
Explain bool `json:"explain,omitempty"`
Attributes []string `json:"attributes,omitempty"`
}
type IndicesAnalyzeResponse struct {
Tokens []IndicesAnalyzeResponseToken `json:"tokens"` // json part for normal message
Detail IndicesAnalyzeResponseDetail `json:"detail"` // json part for verbose message of explain request
}
type IndicesAnalyzeResponseToken struct {
Token string `json:"token"`
StartOffset int `json:"start_offset"`
EndOffset int `json:"end_offset"`
Type string `json:"type"`
Position int `json:"position"`
}
type IndicesAnalyzeResponseDetail struct {
CustomAnalyzer bool `json:"custom_analyzer"`
Charfilters []interface{} `json:"charfilters"`
Analyzer struct {
Name string `json:"name"`
Tokens []struct {
Token string `json:"token"`
StartOffset int `json:"start_offset"`
EndOffset int `json:"end_offset"`
Type string `json:"type"`
Position int `json:"position"`
Bytes string `json:"bytes"`
PositionLength int `json:"positionLength"`
} `json:"tokens"`
} `json:"analyzer"`
Tokenizer struct {
Name string `json:"name"`
Tokens []struct {
Token string `json:"token"`
StartOffset int `json:"start_offset"`
EndOffset int `json:"end_offset"`
Type string `json:"type"`
Position int `json:"position"`
} `json:"tokens"`
} `json:"tokenizer"`
Tokenfilters []struct {
Name string `json:"name"`
Tokens []struct {
Token string `json:"token"`
StartOffset int `json:"start_offset"`
EndOffset int `json:"end_offset"`
Type string `json:"type"`
Position int `json:"position"`
Keyword bool `json:"keyword"`
} `json:"tokens"`
} `json:"tokenfilters"`
}
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