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count.go
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count.go
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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/http"
"net/url"
"strings"
"github.com/olivere/elastic/v7/uritemplates"
)
// CountService is a convenient service for determining the
// number of documents in an index. Use SearchService with
// a SearchType of count for counting with queries etc.
type CountService struct {
client *Client
pretty *bool // pretty format the returned JSON response
human *bool // return human readable values for statistics
errorTrace *bool // include the stack trace of returned errors
filterPath []string // list of filters used to reduce the response
headers http.Header // custom request-level HTTP headers
index []string
typ []string
allowNoIndices *bool
analyzeWildcard *bool
analyzer string
defaultOperator string
df string
expandWildcards string
ignoreUnavailable *bool
ignoreThrottled *bool
lenient *bool
lowercaseExpandedTerms *bool
minScore interface{}
preference string
q string
query Query
routing string
terminateAfter *int
bodyJson interface{}
bodyString string
}
// NewCountService creates a new CountService.
func NewCountService(client *Client) *CountService {
return &CountService{
client: client,
}
}
// Pretty tells Elasticsearch whether to return a formatted JSON response.
func (s *CountService) Pretty(pretty bool) *CountService {
s.pretty = &pretty
return s
}
// Human specifies whether human readable values should be returned in
// the JSON response, e.g. "7.5mb".
func (s *CountService) Human(human bool) *CountService {
s.human = &human
return s
}
// ErrorTrace specifies whether to include the stack trace of returned errors.
func (s *CountService) ErrorTrace(errorTrace bool) *CountService {
s.errorTrace = &errorTrace
return s
}
// FilterPath specifies a list of filters used to reduce the response.
func (s *CountService) FilterPath(filterPath ...string) *CountService {
s.filterPath = filterPath
return s
}
// Header adds a header to the request.
func (s *CountService) Header(name string, value string) *CountService {
if s.headers == nil {
s.headers = http.Header{}
}
s.headers.Add(name, value)
return s
}
// Headers specifies the headers of the request.
func (s *CountService) Headers(headers http.Header) *CountService {
s.headers = headers
return s
}
// Index sets the names of the indices to restrict the results.
func (s *CountService) Index(index ...string) *CountService {
if s.index == nil {
s.index = make([]string, 0)
}
s.index = append(s.index, index...)
return s
}
// Type sets the types to use to restrict the results.
//
// Deprecated: Types are in the process of being removed. Instead of using a type, prefer to
// filter on a field on the document.
func (s *CountService) Type(typ ...string) *CountService {
if s.typ == nil {
s.typ = make([]string, 0)
}
s.typ = append(s.typ, typ...)
return s
}
// AllowNoIndices indicates whether to ignore if a wildcard indices
// expression resolves into no concrete indices. (This includes "_all" string
// or when no indices have been specified).
func (s *CountService) AllowNoIndices(allowNoIndices bool) *CountService {
s.allowNoIndices = &allowNoIndices
return s
}
// AnalyzeWildcard specifies whether wildcard and prefix queries should be
// analyzed (default: false).
func (s *CountService) AnalyzeWildcard(analyzeWildcard bool) *CountService {
s.analyzeWildcard = &analyzeWildcard
return s
}
// Analyzer specifies the analyzer to use for the query string.
func (s *CountService) Analyzer(analyzer string) *CountService {
s.analyzer = analyzer
return s
}
// DefaultOperator specifies the default operator for query string query (AND or OR).
func (s *CountService) DefaultOperator(defaultOperator string) *CountService {
s.defaultOperator = defaultOperator
return s
}
// Df specifies the field to use as default where no field prefix is given
// in the query string.
func (s *CountService) Df(df string) *CountService {
s.df = df
return s
}
// ExpandWildcards indicates whether to expand wildcard expression to
// concrete indices that are open, closed or both.
func (s *CountService) ExpandWildcards(expandWildcards string) *CountService {
s.expandWildcards = expandWildcards
return s
}
// IgnoreUnavailable indicates whether specified concrete indices should be
// ignored when unavailable (missing or closed).
func (s *CountService) IgnoreUnavailable(ignoreUnavailable bool) *CountService {
s.ignoreUnavailable = &ignoreUnavailable
return s
}
// IgnoreThrottled indicates whether specified concrete, expanded or aliased
// indices should be ignored when throttled.
func (s *CountService) IgnoreThrottled(ignoreThrottled bool) *CountService {
s.ignoreThrottled = &ignoreThrottled
return s
}
// Lenient specifies whether format-based query failures (such as
// providing text to a numeric field) should be ignored.
func (s *CountService) Lenient(lenient bool) *CountService {
s.lenient = &lenient
return s
}
// LowercaseExpandedTerms specifies whether query terms should be lowercased.
func (s *CountService) LowercaseExpandedTerms(lowercaseExpandedTerms bool) *CountService {
s.lowercaseExpandedTerms = &lowercaseExpandedTerms
return s
}
// MinScore indicates to include only documents with a specific `_score`
// value in the result.
func (s *CountService) MinScore(minScore interface{}) *CountService {
s.minScore = minScore
return s
}
// Preference specifies the node or shard the operation should be
// performed on (default: random).
func (s *CountService) Preference(preference string) *CountService {
s.preference = preference
return s
}
// Q in the Lucene query string syntax. You can also use Query to pass
// a Query struct.
func (s *CountService) Q(q string) *CountService {
s.q = q
return s
}
// Query specifies the query to pass. You can also pass a query string with Q.
func (s *CountService) Query(query Query) *CountService {
s.query = query
return s
}
// Routing specifies the routing value.
func (s *CountService) Routing(routing string) *CountService {
s.routing = routing
return s
}
// TerminateAfter indicates the maximum count for each shard, upon reaching
// which the query execution will terminate early.
func (s *CountService) TerminateAfter(terminateAfter int) *CountService {
s.terminateAfter = &terminateAfter
return s
}
// BodyJson specifies the query to restrict the results specified with the
// Query DSL (optional). The interface{} will be serialized to a JSON document,
// so use a map[string]interface{}.
func (s *CountService) BodyJson(body interface{}) *CountService {
s.bodyJson = body
return s
}
// Body specifies a query to restrict the results specified with
// the Query DSL (optional).
func (s *CountService) BodyString(body string) *CountService {
s.bodyString = body
return s
}
// buildURL builds the URL for the operation.
func (s *CountService) buildURL() (string, url.Values, error) {
var err error
var path string
if len(s.index) > 0 && len(s.typ) > 0 {
path, err = uritemplates.Expand("/{index}/{type}/_count", map[string]string{
"index": strings.Join(s.index, ","),
"type": strings.Join(s.typ, ","),
})
} else if len(s.index) > 0 {
path, err = uritemplates.Expand("/{index}/_count", map[string]string{
"index": strings.Join(s.index, ","),
})
} else if len(s.typ) > 0 {
path, err = uritemplates.Expand("/_all/{type}/_count", map[string]string{
"type": strings.Join(s.typ, ","),
})
} else {
path = "/_all/_count"
}
if err != nil {
return "", url.Values{}, err
}
// Add query string parameters
params := url.Values{}
if v := s.pretty; v != nil {
params.Set("pretty", fmt.Sprint(*v))
}
if v := s.human; v != nil {
params.Set("human", fmt.Sprint(*v))
}
if v := s.errorTrace; v != nil {
params.Set("error_trace", fmt.Sprint(*v))
}
if len(s.filterPath) > 0 {
params.Set("filter_path", strings.Join(s.filterPath, ","))
}
if s.allowNoIndices != nil {
params.Set("allow_no_indices", fmt.Sprintf("%v", *s.allowNoIndices))
}
if s.analyzeWildcard != nil {
params.Set("analyze_wildcard", fmt.Sprintf("%v", *s.analyzeWildcard))
}
if s.analyzer != "" {
params.Set("analyzer", s.analyzer)
}
if s.defaultOperator != "" {
params.Set("default_operator", s.defaultOperator)
}
if s.df != "" {
params.Set("df", s.df)
}
if s.expandWildcards != "" {
params.Set("expand_wildcards", s.expandWildcards)
}
if s.ignoreUnavailable != nil {
params.Set("ignore_unavailable", fmt.Sprintf("%v", *s.ignoreUnavailable))
}
if s.ignoreThrottled != nil {
params.Set("ignore_throttled", fmt.Sprintf("%v", *s.ignoreThrottled))
}
if s.lenient != nil {
params.Set("lenient", fmt.Sprintf("%v", *s.lenient))
}
if s.lowercaseExpandedTerms != nil {
params.Set("lowercase_expanded_terms", fmt.Sprintf("%v", *s.lowercaseExpandedTerms))
}
if s.minScore != nil {
params.Set("min_score", fmt.Sprintf("%v", s.minScore))
}
if s.preference != "" {
params.Set("preference", s.preference)
}
if s.q != "" {
params.Set("q", s.q)
}
if s.routing != "" {
params.Set("routing", s.routing)
}
if s.terminateAfter != nil {
params.Set("terminate_after", fmt.Sprintf("%v", *s.terminateAfter))
}
return path, params, nil
}
// Validate checks if the operation is valid.
func (s *CountService) Validate() error {
return nil
}
// Do executes the operation.
func (s *CountService) Do(ctx context.Context) (int64, error) {
// Check pre-conditions
if err := s.Validate(); err != nil {
return 0, err
}
// Get URL for request
path, params, err := s.buildURL()
if err != nil {
return 0, err
}
// Setup HTTP request body
var body interface{}
if s.query != nil {
src, err := s.query.Source()
if err != nil {
return 0, err
}
query := make(map[string]interface{})
query["query"] = src
body = query
} else if s.bodyJson != nil {
body = s.bodyJson
} else if s.bodyString != "" {
body = s.bodyString
}
// Get HTTP response
res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
Method: "POST",
Path: path,
Params: params,
Body: body,
Headers: s.headers,
})
if err != nil {
return 0, err
}
// Return result
ret := new(CountResponse)
if err := s.client.decoder.Decode(res.Body, ret); err != nil {
return 0, err
}
if ret != nil {
return ret.Count, nil
}
return int64(0), nil
}
// CountResponse is the response of using the Count API.
type CountResponse struct {
Count int64 `json:"count"`
TerminatedEarly bool `json:"terminated_early,omitempty"`
Shards *ShardsInfo `json:"_shards,omitempty"`
}