100 lines
3.0 KiB
Go
100 lines
3.0 KiB
Go
package esquery
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import (
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"bytes"
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"encoding/json"
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"github.com/elastic/go-elasticsearch/v7"
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"github.com/elastic/go-elasticsearch/v7/esapi"
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)
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// AggregationRequest represents a complete request of type "aggregations"
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// (a.k.a "aggs") to ElasticSearch's search API. It simply wraps a map of named
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// aggregations, which are values of a type that implements the Mappable
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// interface.
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type AggregationRequest struct {
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Aggs map[string]Mappable
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}
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// Aggregation is an interface that each aggregation type must implement. It
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// is simply an extension of the Mappable interface to include a Named function,
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// which returns the name of the aggregation.
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type Aggregation interface {
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Mappable
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Name() string
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}
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// Aggregate generates a search request of type "aggs", represented by a
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// *AggregationRequest object. It receives a variadic amount of values that
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// implement the Aggregation interface, whether provided internally by the
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// library or custom aggregations provided by consuming code.
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func Aggregate(aggs ...Aggregation) *AggregationRequest {
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req := &AggregationRequest{
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Aggs: make(map[string]Mappable),
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}
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for _, agg := range aggs {
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req.Aggs[agg.Name()] = agg
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}
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return req
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}
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// Map implements the Mappable interface. It converts the "aggs" request into a
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// (potentially nested) map[string]interface{}.
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func (req *AggregationRequest) Map() map[string]interface{} {
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m := make(map[string]interface{})
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for name, agg := range req.Aggs {
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m[name] = agg.Map()
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}
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return map[string]interface{}{
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"aggs": m,
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}
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}
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// MarshalJSON implements the json.Marshaler interface, it simply encodes the
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// map representation of the request (provided by the Map method) as JSON.
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func (req *AggregationRequest) MarshalJSON() ([]byte, error) {
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return json.Marshal(req.Map())
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}
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// Run executes the request using the provided ElasticSearch client. Zero or
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// more search options can be provided as well. It returns the standard Response
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// type of the official Go client.
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func (req *AggregationRequest) Run(
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api *elasticsearch.Client,
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o ...func(*esapi.SearchRequest),
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) (res *esapi.Response, err error) {
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var b bytes.Buffer
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err = json.NewEncoder(&b).Encode(req.Map())
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if err != nil {
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return nil, err
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}
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opts := append([]func(*esapi.SearchRequest){api.Search.WithBody(&b)}, o...)
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return api.Search(opts...)
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}
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// RunSearch is the same as the Run method, except that it accepts a value of
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// type esapi.Search (usually this is the Search field of an elasticsearch.Client
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// object). Since the ElasticSearch client does not provide an interface type
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// for its API (which would allow implementation of mock clients), this provides
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// a workaround. The Search function in the ES client is actually a field of a
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// function type.
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func (req *AggregationRequest) RunSearch(
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search esapi.Search,
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o ...func(*esapi.SearchRequest),
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) (res *esapi.Response, err error) {
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var b bytes.Buffer
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err = json.NewEncoder(&b).Encode(req.Map())
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if err != nil {
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return nil, err
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}
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opts := append([]func(*esapi.SearchRequest){search.WithBody(&b)}, o...)
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return search(opts...)
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}
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