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elasticsearch-aggregator.go
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elasticsearch-aggregator.go
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package backends
// this file satifies the Aggregator interface for ElasticsearchIndexer
import (
"encoding/json"
"fmt"
"github.com/PerformLine/pivot/v3/dal"
"github.com/PerformLine/pivot/v3/filter"
"github.com/PerformLine/pivot/v3/filter/generators"
)
type esAggregationQuery struct {
Aggregations map[string]esAggregation `json:"aggs"`
Filter map[string]interface{} `json:"filter,omitempty"`
Size int `json:"size"`
}
type esAggregation map[string]interface{}
func (self *ElasticsearchIndexer) Sum(collection *dal.Collection, field string, f ...*filter.Filter) (float64, error) {
return self.aggregateFloat(collection, filter.Sum, field, f)
}
func (self *ElasticsearchIndexer) Count(collection *dal.Collection, flt ...*filter.Filter) (uint64, error) {
var f *filter.Filter
if len(flt) > 0 {
f = flt[0]
}
f.Limit = 1
var count uint64
var wasSet bool
if _, err := self.Query(collection, f, func(_ *dal.Record, err error, page IndexPage) error {
if err == nil {
if !wasSet {
count = uint64(page.TotalResults)
wasSet = true
}
return nil
} else {
return err
}
}); err == nil {
return count, nil
} else {
return 0, err
}
}
func (self *ElasticsearchIndexer) Minimum(collection *dal.Collection, field string, f ...*filter.Filter) (float64, error) {
return self.aggregateFloat(collection, filter.Minimum, field, f)
}
func (self *ElasticsearchIndexer) Maximum(collection *dal.Collection, field string, f ...*filter.Filter) (float64, error) {
return self.aggregateFloat(collection, filter.Maximum, field, f)
}
func (self *ElasticsearchIndexer) Average(collection *dal.Collection, field string, f ...*filter.Filter) (float64, error) {
return self.aggregateFloat(collection, filter.Average, field, f)
}
func (self *ElasticsearchIndexer) GroupBy(collection *dal.Collection, groupBy []string, aggregates []filter.Aggregate, flt ...*filter.Filter) (*dal.RecordSet, error) {
if result, err := self.aggregate(collection, groupBy, aggregates, flt, false); err == nil {
return result.(*dal.RecordSet), nil
} else {
return nil, err
}
}
func (self *ElasticsearchIndexer) aggregateFloat(collection *dal.Collection, aggregation filter.Aggregation, field string, flt []*filter.Filter) (float64, error) {
if result, err := self.aggregate(collection, nil, []filter.Aggregate{
{
Aggregation: aggregation,
Field: field,
},
}, flt, true); err == nil {
return result.(float64), nil
} else {
return 0, err
}
}
func (self *ElasticsearchIndexer) aggregate(collection *dal.Collection, groupBy []string, aggregates []filter.Aggregate, flt []*filter.Filter, single bool) (interface{}, error) {
var f *filter.Filter
if len(flt) > 0 {
f = flt[0]
}
if query, err := filter.Render(
generators.NewElasticsearchGenerator(),
collection.GetAggregatorName(),
f,
); err == nil {
var esFilter map[string]interface{}
if err := json.Unmarshal(query, &esFilter); err == nil {
aggs := esAggregationQuery{
Aggregations: make(map[string]esAggregation),
}
for _, aggregate := range aggregates {
var statsKey = aggregate.Field
var statsField esAggregation
if s, ok := aggs.Aggregations[statsKey]; ok {
statsField = s
} else {
statsField = make(esAggregation)
}
statsField[`stats`] = map[string]interface{}{
`field`: aggregate.Field,
}
aggs.Aggregations[statsKey] = statsField
}
if len(esFilter) > 0 {
aggs.Filter = esFilter
aggs.Size = 0
}
if query, err := json.Marshal(aggs); err == nil {
if req, err := self.newRequest(`GET`, fmt.Sprintf("/%s/_search", collection.GetAggregatorName()), string(query)); err == nil {
// perform request, read response
if response, err := self.client.Do(req); err == nil {
if response.StatusCode < 400 {
output := make(map[string]interface{})
if err := json.NewDecoder(response.Body).Decode(&output); err == nil {
return output, nil
} else {
return nil, fmt.Errorf("response decode error: %v", err)
}
} else {
return nil, fmt.Errorf("Got HTTP %v", response.Status)
}
} else {
return nil, err
}
} else {
return nil, err
}
} else {
return nil, fmt.Errorf("filter encode error: %v", err)
}
} else {
return nil, fmt.Errorf("filter decode error: %v", err)
}
} else {
return nil, fmt.Errorf("filter error: %v", err)
}
}
func (self *ElasticsearchIndexer) AggregatorConnectionString() *dal.ConnectionString {
return self.conn
}
func (self *ElasticsearchIndexer) AggregatorInitialize(parent Backend) error {
return nil
}