a2a8d54bb6
This change adds `access` format support for notifications to a Elasticsearch server, and it refactors `namespace` format support. In the case of `access` format, for each event in Minio, a JSON document is inserted into Elasticsearch with its timestamp set to the event's timestamp, and with the ID generated automatically by elasticsearch. No events are modified or deleted in this mode. In the case of `namespace` format, for each event in Minio, a JSON document is keyed together by the bucket and object name is updated in Elasticsearch. In the case of an object being created or over-written in Minio, a new document or an existing document is inserted into the Elasticsearch index. If an object is deleted in Minio, the corresponding document is deleted from the Elasticsearch index. Additionally, this change upgrades Elasticsearch support to the 5.x series. This is a breaking change, and users of previous elasticsearch versions should upgrade. Also updates documentation on Elasticsearch notification target usage and has a link to an elasticsearch upgrade guide. This is the last patch that finally resolves #3928.
121 lines
3.1 KiB
Go
121 lines
3.1 KiB
Go
// Copyright 2012-present Oliver Eilhard. All rights reserved.
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// Use of this source code is governed by a MIT-license.
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// See http://olivere.mit-license.org/license.txt for details.
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package elastic
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// CardinalityAggregation is a single-value metrics aggregation that
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// calculates an approximate count of distinct values.
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// Values can be extracted either from specific fields in the document
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// or generated by a script.
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// See: https://www.elastic.co/guide/en/elasticsearch/reference/5.2/search-aggregations-metrics-cardinality-aggregation.html
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type CardinalityAggregation struct {
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field string
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script *Script
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format string
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subAggregations map[string]Aggregation
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meta map[string]interface{}
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precisionThreshold *int64
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rehash *bool
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}
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func NewCardinalityAggregation() *CardinalityAggregation {
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return &CardinalityAggregation{
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subAggregations: make(map[string]Aggregation),
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}
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}
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func (a *CardinalityAggregation) Field(field string) *CardinalityAggregation {
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a.field = field
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return a
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}
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func (a *CardinalityAggregation) Script(script *Script) *CardinalityAggregation {
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a.script = script
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return a
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}
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func (a *CardinalityAggregation) Format(format string) *CardinalityAggregation {
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a.format = format
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return a
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}
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func (a *CardinalityAggregation) SubAggregation(name string, subAggregation Aggregation) *CardinalityAggregation {
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a.subAggregations[name] = subAggregation
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return a
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}
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// Meta sets the meta data to be included in the aggregation response.
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func (a *CardinalityAggregation) Meta(metaData map[string]interface{}) *CardinalityAggregation {
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a.meta = metaData
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return a
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}
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func (a *CardinalityAggregation) PrecisionThreshold(threshold int64) *CardinalityAggregation {
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a.precisionThreshold = &threshold
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return a
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}
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func (a *CardinalityAggregation) Rehash(rehash bool) *CardinalityAggregation {
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a.rehash = &rehash
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return a
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}
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func (a *CardinalityAggregation) Source() (interface{}, error) {
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// Example:
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// {
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// "aggs" : {
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// "author_count" : {
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// "cardinality" : { "field" : "author" }
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// }
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// }
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// }
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// This method returns only the "cardinality" : { "field" : "author" } part.
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source := make(map[string]interface{})
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opts := make(map[string]interface{})
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source["cardinality"] = opts
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// ValuesSourceAggregationBuilder
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if a.field != "" {
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opts["field"] = a.field
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}
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if a.script != nil {
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src, err := a.script.Source()
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if err != nil {
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return nil, err
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}
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opts["script"] = src
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}
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if a.format != "" {
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opts["format"] = a.format
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}
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if a.precisionThreshold != nil {
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opts["precision_threshold"] = *a.precisionThreshold
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}
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if a.rehash != nil {
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opts["rehash"] = *a.rehash
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}
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// AggregationBuilder (SubAggregations)
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if len(a.subAggregations) > 0 {
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aggsMap := make(map[string]interface{})
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source["aggregations"] = aggsMap
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for name, aggregate := range a.subAggregations {
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src, err := aggregate.Source()
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if err != nil {
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return nil, err
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}
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aggsMap[name] = src
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}
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}
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// Add Meta data if available
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if len(a.meta) > 0 {
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source["meta"] = a.meta
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}
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return source, nil
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}
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