api: Implement bucket notification. (#2271)

* Implement basic S3 notifications through queues

Supports multiple queues and three basic queue types:

1. NilQueue -- messages don't get sent anywhere
2. LogQueue -- messages get logged
3. AmqpQueue -- messages are sent to an AMQP queue

* api: Implement bucket notification.

Supports two different queue types

- AMQP
- ElasticSearch.

* Add support for redis

vendor/gopkg.in/olivere/elastic.v3/search_aggs_metrics_percentiles.go

@@ -0,0 +1,130 @@
+// Copyright 2012-2015 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
+
+// PercentilesAggregation
+// See: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-metrics-percentile-aggregation.html
+type PercentilesAggregation struct {
+	field           string
+	script          *Script
+	format          string
+	subAggregations map[string]Aggregation
+	meta            map[string]interface{}
+	percentiles     []float64
+	compression     *float64
+	estimator       string
+}
+
+func NewPercentilesAggregation() *PercentilesAggregation {
+	return &PercentilesAggregation{
+		subAggregations: make(map[string]Aggregation),
+		percentiles:     make([]float64, 0),
+	}
+}
+
+func (a *PercentilesAggregation) Field(field string) *PercentilesAggregation {
+	a.field = field
+	return a
+}
+
+func (a *PercentilesAggregation) Script(script *Script) *PercentilesAggregation {
+	a.script = script
+	return a
+}
+
+func (a *PercentilesAggregation) Format(format string) *PercentilesAggregation {
+	a.format = format
+	return a
+}
+
+func (a *PercentilesAggregation) SubAggregation(name string, subAggregation Aggregation) *PercentilesAggregation {
+	a.subAggregations[name] = subAggregation
+	return a
+}
+
+// Meta sets the meta data to be included in the aggregation response.
+func (a *PercentilesAggregation) Meta(metaData map[string]interface{}) *PercentilesAggregation {
+	a.meta = metaData
+	return a
+}
+
+func (a *PercentilesAggregation) Percentiles(percentiles ...float64) *PercentilesAggregation {
+	a.percentiles = append(a.percentiles, percentiles...)
+	return a
+}
+
+func (a *PercentilesAggregation) Compression(compression float64) *PercentilesAggregation {
+	a.compression = &compression
+	return a
+}
+
+func (a *PercentilesAggregation) Estimator(estimator string) *PercentilesAggregation {
+	a.estimator = estimator
+	return a
+}
+
+func (a *PercentilesAggregation) Source() (interface{}, error) {
+	// Example:
+	//	{
+	//    "aggs" : {
+	//      "load_time_outlier" : {
+	//           "percentiles" : {
+	//               "field" : "load_time"
+	//           }
+	//       }
+	//    }
+	//	}
+	// This method returns only the
+	//   { "percentiles" : { "field" : "load_time" } }
+	// part.
+
+	source := make(map[string]interface{})
+	opts := make(map[string]interface{})
+	source["percentiles"] = opts
+
+	// ValuesSourceAggregationBuilder
+	if a.field != "" {
+		opts["field"] = a.field
+	}
+	if a.script != nil {
+		src, err := a.script.Source()
+		if err != nil {
+			return nil, err
+		}
+		opts["script"] = src
+	}
+	if a.format != "" {
+		opts["format"] = a.format
+	}
+	if len(a.percentiles) > 0 {
+		opts["percents"] = a.percentiles
+	}
+	if a.compression != nil {
+		opts["compression"] = *a.compression
+	}
+	if a.estimator != "" {
+		opts["estimator"] = a.estimator
+	}
+
+	// AggregationBuilder (SubAggregations)
+	if len(a.subAggregations) > 0 {
+		aggsMap := make(map[string]interface{})
+		source["aggregations"] = aggsMap
+		for name, aggregate := range a.subAggregations {
+			src, err := aggregate.Source()
+			if err != nil {
+				return nil, err
+			}
+			aggsMap[name] = src
+		}
+	}
+
+	// Add Meta data if available
+	if len(a.meta) > 0 {
+		source["meta"] = a.meta
+	}
+
+	return source, nil
+}