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/optimize.go

@@ -0,0 +1,129 @@
+// 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
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+
+	"gopkg.in/olivere/elastic.v3/uritemplates"
+)
+
+type OptimizeService struct {
+	client             *Client
+	indices            []string
+	maxNumSegments     *int
+	onlyExpungeDeletes *bool
+	flush              *bool
+	waitForMerge       *bool
+	force              *bool
+	pretty             bool
+}
+
+func NewOptimizeService(client *Client) *OptimizeService {
+	builder := &OptimizeService{
+		client:  client,
+		indices: make([]string, 0),
+	}
+	return builder
+}
+
+func (s *OptimizeService) Index(indices ...string) *OptimizeService {
+	s.indices = append(s.indices, indices...)
+	return s
+}
+
+func (s *OptimizeService) MaxNumSegments(maxNumSegments int) *OptimizeService {
+	s.maxNumSegments = &maxNumSegments
+	return s
+}
+
+func (s *OptimizeService) OnlyExpungeDeletes(onlyExpungeDeletes bool) *OptimizeService {
+	s.onlyExpungeDeletes = &onlyExpungeDeletes
+	return s
+}
+
+func (s *OptimizeService) Flush(flush bool) *OptimizeService {
+	s.flush = &flush
+	return s
+}
+
+func (s *OptimizeService) WaitForMerge(waitForMerge bool) *OptimizeService {
+	s.waitForMerge = &waitForMerge
+	return s
+}
+
+func (s *OptimizeService) Force(force bool) *OptimizeService {
+	s.force = &force
+	return s
+}
+
+func (s *OptimizeService) Pretty(pretty bool) *OptimizeService {
+	s.pretty = pretty
+	return s
+}
+
+func (s *OptimizeService) Do() (*OptimizeResult, error) {
+	// Build url
+	path := "/"
+
+	// Indices part
+	indexPart := make([]string, 0)
+	for _, index := range s.indices {
+		index, err := uritemplates.Expand("{index}", map[string]string{
+			"index": index,
+		})
+		if err != nil {
+			return nil, err
+		}
+		indexPart = append(indexPart, index)
+	}
+	if len(indexPart) > 0 {
+		path += strings.Join(indexPart, ",")
+	}
+
+	path += "/_optimize"
+
+	// Parameters
+	params := make(url.Values)
+	if s.maxNumSegments != nil {
+		params.Set("max_num_segments", fmt.Sprintf("%d", *s.maxNumSegments))
+	}
+	if s.onlyExpungeDeletes != nil {
+		params.Set("only_expunge_deletes", fmt.Sprintf("%v", *s.onlyExpungeDeletes))
+	}
+	if s.flush != nil {
+		params.Set("flush", fmt.Sprintf("%v", *s.flush))
+	}
+	if s.waitForMerge != nil {
+		params.Set("wait_for_merge", fmt.Sprintf("%v", *s.waitForMerge))
+	}
+	if s.force != nil {
+		params.Set("force", fmt.Sprintf("%v", *s.force))
+	}
+	if s.pretty {
+		params.Set("pretty", fmt.Sprintf("%v", s.pretty))
+	}
+
+	// Get response
+	res, err := s.client.PerformRequest("POST", path, params, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Return result
+	ret := new(OptimizeResult)
+	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// -- Result of an optimize request.
+
+type OptimizeResult struct {
+	Shards shardsInfo `json:"_shards,omitempty"`
+}