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/indices_get_aliases.go

@@ -0,0 +1,154 @@
+// 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 AliasesService struct {
+	client  *Client
+	indices []string
+	pretty  bool
+}
+
+func NewAliasesService(client *Client) *AliasesService {
+	builder := &AliasesService{
+		client:  client,
+		indices: make([]string, 0),
+	}
+	return builder
+}
+
+func (s *AliasesService) Pretty(pretty bool) *AliasesService {
+	s.pretty = pretty
+	return s
+}
+
+func (s *AliasesService) Index(indices ...string) *AliasesService {
+	s.indices = append(s.indices, indices...)
+	return s
+}
+
+func (s *AliasesService) Do() (*AliasesResult, error) {
+	var err 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)
+	}
+	path += strings.Join(indexPart, ",")
+
+	// TODO Add types here
+
+	// Search
+	path += "/_aliases"
+
+	// Parameters
+	params := make(url.Values)
+	if s.pretty {
+		params.Set("pretty", fmt.Sprintf("%v", s.pretty))
+	}
+
+	// Get response
+	res, err := s.client.PerformRequest("GET", path, params, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// {
+	//   "indexName" : {
+	//     "aliases" : {
+	//       "alias1" : { },
+	//       "alias2" : { }
+	//     }
+	//   },
+	//   "indexName2" : {
+	//     ...
+	//   },
+	// }
+	indexMap := make(map[string]interface{})
+	if err := s.client.decoder.Decode(res.Body, &indexMap); err != nil {
+		return nil, err
+	}
+
+	// Each (indexName, _)
+	ret := &AliasesResult{
+		Indices: make(map[string]indexResult),
+	}
+	for indexName, indexData := range indexMap {
+		indexOut, found := ret.Indices[indexName]
+		if !found {
+			indexOut = indexResult{Aliases: make([]aliasResult, 0)}
+		}
+
+		// { "aliases" : { ... } }
+		indexDataMap, ok := indexData.(map[string]interface{})
+		if ok {
+			aliasesData, ok := indexDataMap["aliases"].(map[string]interface{})
+			if ok {
+				for aliasName, _ := range aliasesData {
+					aliasRes := aliasResult{AliasName: aliasName}
+					indexOut.Aliases = append(indexOut.Aliases, aliasRes)
+				}
+			}
+		}
+
+		ret.Indices[indexName] = indexOut
+	}
+
+	return ret, nil
+}
+
+// -- Result of an alias request.
+
+type AliasesResult struct {
+	Indices map[string]indexResult
+}
+
+type indexResult struct {
+	Aliases []aliasResult
+}
+
+type aliasResult struct {
+	AliasName string
+}
+
+func (ar AliasesResult) IndicesByAlias(aliasName string) []string {
+	indices := make([]string, 0)
+
+	for indexName, indexInfo := range ar.Indices {
+		for _, aliasInfo := range indexInfo.Aliases {
+			if aliasInfo.AliasName == aliasName {
+				indices = append(indices, indexName)
+			}
+		}
+	}
+
+	return indices
+}
+
+func (ir indexResult) HasAlias(aliasName string) bool {
+	for _, alias := range ir.Aliases {
+		if alias.AliasName == aliasName {
+			return true
+		}
+	}
+	return false
+}