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_queries_indices.go

@@ -0,0 +1,89 @@
+// 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
+
+// IndicesQuery can be used when executed across multiple indices, allowing
+// to have a query that executes only when executed on an index that matches
+// a specific list of indices, and another query that executes when it is
+// executed on an index that does not match the listed indices.
+//
+// For more details, see
+// https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-indices-query.html
+type IndicesQuery struct {
+	query            Query
+	indices          []string
+	noMatchQueryType string
+	noMatchQuery     Query
+	queryName        string
+}
+
+// NewIndicesQuery creates and initializes a new indices query.
+func NewIndicesQuery(query Query, indices ...string) *IndicesQuery {
+	return &IndicesQuery{
+		query:   query,
+		indices: indices,
+	}
+}
+
+// NoMatchQuery sets the query to use when it executes on an index that
+// does not match the indices provided.
+func (q *IndicesQuery) NoMatchQuery(query Query) *IndicesQuery {
+	q.noMatchQuery = query
+	return q
+}
+
+// NoMatchQueryType sets the no match query which can be either all or none.
+func (q *IndicesQuery) NoMatchQueryType(typ string) *IndicesQuery {
+	q.noMatchQueryType = typ
+	return q
+}
+
+// QueryName sets the query name for the filter.
+func (q *IndicesQuery) QueryName(queryName string) *IndicesQuery {
+	q.queryName = queryName
+	return q
+}
+
+// Source returns JSON for the function score query.
+func (q *IndicesQuery) Source() (interface{}, error) {
+	// {
+	//	 "indices" : {
+	//		 "indices" : ["index1", "index2"],
+	//     "query" : {
+	//       "term" : { "tag" : "wow" }
+	//     },
+	//     "no_match_query" : {
+	//       "term" : { "tag" : "kow" }
+	//     }
+	//	 }
+	// }
+
+	source := make(map[string]interface{})
+	params := make(map[string]interface{})
+	source["indices"] = params
+
+	params["indices"] = q.indices
+
+	src, err := q.query.Source()
+	if err != nil {
+		return nil, err
+	}
+	params["query"] = src
+
+	if q.noMatchQuery != nil {
+		src, err := q.noMatchQuery.Source()
+		if err != nil {
+			return nil, err
+		}
+		params["no_match_query"] = src
+	} else if q.noMatchQueryType != "" {
+		params["no_match_query"] = q.noMatchQueryType
+	}
+	if q.queryName != "" {
+		params["_name"] = q.queryName
+	}
+
+	return source, nil
+}