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_delete.go

@@ -0,0 +1,128 @@
+// 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"
+)
+
+// IndicesDeleteService allows to delete existing indices.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-delete-index.html
+// for details.
+type IndicesDeleteService struct {
+	client        *Client
+	pretty        bool
+	index         []string
+	timeout       string
+	masterTimeout string
+}
+
+// NewIndicesDeleteService creates and initializes a new IndicesDeleteService.
+func NewIndicesDeleteService(client *Client) *IndicesDeleteService {
+	return &IndicesDeleteService{
+		client: client,
+		index:  make([]string, 0),
+	}
+}
+
+// Index adds the list of indices to delete.
+// Use `_all` or `*` string to delete all indices.
+func (s *IndicesDeleteService) Index(index []string) *IndicesDeleteService {
+	s.index = index
+	return s
+}
+
+// Timeout is an explicit operation timeout.
+func (s *IndicesDeleteService) Timeout(timeout string) *IndicesDeleteService {
+	s.timeout = timeout
+	return s
+}
+
+// MasterTimeout specifies the timeout for connection to master.
+func (s *IndicesDeleteService) MasterTimeout(masterTimeout string) *IndicesDeleteService {
+	s.masterTimeout = masterTimeout
+	return s
+}
+
+// Pretty indicates that the JSON response be indented and human readable.
+func (s *IndicesDeleteService) Pretty(pretty bool) *IndicesDeleteService {
+	s.pretty = pretty
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *IndicesDeleteService) buildURL() (string, url.Values, error) {
+	// Build URL
+	path, err := uritemplates.Expand("/{index}", map[string]string{
+		"index": strings.Join(s.index, ","),
+	})
+	if err != nil {
+		return "", url.Values{}, err
+	}
+
+	// Add query string parameters
+	params := url.Values{}
+	if s.pretty {
+		params.Set("pretty", "1")
+	}
+	if s.timeout != "" {
+		params.Set("timeout", s.timeout)
+	}
+	if s.masterTimeout != "" {
+		params.Set("master_timeout", s.masterTimeout)
+	}
+	return path, params, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *IndicesDeleteService) Validate() error {
+	var invalid []string
+	if len(s.index) == 0 {
+		invalid = append(invalid, "Index")
+	}
+	if len(invalid) > 0 {
+		return fmt.Errorf("missing required fields: %v", invalid)
+	}
+	return nil
+}
+
+// Do executes the operation.
+func (s *IndicesDeleteService) Do() (*IndicesDeleteResponse, error) {
+	// Check pre-conditions
+	if err := s.Validate(); err != nil {
+		return nil, err
+	}
+
+	// Get URL for request
+	path, params, err := s.buildURL()
+	if err != nil {
+		return nil, err
+	}
+
+	// Get HTTP response
+	res, err := s.client.PerformRequest("DELETE", path, params, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Return operation response
+	ret := new(IndicesDeleteResponse)
+	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// -- Result of a delete index request.
+
+// IndicesDeleteResponse is the response of IndicesDeleteService.Do.
+type IndicesDeleteResponse struct {
+	Acknowledged bool `json:"acknowledged"`
+}