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/delete.go

@@ -0,0 +1,213 @@
+// 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"
+
+	"gopkg.in/olivere/elastic.v3/uritemplates"
+)
+
+// DeleteService allows to delete a typed JSON document from a specified
+// index based on its id.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-delete.html
+// for details.
+type DeleteService struct {
+	client      *Client
+	pretty      bool
+	id          string
+	index       string
+	typ         string
+	routing     string
+	timeout     string
+	version     interface{}
+	versionType string
+	consistency string
+	parent      string
+	refresh     *bool
+	replication string
+}
+
+// NewDeleteService creates a new DeleteService.
+func NewDeleteService(client *Client) *DeleteService {
+	return &DeleteService{
+		client: client,
+	}
+}
+
+// Type is the type of the document.
+func (s *DeleteService) Type(typ string) *DeleteService {
+	s.typ = typ
+	return s
+}
+
+// Id is the document ID.
+func (s *DeleteService) Id(id string) *DeleteService {
+	s.id = id
+	return s
+}
+
+// Index is the name of the index.
+func (s *DeleteService) Index(index string) *DeleteService {
+	s.index = index
+	return s
+}
+
+// Replication specifies a replication type.
+func (s *DeleteService) Replication(replication string) *DeleteService {
+	s.replication = replication
+	return s
+}
+
+// Routing is a specific routing value.
+func (s *DeleteService) Routing(routing string) *DeleteService {
+	s.routing = routing
+	return s
+}
+
+// Timeout is an explicit operation timeout.
+func (s *DeleteService) Timeout(timeout string) *DeleteService {
+	s.timeout = timeout
+	return s
+}
+
+// Version is an explicit version number for concurrency control.
+func (s *DeleteService) Version(version interface{}) *DeleteService {
+	s.version = version
+	return s
+}
+
+// VersionType is a specific version type.
+func (s *DeleteService) VersionType(versionType string) *DeleteService {
+	s.versionType = versionType
+	return s
+}
+
+// Consistency defines a specific write consistency setting for the operation.
+func (s *DeleteService) Consistency(consistency string) *DeleteService {
+	s.consistency = consistency
+	return s
+}
+
+// Parent is the ID of parent document.
+func (s *DeleteService) Parent(parent string) *DeleteService {
+	s.parent = parent
+	return s
+}
+
+// Refresh the index after performing the operation.
+func (s *DeleteService) Refresh(refresh bool) *DeleteService {
+	s.refresh = &refresh
+	return s
+}
+
+// Pretty indicates that the JSON response be indented and human readable.
+func (s *DeleteService) Pretty(pretty bool) *DeleteService {
+	s.pretty = pretty
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *DeleteService) buildURL() (string, url.Values, error) {
+	// Build URL
+	path, err := uritemplates.Expand("/{index}/{type}/{id}", map[string]string{
+		"index": s.index,
+		"type":  s.typ,
+		"id":    s.id,
+	})
+	if err != nil {
+		return "", url.Values{}, err
+	}
+
+	// Add query string parameters
+	params := url.Values{}
+	if s.pretty {
+		params.Set("pretty", "1")
+	}
+	if s.refresh != nil {
+		params.Set("refresh", fmt.Sprintf("%v", *s.refresh))
+	}
+	if s.replication != "" {
+		params.Set("replication", s.replication)
+	}
+	if s.routing != "" {
+		params.Set("routing", s.routing)
+	}
+	if s.timeout != "" {
+		params.Set("timeout", s.timeout)
+	}
+	if s.version != nil {
+		params.Set("version", fmt.Sprintf("%v", s.version))
+	}
+	if s.versionType != "" {
+		params.Set("version_type", s.versionType)
+	}
+	if s.consistency != "" {
+		params.Set("consistency", s.consistency)
+	}
+	if s.parent != "" {
+		params.Set("parent", s.parent)
+	}
+	return path, params, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *DeleteService) Validate() error {
+	var invalid []string
+	if s.typ == "" {
+		invalid = append(invalid, "Type")
+	}
+	if s.id == "" {
+		invalid = append(invalid, "Id")
+	}
+	if s.index == "" {
+		invalid = append(invalid, "Index")
+	}
+	if len(invalid) > 0 {
+		return fmt.Errorf("missing required fields: %v", invalid)
+	}
+	return nil
+}
+
+// Do executes the operation.
+func (s *DeleteService) Do() (*DeleteResponse, 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(DeleteResponse)
+	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// -- Result of a delete request.
+
+// DeleteResponse is the outcome of running DeleteService.Do.
+type DeleteResponse struct {
+	// TODO _shards { total, failed, successful }
+	Found   bool   `json:"found"`
+	Index   string `json:"_index"`
+	Type    string `json:"_type"`
+	Id      string `json:"_id"`
+	Version int64  `json:"_version"`
+}