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/response.go

@@ -0,0 +1,43 @@
+// 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 (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+)
+
+// Response represents a response from Elasticsearch.
+type Response struct {
+	// StatusCode is the HTTP status code, e.g. 200.
+	StatusCode int
+	// Header is the HTTP header from the HTTP response.
+	// Keys in the map are canonicalized (see http.CanonicalHeaderKey).
+	Header http.Header
+	// Body is the deserialized response body.
+	Body json.RawMessage
+}
+
+// newResponse creates a new response from the HTTP response.
+func (c *Client) newResponse(res *http.Response) (*Response, error) {
+	r := &Response{
+		StatusCode: res.StatusCode,
+		Header:     res.Header,
+	}
+	if res.Body != nil {
+		slurp, err := ioutil.ReadAll(res.Body)
+		if err != nil {
+			return nil, err
+		}
+		// HEAD requests return a body but no content
+		if len(slurp) > 0 {
+			if err := c.decoder.Decode(slurp, &r.Body); err != nil {
+				return nil, err
+			}
+		}
+	}
+	return r, nil
+}