server: Move all the top level files into cmd folder. (#2490)

This change brings a change which was done for the 'mc'
package to allow for clean repo and have a cleaner
github drop in experience.

cmd/notifiers.go

@@ -0,0 +1,136 @@
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/minio/minio/pkg/wildcard"
+)
+
+// SQS type.
+const (
+	// Minio sqs ARN prefix.
+	minioSqs = "arn:minio:sqs:"
+
+	// Static string indicating queue type 'amqp'.
+	queueTypeAMQP = "amqp"
+	// Static string indicating queue type 'elasticsearch'.
+	queueTypeElastic = "elasticsearch"
+	// Static string indicating queue type 'redis'.
+	queueTypeRedis = "redis"
+)
+
+// Topic type.
+const (
+	// Minio topic ARN prefix.
+	minioTopic = "arn:minio:sns:"
+
+	// Static string indicating sns type 'listen'.
+	snsTypeMinio = "listen"
+)
+
+var errNotifyNotEnabled = errors.New("requested notifier not enabled")
+
+// Notifier represents collection of supported notification queues.
+type notifier struct {
+	AMQP          map[string]amqpNotify          `json:"amqp"`
+	ElasticSearch map[string]elasticSearchNotify `json:"elasticsearch"`
+	Redis         map[string]redisNotify         `json:"redis"`
+	// Add new notification queues.
+}
+
+// Returns true if queueArn is for an AMQP queue.
+func isAMQPQueue(sqsArn arnSQS) bool {
+	if sqsArn.Type != queueTypeAMQP {
+		return false
+	}
+	amqpL := serverConfig.GetAMQPNotifyByID(sqsArn.AccountID)
+	if !amqpL.Enable {
+		return false
+	}
+	// Connect to amqp server to validate.
+	amqpC, err := dialAMQP(amqpL)
+	if err != nil {
+		errorIf(err, "Unable to connect to amqp service. %#v", amqpL)
+		return false
+	}
+	defer amqpC.Close()
+	return true
+}
+
+// Returns true if queueArn is for an Redis queue.
+func isRedisQueue(sqsArn arnSQS) bool {
+	if sqsArn.Type != queueTypeRedis {
+		return false
+	}
+	rNotify := serverConfig.GetRedisNotifyByID(sqsArn.AccountID)
+	if !rNotify.Enable {
+		return false
+	}
+	// Connect to redis server to validate.
+	rPool, err := dialRedis(rNotify)
+	if err != nil {
+		errorIf(err, "Unable to connect to redis service. %#v", rNotify)
+		return false
+	}
+	defer rPool.Close()
+	return true
+}
+
+// Returns true if queueArn is for an ElasticSearch queue.
+func isElasticQueue(sqsArn arnSQS) bool {
+	if sqsArn.Type != queueTypeElastic {
+		return false
+	}
+	esNotify := serverConfig.GetElasticSearchNotifyByID(sqsArn.AccountID)
+	if !esNotify.Enable {
+		return false
+	}
+	elasticC, err := dialElastic(esNotify)
+	if err != nil {
+		errorIf(err, "Unable to connect to elasticsearch service %#v", esNotify)
+		return false
+	}
+	defer elasticC.Stop()
+	return true
+}
+
+// Match function matches wild cards in 'pattern' for events.
+func eventMatch(eventType string, events []string) (ok bool) {
+	for _, event := range events {
+		ok = wildcard.Match(event, eventType)
+		if ok {
+			break
+		}
+	}
+	return ok
+}
+
+// Filter rule match, matches an object against the filter rules.
+func filterRuleMatch(object string, frs []filterRule) bool {
+	var prefixMatch, suffixMatch = true, true
+	for _, fr := range frs {
+		if isValidFilterNamePrefix(fr.Name) {
+			prefixMatch = strings.HasPrefix(object, fr.Value)
+		} else if isValidFilterNameSuffix(fr.Name) {
+			suffixMatch = strings.HasSuffix(object, fr.Value)
+		}
+	}
+	return prefixMatch && suffixMatch
+}