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/notify-amqp.go

@@ -0,0 +1,145 @@
+/*
+ * 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 (
+	"io/ioutil"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/streadway/amqp"
+)
+
+// amqpNotify - represents logrus compatible AMQP hook.
+// All fields represent AMQP configuration details.
+type amqpNotify struct {
+	Enable       bool   `json:"enable"`
+	URL          string `json:"url"`
+	Exchange     string `json:"exchange"`
+	RoutingKey   string `json:"routingKey"`
+	ExchangeType string `json:"exchangeType"`
+	Mandatory    bool   `json:"mandatory"`
+	Immediate    bool   `json:"immediate"`
+	Durable      bool   `json:"durable"`
+	Internal     bool   `json:"internal"`
+	NoWait       bool   `json:"noWait"`
+	AutoDeleted  bool   `json:"autoDeleted"`
+}
+
+type amqpConn struct {
+	params amqpNotify
+	*amqp.Connection
+}
+
+// dialAMQP - dials and returns an amqpConnection instance,
+// for sending notifications. Returns error if amqp logger
+// is not enabled.
+func dialAMQP(amqpL amqpNotify) (amqpConn, error) {
+	if !amqpL.Enable {
+		return amqpConn{}, errNotifyNotEnabled
+	}
+	conn, err := amqp.Dial(amqpL.URL)
+	if err != nil {
+		return amqpConn{}, err
+	}
+	return amqpConn{Connection: conn, params: amqpL}, nil
+}
+
+func newAMQPNotify(accountID string) (*logrus.Logger, error) {
+	amqpL := serverConfig.GetAMQPNotifyByID(accountID)
+
+	// Connect to amqp server.
+	amqpC, err := dialAMQP(amqpL)
+	if err != nil {
+		return nil, err
+	}
+
+	amqpLog := logrus.New()
+
+	// Disable writing to console.
+	amqpLog.Out = ioutil.Discard
+
+	// Add a amqp hook.
+	amqpLog.Hooks.Add(amqpC)
+
+	// Set default JSON formatter.
+	amqpLog.Formatter = new(logrus.JSONFormatter)
+
+	// Successfully enabled all AMQPs.
+	return amqpLog, nil
+}
+
+// Fire is called when an event should be sent to the message broker.k
+func (q amqpConn) Fire(entry *logrus.Entry) error {
+	ch, err := q.Connection.Channel()
+	if err != nil {
+		// Any other error other than connection closed, return.
+		if err != amqp.ErrClosed {
+			return err
+		}
+		// Attempt to connect again.
+		var conn *amqp.Connection
+		conn, err = amqp.Dial(q.params.URL)
+		if err != nil {
+			return err
+		}
+		ch, err = conn.Channel()
+		if err != nil {
+			return err
+		}
+	}
+	defer ch.Close()
+
+	err = ch.ExchangeDeclare(
+		q.params.Exchange,
+		q.params.ExchangeType,
+		q.params.Durable,
+		q.params.AutoDeleted,
+		q.params.Internal,
+		q.params.NoWait,
+		nil,
+	)
+	if err != nil {
+		return err
+	}
+
+	body, err := entry.String()
+	if err != nil {
+		return err
+	}
+
+	err = ch.Publish(
+		q.params.Exchange,
+		q.params.RoutingKey,
+		q.params.Mandatory,
+		q.params.Immediate,
+		amqp.Publishing{
+			ContentType: "application/json",
+			Body:        []byte(body),
+		})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Levels is available logging levels.
+func (q amqpConn) Levels() []logrus.Level {
+	return []logrus.Level{
+		logrus.InfoLevel,
+	}
+}