AMQP auto reconnect feature

Closes #207

outputs/amqp/amqp.go

@@ -2,6 +2,8 @@ package amqp
 
 import (
 	"fmt"
+	"log"
+	"sync"
 	"time"
 
 	"github.com/influxdb/influxdb/client"
@@ -18,6 +20,7 @@ type AMQP struct {
 	RoutingTag string `toml:"routing_tag"`
 
 	channel *amqp.Channel
+	sync.Mutex
 }
 
 var sampleConfig = `
@@ -31,6 +34,8 @@ var sampleConfig = `
 `
 
 func (q *AMQP) Connect() error {
+	q.Lock()
+	defer q.Unlock()
 	connection, err := amqp.Dial(q.URL)
 	if err != nil {
 		return err
@@ -53,6 +58,15 @@ func (q *AMQP) Connect() error {
 		return fmt.Errorf("Failed to declare an exchange: %s", err)
 	}
 	q.channel = channel
+	go func() {
+		log.Printf("Closing: %s", <-connection.NotifyClose(make(chan *amqp.Error)))
+		log.Printf("Trying to reconnect")
+		for err := q.Connect(); err != nil; err = q.Connect() {
+			log.Println(err)
+			time.Sleep(10 * time.Second)
+		}
+
+	}()
 	return nil
 }
 
@@ -69,6 +83,8 @@ func (q *AMQP) Description() string {
 }
 
 func (q *AMQP) Write(bp client.BatchPoints) error {
+	q.Lock()
+	defer q.Unlock()
 	if len(bp.Points) == 0 {
 		return nil
 	}