output amqp: Add ssl support

closes influxdata#536

CHANGELOG.md

@@ -8,6 +8,7 @@
 - [#467](https://github.com/influxdata/telegraf/issues/467): Add option to disable statsd measurement name conversion.
 - [#534](https://github.com/influxdata/telegraf/pull/534): NSQ input plugin. Thanks @allingeek!
 - [#494](https://github.com/influxdata/telegraf/pull/494): Graphite output plugin. Thanks @titilambert!
+- AMQP SSL support. Thanks @ekini!
 
 ### Bugfixes
 - [#506](https://github.com/influxdb/telegraf/pull/506): Ping input doesn't return response time metric when timeout. Thanks @titilambert!

plugins/outputs/amqp/amqp.go

@@ -2,7 +2,10 @@ package amqp
 
 import (
 	"bytes"
+	"crypto/tls"
+	"crypto/x509"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"sync"
 	"time"
@@ -17,6 +20,12 @@ type AMQP struct {
 	URL string
 	// AMQP exchange
 	Exchange string
+	// path to CA file
+	SslCa string
+	// path to host cert file
+	SslCert string
+	// path to cert key file
+	SslKey string
 	// Routing Key Tag
 	RoutingTag string `toml:"routing_tag"`
 	// InfluxDB database
@@ -46,6 +55,11 @@ var sampleConfig = `
   #  ie, if this tag exists, it's value will be used as the routing key
   routing_tag = "host"
 
+  # Use ssl
+  #ssl_ca = "/etc/telegraf/ca.pem"
+  #ssl_cert = "/etc/telegraf/cert.pem"
+  #ssl_key = "/etc/telegraf/key.pem"
+
   # InfluxDB retention policy
   #retention_policy = "default"
   # InfluxDB database
@@ -64,7 +78,32 @@ func (q *AMQP) Connect() error {
 		"retention_policy": q.RetentionPolicy,
 	}
 
-	connection, err := amqp.Dial(q.URL)
+	var connection *amqp.Connection
+	var err error
+	if q.SslCert != "" && q.SslKey != "" {
+		// make new tls config
+		cfg := new(tls.Config)
+		if q.SslCa != "" {
+			// create ca pool
+			cfg.RootCAs = x509.NewCertPool()
+
+			// add self-signed cert
+			if ca, err := ioutil.ReadFile(q.SslCa); err == nil {
+				cfg.RootCAs.AppendCertsFromPEM(ca)
+			} else {
+				log.Println(err)
+			}
+		}
+		if cert, err := tls.LoadX509KeyPair(q.SslCert, q.SslKey); err == nil {
+			cfg.Certificates = append(cfg.Certificates, cert)
+		} else {
+			log.Println(err)
+		}
+		connection, err = amqp.DialTLS(q.URL, cfg)
+
+	} else {
+		connection, err = amqp.Dial(q.URL)
+	}
 	if err != nil {
 		return err
 	}