Merge pull request #33 from TheThingsNetwork/fix/versions

Update Go to 1.11 and Alpine to 3.8; fix fmt/vet issues

.gitlab-ci.yml

@@ -17,7 +17,7 @@ before_script:
 
 tests:
   stage: test
-  image: golang:1.8
+  image: golang:1.11
   services:
     - thethingsnetwork/rabbitmq
     - redis
@@ -33,7 +33,7 @@ tests:
 
 binaries:
   stage: build
-  image: golang:latest
+  image: golang:1.11
   script:
     - mkdir release
     - export CI_BUILD_DATE=$(date -u +%Y-%m-%dT%H:%M:%SZ)
@@ -58,7 +58,7 @@ sign:
     - master@thethingsnetwork/gateway-connector-bridge
     - develop@thethingsnetwork/gateway-connector-bridge
   stage: sign
-  image: golang:latest
+  image: golang:1.11
   script:
     - pushd release
     - shasum -a 256 $(ls) > checksums

.travis.yml

@@ -6,7 +6,7 @@ services:
   - docker
 
 go:
-  - 1.8
+  - "1.11"
 
 cache:
   directories:

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine
+FROM alpine:3.8
 RUN apk --update --no-cache add ca-certificates
 ADD ./release/gateway-connector-bridge-linux-amd64 /usr/local/bin/gateway-connector-bridge
 ADD ./assets ./assets

README.md

@@ -86,7 +86,7 @@ The Things Network's `gateway-connector` protocol sends protocol buffers over MQ
 
 ## Development
 
-- Make sure you have [Go](https://golang.org) installed (version 1.7 or later).
+- Make sure you have [Go](https://golang.org) installed (recommended version 1.11, version 1.8 or later is known to work).
 - Set up your [Go environment](https://golang.org/doc/code.html#GOPATH).
 - Make sure you have [Redis](http://redis.io/download) **installed** and **running**.
 - Make sure you have [RabbitMQ](https://www.rabbitmq.com/download.html) and its [MQTT plugin](https://www.rabbitmq.com/mqtt.html) **installed** and **running**.

backend/pktfwd/backend.go

@@ -554,14 +554,14 @@ func newRXPacketFromRXPK(mac lorawan.EUI64, rxpk RXPK) (*types.UplinkMessage, er
 				rxPacket.Message.GatewayMetadata.RSSI = float32(sig.RSSIS)
 			}
 			antenna := &pb_gateway.RxMetadata_Antenna{
-				Antenna:     uint32(sig.Ant),
-				Channel:     uint32(sig.Chan),
-				ChannelRSSI: float32(sig.RSSIC),
-				RSSI:        float32(sig.RSSIS),
+				Antenna:               uint32(sig.Ant),
+				Channel:               uint32(sig.Chan),
+				ChannelRSSI:           float32(sig.RSSIC),
+				RSSI:                  float32(sig.RSSIS),
 				RSSIStandardDeviation: float32(sig.RSSISD),
-				SNR:             float32(sig.LSNR),
-				FrequencyOffset: int64(sig.FOff),
-				FineTime:        sig.FTime,
+				SNR:                   float32(sig.LSNR),
+				FrequencyOffset:       int64(sig.FOff),
+				FineTime:              sig.FTime,
 			}
 			if eTime, err := base64.StdEncoding.DecodeString(sig.ETime); err == nil && len(eTime) > 0 {
 				antenna.EncryptedTime = eTime

backend/pktfwd/backend_test.go

@@ -314,9 +314,9 @@ func TestBackend(t *testing.T) {
 							},
 						},
 						GatewayConfiguration: pb_gateway.TxConfiguration{
-							Timestamp: 12345,
-							Frequency: 868100000,
-							Power:     14,
+							Timestamp:             12345,
+							Frequency:             868100000,
+							Power:                 14,
 							PolarizationInversion: true,
 						},
 						Payload: []byte{1, 2, 3, 4},
@@ -444,9 +444,9 @@ func TestNewTXPKFromTXPacket(t *testing.T) {
 					},
 				},
 				GatewayConfiguration: pb_gateway.TxConfiguration{
-					Timestamp: 12345,
-					Frequency: 868100000,
-					Power:     14,
+					Timestamp:             12345,
+					Frequency:             868100000,
+					Power:                 14,
 					PolarizationInversion: true,
 				},
 				Payload: []byte{1, 2, 3, 4},

exchange/exchange.go

@@ -20,6 +20,7 @@ import (
 	"github.com/TheThingsNetwork/gateway-connector-bridge/types"
 	"github.com/apex/log"
 	"github.com/deckarep/golang-set"
+	"github.com/spf13/viper"
 )
 
 // Exchange routes messages between northbound backends (servers that are up the chain)
@@ -75,6 +76,7 @@ func New(ctx log.Interface, killWhenIdleFor time.Duration) *Exchange {
 		gateways:        mapset.NewSet(),
 		killWhenIdleFor: killWhenIdleFor,
 	}
+	info.WithLabelValues(viper.GetString("buildDate"), viper.GetString("gitCommit"), viper.GetString("id"), viper.GetString("version")).Set(1)
 	if killWhenIdleFor > 0 {
 		e.idleWatchdog = time.AfterFunc(killWhenIdleFor, func() {
 			ctx.Fatalf("Exchange was idle for more than %v", killWhenIdleFor)

exchange/metrics.go

@@ -9,6 +9,17 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 )
 
+var info = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Namespace: "ttn",
+		Subsystem: "bridge",
+		Name:      "info",
+		Help:      "Information about the TTN environment.",
+	}, []string{
+		"build_date", "git_commit", "id", "version",
+	},
+)
+
 var connectedGateways = prometheus.NewGauge(
 	prometheus.GaugeOpts{
 		Namespace: "ttn",
@@ -73,6 +84,7 @@ func registerStatus() {
 }
 
 func init() {
+	prometheus.MustRegister(info)
 	prometheus.MustRegister(connectedGateways)
 	prometheus.MustRegister(handledCounter)
 	for mType := lorawan.MType(0); mType < 8; mType++ {