Update notification in logs, see docs for more info

cmd/OliveTin/main.go

@@ -4,6 +4,7 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	grpcapi "github.com/jamesread/OliveTin/internal/grpcapi"
+	updatecheck "github.com/jamesread/OliveTin/internal/updatecheck"
 
 	"github.com/jamesread/OliveTin/internal/httpservers"
 
@@ -57,7 +58,9 @@ func init() {
 func main() {
 	log.Info("OliveTin started")
 
-	log.Debugf("%+v", cfg)
+	log.Debugf("Config: %+v", cfg)
+
+	go updatecheck.CheckForUpdate(version, commit, cfg)
 
 	go grpcapi.Start(cfg)
 

go.mod

@@ -3,6 +3,8 @@ module github.com/jamesread/OliveTin
 go 1.15
 
 require (
+	github.com/denisbrodbeck/machineid v1.0.1 // indirect
+	github.com/go-co-op/gocron v1.6.2 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.4.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/viper v1.7.1

internal/updatecheck/updateCheck.go

@@ -0,0 +1,79 @@
+package updatecheck
+
+import (
+	config "github.com/jamesread/OliveTin/internal/config"
+	log "github.com/sirupsen/logrus"
+	"github.com/denisbrodbeck/machineid"
+	"github.com/go-co-op/gocron"
+	"runtime"
+	"net/http"
+	"encoding/json"
+	"bytes"
+	"time"
+	"io/ioutil"
+)
+
+type UpdateRequest struct {
+	CurrentVersion string
+	CurrentCommit string
+	OS string
+	Arch string
+	MachineId string
+}
+
+func machineId() string {
+	v, err := machineid.ProtectedID("OliveTin")
+
+	if err != nil {
+		log.Warnf("Error getting machine ID: %v", err)
+		return "?"
+	}
+
+	return v;
+}
+
+func CheckForUpdate(currentVersion string, currentCommit string, cfg *config.Config) {
+	payload := UpdateRequest {
+		CurrentVersion: currentVersion,
+		CurrentCommit: currentCommit,
+		OS: runtime.GOOS,
+		Arch: runtime.GOARCH,
+		MachineId: machineId(),
+	}
+
+	s := gocron.NewScheduler(time.UTC)
+
+	s.Every(7).Days().Do(func() {
+		actualCheckForUpdate(payload)
+	})
+
+	s.StartAsync()
+}
+
+func actualCheckForUpdate(payload UpdateRequest) {
+	jsonUpdateRequest, err := json.Marshal(payload)
+
+	req, err := http.NewRequest("POST", "http://update-check.olivetin.app", bytes.NewReader(jsonUpdateRequest))
+
+	if err != nil {
+		log.Errorf("Update check failed %v", err)
+		return
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+
+	if err != nil {
+		log.Errorf("Update check failed %v", err)
+	} else {
+		newVersion, _ := ioutil.ReadAll(resp.Body)
+
+		log.WithFields(log.Fields {
+			"NewVersion": string(newVersion),
+		}).Infof("Update check complete");
+
+		defer resp.Body.Close();
+	}
+
+}