check new version on start (#94)

Signed-off-by: Maksim Paskal <[email protected]>

.golangci.yml

@@ -11,4 +11,5 @@ linters:
   - exhaustruct
   - varnamelen
   - musttag
-  - depguard
+  - depguard
+  - gochecknoglobals

cmd/main.go

@@ -25,13 +25,15 @@ import (
 	"github.com/maksim-paskal/hcloud-k8s-ctl/internal"
 	"github.com/maksim-paskal/hcloud-k8s-ctl/pkg/api"
 	"github.com/maksim-paskal/hcloud-k8s-ctl/pkg/config"
+	"github.com/maksim-paskal/hcloud-k8s-ctl/pkg/version"
 	log "github.com/sirupsen/logrus"
 )
 
 //nolint:gochecknoglobals
 var (
-	gitVersion  = "dev"
-	versionFlag = flag.Bool("version", false, "version")
+	gitVersion      = "dev"
+	versionFlag     = flag.Bool("version", false, "version")
+	checkNewVersion = flag.Bool("check-new-version", true, "check new version")
 )
 
 func main() { //nolint:cyclop,funlen
@@ -59,6 +61,12 @@ func main() { //nolint:cyclop,funlen
 
 	log.SetLevel(logLevel)
 
+	if *checkNewVersion {
+		if err := version.CheckLatest(ctx, gitVersion); err != nil {
+			log.WithError(err).Warn("error check latest version")
+		}
+	}
+
 	if err := config.Check(); err != nil {
 		log.WithError(err).Fatal("error checking config")
 	}

go.mod

@@ -3,6 +3,7 @@ module github.com/maksim-paskal/hcloud-k8s-ctl
 go 1.21
 
 require (
+	github.com/hashicorp/go-version v1.6.0
 	github.com/hetznercloud/hcloud-go/v2 v2.5.1
 	github.com/pkg/errors v0.9.1
 	github.com/sirupsen/logrus v1.9.3

go.sum

@@ -38,6 +38,8 @@ github.com/google/pprof v0.0.0-20210720184732-4bb14d4b1be1 h1:K6RDEckDVWvDI9JAJY
 github.com/google/pprof v0.0.0-20210720184732-4bb14d4b1be1/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/hashicorp/go-version v1.6.0 h1:feTTfFNnjP967rlCxM/I9g701jU+RN74YKx2mOkIeek=
+github.com/hashicorp/go-version v1.6.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hetznercloud/hcloud-go/v2 v2.5.1 h1:tJQxd+Qyd9CwGOFL0og80zZ3a4Z5p9+iIRTnUPlvOgc=
 github.com/hetznercloud/hcloud-go/v2 v2.5.1/go.mod h1:y75vdFT0eNNnYyGWO55Qv0LI23kSgsQZl3Gyy0KMrI4=
 github.com/imdario/mergo v0.3.6 h1:xTNEAn+kxVO7dTZGu0CegyqKZmoWFI0rF8UxjlB2d28=

pkg/version/version.go

@@ -0,0 +1,74 @@
+/*
+Copyright [email protected]
+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 version
+
+import (
+	"context"
+	"net/http"
+	"strings"
+	"time"
+
+	semver "github.com/hashicorp/go-version"
+	"github.com/pkg/errors"
+	log "github.com/sirupsen/logrus"
+)
+
+var versionClient = http.Client{
+	CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		return http.ErrUseLastResponse
+	},
+}
+
+const (
+	httpTimeout         = 10 * time.Second
+	githubURL           = "https://github.com/maksim-paskal/hcloud-k8s-ctl"
+	githubVersionLatest = githubURL + "/releases/latest"
+	githubVersionPrefix = githubURL + "/releases/tag/"
+)
+
+func CheckLatest(ctx context.Context, myVersion string) error {
+	ctx, cancel := context.WithTimeout(ctx, httpTimeout)
+	defer cancel()
+
+	currentVersion, err := semver.NewSemver(myVersion)
+	if err != nil {
+		return errors.Wrap(err, "error parse version")
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, githubVersionLatest, nil)
+	if err != nil {
+		return errors.Wrap(err, "error create request")
+	}
+
+	resp, err := versionClient.Do(req)
+	if err != nil {
+		return errors.Wrap(err, "error do request")
+	}
+
+	defer resp.Body.Close()
+
+	versionURL := resp.Header.Get("Location")
+
+	latestTag := strings.TrimPrefix(versionURL, githubVersionPrefix)
+
+	versionGithub, err := semver.NewSemver(latestTag)
+	if err != nil {
+		return errors.Wrap(err, "error parse version")
+	}
+
+	if currentVersion.Core().LessThan(versionGithub) {
+		log.Infof("new version available: %s", versionURL)
+	}
+
+	return nil
+}

pkg/version/version_test.go

@@ -0,0 +1,29 @@
+/*
+Copyright [email protected]
+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 version_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/maksim-paskal/hcloud-k8s-ctl/pkg/version"
+)
+
+func TestVersion(t *testing.T) {
+	t.Parallel()
+
+	err := version.CheckLatest(context.TODO(), "0.3.0-86191bc-1701335786")
+	if err != nil {
+		t.Fatal(err)
+	}
+}