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version.go
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version.go
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package version
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"time"
pb "github.com/linkerd/linkerd2/controller/gen/public"
)
// DO NOT EDIT
// This var is updated automatically as part of the build process
var Version = undefinedVersion
const (
undefinedVersion = "undefined"
versionCheckURL = "https://versioncheck.linkerd.io/version.json"
)
func init() {
// Use `$LINKERD_CONTAINER_VERSION_OVERRIDE` as the version only if the
// version wasn't set at link time to minimize the chance of using it
// unintentionally. This mechanism allows the version to be bound at
// container build time instead of at executable link time to improve
// incremental rebuild efficiency.
if Version == undefinedVersion {
override := os.Getenv("LINKERD_CONTAINER_VERSION_OVERRIDE")
if override != "" {
Version = override
}
}
}
func CheckClientVersion(latestVersion string) error {
if Version != latestVersion {
return fmt.Errorf("is running version %s but the latest version is %s",
Version, latestVersion)
}
return nil
}
func CheckServerVersion(apiClient pb.ApiClient, latestVersion string) error {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
rsp, err := apiClient.Version(ctx, &pb.Empty{})
if err != nil {
return err
}
if rsp.GetReleaseVersion() != latestVersion {
return fmt.Errorf("is running version %s but the latest version is %s",
rsp.GetReleaseVersion(), latestVersion)
}
return nil
}
func GetLatestVersion() (string, error) {
req, err := http.NewRequest("GET", versionCheckURL, nil)
if err != nil {
return "", err
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
rsp, err := http.DefaultClient.Do(req.WithContext(ctx))
if err != nil {
return "", err
}
defer rsp.Body.Close()
if rsp.StatusCode != 200 {
return "", fmt.Errorf("Unexpected versioncheck response: %s", rsp.Status)
}
bytes, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return "", err
}
var versionRsp map[string]string
err = json.Unmarshal(bytes, &versionRsp)
if err != nil {
return "", err
}
return versionRsp["version"], nil
}