Add a default version provider

versions/version_provider.go

@@ -0,0 +1,57 @@
+package versions
+
+import (
+	"runtime"
+	"runtime/debug"
+	"time"
+)
+
+type DefaultVersionProvider struct {
+	SourceBranch string
+	VersionInfo
+}
+
+func (v DefaultVersionProvider) Branch() string {
+	return v.SourceBranch
+}
+
+func (v DefaultVersionProvider) EncoderDecoder() VersionEncDec {
+	return &StdVersionEncDec
+}
+
+func (v DefaultVersionProvider) Version() string {
+	return v.VersionInfo.Version
+}
+
+func (v DefaultVersionProvider) BuildDate() string {
+	return v.VersionInfo.BuildDate
+}
+
+func (v DefaultVersionProvider) Revision() string {
+	return v.VersionInfo.Revision
+}
+
+func (v DefaultVersionProvider) AsVersionInfo() *VersionInfo {
+	return &v.VersionInfo
+}
+
+func NewDefaultVersionProvider() VersionProvider {
+	buildInfo, ok := debug.ReadBuildInfo()
+	rev := ""
+	if ok {
+		for _, kv := range buildInfo.Settings {
+			if kv.Key == "vcs.revision" {
+				rev = kv.Value
+			}
+		}
+	}
+	return &DefaultVersionProvider{
+		VersionInfo: VersionInfo{
+			Version:   "v0.0.0",
+			Revision:  rev,
+			BuildDate: time.Now().String(),
+			OS:        runtime.GOOS,
+			Arch:      runtime.GOARCH,
+		},
+	}
+}