Add BuildInfo service and template data extension

service/build/info.go

@@ -0,0 +1,7 @@
+package build
+
+type Info struct {
+	ProjectVersion string
+	GitRef         string
+	BuildDate      string
+}

service/build/service.go

@@ -0,0 +1,43 @@
+package build
+
+import (
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/service"
+)
+
+const (
+	ServiceName service.Name = "build"
+)
+
+func ServiceProvider(projectVersion, gitRef, buildDate string) service.Provider {
+	info := &Info{projectVersion, gitRef, buildDate}
+
+	return func(ctn *service.Container) (interface{}, error) {
+		return info, nil
+	}
+}
+
+// From retrieves the build informations in the given service container
+func From(container *service.Container) (*Info, error) {
+	service, err := container.Service(ServiceName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
+	}
+
+	srv, ok := service.(*Info)
+	if !ok {
+		return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
+	}
+
+	return srv, nil
+}
+
+// Must retrieves the user repository in the given service container or panic otherwise
+func Must(container *service.Container) *Info {
+	srv, err := From(container)
+	if err != nil {
+		panic(err)
+	}
+
+	return srv
+}

service/template/data.go

@@ -1,5 +1,12 @@
 package template
 
+import (
+	"net/http"
+
+	"gitlab.com/wpetit/goweb/service"
+	"gitlab.com/wpetit/goweb/service/build"
+)
+
 // Data is some data to inject into the template
 type Data map[string]interface{}
 
@@ -17,3 +24,14 @@ func Extend(data Data, extensions ...DataExtFunc) (Data, error) {
 	}
 	return data, nil
 }
+
+func WithBuildInfo(w http.ResponseWriter, r *http.Request, ctn *service.Container) DataExtFunc {
+	return func(data Data) (Data, error) {
+		info, err := build.From(ctn)
+		if err != nil {
+			return nil, err
+		}
+		data["BuildInfo"] = info
+		return data, nil
+	}
+}