Remind users to get new kjudge version (gitea-104)

Refactor admin/home a bit

fix typo and error handler

add lastUpdate to avoid getting too frequently

implement a message for admin to get the newest kjudge version

Co-authored-by: Natsu Kagami <[email protected]>
Co-authored-by: Thang Pham <[email protected]>

frontend/html/admin/home.html

@@ -13,6 +13,13 @@
 
 {{ define "admin-content" }}
 <div class="py-4 mx-auto text-4xl">Home</div>
+{{ with .NewVersionMessage }}
+<a href="https://git.nkagami.me/natsukagami/kjudge/wiki/Updating" target="_blank">
+    <div
+        class="p-4 border-orange-800 bg-orange-200 text-orange-600 hover:bg-orange-300 rounded mx-auto text-4xl text-center">
+        {{ . }}</div>
+</a>
+{{ end }}
 {{/* Contests overview */}}
 <div id="contests" class="p-2">
     <div class="text-2xl mx-2 my-4 font-bold">Active Contests</div>

server/admin/home.go

@@ -1,8 +1,10 @@
 package admin
 
 import (
+	"log"
 	"net/http"
 
+	"git.nkagami.me/natsukagami/kjudge/db"
 	"git.nkagami.me/natsukagami/kjudge/models"
 	"github.com/labstack/echo/v4"
 )
@@ -11,17 +13,37 @@ import (
 type HomeCtx struct {
 	Contests []*models.Contest
 	Queue    *models.QueueOverview
+
+	NewVersionMessage string
 }
 
-// Home renders the home page.
-func (g *Group) Home(c echo.Context) error {
-	contests, err := models.GetContestsUnfinished(g.db)
+func getHomeCtx(db db.DBContext, c echo.Context) (*HomeCtx, error) {
+	contests, err := models.GetContestsUnfinished(db)
 	if err != nil {
-		return err
+		return nil, err
+	}
+	queue, err := models.GetQueueOverview(db)
+	if err != nil {
+		return nil, err
+	}
+	message, err := NewVersionMessageGet()
+	if err != nil {
+		log.Printf("Falied to get kjudge's release version: %+v", err)
+		message = ""
 	}
-	queue, err := models.GetQueueOverview(g.db)
+	return &HomeCtx{Contests: contests, Queue: queue, NewVersionMessage: message}, nil
+}
+
+// Render renders the context.
+func (h *HomeCtx) Render(c echo.Context) error {
+	return c.Render(http.StatusOK, "admin/home", h)
+}
+
+// Home renders the home page.
+func (g *Group) Home(c echo.Context) error {
+	ctx, err := getHomeCtx(g.db, c)
 	if err != nil {
 		return err
 	}
-	return c.Render(http.StatusOK, "admin/home", &HomeCtx{Contests: contests, Queue: queue})
+	return ctx.Render(c)
 }

server/admin/message_dev.go

@@ -0,0 +1,8 @@
+// +build !production
+
+package admin
+
+// NewVersionMessageGet checks if there is a new version of kjudge
+func NewVersionMessageGet() (string, error) {
+	return "", nil
+}

server/admin/message_prod.go

@@ -0,0 +1,50 @@
+// +build production
+
+package admin
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"git.nkagami.me/natsukagami/kjudge"
+	"github.com/pkg/errors"
+)
+
+type jsonRelease struct {
+	TagName string `json:"tag_name"`
+}
+
+type version struct {
+	TagName    string
+	LastUpdate time.Time
+}
+
+var currentVersion version
+
+// NewVersionMessageGet checks if there is a new version of kjudge
+func NewVersionMessageGet() (string, error) {
+	if currentVersion.TagName == "" || time.Now().After(currentVersion.LastUpdate.Add(time.Hour)) {
+		response, err := http.Get("https://git.nkagami.me/api/v1/repos/natsukagami/kjudge/releases?page=1&per_page=1")
+		if err != nil {
+			return "", errors.WithStack(err)
+		}
+		defer response.Body.Close()
+		var x []jsonRelease
+		decode := json.NewDecoder(response.Body)
+		if err := decode.Decode(&x); err != nil {
+			return "", errors.WithStack(err)
+		}
+		if len(x) == 0 {
+			return "", errors.New("Found no relase")
+		}
+		currentVersion.TagName = x[0].TagName[1:]
+		currentVersion.LastUpdate = time.Now()
+	}
+	if kjudge.Version != currentVersion.TagName {
+		return fmt.Sprintf("Please update kjudge to the newest version (%s)", currentVersion.TagName), nil
+	} else {
+		return "", nil
+	}
+}