Add healthcheck endpoint

backend/liveness/liveness.go

@@ -0,0 +1,54 @@
+package liveness
+
+import (
+	"net/http"
+	"sync"
+
+	"github.com/gin-gonic/gin"
+)
+
+type HealthCheck interface {
+	SetStatus(status string)
+	GetStatus() string
+	HealthCheckHandler() gin.HandlerFunc
+}
+
+type healthCheck struct {
+	status string
+	sync   sync.Mutex
+}
+
+func New() HealthCheck {
+	return &healthCheck{
+		status: "ok",
+	}
+}
+
+func (hc *healthCheck) SetStatus(status string) {
+	hc.sync.Lock()
+	defer hc.sync.Unlock()
+
+	hc.status = status
+}
+
+func (hc *healthCheck) GetStatus() string {
+	hc.sync.Lock()
+	defer hc.sync.Unlock()
+
+	return hc.status
+}
+
+func (hc *healthCheck) HealthCheckHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		switch hc.GetStatus() {
+		case "nok":
+			c.JSON(http.StatusInternalServerError, gin.H{
+				"status": hc.GetStatus(),
+			})
+		default:
+			c.JSON(http.StatusOK, gin.H{
+				"status": hc.GetStatus(),
+			})
+		}
+	}
+}