add cluster ok value and checks

app/app.go

@@ -76,6 +76,11 @@ func Run() {
 	})
 
 	router.GET("/", func(c *gin.Context) {
+		if !cluster.OK {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "cluster state is invalid"})
+			return
+		}
+
 		v, err := cluster.Get()
 		if err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
@@ -87,10 +92,13 @@ func Run() {
 	})
 
 	router.GET("/nodes/:node", func(c *gin.Context) {
+		if !cluster.OK {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "cluster state is invalid"})
+			return
+		}
+
 		nodeid := c.Param("node")
-
 		node, err := cluster.GetNode(nodeid)
-
 		if err != nil {
 			c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
 			return
@@ -101,15 +109,18 @@ func Run() {
 	})
 
 	router.GET("/nodes/:node/instances/:vmid", func(c *gin.Context) {
+		if !cluster.OK {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "cluster state is invalid"})
+			return
+		}
+
 		nodeid := c.Param("node")
 		vmid, err := strconv.ParseUint(c.Param("vmid"), 10, 64)
 		if err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("%s could not be converted to vmid (uint)", c.Param("instance"))})
 			return
 		}
-
 		node, err := cluster.GetNode(nodeid)
-
 		if err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 			return

app/model.go

@@ -20,8 +20,11 @@ func (cluster *Cluster) Get() (*Cluster, error) {
 	// aquire cluster lock
 	cluster.lock.Lock()
 	defer cluster.lock.Unlock()
-
-	return cluster, nil
+	if cluster.OK {
+		return cluster, nil
+	} else {
+		return nil, fmt.Errorf("cluster state is invalid")
+	}
 }
 
 // hard sync cluster
@@ -29,6 +32,8 @@ func (cluster *Cluster) Sync() error {
 	// aquire lock on cluster, release on return
 	cluster.lock.Lock()
 
+	cluster.OK = false
+
 	cluster.Nodes = make(map[string]*Node)
 
 	wg, _ := errgroup.WithContext(context.Background())
@@ -68,6 +73,10 @@ func (cluster *Cluster) Sync() error {
 		return err
 	}
 
+	cluster.lock.Lock()
+	cluster.OK = true
+	cluster.lock.Unlock()
+
 	return nil
 }
 
@@ -110,6 +119,7 @@ func (cluster *Cluster) GetNode(hostName string) (*Node, error) {
 	// aquire cluster lock
 	cluster.lock.Lock()
 	defer cluster.lock.Unlock()
+
 	// get host
 	host, ok := cluster.Nodes[hostName]
 	if !ok {
@@ -202,10 +212,10 @@ func (cluster *Cluster) RebuildNode(hostName string) error {
 }
 
 func (host *Node) GetInstance(vmid uint) (*Instance, error) {
-
 	// aquire host lock
 	host.lock.Lock()
 	defer host.lock.Unlock()
+
 	// get instance
 	instance, ok := host.Instances[InstanceID(vmid)]
 	if !ok {

app/proxmox.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/tls"
 	"fmt"
+	"maps"
 	"net/http"
 	"strconv"
 	"strings"
@@ -200,9 +201,7 @@ func (host *Node) VirtualMachine(VMID uint) (*Instance, error) {
 
 func MergeVMDisksAndUnused(vmc *proxmox.VirtualMachineConfig) map[string]string {
 	mergedDisks := vmc.MergeDisks()
-	for k, v := range vmc.Unuseds {
-		mergedDisks[k] = v
-	}
+	maps.Copy(mergedDisks, vmc.Unuseds)
 	return mergedDisks
 }
 
@@ -247,12 +246,8 @@ func (host *Node) Container(VMID uint) (*Instance, error) {
 
 func MergeCTDisksAndUnused(cc *proxmox.ContainerConfig) map[string]string {
 	mergedDisks := make(map[string]string)
-	for k, v := range cc.Unuseds {
-		mergedDisks[k] = v
-	}
-	for k, v := range cc.Mps {
-		mergedDisks[k] = v
-	}
+	maps.Copy(mergedDisks, cc.Unuseds)
+	maps.Copy(mergedDisks, cc.Mps)
 	mergedDisks["rootfs"] = cc.RootFS
 	return mergedDisks
 }

app/types.go

@@ -17,6 +17,7 @@ type Cluster struct {
 	lock  sync.Mutex
 	pve   ProxmoxClient
 	Nodes map[string]*Node `json:"nodes"`
+	OK    bool
 }
 
 // add mutex and pve api Node object