fix bug with incomplete cluster model when node is down,

improve various error messages

app/app.go

@@ -25,7 +25,7 @@ func Run() {
 	flag.Parse()
 
 	config := GetConfig(*configPath)
-	log.Println("Initialized config from " + *configPath)
+	log.Printf("Initialized config from %s", *configPath)
 
 	token := fmt.Sprintf(`%s@%s!%s`, config.PVE.Token.USER, config.PVE.Token.REALM, config.PVE.Token.ID)
 	client = NewClient(config.PVE.URL, token, config.PVE.Token.Secret)

app/model.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"fmt"
+	"log"
 	"strconv"
 	"strings"
 )
@@ -26,8 +27,9 @@ func (cluster *Cluster) Sync() error {
 	for _, hostName := range nodes {
 		// rebuild node
 		err := cluster.RebuildHost(hostName)
-		if err != nil {
-			return err
+		if err != nil { // if an error was encountered, continue and log the error
+			log.Print(err.Error())
+			continue
 		}
 	}
 
@@ -66,8 +68,8 @@ func (cluster *Cluster) GetNode(hostName string) (*Node, error) {
 
 func (cluster *Cluster) RebuildHost(hostName string) error {
 	host, err := cluster.pve.Node(hostName)
-	if err != nil {
-		return err
+	if err != nil { // host is probably down or otherwise unreachable
+		return fmt.Errorf("error retrieving %s: %s, possibly down?", hostName, err.Error())
 	}
 
 	// aquire lock on host, release on return
@@ -84,8 +86,9 @@ func (cluster *Cluster) RebuildHost(hostName string) error {
 	}
 	for _, vmid := range vms {
 		err := host.RebuildInstance(VM, vmid)
-		if err != nil {
-			return err
+		if err != nil { // if an error was encountered, continue and log the error
+			log.Print(err.Error())
+			continue
 		}
 	}
 
@@ -147,13 +150,13 @@ func (host *Node) RebuildInstance(instancetype InstanceType, vmid uint) error {
 		var err error
 		instance, err = host.VirtualMachine(vmid)
 		if err != nil {
-			return err
+			return fmt.Errorf("error retrieving %d: %s, possibly down?", vmid, err.Error())
 		}
 	} else if instancetype == CT {
 		var err error
 		instance, err = host.Container(vmid)
 		if err != nil {
-			return err
+			return fmt.Errorf("error retrieving %d: %s, possibly down?", vmid, err.Error())
 		}
 
 	}

app/types.go

@@ -1,6 +1,7 @@
 package app
 
 import (
+	"fmt"
 	"sync"
 
 	"github.com/luthermonson/go-proxmox"
@@ -88,3 +89,24 @@ type Function struct {
 	VendorName   string     `json:"subsystem_vendor_name"`
 	Reserved     bool       `json:"reserved"`
 }
+
+func (cluster *Cluster) String() string {
+	s := "cluster:\n"
+	for _, node := range cluster.Nodes {
+		s += fmt.Sprintf("\t%s", node)
+	}
+	return s
+}
+
+func (node *Node) String() string {
+	s := fmt.Sprintf("%s:\n", node.Name)
+	for vmid, instance := range node.Instances {
+		s += fmt.Sprintf("\t\t%d:%s\n", vmid, instance)
+	}
+	return s
+}
+
+func (instance *Instance) String() string {
+	s := fmt.Sprintf("%s", instance.Name)
+	return s
+}