Initial Proxmox dashboard with host and guest metrics

guests.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"os/exec"
+	"sort"
+	"sync"
+	"time"
+)
+
+type GuestMetrics struct {
+	VMID        int     `json:"vmid"`
+	Name        string  `json:"name"`
+	Type        string  `json:"type"`
+	Node        string  `json:"node"`
+	Status      string  `json:"status"`
+	CPU         float64 `json:"cpu"`
+	MaxCPU      float64 `json:"maxcpu"`
+	MemoryBytes uint64  `json:"mem"`
+	MaxMemory   uint64  `json:"maxmem"`
+	Uptime      uint64  `json:"uptime"`
+	Template    int     `json:"template"`
+}
+
+type GuestsMetrics struct {
+	Available bool           `json:"available"`
+	Guests    []GuestMetrics `json:"guests"`
+}
+
+type guestCollector struct {
+	mu        sync.Mutex
+	cached    GuestsMetrics
+	updatedAt time.Time
+}
+
+func (c *guestCollector) collect() GuestsMetrics {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if time.Since(c.updatedAt) < 3*time.Second {
+		return c.cached
+	}
+	c.cached = readGuests()
+	c.updatedAt = time.Now()
+	return c.cached
+}
+
+func readGuests() GuestsMetrics {
+	if _, err := exec.LookPath("pvesh"); err != nil {
+		return GuestsMetrics{}
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	output, err := exec.CommandContext(ctx, "pvesh", "get", "/cluster/resources", "--type", "vm", "--output-format", "json").Output()
+	result := GuestsMetrics{Available: true}
+	if err != nil {
+		return result
+	}
+	if json.Unmarshal(output, &result.Guests) != nil {
+		return result
+	}
+	sort.Slice(result.Guests, func(i, j int) bool {
+		return result.Guests[i].VMID < result.Guests[j].VMID
+	})
+	return result
+}