modularize monitor, reduce init usage (#81)

* kill process tree using syscall on windows & cleanup (#80)

* kill process tree using syscall on windows & cleanup

* use job api

* add error check for cmd.Start

* modularize monitor, reduce init usage

* replace slices with sort

* update gopsutil & other dependencies

pkg/monitor/nic/nic.go

@@ -0,0 +1,45 @@
+package nic
+
+import (
+	"context"
+
+	"github.com/shirou/gopsutil/v4/net"
+)
+
+type NICKeyType string
+
+const NICKey NICKeyType = "nic"
+
+var excludeNetInterfaces = map[string]bool{
+	"lo":     true,
+	"tun":    true,
+	"docker": true,
+	"veth":   true,
+	"br-":    true,
+	"vmbr":   true,
+	"vnet":   true,
+	"kube":   true,
+}
+
+func GetState(ctx context.Context) ([]uint64, error) {
+	var netInTransfer, netOutTransfer uint64
+	nc, err := net.IOCountersWithContext(ctx, true)
+	if err != nil {
+		return nil, err
+	}
+
+	allowList := excludeNetInterfaces
+	if m, ok := ctx.Value(NICKey).(map[string]bool); ok && len(m) > 0 {
+		allowList = m
+	}
+
+	for _, v := range nc {
+		if !allowList[v.Name] {
+			continue
+		}
+		netInTransfer += v.BytesRecv
+		netOutTransfer += v.BytesSent
+	}
+
+	return []uint64{netInTransfer, netOutTransfer}, nil
+}