update project structure

- move agent to /agent
- change /beszel to /src
- update workflows and docker builds

agent/network.go

@@ -0,0 +1,67 @@
+package agent
+
+import (
+	"log/slog"
+	"strings"
+	"time"
+
+	psutilNet "github.com/shirou/gopsutil/v4/net"
+)
+
+func (a *Agent) initializeNetIoStats() {
+	// reset valid network interfaces
+	a.netInterfaces = make(map[string]struct{}, 0)
+
+	// map of network interface names passed in via NICS env var
+	var nicsMap map[string]struct{}
+	nics, nicsEnvExists := GetEnv("NICS")
+	if nicsEnvExists {
+		nicsMap = make(map[string]struct{}, 0)
+		for nic := range strings.SplitSeq(nics, ",") {
+			nicsMap[nic] = struct{}{}
+		}
+	}
+
+	// reset network I/O stats
+	a.netIoStats.BytesSent = 0
+	a.netIoStats.BytesRecv = 0
+
+	// get intial network I/O stats
+	if netIO, err := psutilNet.IOCounters(true); err == nil {
+		a.netIoStats.Time = time.Now()
+		for _, v := range netIO {
+			switch {
+			// skip if nics exists and the interface is not in the list
+			case nicsEnvExists:
+				if _, nameInNics := nicsMap[v.Name]; !nameInNics {
+					continue
+				}
+			// otherwise run the interface name through the skipNetworkInterface function
+			default:
+				if a.skipNetworkInterface(v) {
+					continue
+				}
+			}
+			slog.Info("Detected network interface", "name", v.Name, "sent", v.BytesSent, "recv", v.BytesRecv)
+			a.netIoStats.BytesSent += v.BytesSent
+			a.netIoStats.BytesRecv += v.BytesRecv
+			// store as a valid network interface
+			a.netInterfaces[v.Name] = struct{}{}
+		}
+	}
+}
+
+func (a *Agent) skipNetworkInterface(v psutilNet.IOCountersStat) bool {
+	switch {
+	case strings.HasPrefix(v.Name, "lo"),
+		strings.HasPrefix(v.Name, "docker"),
+		strings.HasPrefix(v.Name, "br-"),
+		strings.HasPrefix(v.Name, "veth"),
+		strings.HasPrefix(v.Name, "bond"),
+		v.BytesRecv == 0,
+		v.BytesSent == 0:
+		return true
+	default:
+		return false
+	}
+}