Vendor psutils and remove neko

plugins/system/ps/net/net_linux.go

@@ -0,0 +1,91 @@
+// +build linux
+
+package net
+
+import (
+	"strconv"
+	"strings"
+
+	common "github.com/shirou/gopsutil/common"
+)
+
+// NetIOCounters returnes network I/O statistics for every network
+// interface installed on the system.  If pernic argument is false,
+// return only sum of all information (which name is 'all'). If true,
+// every network interface installed on the system is returned
+// separately.
+func NetIOCounters(pernic bool) ([]NetIOCountersStat, error) {
+	filename := "/proc/net/dev"
+	lines, err := common.ReadLines(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	statlen := len(lines) - 1
+
+	ret := make([]NetIOCountersStat, 0, statlen)
+
+	for _, line := range lines[2:] {
+		parts := strings.SplitN(line, ":", 2)
+		if len(parts) != 2 {
+			continue
+		}
+		interfaceName := strings.TrimSpace(parts[0])
+		if interfaceName == "" {
+			continue
+		}
+
+		fields := strings.Fields(strings.TrimSpace(parts[1]))
+		bytesRecv, err := strconv.ParseUint(fields[0], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		packetsRecv, err := strconv.ParseUint(fields[1], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		errIn, err := strconv.ParseUint(fields[2], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		dropIn, err := strconv.ParseUint(fields[3], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		bytesSent, err := strconv.ParseUint(fields[8], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		packetsSent, err := strconv.ParseUint(fields[9], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		errOut, err := strconv.ParseUint(fields[10], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		dropOut, err := strconv.ParseUint(fields[13], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+
+		nic := NetIOCountersStat{
+			Name:        interfaceName,
+			BytesRecv:   bytesRecv,
+			PacketsRecv: packetsRecv,
+			Errin:       errIn,
+			Dropin:      dropIn,
+			BytesSent:   bytesSent,
+			PacketsSent: packetsSent,
+			Errout:      errOut,
+			Dropout:     dropOut,
+		}
+		ret = append(ret, nic)
+	}
+
+	if pernic == false {
+		return getNetIOCountersAll(ret)
+	}
+
+	return ret, nil
+}