/
probe.go
216 lines (207 loc) · 6.24 KB
/
probe.go
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package netif
import (
"bufio"
"fmt"
"os"
"strings"
"time"
"github.com/Cloud-Foundations/health-agent/lib/sysfs"
"github.com/Cloud-Foundations/tricorder/go/tricorder/units"
)
var filename string = "/proc/net/dev"
var sysfsFilenameFormat string = "/sys/class/net/%s/%s"
func (p *prober) probe() error {
for _, netIf := range p.netInterfaces {
netIf.probed = false
}
file, err := os.Open(filename)
if err != nil {
return err
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
if err := p.processNetdevLine(scanner.Text()); err != nil {
return err
}
}
if err := scanner.Err(); err != nil {
return err
}
for name, netIf := range p.netInterfaces {
if !netIf.probed {
delete(p.netInterfaces, name)
netIf.dir.UnregisterDirectory()
}
}
return nil
}
func (p *prober) processNetdevLine(line string) error {
splitLine := strings.SplitN(line, ":", 2)
if len(splitLine) != 2 {
return nil
}
netIfName := strings.TrimSpace(splitLine[0])
netIfData := splitLine[1]
netIf := p.netInterfaces[netIfName]
if netIf == nil {
netIf = new(netInterface)
p.netInterfaces[netIfName] = netIf
var err error
netIf.dir, err = p.dir.RegisterDirectory(netIfName)
if err != nil {
return err
}
netIf.name = netIfName
hwAddress, err := readSysfsString(netIfName, "address")
if err == nil {
if err := netIf.dir.RegisterMetric("address", &hwAddress,
units.None, "hardware (MAC) address"); err != nil {
return err
}
}
netIf.carrier, err = readSysfsBool(netIfName, "carrier")
if err == nil {
if err := netIf.dir.RegisterMetric("carrier", &netIf.carrier,
units.None, "true if carrier detected"); err != nil {
return err
}
}
mtu, err := readSysfsUint64(netIfName, "mtu")
if err == nil {
if err := netIf.dir.RegisterMetric("mtu", &mtu, units.Byte,
"Messate Transfer Unit"); err != nil {
return err
}
}
if err := netIf.dir.RegisterMetric("multicast-frames",
&netIf.multicastFrames, units.None,
"total multicast frames received or transmitted"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("rx-compressed-packets",
&netIf.rxCompressedPackets, units.None,
"compressed packets received"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("rx-data", &netIf.rxData.value,
units.Byte, "bytes received"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("rx-dropped", &netIf.rxDropped,
units.None, "receive packets dropped"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("rx-errors", &netIf.rxErrors,
units.None, "total receive errors"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("rx-frame-errors",
&netIf.rxFrameErrors, units.None,
"receive framing errors"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("rx-overruns", &netIf.rxOverruns,
units.None, "receive overrun errors"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("rx-packets", &netIf.rxPackets.value,
units.None, "total packets received"); err != nil {
return err
}
netIf.speed, err = readSysfsUint64(netIfName, "speed")
if err == nil {
netIf.speed *= 1000000 / 8
if err := netIf.dir.RegisterMetric("speed", &netIf.speed,
units.None, "link speed in Bytes/Second"); err != nil {
return err
}
}
if err := netIf.dir.RegisterMetric("tx-carrier-losses",
&netIf.txCarrierLosses, units.None,
"transmit carrier losses"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("tx-collision-errors",
&netIf.txCollisionErrors, units.None,
"transmit collision errors"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("tx-compressed-packets",
&netIf.txCompressedPackets, units.None,
"compressed packets transmitted"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("tx-data", &netIf.txData.value,
units.Byte, "bytes transmitted"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("tx-dropped", &netIf.txDropped,
units.None, "transmit packets dropped"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("tx-errors", &netIf.txErrors,
units.None, "total transmit errors"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("tx-overruns", &netIf.txOverruns,
units.None, "transmit overrun errors"); err != nil {
return err
}
if err := netIf.dir.RegisterMetric("tx-packets", &netIf.txPackets.value,
units.None, "total packets transmitted"); err != nil {
return err
}
}
netIf.probed = true
nScanned, err := fmt.Sscanf(netIfData,
"%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d",
&netIf.rxData.tmp, &netIf.rxPackets.tmp, &netIf.rxErrors,
&netIf.rxDropped, &netIf.rxOverruns, &netIf.rxFrameErrors,
&netIf.rxCompressedPackets,
&netIf.multicastFrames,
&netIf.txData.tmp, &netIf.txPackets.tmp, &netIf.rxErrors,
&netIf.txDropped, &netIf.txOverruns, &netIf.txCollisionErrors,
&netIf.txCarrierLosses, &netIf.txCompressedPackets)
if err != nil {
return err
}
if nScanned < 16 {
return fmt.Errorf("only read %d values from %s", nScanned, line)
}
// Handle integer overflow.
netIf.rxData.update()
netIf.rxPackets.update()
netIf.txData.update()
netIf.txPackets.update()
netIf.carrier, _ = readSysfsBool(netIfName, "carrier")
currentTime := time.Now()
if !netIf.lastProbeTime.IsZero() {
duration := currentTime.Sub(netIf.lastProbeTime)
netIf.rxDataRate = uint64(float64(netIf.rxData.value-netIf.lastRxData) /
duration.Seconds())
netIf.txDataRate = uint64(float64(netIf.txData.value-netIf.lastTxData) /
duration.Seconds())
}
netIf.lastProbeTime = currentTime
netIf.lastRxData = netIf.rxData.value
netIf.lastTxData = netIf.txData.value
return nil
}
func (wi *wrappingInt) update() {
if wi.offset+wi.tmp < wi.value {
wi.offset += 1 << 32
}
wi.value = wi.offset + wi.tmp
}
func readSysfsUint64(netIfName, filename string) (uint64, error) {
return sysfs.ReadUint64(
fmt.Sprintf(sysfsFilenameFormat, netIfName, filename))
}
func readSysfsBool(netIfName, filename string) (bool, error) {
return sysfs.ReadBool(fmt.Sprintf(sysfsFilenameFormat, netIfName, filename))
}
func readSysfsString(netIfName, filename string) (string, error) {
return sysfs.ReadString(
fmt.Sprintf(sysfsFilenameFormat, netIfName, filename))
}