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Revamp the netdev collector to use throw-away ConstMetrics.

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This commit is contained in:
Martín Ferrari 2015-09-15 15:31:51 +00:00
parent e180b882d6
commit 13672ced48
3 changed files with 85 additions and 108 deletions
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84
collector/netdev_freebsd.go
View file

@ -21,11 +21,11 @@ import (
import "C"
const (
netDevSubsystem = "network"
subsystem = "network"
)
type netDevCollector struct {
metrics map[string]*prometheus.CounterVec
metricDescs map[string]*prometheus.Desc
}
func init() {
@ -36,7 +36,7 @@ func init() {
// Network device stats.
func NewNetDevCollector() (Collector, error) {
return &netDevCollector{
metrics: map[string]*prometheus.CounterVec{},
metricDescs: map[string]*prometheus.Desc{},
}, nil
}
@ -45,39 +45,35 @@ func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
if err != nil {
return fmt.Errorf("couldn't get netstats: %s", err)
}
for direction, devStats := range netDev {
for dev, stats := range devStats {
for t, value := range stats {
key := direction + "_" + t
if _, ok := c.metrics[key]; !ok {
c.metrics[key] = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: Namespace,
Subsystem: netDevSubsystem,
Name: key,
Help: fmt.Sprintf("%s %s from getifaddrs().", t, direction),
},
[]string{"device"},
)
}
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return fmt.Errorf("invalid value %s in netstats: %s", value, err)
}
c.metrics[key].WithLabelValues(dev).Set(v)
for dev, devStats := range netDev {
for key, value := range devStats {
desc, ok := c.metricDescs[key]
if !ok {
desc = prometheus.NewDesc(
prometheus.BuildFQName(
Namespace, subsystem, key),
fmt.Sprintf(
"%s from getifaddrs().", key),
[]string{"device"},
nil,
)
c.metricDescs[key] = desc
}
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return fmt.Errorf(
"Invalid value %s in netstats: %s",
value, err)
}
ch <- prometheus.MustNewConstMetric(
desc, prometheus.GaugeValue, v, dev)
}
}
for _, m := range c.metrics {
m.Collect(ch)
}
return err
return nil
}
func getNetDevStats() (map[string]map[string]map[string]string, error) {
netDev := map[string]map[string]map[string]string{}
netDev["transmit"] = map[string]map[string]string{}
netDev["receive"] = map[string]map[string]string{}
func getNetDevStats() (map[string]map[string]string, error) {
netDev := map[string]map[string]string{}
var ifap, ifa *C.struct_ifaddrs
if C.getifaddrs(&ifap) == -1 {
@ -87,22 +83,20 @@ func getNetDevStats() (map[string]map[string]map[string]string, error) {
for ifa = ifap; ifa != nil; ifa = ifa.ifa_next {
if ifa.ifa_addr.sa_family == C.AF_LINK {
receive := map[string]string{}
transmit := map[string]string{}
devStats := map[string]string{}
data := (*C.struct_if_data)(ifa.ifa_data)
receive["packets"] = strconv.Itoa(int(data.ifi_ipackets))
transmit["packets"] = strconv.Itoa(int(data.ifi_opackets))
receive["errs"] = strconv.Itoa(int(data.ifi_ierrors))
transmit["errs"] = strconv.Itoa(int(data.ifi_oerrors))
receive["bytes"] = strconv.Itoa(int(data.ifi_ibytes))
transmit["bytes"] = strconv.Itoa(int(data.ifi_obytes))
receive["multicast"] = strconv.Itoa(int(data.ifi_imcasts))
transmit["multicast"] = strconv.Itoa(int(data.ifi_omcasts))
receive["drop"] = strconv.Itoa(int(data.ifi_iqdrops))
transmit["drop"] = strconv.Itoa(int(data.ifi_oqdrops))
netDev["receive"][C.GoString(ifa.ifa_name)] = receive
netDev["transmit"][C.GoString(ifa.ifa_name)] = transmit
devStats["receive_packets"] = strconv.Itoa(int(data.ifi_ipackets))
devStats["transmit_packets"] = strconv.Itoa(int(data.ifi_opackets))
devStats["receive_errs"] = strconv.Itoa(int(data.ifi_ierrors))
devStats["transmit_errs"] = strconv.Itoa(int(data.ifi_oerrors))
devStats["receive_bytes"] = strconv.Itoa(int(data.ifi_ibytes))
devStats["transmit_bytes"] = strconv.Itoa(int(data.ifi_obytes))
devStats["receive_multicast"] = strconv.Itoa(int(data.ifi_imcasts))
devStats["transmit_multicast"] = strconv.Itoa(int(data.ifi_omcasts))
devStats["receive_drop"] = strconv.Itoa(int(data.ifi_iqdrops))
devStats["transmit_drop"] = strconv.Itoa(int(data.ifi_oqdrops))
netDev[C.GoString(ifa.ifa_name)] = devStats
}
}

99
collector/netdev_linux.go
View file

@ -17,19 +17,20 @@ import (
)
const (
procNetDev = "/proc/net/dev"
netDevSubsystem = "network"
procNetDev = "/proc/net/dev"
subsystem = "network"
)
var (
fieldSep = regexp.MustCompile("[ :] *")
netdevIgnoredDevices = flag.String("collector.netdev.ignored-devices", "^$", "Regexp of net devices to ignore for netdev collector.")
fieldSep = regexp.MustCompile("[ :] *")
netdevIgnoredDevices = flag.String(
"collector.netdev.ignored-devices", "^$",
"Regexp of net devices to ignore for netdev collector.")
)
type netDevCollector struct {
ignoredDevicesPattern *regexp.Regexp
metrics map[string]*prometheus.GaugeVec
metricDescs map[string]*prometheus.Desc
}
func init() {
@ -39,9 +40,10 @@ func init() {
// Takes a prometheus registry and returns a new Collector exposing
// network device stats.
func NewNetDevCollector() (Collector, error) {
pattern := regexp.MustCompile(*netdevIgnoredDevices)
return &netDevCollector{
ignoredDevicesPattern: regexp.MustCompile(*netdevIgnoredDevices),
metrics: map[string]*prometheus.GaugeVec{},
ignoredDevicesPattern: pattern,
metricDescs: map[string]*prometheus.Desc{},
}, nil
}
@ -50,36 +52,34 @@ func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
if err != nil {
return fmt.Errorf("Couldn't get netstats: %s", err)
}
for direction, devStats := range netDev {
for dev, stats := range devStats {
for t, value := range stats {
key := direction + "_" + t
if _, ok := c.metrics[key]; !ok {
c.metrics[key] = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Subsystem: netDevSubsystem,
Name: key,
Help: fmt.Sprintf("%s %s from /proc/net/dev.", t, direction),
},
[]string{"device"},
)
}
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return fmt.Errorf("Invalid value %s in netstats: %s", value, err)
}
c.metrics[key].WithLabelValues(dev).Set(v)
for dev, devStats := range netDev {
for key, value := range devStats {
desc, ok := c.metricDescs[key]
if !ok {
desc = prometheus.NewDesc(
prometheus.BuildFQName(
Namespace, subsystem, key),
fmt.Sprintf(
"%s from /proc/net/dev.", key),
[]string{"device"},
nil,
)
c.metricDescs[key] = desc
}
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return fmt.Errorf(
"Invalid value %s in netstats: %s",
value, err)
}
ch <- prometheus.MustNewConstMetric(
desc, prometheus.GaugeValue, v, dev)
}
}
for _, m := range c.metrics {
m.Collect(ch)
}
return err
return nil
}
func getNetDevStats(ignore *regexp.Regexp) (map[string]map[string]map[string]string, error) {
func getNetDevStats(ignore *regexp.Regexp) (map[string]map[string]string, error) {
file, err := os.Open(procNetDev)
if err != nil {
return nil, err
@ -89,11 +89,7 @@ func getNetDevStats(ignore *regexp.Regexp) (map[string]map[string]map[string]str
return parseNetDevStats(file, ignore)
}
func parseNetDevStats(r io.Reader, ignore *regexp.Regexp) (map[string]map[string]map[string]string, error) {
netDev := map[string]map[string]map[string]string{}
netDev["transmit"] = map[string]map[string]string{}
netDev["receive"] = map[string]map[string]string{}
func parseNetDevStats(r io.Reader, ignore *regexp.Regexp) (map[string]map[string]string, error) {
scanner := bufio.NewScanner(r)
scanner.Scan() // skip first header
scanner.Scan()
@ -102,7 +98,9 @@ func parseNetDevStats(r io.Reader, ignore *regexp.Regexp) (map[string]map[string
return nil, fmt.Errorf("Invalid header line in %s: %s",
procNetDev, scanner.Text())
}
header := strings.Fields(parts[1])
netDev := map[string]map[string]string{}
for scanner.Scan() {
line := strings.TrimLeft(string(scanner.Text()), " ")
parts := fieldSep.Split(line, -1)
@ -112,30 +110,15 @@ func parseNetDevStats(r io.Reader, ignore *regexp.Regexp) (map[string]map[string
}
dev := parts[0][:len(parts[0])]
receive, err := parseNetDevLine(parts[1:len(header)+1], header)
if err != nil {
return nil, err
}
transmit, err := parseNetDevLine(parts[len(header)+1:], header)
if err != nil {
return nil, err
}
if ignore.MatchString(dev) {
log.Debugf("Ignoring device: %s", dev)
continue
}
netDev["transmit"][dev] = transmit
netDev["receive"][dev] = receive
netDev[dev] = map[string]string{}
for i, v := range header {
netDev[dev]["receive_" + v] = parts[i+1]
netDev[dev]["transmit_" + v] = parts[i+1+len(header)]
}
}
return netDev, nil
}
func parseNetDevLine(parts []string, header []string) (map[string]string, error) {
devStats := map[string]string{}
for i, v := range parts {
devStats[header[i]] = v
}
return devStats, nil
}

10
collector/netdev_linux_test.go
View file

@ -18,23 +18,23 @@ func TestNetDevStats(t *testing.T) {
t.Fatal(err)
}
if want, got := "10437182923", netStats["receive"]["wlan0"]["bytes"]; want != got {
if want, got := "10437182923", netStats["wlan0"]["receive_bytes"]; want != got {
t.Errorf("want netstat wlan0 bytes %s, got %s", want, got)
}
if want, got := "68210035552", netStats["receive"]["eth0"]["bytes"]; want != got {
if want, got := "68210035552", netStats["eth0"]["receive_bytes"]; want != got {
t.Errorf("want netstat eth0 bytes %s, got %s", want, got)
}
if want, got := "934", netStats["transmit"]["tun0"]["packets"]; want != got {
if want, got := "934", netStats["tun0"]["transmit_packets"]; want != got {
t.Errorf("want netstat tun0 packets %s, got %s", want, got)
}
if want, got := 6, len(netStats["transmit"]); want != got {
if want, got := 6, len(netStats); want != got {
t.Errorf("want count of devices to be %d, got %d", want, got)
}
if _, ok := netStats["transmit"]["veth4B09XN"]; ok != false {
if _, ok := netStats["veth4B09XN"]["transmit_bytes"]; ok != false {
t.Error("want fixture interface veth4B09XN to not exist, but it does")
}
}