Rename linux collectors for build constraints.

collector/netdev_linux.go

@@ -0,0 +1,141 @@
+// +build !nonetdev
+
+package collector
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/log"
+)
+
+const (
+	procNetDev      = "/proc/net/dev"
+	netDevSubsystem = "network"
+)
+
+var (
+	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
+}
+
+func init() {
+	Factories["netdev"] = NewNetDevCollector
+}
+
+// Takes a prometheus registry and returns a new Collector exposing
+// network device stats.
+func NewNetDevCollector() (Collector, error) {
+	return &netDevCollector{
+		ignoredDevicesPattern: regexp.MustCompile(*netdevIgnoredDevices),
+		metrics:               map[string]*prometheus.GaugeVec{},
+	}, nil
+}
+
+func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
+	netDev, err := getNetDevStats(c.ignoredDevicesPattern)
+	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 _, m := range c.metrics {
+		m.Collect(ch)
+	}
+	return err
+}
+
+func getNetDevStats(ignore *regexp.Regexp) (map[string]map[string]map[string]string, error) {
+	file, err := os.Open(procNetDev)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	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{}
+
+	scanner := bufio.NewScanner(r)
+	scanner.Scan() // skip first header
+	scanner.Scan()
+	parts := strings.Split(string(scanner.Text()), "|")
+	if len(parts) != 3 { // interface + receive + transmit
+		return nil, fmt.Errorf("Invalid header line in %s: %s",
+			procNetDev, scanner.Text())
+	}
+	header := strings.Fields(parts[1])
+	for scanner.Scan() {
+		line := strings.TrimLeft(string(scanner.Text()), " ")
+		parts := fieldSep.Split(line, -1)
+		if len(parts) != 2*len(header)+1 {
+			return nil, fmt.Errorf("Invalid line in %s: %s",
+				procNetDev, scanner.Text())
+		}
+
+		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
+	}
+	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
+}