Add meminfo collector for FreeBSD.

collector/meminfo.go

@@ -1,98 +0,0 @@
-// +build linux,!nomeminfo
-
-package collector
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"os"
-	"regexp"
-	"strconv"
-	"strings"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/log"
-)
-
-const (
-	procMemInfo      = "/proc/meminfo"
-	memInfoSubsystem = "memory"
-)
-
-type meminfoCollector struct {
-	metrics map[string]prometheus.Gauge
-}
-
-func init() {
-	Factories["meminfo"] = NewMeminfoCollector
-}
-
-// Takes a prometheus registry and returns a new Collector exposing
-// memory stats.
-func NewMeminfoCollector() (Collector, error) {
-	return &meminfoCollector{
-		metrics: map[string]prometheus.Gauge{},
-	}, nil
-}
-
-func (c *meminfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
-	memInfo, err := getMemInfo()
-	if err != nil {
-		return fmt.Errorf("Couldn't get meminfo: %s", err)
-	}
-	log.Debugf("Set node_mem: %#v", memInfo)
-	for k, v := range memInfo {
-		if _, ok := c.metrics[k]; !ok {
-			c.metrics[k] = prometheus.NewGauge(prometheus.GaugeOpts{
-				Namespace: Namespace,
-				Subsystem: memInfoSubsystem,
-				Name:      k,
-				Help:      k + " from /proc/meminfo.",
-			})
-		}
-		c.metrics[k].Set(v)
-		c.metrics[k].Collect(ch)
-	}
-	return err
-}
-
-func getMemInfo() (map[string]float64, error) {
-	file, err := os.Open(procMemInfo)
-	if err != nil {
-		return nil, err
-	}
-	defer file.Close()
-
-	return parseMemInfo(file)
-}
-
-func parseMemInfo(r io.Reader) (map[string]float64, error) {
-	var (
-		memInfo = map[string]float64{}
-		scanner = bufio.NewScanner(r)
-		re      = regexp.MustCompile("\\((.*)\\)")
-	)
-
-	for scanner.Scan() {
-		line := scanner.Text()
-		parts := strings.Fields(string(line))
-		fv, err := strconv.ParseFloat(parts[1], 64)
-		if err != nil {
-			return nil, fmt.Errorf("Invalid value in meminfo: %s", err)
-		}
-		switch len(parts) {
-		case 2: // no unit
-		case 3: // has unit, we presume kB
-			fv *= 1024
-		default:
-			return nil, fmt.Errorf("Invalid line in %s: %s", procMemInfo, line)
-		}
-		key := parts[0][:len(parts[0])-1] // remove trailing : from key
-		// Active(anon) -> Active_anon
-		key = re.ReplaceAllString(key, "_${1}")
-		memInfo[key] = fv
-	}
-
-	return memInfo, nil
-}