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ZFS Collector: Add zfetchstats functionality

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Signed-Off-By: Joe Handzik <joseph.t.handzik@hpe.com>
This commit is contained in:
Joe Handzik 2017-01-23 10:39:32 -06:00
commit a3125ab4d9
5 changed files with 112 additions and 11 deletions
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34
collector/zfs_linux.go
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@ -15,10 +15,10 @@ package collector
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"strings"
@ -27,31 +27,45 @@ import (
)
const (
zfsArcstatsProcpath = "spl/kstat/zfs/arcstats"
zfsProcpathBase = "spl/kstat/zfs/"
zfsArcstatsExt = "arcstats"
zfsFetchstatsExt = "zfetchstats"
)
func (c *zfsCollector) openArcstatsFile() (file *os.File, err error) {
file, err = os.Open(procFilePath(zfsArcstatsProcpath))
func (c *zfsCollector) openProcFile(path string) (file *os.File, err error) {
file, err = os.Open(procFilePath(path))
if err != nil {
log.Debugf("Cannot open %q for reading. Is the kernel module loaded?", procFilePath(zfsArcstatsProcpath))
log.Debugf("Cannot open %q for reading. Is the kernel module loaded?", procFilePath(path))
err = zfsNotAvailableError
}
return
}
func (c *zfsCollector) updateArcstats(ch chan<- prometheus.Metric) (err error) {
file, err := c.openArcstatsFile()
file, err := c.openProcFile(filepath.Join(zfsProcpathBase, zfsArcstatsExt))
if err != nil {
return err
}
defer file.Close()
return c.parseArcstatsProcfsFile(file, func(s zfsSysctl, v zfsMetricValue) {
return c.parseProcfsFile(file, zfsArcstatsExt, func(s zfsSysctl, v zfsMetricValue) {
ch <- c.constSysctlMetric(arc, s, v)
})
}
func (c *zfsCollector) parseArcstatsProcfsFile(reader io.Reader, handler func(zfsSysctl, zfsMetricValue)) (err error) {
func (c *zfsCollector) updateZfetchstats(ch chan<- prometheus.Metric) (err error) {
file, err := c.openProcFile(filepath.Join(zfsProcpathBase, zfsFetchstatsExt))
if err != nil {
return err
}
defer file.Close()
return c.parseProcfsFile(file, zfsFetchstatsExt, func(s zfsSysctl, v zfsMetricValue) {
ch <- c.constSysctlMetric(zfetch, s, v)
})
}
func (c *zfsCollector) parseProcfsFile(reader io.Reader, fmt_ext string, handler func(zfsSysctl, zfsMetricValue)) (err error) {
scanner := bufio.NewScanner(reader)
parseLine := false
@ -69,7 +83,7 @@ func (c *zfsCollector) parseArcstatsProcfsFile(reader io.Reader, handler func(zf
continue
}
key := fmt.Sprintf("kstat.zfs.misc.arcstats.%s", parts[0])
key := fmt.Sprintf("kstat.zfs.misc.%s.%s", fmt_ext, parts[0])
value, err := strconv.Atoi(parts[2])
if err != nil {
@ -79,7 +93,7 @@ func (c *zfsCollector) parseArcstatsProcfsFile(reader io.Reader, handler func(zf
}
if !parseLine {
return errors.New("did not parse a single arcstat metric")
return fmt.Errorf("did not parse a single %q metric", fmt_ext)
}
return scanner.Err()