mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-23 20:36:21 +01:00
105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
// Copyright 2016 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collector
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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)
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const (
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zfsProcpathBase = "spl/kstat/zfs/"
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zfsArcstatsExt = "arcstats"
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zfsFetchstatsExt = "zfetchstats"
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)
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func (c *zfsCollector) openProcFile(path string) (file *os.File, err error) {
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file, err = os.Open(procFilePath(path))
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if err != nil {
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log.Debugf("Cannot open %q for reading. Is the kernel module loaded?", procFilePath(path))
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err = zfsNotAvailableError
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}
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return
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}
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func (c *zfsCollector) updateArcstats(ch chan<- prometheus.Metric) (err error) {
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file, err := c.openProcFile(filepath.Join(zfsProcpathBase, zfsArcstatsExt))
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if err != nil {
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return err
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}
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defer file.Close()
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return c.parseProcfsFile(file, zfsArcstatsExt, func(s zfsSysctl, v zfsMetricValue) {
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ch <- c.constSysctlMetric(arc, s, v)
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})
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}
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func (c *zfsCollector) updateZfetchstats(ch chan<- prometheus.Metric) (err error) {
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file, err := c.openProcFile(filepath.Join(zfsProcpathBase, zfsFetchstatsExt))
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if err != nil {
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return err
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}
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defer file.Close()
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return c.parseProcfsFile(file, zfsFetchstatsExt, func(s zfsSysctl, v zfsMetricValue) {
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ch <- c.constSysctlMetric(zfetch, s, v)
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})
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}
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func (c *zfsCollector) parseProcfsFile(reader io.Reader, fmt_ext string, handler func(zfsSysctl, zfsMetricValue)) (err error) {
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scanner := bufio.NewScanner(reader)
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parseLine := false
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for scanner.Scan() {
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parts := strings.Fields(scanner.Text())
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if !parseLine && len(parts) == 3 && parts[0] == "name" && parts[1] == "type" && parts[2] == "data" {
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// Start parsing from here.
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parseLine = true
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continue
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}
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if !parseLine || len(parts) < 3 {
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continue
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}
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key := fmt.Sprintf("kstat.zfs.misc.%s.%s", fmt_ext, parts[0])
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value, err := strconv.Atoi(parts[2])
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if err != nil {
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return fmt.Errorf("could not parse expected integer value for %q", key)
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}
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handler(zfsSysctl(key), zfsMetricValue(value))
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}
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if !parseLine {
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return fmt.Errorf("did not parse a single %q metric", fmt_ext)
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}
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return scanner.Err()
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}
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func (c *zfsCollector) updatePoolStats(ch chan<- prometheus.Metric) (err error) {
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return nil
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}
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