mirror of
https://github.com/prometheus/node_exporter.git
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d290ea94b8
Instead of maintaining a counter metric for device errors in memory, this change exports a gauge and uses const metrics to avoid leaking metrics for unmounted filesystems.
98 lines
2.5 KiB
Go
98 lines
2.5 KiB
Go
// Copyright 2015 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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// +build !nofilesystem
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package collector
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import (
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"bufio"
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"os"
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"strings"
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"syscall"
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"github.com/prometheus/common/log"
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)
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const (
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defIgnoredMountPoints = "^/(sys|proc|dev)($|/)"
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defIgnoredFSTypes = "^(sys|proc|auto)fs$"
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readOnly = 0x1 // ST_RDONLY
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)
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// GetStats returns filesystem stats.
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func (c *filesystemCollector) GetStats() ([]filesystemStats, error) {
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mps, err := mountPointDetails()
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if err != nil {
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return nil, err
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}
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stats := []filesystemStats{}
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for _, labels := range mps {
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if c.ignoredMountPointsPattern.MatchString(labels.mountPoint) {
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log.Debugf("Ignoring mount point: %s", labels.mountPoint)
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continue
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}
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if c.ignoredFSTypesPattern.MatchString(labels.fsType) {
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log.Debugf("Ignoring fs type: %s", labels.fsType)
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continue
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}
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buf := new(syscall.Statfs_t)
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err := syscall.Statfs(labels.mountPoint, buf)
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if err != nil {
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stats = append(stats, filesystemStats{
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labels: labels,
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deviceError: 1,
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})
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log.Errorf("Error on statfs() system call for %q: %s", labels.mountPoint, err)
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continue
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}
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var ro float64
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if (buf.Flags & readOnly) != 0 {
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ro = 1
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}
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stats = append(stats, filesystemStats{
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labels: labels,
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size: float64(buf.Blocks) * float64(buf.Bsize),
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free: float64(buf.Bfree) * float64(buf.Bsize),
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avail: float64(buf.Bavail) * float64(buf.Bsize),
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files: float64(buf.Files),
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filesFree: float64(buf.Ffree),
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ro: ro,
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})
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}
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return stats, nil
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}
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func mountPointDetails() ([]filesystemLabels, error) {
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file, err := os.Open(procFilePath("mounts"))
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if err != nil {
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return nil, err
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}
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defer file.Close()
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filesystems := []filesystemLabels{}
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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parts := strings.Fields(scanner.Text())
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filesystems = append(filesystems, filesystemLabels{
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device: parts[0],
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mountPoint: parts[1],
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fsType: parts[2],
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})
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}
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return filesystems, scanner.Err()
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}
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