mirror of
https://github.com/prometheus/node_exporter
synced 2024-12-30 10:02:04 +00:00
324 lines
8.4 KiB
Go
324 lines
8.4 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 !nomdadm
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package collector
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import (
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"fmt"
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"io/ioutil"
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"os"
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"regexp"
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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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var (
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statuslineRE = regexp.MustCompile(`(\d+) blocks .*\[(\d+)/(\d+)\] \[[U_]+\]`)
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raid0lineRE = regexp.MustCompile(`(\d+) blocks \d+k chunks`)
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buildlineRE = regexp.MustCompile(`\((\d+)/\d+\)`)
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)
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type mdStatus struct {
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mdName string
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isActive bool
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disksActive int64
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disksTotal int64
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blocksTotal int64
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blocksSynced int64
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}
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type mdadmCollector struct{}
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func init() {
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Factories["mdadm"] = NewMdadmCollector
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}
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func evalStatusline(statusline string) (active, total, size int64, err error) {
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matches := statuslineRE.FindStringSubmatch(statusline)
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// +1 to make it more obvious that the whole string containing the info is also returned as matches[0].
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if len(matches) < 3+1 {
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return 0, 0, 0, fmt.Errorf("too few matches found in statusline: %s", statusline)
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} else {
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if len(matches) > 3+1 {
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return 0, 0, 0, fmt.Errorf("too many matches found in statusline: %s", statusline)
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}
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}
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size, err = strconv.ParseInt(matches[1], 10, 64)
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if err != nil {
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return 0, 0, 0, fmt.Errorf("%s in statusline: %s", err, statusline)
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}
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total, err = strconv.ParseInt(matches[2], 10, 64)
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if err != nil {
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return 0, 0, 0, fmt.Errorf("%s in statusline: %s", err, statusline)
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}
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active, err = strconv.ParseInt(matches[3], 10, 64)
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if err != nil {
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return 0, 0, 0, fmt.Errorf("%s in statusline: %s", err, statusline)
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}
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return active, total, size, nil
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}
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func evalRaid0line(statusline string) (size int64, err error) {
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matches := raid0lineRE.FindStringSubmatch(statusline)
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if len(matches) != 2 {
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return 0, fmt.Errorf("invalid raid0 status line: %s", statusline)
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}
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size, err = strconv.ParseInt(matches[1], 10, 64)
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if err != nil {
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return 0, fmt.Errorf("%s in statusline: %s", err, statusline)
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}
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return size, nil
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}
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// Gets the size that has already been synced out of the sync-line.
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func evalBuildline(buildline string) (int64, error) {
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matches := buildlineRE.FindStringSubmatch(buildline)
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// +1 to make it more obvious that the whole string containing the info is also returned as matches[0].
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if len(matches) < 1+1 {
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return 0, fmt.Errorf("too few matches found in buildline: %s", buildline)
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}
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if len(matches) > 1+1 {
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return 0, fmt.Errorf("too many matches found in buildline: %s", buildline)
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}
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syncedSize, err := strconv.ParseInt(matches[1], 10, 64)
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if err != nil {
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return 0, fmt.Errorf("%s in buildline: %s", err, buildline)
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}
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return syncedSize, nil
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}
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// Parses an mdstat-file and returns a struct with the relevant infos.
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func parseMdstat(mdStatusFilePath string) ([]mdStatus, error) {
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content, err := ioutil.ReadFile(mdStatusFilePath)
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if err != nil {
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return []mdStatus{}, fmt.Errorf("error parsing mdstat: %s", err)
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}
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mdStatusFile := string(content)
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lines := strings.Split(mdStatusFile, "\n")
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var (
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currentMD string
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personality string
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active, total, size int64
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)
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// Each md has at least the deviceline, statusline and one empty line afterwards
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// so we will have probably something of the order len(lines)/3 devices
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// so we use that for preallocation.
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estimateMDs := len(lines) / 3
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mdStates := make([]mdStatus, 0, estimateMDs)
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for i, l := range lines {
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if l == "" {
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// Skip entirely empty lines.
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continue
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}
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if l[0] == ' ' || l[0] == '\t' {
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// Those lines are not the beginning of a md-section.
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continue
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}
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if strings.HasPrefix(l, "Personalities") || strings.HasPrefix(l, "unused") {
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// We aren't interested in lines with general info.
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continue
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}
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mainLine := strings.Split(l, " ")
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if len(mainLine) < 4 {
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return mdStates, fmt.Errorf("error parsing mdline: %s", l)
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}
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currentMD = mainLine[0] // The name of the md-device.
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isActive := (mainLine[2] == "active") // The activity status of the md-device.
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personality = mainLine[3] // The personality type of the md-device.
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if len(lines) <= i+3 {
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return mdStates, fmt.Errorf("error parsing mdstat: entry for %s has fewer lines than expected", currentMD)
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}
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switch personality {
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case "raid0":
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active = int64(len(mainLine) - 4) // Get the number of devices from the main line.
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total = active // Raid0 active and total is always the same if active.
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size, err = evalRaid0line(lines[i+1]) // Parse statusline, always present.
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default:
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active, total, size, err = evalStatusline(lines[i+1]) // Parse statusline, always present.
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}
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if err != nil {
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return mdStates, fmt.Errorf("error parsing mdstat: %s", err)
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}
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// Now get the number of synced blocks.
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var syncedBlocks int64
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// Get the line number of the syncing-line.
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var j int
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if strings.Contains(lines[i+2], "bitmap") { // then skip the bitmap line
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j = i + 3
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} else {
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j = i + 2
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}
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// If device is syncing at the moment, get the number of currently synced bytes,
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// otherwise that number equals the size of the device.
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if strings.Contains(lines[j], "recovery") ||
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strings.Contains(lines[j], "resync") &&
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!strings.Contains(lines[j], "\tresync=") {
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syncedBlocks, err = evalBuildline(lines[j])
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if err != nil {
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return mdStates, fmt.Errorf("error parsing mdstat: %s", err)
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}
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} else {
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syncedBlocks = size
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}
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mdStates = append(mdStates, mdStatus{currentMD, isActive, active, total, size, syncedBlocks})
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}
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return mdStates, nil
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}
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// Just returns the pointer to an empty struct as we only use throwaway-metrics.
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func NewMdadmCollector() (Collector, error) {
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return &mdadmCollector{}, nil
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}
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var (
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isActiveDesc = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "md", "is_active"),
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"Indicator whether the md-device is active or not.",
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[]string{"device"},
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nil,
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)
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disksActiveDesc = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "md", "disks_active"),
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"Number of active disks of device.",
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[]string{"device"},
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nil,
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)
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disksTotalDesc = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "md", "disks"),
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"Total number of disks of device.",
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[]string{"device"},
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nil,
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)
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blocksTotalDesc = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "md", "blocks"),
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"Total number of blocks on device.",
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[]string{"device"},
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nil,
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)
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blocksSyncedDesc = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "md", "blocks_synced"),
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"Number of blocks synced on device.",
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[]string{"device"},
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nil,
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)
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)
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func (c *mdadmCollector) Update(ch chan<- prometheus.Metric) (err error) {
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statusfile := procFilePath("mdstat")
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// take care we don't crash on non-existent statusfiles
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_, err = os.Stat(statusfile)
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if os.IsNotExist(err) {
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// no such file or directory, nothing to do, just return
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log.Debugf("Not collecting mdstat, file does not exist: %s", statusfile)
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return nil
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}
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if err != nil { // now things get weird, better to return
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return err
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}
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// First parse mdstat-file...
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mdstate, err := parseMdstat(statusfile)
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if err != nil {
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return fmt.Errorf("error parsing mdstatus: %s", err)
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}
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// ... and then plug the result into the metrics to be exported.
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var isActiveFloat float64
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for _, mds := range mdstate {
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log.Debugf("collecting metrics for device %s", mds.mdName)
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if mds.isActive {
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isActiveFloat = 1
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} else {
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isActiveFloat = 0
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}
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ch <- prometheus.MustNewConstMetric(
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isActiveDesc,
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prometheus.GaugeValue,
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isActiveFloat,
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mds.mdName,
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)
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ch <- prometheus.MustNewConstMetric(
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disksActiveDesc,
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prometheus.GaugeValue,
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float64(mds.disksActive),
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mds.mdName,
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)
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ch <- prometheus.MustNewConstMetric(
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disksTotalDesc,
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prometheus.GaugeValue,
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float64(mds.disksTotal),
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mds.mdName,
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)
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ch <- prometheus.MustNewConstMetric(
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blocksTotalDesc,
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prometheus.GaugeValue,
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float64(mds.blocksTotal),
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mds.mdName,
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)
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ch <- prometheus.MustNewConstMetric(
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blocksSyncedDesc,
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prometheus.GaugeValue,
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float64(mds.blocksSynced),
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mds.mdName,
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)
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}
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return nil
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}
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