mirror of https://github.com/prometheus/prometheus
Fabian Reinartz
9 years ago
parent
7700cff1ff
commit
7d441abd7b
@ -0,0 +1,29 @@
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package prometheus
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// Inline and byte-free variant of hash/fnv's fnv64a.
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const (
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offset64 = 14695981039346656037
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prime64 = 1099511628211
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)
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// hashNew initializies a new fnv64a hash value.
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func hashNew() uint64 {
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return offset64
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}
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// hashAdd adds a string to a fnv64a hash value, returning the updated hash.
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func hashAdd(h uint64, s string) uint64 {
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for i := 0; i < len(s); i++ {
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h ^= uint64(s[i])
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h *= prime64
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}
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return h
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}
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// hashAddByte adds a byte to a fnv64a hash value, returning the updated hash.
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func hashAddByte(h uint64, b byte) uint64 {
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h ^= uint64(b)
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h *= prime64
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return h
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}
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@ -0,0 +1,6 @@
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ci:
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! gofmt -l *.go | read nothing
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go vet
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go test -v ./...
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go get github.com/golang/lint/golint
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golint *.go
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@ -0,0 +1,138 @@
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package procfs
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import (
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"fmt"
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"io/ioutil"
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"regexp"
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"strconv"
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"strings"
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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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buildlineRE = regexp.MustCompile(`\((\d+)/\d+\)`)
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)
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// MDStat holds info parsed from /proc/mdstat.
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type MDStat struct {
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// Name of the device.
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Name string
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// activity-state of the device.
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ActivityState string
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// Number of active disks.
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DisksActive int64
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// Total number of disks the device consists of.
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DisksTotal int64
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// Number of blocks the device holds.
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BlocksTotal int64
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// Number of blocks on the device that are in sync.
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BlocksSynced int64
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}
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// ParseMDStat parses an mdstat-file and returns a struct with the relevant infos.
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func (fs FS) ParseMDStat() (mdstates []MDStat, err error) {
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mdStatusFilePath := fs.Path("mdstat")
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content, err := ioutil.ReadFile(mdStatusFilePath)
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if err != nil {
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return []MDStat{}, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
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}
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mdStates := []MDStat{}
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lines := strings.Split(string(content), "\n")
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for i, l := range lines {
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if l == "" {
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continue
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}
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if l[0] == ' ' {
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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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continue
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}
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mainLine := strings.Split(l, " ")
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if len(mainLine) < 3 {
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return mdStates, fmt.Errorf("error parsing mdline: %s", l)
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}
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mdName := mainLine[0]
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activityState := mainLine[2]
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if len(lines) <= i+3 {
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return mdStates, fmt.Errorf(
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"error parsing %s: too few lines for md device %s",
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mdStatusFilePath,
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mdName,
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)
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}
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active, total, size, err := evalStatusline(lines[i+1])
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if err != nil {
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return mdStates, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
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}
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// j is the line number of the syncing-line.
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j := i + 2
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if strings.Contains(lines[i+2], "bitmap") { // skip bitmap line
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j = i + 3
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}
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// If device is syncing at the moment, get the number of currently
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// synced bytes, otherwise that number equals the size of the device.
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syncedBlocks := size
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if strings.Contains(lines[j], "recovery") || strings.Contains(lines[j], "resync") {
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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 %s: %s", mdStatusFilePath, err)
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}
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}
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mdStates = append(mdStates, MDStat{
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Name: mdName,
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ActivityState: activityState,
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DisksActive: active,
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DisksTotal: total,
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BlocksTotal: size,
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BlocksSynced: syncedBlocks,
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})
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}
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return mdStates, nil
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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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if len(matches) != 4 {
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return 0, 0, 0, fmt.Errorf("unexpected statusline: %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, 0, 0, fmt.Errorf("unexpected statusline %s: %s", statusline, err)
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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("unexpected statusline %s: %s", statusline, err)
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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("unexpected statusline %s: %s", statusline, err)
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}
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return active, total, size, nil
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}
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func evalBuildline(buildline string) (syncedBlocks int64, err error) {
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matches := buildlineRE.FindStringSubmatch(buildline)
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if len(matches) != 2 {
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return 0, fmt.Errorf("unexpected buildline: %s", buildline)
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}
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syncedBlocks, 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 syncedBlocks, nil
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}
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