mirror of
https://github.com/kemko/nomad.git
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15fb4c990a
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
126 lines
3.2 KiB
Go
126 lines
3.2 KiB
Go
// Copyright 2019 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 procfs
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import (
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"bufio"
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"bytes"
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"regexp"
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"github.com/prometheus/procfs/internal/util"
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)
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// Regexp variables
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var (
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rPos = regexp.MustCompile(`^pos:\s+(\d+)$`)
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rFlags = regexp.MustCompile(`^flags:\s+(\d+)$`)
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rMntID = regexp.MustCompile(`^mnt_id:\s+(\d+)$`)
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rInotify = regexp.MustCompile(`^inotify`)
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)
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// ProcFDInfo contains represents file descriptor information.
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type ProcFDInfo struct {
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// File descriptor
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FD string
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// File offset
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Pos string
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// File access mode and status flags
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Flags string
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// Mount point ID
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MntID string
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// List of inotify lines (structed) in the fdinfo file (kernel 3.8+ only)
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InotifyInfos []InotifyInfo
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}
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// FDInfo constructor. On kernels older than 3.8, InotifyInfos will always be empty.
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func (p Proc) FDInfo(fd string) (*ProcFDInfo, error) {
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data, err := util.ReadFileNoStat(p.path("fdinfo", fd))
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if err != nil {
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return nil, err
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}
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var text, pos, flags, mntid string
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var inotify []InotifyInfo
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scanner := bufio.NewScanner(bytes.NewReader(data))
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for scanner.Scan() {
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text = scanner.Text()
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if rPos.MatchString(text) {
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pos = rPos.FindStringSubmatch(text)[1]
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} else if rFlags.MatchString(text) {
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flags = rFlags.FindStringSubmatch(text)[1]
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} else if rMntID.MatchString(text) {
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mntid = rMntID.FindStringSubmatch(text)[1]
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} else if rInotify.MatchString(text) {
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newInotify, err := parseInotifyInfo(text)
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if err != nil {
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return nil, err
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}
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inotify = append(inotify, *newInotify)
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}
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}
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i := &ProcFDInfo{
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FD: fd,
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Pos: pos,
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Flags: flags,
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MntID: mntid,
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InotifyInfos: inotify,
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}
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return i, nil
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}
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// InotifyInfo represents a single inotify line in the fdinfo file.
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type InotifyInfo struct {
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// Watch descriptor number
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WD string
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// Inode number
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Ino string
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// Device ID
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Sdev string
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// Mask of events being monitored
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Mask string
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}
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// InotifyInfo constructor. Only available on kernel 3.8+.
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func parseInotifyInfo(line string) (*InotifyInfo, error) {
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r := regexp.MustCompile(`^inotify\s+wd:([0-9a-f]+)\s+ino:([0-9a-f]+)\s+sdev:([0-9a-f]+)\s+mask:([0-9a-f]+)`)
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m := r.FindStringSubmatch(line)
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i := &InotifyInfo{
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WD: m[1],
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Ino: m[2],
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Sdev: m[3],
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Mask: m[4],
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}
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return i, nil
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}
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// ProcFDInfos represents a list of ProcFDInfo structs.
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type ProcFDInfos []ProcFDInfo
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func (p ProcFDInfos) Len() int { return len(p) }
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func (p ProcFDInfos) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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func (p ProcFDInfos) Less(i, j int) bool { return p[i].FD < p[j].FD }
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// InotifyWatchLen returns the total number of inotify watches
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func (p ProcFDInfos) InotifyWatchLen() (int, error) {
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length := 0
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for _, f := range p {
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length += len(f.InotifyInfos)
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}
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return length, nil
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}
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