mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-22 16:36:07 +01:00
109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
// Copyright 2017 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package sysfs
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"path/filepath"
|
|
|
|
"github.com/prometheus/procfs/bcache"
|
|
"github.com/prometheus/procfs/xfs"
|
|
)
|
|
|
|
// FS represents the pseudo-filesystem sys, which provides an interface to
|
|
// kernel data structures.
|
|
type FS string
|
|
|
|
// DefaultMountPoint is the common mount point of the sys filesystem.
|
|
const DefaultMountPoint = "/sys"
|
|
|
|
// NewFS returns a new FS mounted under the given mountPoint. It will error
|
|
// if the mount point can't be read.
|
|
func NewFS(mountPoint string) (FS, error) {
|
|
info, err := os.Stat(mountPoint)
|
|
if err != nil {
|
|
return "", fmt.Errorf("could not read %s: %s", mountPoint, err)
|
|
}
|
|
if !info.IsDir() {
|
|
return "", fmt.Errorf("mount point %s is not a directory", mountPoint)
|
|
}
|
|
|
|
return FS(mountPoint), nil
|
|
}
|
|
|
|
// Path returns the path of the given subsystem relative to the sys root.
|
|
func (fs FS) Path(p ...string) string {
|
|
return filepath.Join(append([]string{string(fs)}, p...)...)
|
|
}
|
|
|
|
// XFSStats retrieves XFS filesystem runtime statistics for each mounted XFS
|
|
// filesystem. Only available on kernel 4.4+. On older kernels, an empty
|
|
// slice of *xfs.Stats will be returned.
|
|
func (fs FS) XFSStats() ([]*xfs.Stats, error) {
|
|
matches, err := filepath.Glob(fs.Path("fs/xfs/*/stats/stats"))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
stats := make([]*xfs.Stats, 0, len(matches))
|
|
for _, m := range matches {
|
|
f, err := os.Open(m)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// "*" used in glob above indicates the name of the filesystem.
|
|
name := filepath.Base(filepath.Dir(filepath.Dir(m)))
|
|
|
|
// File must be closed after parsing, regardless of success or
|
|
// failure. Defer is not used because of the loop.
|
|
s, err := xfs.ParseStats(f)
|
|
_ = f.Close()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
s.Name = name
|
|
stats = append(stats, s)
|
|
}
|
|
|
|
return stats, nil
|
|
}
|
|
|
|
// BcacheStats retrieves bcache runtime statistics for each bcache.
|
|
func (fs FS) BcacheStats() ([]*bcache.Stats, error) {
|
|
matches, err := filepath.Glob(fs.Path("fs/bcache/*-*"))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
stats := make([]*bcache.Stats, 0, len(matches))
|
|
for _, uuidPath := range matches {
|
|
// "*-*" in glob above indicates the name of the bcache.
|
|
name := filepath.Base(uuidPath)
|
|
|
|
// stats
|
|
s, err := bcache.GetStats(uuidPath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
s.Name = name
|
|
stats = append(stats, s)
|
|
}
|
|
|
|
return stats, nil
|
|
}
|