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sysfs.go
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sysfs.go
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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"
"io/ioutil"
"os"
"path"
"strings"
)
const (
blockDir = "/sys/block"
cacheDir = "/sys/devices/system/cpu/cpu"
netDir = "/sys/class/net"
)
type CacheInfo struct {
// size in bytes
Size uint64
// cache type - instruction, data, unified
Type string
// distance from cpus in a multi-level hierarchy
Level int
// number of cpus that can access this cache.
Cpus int
}
// Abstracts the lowest level calls to sysfs.
type SysFs interface {
// Get directory information for available block devices.
GetBlockDevices() ([]os.FileInfo, error)
// Get Size of a given block device.
GetBlockDeviceSize(string) (string, error)
// Get scheduler type for the block device.
GetBlockDeviceScheduler(string) (string, error)
// Get device major:minor number string.
GetBlockDeviceNumbers(string) (string, error)
GetNetworkDevices() ([]os.FileInfo, error)
GetNetworkAddress(string) (string, error)
GetNetworkMtu(string) (string, error)
GetNetworkSpeed(string) (string, error)
GetNetworkStatValue(dev string, stat string) (uint64, error)
// Get directory information for available caches accessible to given cpu.
GetCaches(id int) ([]os.FileInfo, error)
// Get information for a cache accessible from the given cpu.
GetCacheInfo(cpu int, cache string) (CacheInfo, error)
}
type realSysFs struct{}
func NewRealSysFs() (SysFs, error) {
return &realSysFs{}, nil
}
func (self *realSysFs) GetBlockDevices() ([]os.FileInfo, error) {
return ioutil.ReadDir(blockDir)
}
func (self *realSysFs) GetBlockDeviceNumbers(name string) (string, error) {
dev, err := ioutil.ReadFile(path.Join(blockDir, name, "/dev"))
if err != nil {
return "", err
}
return string(dev), nil
}
func (self *realSysFs) GetBlockDeviceScheduler(name string) (string, error) {
sched, err := ioutil.ReadFile(path.Join(blockDir, name, "/queue/scheduler"))
if err != nil {
return "", err
}
return string(sched), nil
}
func (self *realSysFs) GetBlockDeviceSize(name string) (string, error) {
size, err := ioutil.ReadFile(path.Join(blockDir, name, "/size"))
if err != nil {
return "", err
}
return string(size), nil
}
func (self *realSysFs) GetNetworkDevices() ([]os.FileInfo, error) {
return ioutil.ReadDir(netDir)
}
func (self *realSysFs) GetNetworkAddress(name string) (string, error) {
address, err := ioutil.ReadFile(path.Join(netDir, name, "/address"))
if err != nil {
return "", err
}
return string(address), nil
}
func (self *realSysFs) GetNetworkMtu(name string) (string, error) {
mtu, err := ioutil.ReadFile(path.Join(netDir, name, "/mtu"))
if err != nil {
return "", err
}
return string(mtu), nil
}
func (self *realSysFs) GetNetworkSpeed(name string) (string, error) {
speed, err := ioutil.ReadFile(path.Join(netDir, name, "/speed"))
if err != nil {
return "", err
}
return string(speed), nil
}
func (self *realSysFs) GetNetworkStatValue(dev string, stat string) (uint64, error) {
statPath := path.Join(netDir, dev, "/statistics", stat)
out, err := ioutil.ReadFile(statPath)
if err != nil {
return 0, fmt.Errorf("failed to read stat from %q for device %q", statPath, dev)
}
var s uint64
n, err := fmt.Sscanf(string(out), "%d", &s)
if err != nil || n != 1 {
return 0, fmt.Errorf("could not parse value from %q for file %s", string(out), statPath)
}
return s, nil
}
func (self *realSysFs) GetCaches(id int) ([]os.FileInfo, error) {
cpuPath := fmt.Sprintf("%s%d/cache", cacheDir, id)
return ioutil.ReadDir(cpuPath)
}
func (self *realSysFs) GetCacheInfo(id int, name string) (CacheInfo, error) {
cachePath := fmt.Sprintf("%s%d/cache/%s", cacheDir, id, name)
out, err := ioutil.ReadFile(path.Join(cachePath, "/size"))
if err != nil {
return CacheInfo{}, err
}
var size uint64
n, err := fmt.Sscanf(string(out), "%dK", &size)
if err != nil || n != 1 {
return CacheInfo{}, err
}
// convert to bytes
size = size * 1024
out, err = ioutil.ReadFile(path.Join(cachePath, "/level"))
if err != nil {
return CacheInfo{}, err
}
var level int
n, err = fmt.Sscanf(string(out), "%d", &level)
if err != nil || n != 1 {
return CacheInfo{}, err
}
out, err = ioutil.ReadFile(path.Join(cachePath, "/type"))
if err != nil {
return CacheInfo{}, err
}
cacheType := strings.TrimSpace(string(out))
out, err = ioutil.ReadFile(path.Join(cachePath, "/shared_cpu_list"))
if err != nil {
return CacheInfo{}, err
}
cpus := strings.Split(string(out), ",")
return CacheInfo{
Size: size,
Level: level,
Type: cacheType,
Cpus: len(cpus),
}, nil
}