### gopsutil
psutil是一个跨平台进程和系统监控的Python库，而gopsutil是其Go语言版本的实现。本文介绍了它的基本使用。
Go语言部署简单、性能好的特点非常适合做一些诸如采集系统信息和监控的服务，本文介绍的gopsutil库是知名Python库：psutil的一个Go语言版本的实现。
### 安装
```
go get github.com/shirou/gopsutil
```
### 使用
#### CPU
采集CPU相关信息。
```go
import "github.com/shirou/gopsutil/cpu"
// cpu info
func getCpuInfo() {
cpuInfos, err := cpu.Info()
if err != nil {
fmt.Printf("get cpu info failed, err:%v", err)
}
for _, ci := range cpuInfos {
fmt.Println(ci)
}
// CPU使用率
for {
percent, _ := cpu.Percent(time.Second, false)
fmt.Printf("cpu percent:%v\n", percent)
}
}
```
获取CPU负载信息：
```go
import "github.com/shirou/gopsutil/load"
func getCpuLoad() {
info, _ := load.Avg()
fmt.Printf("%v\n", info)
}
```
#### Memory
```go
import "github.com/shirou/gopsutil/mem"
// mem info
func getMemInfo() {
memInfo, _ := mem.VirtualMemory()
fmt.Printf("mem info:%v\n", memInfo)
}
```
#### Host
```go
import "github.com/shirou/gopsutil/host"
// host info
func getHostInfo() {
hInfo, _ := host.Info()
fmt.Printf("host info:%v uptime:%v boottime:%v\n", hInfo, hInfo.Uptime, hInfo.BootTime)
}
```
#### Disk
```go
import "github.com/shirou/gopsutil/disk"
// disk info
func getDiskInfo() {
parts, err := disk.Partitions(true)
if err != nil {
fmt.Printf("get Partitions failed, err:%v\n", err)
return
}
for _, part := range parts {
fmt.Printf("part:%v\n", part.String())
diskInfo, _ := disk.Usage(part.Mountpoint)
fmt.Printf("disk info:used:%v free:%v\n", diskInfo.UsedPercent, diskInfo.Free)
}
ioStat, _ := disk.IOCounters()
for k, v := range ioStat {
fmt.Printf("%v:%v\n", k, v)
}
}
```
#### net IO
```go
import "github.com/shirou/gopsutil/net"
func getNetInfo() {
info, _ := net.IOCounters(true)
for index, v := range info {
fmt.Printf("%v:%v send:%v recv:%v\n", index, v, v.BytesSent, v.BytesRecv)
}
}
```
#### 获取本机IP的两种方式
```go
func GetLocalIP() (ip string, err error) {
addrs, err := net.InterfaceAddrs()
if err != nil {
return
}
for _, addr := range addrs {
ipAddr, ok := addr.(*net.IPNet)
if !ok {
continue
}
if ipAddr.IP.IsLoopback() {
continue
}
if !ipAddr.IP.IsGlobalUnicast() {
continue
}
return ipAddr.IP.String(), nil
}
return
}
```
或：
```go
// Get preferred outbound ip of this machine
func GetOutboundIP() string {
conn, err := net.Dial("udp", "8.8.8.8:80")
if err != nil {
log.Fatal(err)
}
defer conn.Close()
localAddr := conn.LocalAddr().(*net.UDPAddr)
fmt.Println(localAddr.String())
return localAddr.IP.String()
}
```
