Add go-sysinfo cmd

[eozer]

Hi,

As a new user of this package, I had to spend a little more time to understand what kind of information go-sysinfo was able to provide, say compared to other packages, e.g., https://github.com/zcalusic/sysinfo.

A simple utility command line program would help new users to check quickly all the available information. For example, something like below.

package main

import (
	"encoding/json"
	"fmt"
	"log"

	"github.com/elastic/go-sysinfo"
	"github.com/elastic/go-sysinfo/types"
)

type SysInfo struct {
	ProcessInfo    types.ProcessInfo     `json:"process_info"`
	CPUTimes       types.CPUTimes        `json:"cpu_times"`
	MemoryInfo     types.MemoryInfo      `json:"memory_info"`
	UserInfo       types.UserInfo        `json:"user_info"`
	HostInfo       types.HostInfo        `json:"host_info"`
	HostMemoryInfo *types.HostMemoryInfo `json:"host_memory_info"`
}

func GetSysInfo() SysInfo {
	process, _ := sysinfo.Self()
	processInfo, _ := process.Info()
	cpuTime, _ := process.CPUTime()
	memoryInfo, _ := process.Memory()
	userInfo, _ := process.User()

	host, _ := sysinfo.Host()
	hostInfo := host.Info()
	hostMemoryInfo, _ := host.Memory()

	return SysInfo{
		ProcessInfo:    processInfo,
		CPUTimes:       cpuTime,
		MemoryInfo:     memoryInfo,
		UserInfo:       userInfo,
		HostInfo:       hostInfo,
		HostMemoryInfo: hostMemoryInfo,
	}
}

func main() {
	sysinf := GetSysInfo()

	data, err := json.MarshalIndent(&sysinf, "", "  ")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(string(data))
}

Output:

{
  "process_info": {
    "name": "sysinfo",
    "pid": 10142,
    "ppid": 25771,
    "cwd": "/workspace/go-sysinfo/cmd/sysinfo",
    "exe": "/workspace/go-sysinfo/cmd/sysinfo/sysinfo",
    "args": [
      "./sysinfo"
    ],
    "start_time": "2021-10-24T16:23:14.47Z"
  },
  "cpu_times": {
    "user": 0,
    "system": 0
  },
  "memory_info": {
    "resident_bytes": 5734400,
    "virtual_bytes": 720535552
  },
  "user_info": {
    "uid": "0",
    "euid": "0",
    "suid": "0",
    "gid": "0",
    "egid": "0",
    "sgid": "0"
  },
  "host_info": {
    "architecture": "x86_64",
    "boot_time": "2021-10-24T10:28:56Z",
    "containerized": true,
    "name": "58755aabff76",
    "ip": [
      "127.0.0.1/8",
      "172.18.0.2/16"
    ],
    "kernel_version": "5.4.72-microsoft-standard-WSL2",
    "mac": [
      "02:42:ac:12:00:02"
    ],
    "os": {
      "type": "linux",
      "family": "",
      "platform": "alpine",
      "name": "Alpine Linux",
      "version": "",
      "major": 0,
      "minor": 0,
      "patch": 0
    },
    "timezone": "UTC",
    "timezone_offset_sec": 0,
    "id": "8203ec2a7d4a85be1975970061753e5c"
  },
  "host_memory_info": {
    "total_bytes": 13293199360,
    "used_bytes": 4198158336,
    "available_bytes": 11434057728,
    "free_bytes": 9095041024,
    "virtual_total_bytes": 4294967296,
    "virtual_used_bytes": 0,
    "virtual_free_bytes": 4294967296,
    "raw": {
      "Active": 1741504512,
      "Active(anon)": 1001545728,
      "Active(file)": 739958784,
      "AnonHugePages": 262144000,
      "AnonPages": 878346240,
      "Bounce": 0,
      "Buffers": 310341632,
      "Cached": 2418610176,
      "CommitLimit": 10941566976,
      "Committed_AS": 4803932160,
      "DirectMap1G": 7516192768,
      "DirectMap2M": 6067060736,
      "DirectMap4k": 47185920,
      "Dirty": 0,
      "FileHugePages": 0,
      "FilePmdMapped": 0,
      "HugePages_Free": 0,
      "HugePages_Rsvd": 0,
      "HugePages_Surp": 0,
      "HugePages_Total": 0,
      "Hugepagesize": 2097152,
      "Hugetlb": 0,
      "Inactive": 2007437312,
      "Inactive(anon)": 297070592,
      "Inactive(file)": 1710366720,
      "KReclaimable": 216645632,
      "KernelStack": 15048704,
      "Mapped": 273330176,
      "Mlocked": 0,
      "NFS_Unstable": 0,
      "PageTables": 9781248,
      "Percpu": 6750208,
      "SReclaimable": 216645632,
      "SUnreclaim": 104050688,
      "Shmem": 386269184,
      "ShmemHugePages": 0,
      "ShmemPmdMapped": 0,
      "Slab": 320696320,
      "SwapCached": 0,
      "Unevictable": 0,
      "VmallocChunk": 0,
      "VmallocTotal": 35184372087808,
      "VmallocUsed": 35704832,
      "Writeback": 0,
      "WritebackTmp": 0
    }
  }
}

[andrewkroh]

Running go test -v . outputs all the data collected as JSON. But I like the idea of an example command.