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util.go
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util.go
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package util
import (
"bufio"
"errors"
"fmt"
"math/rand"
"net"
"os"
"os/exec"
"os/user"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
)
const LOGFILE = "/var/log/rexray.log"
const PIDFILE = "/var/run/rexray.pid"
const PIDDIR = "/var/run/rexray"
const LOGDIR = "/var/log/rexray"
const CLILOG = "/var/log/rexray.log"
var (
homeDir string
)
func init() {
homeDir = HomeDir()
}
func HomeDir() string {
if homeDir != "" {
return homeDir
}
hd := "$HOME"
curUser, curUserErr := user.Current()
if curUserErr == nil {
hd = curUser.HomeDir
}
return hd
}
func StringInSlice(a string, list []string) bool {
for _, b := range list {
if strings.ToLower(b) == strings.ToLower(a) {
return true
}
}
return false
}
func PidFile() string {
return PIDFILE
}
func LogFile() string {
return LOGFILE
}
func WritePidFile(pid int) error {
if pid < 0 {
pid = os.Getpid()
}
f, err := os.OpenFile(PidFile(), os.O_CREATE|os.O_WRONLY, 0644)
defer f.Close()
if err != nil {
return err
}
f.WriteString(fmt.Sprintf("%d", pid))
return nil
}
func ReadPidFile() (int, error) {
f, err := os.Open(PidFile())
if err != nil {
return -1, err
}
defer f.Close()
scanner := bufio.NewScanner(f)
if !scanner.Scan() {
return -1, errors.New("Error reading PID file")
}
pid, atoiErr := strconv.Atoi(scanner.Text())
if atoiErr != nil {
return -1, atoiErr
}
return pid, nil
}
func LineReader(filePath string) <-chan string {
if !FileExists(filePath) {
return nil
}
c := make(chan string)
go func() {
f, err := os.Open(filePath)
if err != nil {
panic(err)
}
defer f.Close()
s := bufio.NewScanner(f)
for s.Scan() {
c <- s.Text()
}
close(c)
}()
return c
}
func FileExists(filePath string) bool {
if _, err := os.Stat(filePath); !os.IsNotExist(err) {
return true
}
return false
}
func FileExistsInPath(fileName string) bool {
_, err := exec.LookPath(fileName)
return err == nil
}
func GetPathParts(path string) (dirPath, fileName, absPath string) {
absPath, _ = filepath.Abs(path)
dirPath = filepath.Dir(absPath)
fileName = filepath.Base(absPath)
return
}
func GetThisPathParts() (dirPath, fileName, absPath string) {
return GetPathParts(os.Args[0])
}
const (
LETTER_BYTES = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
LETTER_INDEX_BITS = 6
LETTER_INDEX_MASK = 1<<LETTER_INDEX_BITS - 1
LETTER_INDEX_MAX = 63 / LETTER_INDEX_BITS
)
func RandomString(length int) string {
src := rand.NewSource(time.Now().UnixNano())
b := make([]byte, length)
for i, cache, remain := length-1, src.Int63(), LETTER_INDEX_MAX; i >= 0; {
if remain == 0 {
cache, remain = src.Int63(), LETTER_INDEX_MAX
}
if idx := int(cache & LETTER_INDEX_MASK); idx < len(LETTER_BYTES) {
b[i] = LETTER_BYTES[idx]
i--
}
cache >>= LETTER_INDEX_BITS
remain--
}
return string(b)
}
// GetLocalIP returns the non loopback local IP of the host
func GetLocalIP() string {
addrs, err := net.InterfaceAddrs()
if err != nil {
return ""
}
for _, address := range addrs {
// check the address type and if it is not a loopback the display it
if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
return ipnet.IP.String()
}
}
}
return ""
}
const ADDR_PATT = "(?i)^((?:(?:tcp|udp|ip)[46]?)|(?:unix(?:gram|packet)?))://(.+)$"
func ParseAddress(addr string) (proto string, path string, err error) {
rx, rxErr := regexp.Compile(ADDR_PATT)
if rxErr != nil {
return "", "", nil
}
if !rx.MatchString(addr) {
return "", "", errors.New(fmt.Sprintf("Invalid address '%s'", addr))
}
m := rx.FindStringSubmatch(addr)
return m[1], m[2], nil
}