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util.go
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util.go
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package util
import (
"fmt"
"io"
"os"
"os/exec"
"regexp"
"strconv"
"time"
"github.com/akutz/gofig"
"github.com/akutz/gotil"
apiversion "github.com/emccode/libstorage/api"
"github.com/emccode/libstorage/api/context"
apiserver "github.com/emccode/libstorage/api/server"
apitypes "github.com/emccode/libstorage/api/types"
"github.com/emccode/rexray/core"
)
const (
logDirPathSuffix = "/var/log/rexray"
etcDirPathSuffix = "/etc/rexray"
binDirPathSuffix = "/usr/bin"
runDirPathSuffix = "/var/run/rexray"
libDirPathSuffix = "/var/lib/rexray"
// UnitFilePath is the path to the SystemD service's unit file.
UnitFilePath = "/etc/systemd/system/rexray.service"
// InitFilePath is the path to the SystemV Service's init script.
InitFilePath = "/etc/init.d/rexray"
// EnvFileName is the name of the environment file used by the SystemD
// service.
EnvFileName = "rexray.env"
)
var (
thisExeDir string
thisExeName string
thisExeAbsPath string
prefix string
binDirPath string
binFilePath string
logDirPath string
libDirPath string
runDirPath string
etcDirPath string
pidFilePath string
)
func init() {
prefix = os.Getenv("REXRAY_HOME")
thisExeDir, thisExeName, thisExeAbsPath = gotil.GetThisPathParts()
}
// GetPrefix gets the root path to the REX-Ray data.
func GetPrefix() string {
return prefix
}
// Prefix sets the root path to the REX-Ray data.
func Prefix(p string) {
if p == "" || p == "/" {
return
}
binDirPath = ""
binFilePath = ""
logDirPath = ""
libDirPath = ""
runDirPath = ""
etcDirPath = ""
pidFilePath = ""
prefix = p
}
// IsPrefixed returns a flag indicating whether or not a prefix value is set.
func IsPrefixed() bool {
return !(prefix == "" || prefix == "/")
}
// Install executes the system install command.
func Install(args ...string) {
exec.Command("install", args...).Run()
}
// InstallChownRoot executes the system install command and chowns the target
// to the root user and group.
func InstallChownRoot(args ...string) {
a := []string{"-o", "0", "-g", "0"}
for _, i := range args {
a = append(a, i)
}
exec.Command("install", a...).Run()
}
// InstallDirChownRoot executes the system install command with a -d flag and
// chowns the target to the root user and group.
func InstallDirChownRoot(dirPath string) {
InstallChownRoot("-d", dirPath)
}
// EtcDirPath returns the path to the REX-Ray etc directory.
func EtcDirPath() string {
if etcDirPath == "" {
etcDirPath = fmt.Sprintf("%s%s", prefix, etcDirPathSuffix)
os.MkdirAll(etcDirPath, 0755)
}
return etcDirPath
}
// RunDirPath returns the path to the REX-Ray run directory.
func RunDirPath() string {
if runDirPath == "" {
runDirPath = fmt.Sprintf("%s%s", prefix, runDirPathSuffix)
os.MkdirAll(runDirPath, 0755)
}
return runDirPath
}
// LogDirPath returns the path to the REX-Ray log directory.
func LogDirPath() string {
if logDirPath == "" {
logDirPath = fmt.Sprintf("%s%s", prefix, logDirPathSuffix)
os.MkdirAll(logDirPath, 0755)
}
return logDirPath
}
// LibDirPath returns the path to the REX-Ray bin directory.
func LibDirPath() string {
if libDirPath == "" {
libDirPath = fmt.Sprintf("%s%s", prefix, libDirPathSuffix)
os.MkdirAll(libDirPath, 0755)
}
return libDirPath
}
// LibFilePath returns the path to a file inside the REX-Ray lib directory
// with the provided file name.
func LibFilePath(fileName string) string {
return fmt.Sprintf("%s/%s", LibDirPath(), fileName)
}
// RunFilePath returns the path to a file inside the REX-Ray run directory
// with the provided file name.
func RunFilePath(fileName string) string {
return fmt.Sprintf("%s/%s", RunDirPath(), fileName)
}
// BinDirPath returns the path to the REX-Ray bin directory.
func BinDirPath() string {
if binDirPath == "" {
binDirPath = fmt.Sprintf("%s%s", prefix, binDirPathSuffix)
os.MkdirAll(binDirPath, 0755)
}
return binDirPath
}
// PidFilePath returns the path to the REX-Ray PID file.
func PidFilePath() string {
if pidFilePath == "" {
pidFilePath = fmt.Sprintf("%s/rexray.pid", RunDirPath())
}
return pidFilePath
}
// BinFilePath returns the path to the REX-Ray executable.
func BinFilePath() string {
if binFilePath == "" {
binFilePath = fmt.Sprintf("%s/rexray", BinDirPath())
}
return binFilePath
}
// EtcFilePath returns the path to a file inside the REX-Ray etc directory
// with the provided file name.
func EtcFilePath(fileName string) string {
return fmt.Sprintf("%s/%s", EtcDirPath(), fileName)
}
// LogFilePath returns the path to a file inside the REX-Ray log directory
// with the provided file name.
func LogFilePath(fileName string) string {
return fmt.Sprintf("%s/%s", LogDirPath(), fileName)
}
// LogFile returns a writer to a file inside the REX-Ray log directory
// with the provided file name.
func LogFile(fileName string) (io.Writer, error) {
return os.OpenFile(
LogFilePath(fileName), os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644)
}
// StdOutAndLogFile returns a mutltiplexed writer for the current process's
// stdout descriptor and a REX-Ray log file with the provided name.
func StdOutAndLogFile(fileName string) (io.Writer, error) {
lf, lfErr := LogFile(fileName)
if lfErr != nil {
return nil, lfErr
}
return io.MultiWriter(os.Stdout, lf), nil
}
// WritePidFile writes the current process ID to the REX-Ray PID file.
func WritePidFile(pid int) error {
if pid < 0 {
pid = os.Getpid()
}
return gotil.WriteStringToFile(fmt.Sprintf("%d", pid), PidFilePath())
}
// ReadPidFile reads the REX-Ray PID from the PID file.
func ReadPidFile() (int, error) {
pidStr, pidStrErr := gotil.ReadFileToString(PidFilePath())
if pidStrErr != nil {
return -1, pidStrErr
}
pid, atoiErr := strconv.Atoi(pidStr)
if atoiErr != nil {
return -1, atoiErr
}
return pid, nil
}
// PrintVersion prints the current version information to the provided writer.
func PrintVersion(out io.Writer) {
fmt.Fprintln(out, "REX-Ray")
fmt.Fprintln(out, "-------")
fmt.Fprintf(out, "Binary: %s\n", thisExeAbsPath)
fmt.Fprintf(out, "SemVer: %s\n", core.Version.SemVer)
fmt.Fprintf(out, "OsArch: %s\n", core.Version.Arch)
fmt.Fprintf(out, "Branch: %s\n", core.Version.Branch)
fmt.Fprintf(out, "Commit: %s\n", core.Version.ShaLong)
fmt.Fprintf(out, "Formed: %s\n\n",
core.Version.BuildTimestamp.Format(time.RFC1123))
fmt.Fprintln(out, "libStorage")
fmt.Fprintln(out, "----------")
fmt.Fprintf(out, "SemVer: %s\n", apiversion.Version.SemVer)
fmt.Fprintf(out, "OsArch: %s\n", apiversion.Version.Arch)
fmt.Fprintf(out, "Branch: %s\n", apiversion.Version.Branch)
fmt.Fprintf(out, "Commit: %s\n", apiversion.Version.ShaLong)
timestamp := apiversion.Version.BuildTimestamp.Format(time.RFC1123)
fmt.Fprintf(out, "Formed: %s\n", timestamp)
}
// WaitUntilLibStorageStopped blocks until libStorage is stopped.
func WaitUntilLibStorageStopped(ctx apitypes.Context, errs <-chan error) {
ctx.Debug("waiting until libStorage is stopped")
// if there is no err channel then do not wait until libStorage is stopped
// as the absence of the err channel means libStorage was not started in
// embedded mode
if errs == nil {
ctx.Debug("done waiting on err chan; err chan is nil")
return
}
// in a goroutine, range over the apiserver.Close channel until it's closed
for range apiserver.Close() {
}
ctx.Debug("done sending close signals to libStorage")
// block until the err channel is closed
for range errs {
}
ctx.Debug("done waiting on err chan")
}
var localHostRX = regexp.MustCompile(
`(?i)^(localhost|(?:127\.0\.0\.1))(?::(\d+))?$`)
// IsLocalServerActive returns a flag indicating whether or not a local
// libStorage is already running.
func IsLocalServerActive(
ctx apitypes.Context, config gofig.Config) (host string, running bool) {
host = config.GetString(apitypes.ConfigHost)
if host == "" {
return "", false
}
proto, addr, err := gotil.ParseAddress(host)
if err != nil {
return "", false
}
switch proto {
case "unix":
ctx.WithField("sock", addr).Debug("is local unix server active")
return host, gotil.FileExists(addr)
case "tcp":
m := localHostRX.FindStringSubmatch(addr)
if len(m) < 3 {
return "", false
}
port, err := strconv.Atoi(m[2])
if err != nil {
return "", false
}
ctx.WithField("port", port).Debug("is local tcp server active")
return host, !gotil.IsTCPPortAvailable(port)
}
return "", false
}
// ActivateLibStorage activates a libStorage server if conditions are met and
// returns a possibly mutated context.
func ActivateLibStorage(
ctx apitypes.Context,
config gofig.Config) (apitypes.Context, gofig.Config, <-chan error, error) {
config = config.Scope("rexray")
// set the `libstorage.service` property to the value of
// `rexray.storageDrivers` if the former is not defined and the
// latter is
if !config.IsSet(apitypes.ConfigService) &&
config.IsSet("rexray.storageDrivers") {
if sd := config.GetStringSlice("rexray.storageDrivers"); len(sd) > 0 {
config.Set(apitypes.ConfigService, sd[0])
} else if sd := config.GetString("rexray.storageDrivers"); sd != "" {
config.Set(apitypes.ConfigService, sd)
}
}
if !config.IsSet(apitypes.ConfigIgVolOpsMountPath) {
config.Set(apitypes.ConfigIgVolOpsMountPath, LibFilePath("volumes"))
}
var (
host string
err error
isRunning bool
errs <-chan error
server apitypes.Server
)
if host = config.GetString(apitypes.ConfigHost); host != "" {
if !config.GetBool(apitypes.ConfigEmbedded) {
ctx.WithField(
"host", host,
).Debug("not starting embeddded server; embedded mode disabled")
return ctx, config, nil, nil
}
}
if host, isRunning = IsLocalServerActive(ctx, config); isRunning {
ctx = ctx.WithValue(context.HostKey, host)
ctx.WithField("host", host).Debug(
"not starting embeddded server; already running")
return ctx, config, nil, nil
}
// if no host was specified then see if a set of default services need to
// be initialized
if host == "" {
if err = initDefaultLibStorageServices(ctx, config); err != nil {
return ctx, config, nil, err
}
}
ctx.Debug("starting embedded libStorage server")
if server, errs, err = apiserver.Serve(ctx, config); err != nil {
return ctx, config, nil, err
}
go func() {
if err := <-errs; err != nil {
ctx.Error(err)
}
}()
if host == "" {
config.Set(apitypes.ConfigHost, server.Addrs()[0])
}
return ctx, config, errs, nil
}