func startCmd(cmdName string, args ...string) (*exec.Cmd, error) {
var err error
lvl := syslog.Priority(stdoutLevel) | syslog.Priority(facility)
stdoutLog, err = syslog.New(lvl, tag)
if err != nil {
log.Fatalf("Error initializing stdout syslog: %v", err)
}
lvl = syslog.Priority(stderrLevel) | syslog.Priority(facility)
stderrLog, err = syslog.New(lvl, tag)
if err != nil {
log.Fatalf("Error initializing stderr syslog: %v", err)
}
cmd := exec.Command(cmdName, args...)
cmd.Stdin = os.Stdin
stdoutPipe, err := cmd.StdoutPipe()
if err != nil {
log.Fatalf("Error initializing stdout pipe: %v", err)
}
stderrPipe, err := cmd.StderrPipe()
if err != nil {
log.Fatalf("Error initializing stderr pipe: %v", err)
}
wg.Add(2)
go logPipe(stdoutLog, stdoutPipe)
go logPipe(stderrLog, stderrPipe)
return cmd, cmd.Start()
}
// newPriority creates a new default priority
func (d *DockerLogParser) newPriority(p int) Priority {
// The Priority value is calculated by first multiplying the Facility
// number by 8 and then adding the numerical value of the Severity.
return Priority{
Pri: p,
Facility: syslog.Priority(p / 8),
Severity: syslog.Priority(p % 8),
}
}
func parseFacility(facility string) (syslog.Priority, error) {
if facility == "" {
return syslog.LOG_DAEMON, nil
}
if syslogFacility, valid := facilities[facility]; valid {
return syslogFacility, nil
}
fInt, err := strconv.Atoi(facility)
if err == nil && 0 <= fInt && fInt <= 23 {
return syslog.Priority(fInt << 3), nil
}
return syslog.Priority(0), errors.New("invalid syslog facility")
}
func (c *sysLogger) LoadConfig(config map[string]interface{}) error {
if level, ok := config["level"]; ok {
c.level = level.(int)
} else {
c.level = LevelDebug
}
if sysLevel, ok := config["sysLevel"]; ok {
c.sysLevel = LocalLevel[sysLevel.(int)]
} else {
c.sysLevel = syslog.LOG_LOCAL6
}
var Flags int
if flags, ok := config["flags"]; ok {
Flags = flags.(int)
} else {
Flags = 9
}
var err error
c.logger, err = syslog.NewLogger(syslog.LOG_NOTICE|syslog.Priority(c.sysLevel), Flags)
if err != nil {
return errors.New("syslog newLogger error")
}
return nil
}
// SyslogSink returns a sink that outputs to the local syslog daemon.
func SyslogSink(p Priority, tag, format string, fields []string) (*syslogSink, error) {
prio := syslog.Priority(p) | syslog.LOG_USER
w, err := syslog.New(prio, tag)
if err != nil {
return nil, err
}
return &syslogSink{w, p, format, fields}, nil
}
// NewSyslogOutput returns a TextOutput object that writes to syslog using
// the given facility and tag. The log level will be determined by the log
// event.
func NewSyslogOutput(facility SyslogPriority, tag string) (
TextOutput, error) {
w, err := syslog.New(syslog.Priority(facility), tag)
if err != nil {
return nil, err
}
return &SyslogOutput{w: w}, nil
}
// NewLogger is used to construct a new Syslogger
func NewLogger(p Priority, tag string) (Syslogger, error) {
priority := syslog.Priority(p) | syslog.LOG_DAEMON
l, err := syslog.New(priority, tag)
if err != nil {
return nil, err
}
return &builtinLogger{l}, nil
}
// establishes the connection to syslog.
func (conf *syslogModuleConfig) connectToSyslog(
network,
raddr string,
facility int,
tag string) error {
facilityName, err := FacilityValueToName(facility)
if err != nil {
return err
}
var priority goSyslog.Priority = goSyslog.Priority(facility<<3) | goSyslog.LOG_INFO
conf.network = network
conf.raddr = raddr
conf.facility = facility
conf.tag = tag
conf.syslogConn, err = goSyslog.Dial(network, raddr, priority, tag)
if err != nil {
log.Printf("Could not open connection to syslog, reason: " + err.Error())
return err
}
if conf.syslogConn == nil {
log.Printf("Could not retrieve connection to syslog")
return fmt.Errorf("Could not retrieve connection to syslog")
}
conf.syslogConn.Debug(
fmt.Sprintf(
"rlog syslog (re)connected with facility=%d(%s), tag=\"%s\"",
facility,
facilityName,
tag))
conf.syslogConn.Debug(
fmt.Sprintf(
"rlog syslog network=\"%s\", raddr=\"%s\", heartBeatFilePath=\"%s\"",
network,
raddr,
conf.heartBeatFilePath))
// FIX: heartbeat for debugging only.
if conf.heartBeatFilePath != "" {
parentDir, _ := filepath.Split(conf.heartBeatFilePath)
if parentDir != "" {
var dirMode os.FileMode = 0775 // user/group-only read/write/traverse, world read/traverse
err = os.MkdirAll(parentDir, dirMode)
if err != nil {
return err
}
}
err = conf.writeHeartBeat("Starting heartbeat...", true)
if err != nil {
return err
}
}
return nil
}
func openSyslog(level Priority, prefix string) *log.Logger {
logger, err := syslog.NewLogger(syslog.Priority(level), log.Lshortfile)
if err != nil {
fmt.Println("Error opening syslog: ", err)
return nil
}
logger.SetPrefix(prefix)
return logger
}
func TestInvalidSeverity(t *testing.T) {
fw := &fakeWriter{}
writer = fw
event.Dispatch(&TestEvent{priority: syslog.Priority(123), message: "log me"})
if fw.message == "log me" {
t.Errorf("message was logged despite invalid severity")
}
}
// NewLogger is used to construct a new Syslogger
func NewLogger(p Priority, facility, tag string) (Syslogger, error) {
fPriority, err := facilityPriority(facility)
if err != nil {
return nil, err
}
priority := syslog.Priority(p) | fPriority
l, err := newBuiltin(priority, tag)
if err != nil {
return nil, err
}
return &builtinLogger{l}, nil
}
// DialLogger is used to construct a new Syslogger that establishes connection to remote syslog server
func DialLogger(network, raddr string, p Priority, facility, tag string) (Syslogger, error) {
fPriority, err := facilityPriority(facility)
if err != nil {
return nil, err
}
priority := syslog.Priority(p) | fPriority
l, err := dialBuiltin(network, raddr, priority, tag)
if err != nil {
return nil, err
}
return &builtinLogger{l}, nil
}
func LogInit(level Priority, prefix string, toSyslog bool, debugSelectors []string) {
_log.toSyslog = toSyslog
_log.level = syslog.Priority(level)
_log.selectors = make(map[string]bool)
for _, selector := range debugSelectors {
_log.selectors[selector] = true
}
if _log.toSyslog {
for prio := syslog.LOG_EMERG; prio <= syslog.LOG_DEBUG; prio++ {
_log.syslog[prio] = openSyslog(prio, prefix)
}
} else {
_log.logger = log.New(os.Stdout, prefix, log.Lshortfile)
}
}
func lookup(str string) (syslog.Priority, error) {
n, err := strconv.ParseInt(str, 64, 0)
if err == nil {
return syslog.Priority(n), nil
}
facility, priority := "user", "notice"
if i := strings.IndexRune(str, '.'); i > 0 {
facility, priority = str[:i], str[i+1:]
} else {
priority = str
}
facility = strings.ToLower(facility)
priority = strings.ToLower(priority)
var p syslog.Priority
switch facility {
case "kern":
p |= syslog.LOG_KERN
case "user":
p |= syslog.LOG_USER
case "mail":
p |= syslog.LOG_MAIL
case "daemon":
p |= syslog.LOG_DAEMON
case "auth":
p |= syslog.LOG_AUTH
case "syslog":
p |= syslog.LOG_SYSLOG
case "lpr":
p |= syslog.LOG_LPR
case "news":
p |= syslog.LOG_NEWS
case "uucp":
p |= syslog.LOG_UUCP
case "cron":
p |= syslog.LOG_CRON
case "authpriv":
p |= syslog.LOG_AUTHPRIV
case "ftp":
p |= syslog.LOG_FTP
case "local0":
p |= syslog.LOG_LOCAL0
case "local1":
p |= syslog.LOG_LOCAL1
case "local2":
p |= syslog.LOG_LOCAL2
case "local3":
p |= syslog.LOG_LOCAL3
case "local4":
p |= syslog.LOG_LOCAL4
case "local5":
p |= syslog.LOG_LOCAL5
case "local6":
p |= syslog.LOG_LOCAL6
case "local7":
p |= syslog.LOG_LOCAL7
default:
return 0, fmt.Errorf("invalid facility %q", facility)
}
switch priority {
case "emerg":
p |= syslog.LOG_EMERG
case "alert":
p |= syslog.LOG_ALERT
case "crit":
p |= syslog.LOG_CRIT
case "err":
p |= syslog.LOG_ERR
case "warning":
p |= syslog.LOG_WARNING
case "notice":
p |= syslog.LOG_NOTICE
case "info":
p |= syslog.LOG_INFO
case "debug":
p |= syslog.LOG_DEBUG
default:
return 0, fmt.Errorf("invalid priority %q", priority)
}
return p, nil
}
func NewSyslogFormatter(format string) *SyslogFormatter {
hostname, _ := os.Hostname()
return &SyslogFormatter{NewPatFormatter(format), os.Getpid(), hostname, os.Args[0], syslog.Priority(1 << 3), DefaultSeverityMap}
}
func (l logLevel) String() string {
return levelStrings[syslog.Priority(l)&7]
}
func (l logFacility) String() string {
return facilityStrings[syslog.Priority(l)&^7]
}
func main() {
flag.Parse()
// Set logTarget
if *logTarget == "" {
logger = log.New(os.Stdout, "LOG ", log.LstdFlags)
debugLogger = log.New(os.Stdout, "DEBUG ", log.LstdFlags)
} else {
u, err := url.Parse(*logTarget)
if err != nil {
log.Fatalln("fatal: unable to parse logtarget url", err)
}
query, _ := url.ParseQuery(u.RawQuery)
switch {
case (u.Scheme == "" || u.Scheme == "file") && u.Path != "":
var logFile *os.File
fileMode := os.FileMode(*logPermission)
_, err = os.Stat(u.Path)
if os.IsNotExist(err) {
logFile, err = os.Create(u.Path)
if err != nil {
log.Fatalln("fatal: unable to create log target", err)
}
err = os.Chmod(u.Path, fileMode)
if err != nil {
log.Fatalln("fatal: unable to set file permissions", err)
}
} else {
logFile, err = os.OpenFile(u.Path, os.O_WRONLY|os.O_APPEND, fileMode)
if err != nil {
log.Fatalln("fatal: unable to open log target", err)
}
}
defer logFile.Close()
logTargetWriter = io.Writer(logFile)
// Check if logTarget is writable
_, err = logTargetWriter.Write([]byte(""))
if err != nil {
log.Fatalln("fatal: unable to write to log target")
}
case strings.HasPrefix(u.Scheme, "syslog"):
var syslogLogger *syslog.Writer
var tag string
priority := int(syslog.LOG_NOTICE | syslog.LOG_LOCAL0)
if query["priority"][0] != "" {
priority, err = strconv.Atoi(query["priority"][0])
if err != nil {
log.Fatalln("fatal: unable to connect to syslog", *logTarget, "err:", err)
}
}
if query["tag"][0] != "" {
tag = query["tag"][0]
}
if u.Host == "" {
syslogLogger, err = syslog.New(syslog.Priority(priority), tag)
if err != nil {
log.Fatalln("fatal: unable to connect to syslog", *logTarget, "err:", err)
}
} else {
schemeParts := strings.Split(u.Scheme, "+")
network := "tcp"
if len(schemeParts) > 1 {
network = schemeParts[1]
}
_, _, err := net.SplitHostPort(u.Host)
if err != nil {
u.Host = u.Host + ":514"
}
syslogLogger, err = syslog.Dial(network, u.Host, syslog.Priority(priority), tag)
if err != nil {
log.Fatalln("fatal: unable to connect to syslog", *logTarget, "err:", err)
}
}
defer syslogLogger.Close()
logTargetWriter = io.Writer(syslogLogger)
default:
log.Fatalln("fatal: no valid schema:", *logTarget)
}
logger = log.New(logTargetWriter, "LOG ", log.LstdFlags)
debugLogger = log.New(logTargetWriter, "DEBUG ", log.LstdFlags)
}
// Set log-function based on log level
switch *logLevel {
case 0:
logf = emptyLogf
case 2:
debugf = debugLogf
default:
}
// Write example log lines
logf("log output %s, %d", "string1", 10)
debugf("debug output %s, %d", "string1", 10)
}
// runMain is a main function which returns programs exit value.
func runMain() int {
var err error
LOG, err = wl.New("goanysync", syslog.Priority(0), wl.DEFAULT_LOG_LEVEL)
if err != nil {
fmt.Fprintf(os.Stderr, "Error: Logger initialization failed with error: %s\n", err)
return 1
}
// Check that at least one argument given
if len(os.Args) < 2 {
LOG.Err("No command given.")
return 1
}
configFilePath := flag.String("c", "/etc/goanysync.conf", "Config file.")
verbose := flag.Bool("v", false, "Be more verbose with console messages.")
syslogLogLevel := flag.Int("sl", int(wl.DEFAULT_LOG_LEVEL), "Set syslog log level.")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s %s:\n", os.Args[0], "[options] <command>")
fmt.Fprintf(os.Stderr, " Commands:\n")
fmt.Fprintf(os.Stderr, " initsync\tReplaces sync directories with symlinks to tmpfs while syncing orginal content there.\n")
fmt.Fprintf(os.Stderr, " sync\t\tSyncs content from tmpfs to the backup.\n")
fmt.Fprintf(os.Stderr, " unsync\tRestores orginal state of sync directories.\n")
fmt.Fprintf(os.Stderr, " check\tChecks if sync was called without unsync before tmpfs was cleared.\n")
fmt.Fprintf(os.Stderr, " start\tAlias for running check and initsync.\n")
fmt.Fprintf(os.Stderr, " stop\t\tAlias for running sync and unsync.\n")
fmt.Fprintf(os.Stderr, " info\t\tGives information about current sync status.\n")
fmt.Fprintf(os.Stderr, " Options:\n")
flag.PrintDefaults()
if *verbose {
fmt.Fprintf(os.Stderr, " Log levels:\n")
for i := 0; i < len(wl.LOG_LEVELS); i++ {
fmt.Fprintf(os.Stderr, " %d: %s\n", i, wl.LOG_LEVELS[syslog.Priority(i)])
}
}
}
flag.Parse()
LOG.SetSyslogPriority(syslog.Priority(*syslogLogLevel))
if *verbose {
LOG.SetConsoleLogPriority(syslog.LOG_DEBUG)
}
// Read config file
copts, err := ReadConfigFile(*configFilePath)
if err != nil {
LOG.Err("Config file: %s", err)
return 1
}
if *verbose {
copts.Print()
}
// For now do not allow synchronous calls at all.
// Check that lock files base path
if err = checkLockFileDir(path.Dir(copts.lockfile)); err != nil {
LOG.Err("Lock file path: %s", err)
return 1
}
// Locking to prevent synchronous operations
for ok, err := getLock(copts.lockfile); !ok; ok, err = getLock(copts.lockfile) {
if err != nil {
LOG.Err("Lock file: %s", err)
return 1
}
// TODO: specify max wait time
// TODO: use inotify when go provides an interface for it
time.Sleep(time.Millisecond * 100)
}
// If os.Exit() is called remember to remove the lock file, manually.
defer releaseLock(copts.lockfile)
switch flag.Arg(0) {
case "info":
info(copts)
case "check":
checkAndFix(copts.tmpfsPath, &copts.syncPaths)
case "initsync":
if err := initSync(copts.tmpfsPath, &copts.syncPaths, copts.syncerBin); err != nil {
LOG.Err(err.Error())
return 1
}
case "sync":
sync(copts.tmpfsPath, &copts.syncPaths, copts.syncerBin)
case "unsync":
unsync(copts.tmpfsPath, &copts.syncPaths, true)
case "start":
// Check that given TMPFS path does not contain any extra paths which
// are not in syncPaths and might not be synced back
if ok := checkVolatile(copts.tmpfsPath, &copts.syncPaths); !ok {
return 1
}
checkAndFix(copts.tmpfsPath, &copts.syncPaths)
if err := initSync(copts.tmpfsPath, &copts.syncPaths, copts.syncerBin); err != nil {
LOG.Err(err.Error())
return 1
}
case "stop":
sync(copts.tmpfsPath, &copts.syncPaths, copts.syncerBin)
unsync(copts.tmpfsPath, &copts.syncPaths, true)
// If not all volatile paths were synced back issue a warning
// XXX: checkVolatile actually warns only about volatile paths not in
// syncPaths, so if unsync left something from syncPaths unsynced then
// checkVolatile would not notice a problem.
if ok := checkVolatile(copts.tmpfsPath, &copts.syncPaths); !ok {
return 1
}
default:
LOG.Err("Invalid command provided", err)
flag.Usage()
return 1
}
return 0
}
