diff options
Diffstat (limited to 'vendor/github.com/coreos/go-systemd/v22/journal/journal.go')
-rw-r--r-- | vendor/github.com/coreos/go-systemd/v22/journal/journal.go | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/vendor/github.com/coreos/go-systemd/v22/journal/journal.go b/vendor/github.com/coreos/go-systemd/v22/journal/journal.go index a0f4837a0..ac24c7767 100644 --- a/vendor/github.com/coreos/go-systemd/v22/journal/journal.go +++ b/vendor/github.com/coreos/go-systemd/v22/journal/journal.go @@ -23,20 +23,7 @@ package journal import ( - "bytes" - "encoding/binary" - "errors" "fmt" - "io" - "io/ioutil" - "net" - "os" - "strconv" - "strings" - "sync" - "sync/atomic" - "syscall" - "unsafe" ) // Priority of a journal message @@ -53,173 +40,7 @@ const ( PriDebug ) -var ( - // This can be overridden at build-time: - // https://github.com/golang/go/wiki/GcToolchainTricks#including-build-information-in-the-executable - journalSocket = "/run/systemd/journal/socket" - - // unixConnPtr atomically holds the local unconnected Unix-domain socket. - // Concrete safe pointer type: *net.UnixConn - unixConnPtr unsafe.Pointer - // onceConn ensures that unixConnPtr is initialized exactly once. - onceConn sync.Once -) - -func init() { - onceConn.Do(initConn) -} - -// Enabled checks whether the local systemd journal is available for logging. -func Enabled() bool { - onceConn.Do(initConn) - - if (*net.UnixConn)(atomic.LoadPointer(&unixConnPtr)) == nil { - return false - } - - if _, err := net.Dial("unixgram", journalSocket); err != nil { - return false - } - - return true -} - -// Send a message to the local systemd journal. vars is a map of journald -// fields to values. Fields must be composed of uppercase letters, numbers, -// and underscores, but must not start with an underscore. Within these -// restrictions, any arbitrary field name may be used. Some names have special -// significance: see the journalctl documentation -// (http://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html) -// for more details. vars may be nil. -func Send(message string, priority Priority, vars map[string]string) error { - conn := (*net.UnixConn)(atomic.LoadPointer(&unixConnPtr)) - if conn == nil { - return errors.New("could not initialize socket to journald") - } - - socketAddr := &net.UnixAddr{ - Name: journalSocket, - Net: "unixgram", - } - - data := new(bytes.Buffer) - appendVariable(data, "PRIORITY", strconv.Itoa(int(priority))) - appendVariable(data, "MESSAGE", message) - for k, v := range vars { - appendVariable(data, k, v) - } - - _, _, err := conn.WriteMsgUnix(data.Bytes(), nil, socketAddr) - if err == nil { - return nil - } - if !isSocketSpaceError(err) { - return err - } - - // Large log entry, send it via tempfile and ancillary-fd. - file, err := tempFd() - if err != nil { - return err - } - defer file.Close() - _, err = io.Copy(file, data) - if err != nil { - return err - } - rights := syscall.UnixRights(int(file.Fd())) - _, _, err = conn.WriteMsgUnix([]byte{}, rights, socketAddr) - if err != nil { - return err - } - - return nil -} - // Print prints a message to the local systemd journal using Send(). func Print(priority Priority, format string, a ...interface{}) error { return Send(fmt.Sprintf(format, a...), priority, nil) } - -func appendVariable(w io.Writer, name, value string) { - if err := validVarName(name); err != nil { - fmt.Fprintf(os.Stderr, "variable name %s contains invalid character, ignoring\n", name) - } - if strings.ContainsRune(value, '\n') { - /* When the value contains a newline, we write: - * - the variable name, followed by a newline - * - the size (in 64bit little endian format) - * - the data, followed by a newline - */ - fmt.Fprintln(w, name) - binary.Write(w, binary.LittleEndian, uint64(len(value))) - fmt.Fprintln(w, value) - } else { - /* just write the variable and value all on one line */ - fmt.Fprintf(w, "%s=%s\n", name, value) - } -} - -// validVarName validates a variable name to make sure journald will accept it. -// The variable name must be in uppercase and consist only of characters, -// numbers and underscores, and may not begin with an underscore: -// https://www.freedesktop.org/software/systemd/man/sd_journal_print.html -func validVarName(name string) error { - if name == "" { - return errors.New("Empty variable name") - } else if name[0] == '_' { - return errors.New("Variable name begins with an underscore") - } - - for _, c := range name { - if !(('A' <= c && c <= 'Z') || ('0' <= c && c <= '9') || c == '_') { - return errors.New("Variable name contains invalid characters") - } - } - return nil -} - -// isSocketSpaceError checks whether the error is signaling -// an "overlarge message" condition. -func isSocketSpaceError(err error) bool { - opErr, ok := err.(*net.OpError) - if !ok || opErr == nil { - return false - } - - sysErr, ok := opErr.Err.(*os.SyscallError) - if !ok || sysErr == nil { - return false - } - - return sysErr.Err == syscall.EMSGSIZE || sysErr.Err == syscall.ENOBUFS -} - -// tempFd creates a temporary, unlinked file under `/dev/shm`. -func tempFd() (*os.File, error) { - file, err := ioutil.TempFile("/dev/shm/", "journal.XXXXX") - if err != nil { - return nil, err - } - err = syscall.Unlink(file.Name()) - if err != nil { - return nil, err - } - return file, nil -} - -// initConn initializes the global `unixConnPtr` socket. -// It is meant to be called exactly once, at program startup. -func initConn() { - autobind, err := net.ResolveUnixAddr("unixgram", "") - if err != nil { - return - } - - sock, err := net.ListenUnixgram("unixgram", autobind) - if err != nil { - return - } - - atomic.StorePointer(&unixConnPtr, unsafe.Pointer(sock)) -} |