1 files changed, 275 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/github.com/ssgreg/journald@v1.0.0/send.go b/dependencies/pkg/mod/github.com/ssgreg/journald@v1.0.0/send.go
new file mode 100644
index 0000000..19948cf
--- /dev/null
+++ b/dependencies/pkg/mod/github.com/ssgreg/journald@v1.0.0/send.go
@@ -0,0 +1,275 @@
+// Copyright 2017 Grigory Zubankov. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+//
+
+package journald
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"os"
+	"strconv"
+	"sync"
+	"syscall"
+)
+
+// Priority is the numeric message priority value as known from BSD syslog
+type Priority int
+
+// Priority values
+const (
+	PriorityEmerg Priority = iota
+	PriorityAlert
+	PriorityCrit
+	PriorityErr
+	PriorityWarning
+	PriorityNotice
+	PriorityInfo
+	PriorityDebug
+)
+
+var (
+	addr = &net.UnixAddr{Name: "/run/systemd/journal/socket", Net: "unixgram"}
+
+	// DefaultJournal is the default journal and is used by Print and Send.
+	DefaultJournal = &Journal{}
+)
+
+// IsNotExist checks if the system journal is not exist.
+func IsNotExist() bool {
+	_, err := os.Stat(addr.Name)
+	return os.IsNotExist(err)
+}
+
+// Journal keeps a connection to the system journal
+type Journal struct {
+	once    sync.Once
+	conn    *net.UnixConn
+	connErr error
+
+	// NormalizeFieldNameFn is a hook that allows client to change
+	// fields names just before sending if set.
+	//
+	// Default value is nil.
+	// string.ToUpper is a good example of the hook usage.
+	NormalizeFieldNameFn func(string) string
+
+	// TestModeEnabled allows Journal to do nothing. All messages are
+	// discarding.
+	TestModeEnabled bool
+}
+
+// Print may be used to submit simple, plain text log entries to the
+// system journal. The first argument is a priority value. This is
+// followed by a format string and its parameters.
+func (j *Journal) Print(p Priority, format string, a ...interface{}) error {
+	return j.Send(fmt.Sprintf(format, a...), p, nil)
+}
+
+// WriteMsg writes the given bytes to the systemd journal's socket.
+// The caller is in charge of correct data format.
+func (j *Journal) WriteMsg(data []byte) error {
+	if j.TestModeEnabled {
+		return nil
+	}
+
+	c, err := j.journalConn()
+	if err != nil {
+		return err
+	}
+
+	_, _, err = c.WriteMsgUnix(data, nil, addr)
+	if err == nil {
+		return nil
+	}
+	errno := toErrno(err)
+	if errno != syscall.EMSGSIZE && errno != syscall.ENOBUFS {
+		return err
+	}
+
+	// Message doesn't fit...
+
+	// TODO: user memfd when it will be available in go:
+	// http://man7.org/linux/man-pages/man2/memfd_create.2.html
+
+	f, err := openTempFileUnlinkable()
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = f.Write(data)
+	if err != nil {
+		return err
+	}
+	_, err = writeMsgUnix(c, syscall.UnixRights(int(f.Fd())), addr)
+
+	return err
+
+}
+
+// Send may be used to submit structured log entries to the system
+// journal. It takes a map of fields with names and values.
+//
+// The field names must be in uppercase and consist only of characters,
+// numbers and underscores, and may not begin with an underscore. All
+// fields that do not follow this syntax will be ignored. The value can
+// be of any size and format. A variable may be assigned more than one
+// value per entry.
+//
+// A number of well known fields are defined, see:
+// http://0pointer.de/public/systemd-man/systemd.journal-fields.html
+//
+func (j *Journal) Send(msg string, p Priority, fields map[string]interface{}) error {
+	return j.WriteMsg(j.marshal(msg, p, fields))
+}
+
+// Close closes the underlying connection.
+func (j *Journal) Close() error {
+	if j.connErr != nil {
+		return j.connErr
+	}
+	if j.conn == nil {
+		return nil
+	}
+
+	return j.conn.Close()
+}
+
+func (j *Journal) journalConn() (*net.UnixConn, error) {
+	j.once.Do(func() {
+		// File from UNIX socket. This is the only way to create a
+		// connect-less socket. Both Dial and ListenUnixgram do extra
+		// work it terms of connection.
+		//
+		// This UNIX socket is needed only to make a Conn on it's base.
+		// No reason to switch it to nonblocking mode and set additional
+		// flags. FileConn will do such things for us for Conn socket.
+		fd, err := syscall.Socket(syscall.AF_UNIX, syscall.SOCK_DGRAM, 0)
+		if err != nil {
+			j.connErr = err
+			return
+		}
+		f := os.NewFile(uintptr(fd), "base UNIX socket")
+		defer f.Close()
+
+		fc, err := net.FileConn(f)
+		if err != nil {
+			j.connErr = err
+			return
+		}
+		uc, ok := fc.(*net.UnixConn)
+		if !ok {
+			fc.Close()
+			j.connErr = errors.New("not a UNIX connection")
+			return
+		}
+		uc.SetWriteBuffer(8 * 1024 * 1024)
+		j.conn = uc
+	})
+
+	return j.conn, j.connErr
+}
+
+// Print may be used to submit simple, plain text log entries to the
+// system journal. The first argument is a priority value. This is
+// followed by a format string and its parameters.
+//
+// Print is a wrapper around DefaultJournal.Print.
+func Print(p Priority, format string, a ...interface{}) error {
+	return DefaultJournal.Print(p, format, a...)
+}
+
+// Send may be used to submit structured log entries to the system
+// journal. It takes a map of fields with names and values.
+//
+// The field names must be in uppercase and consist only of characters,
+// numbers and underscores, and may not begin with an underscore. All
+// fields that do not follow this syntax will be ignored. The value can
+// be of any size and format. A variable may be assigned more than one
+// value per entry.
+//
+// A number of well known fields are defined, see:
+// http://0pointer.de/public/systemd-man/systemd.journal-fields.html
+//
+// Send is a wrapper around DefaultJournal.Send.
+func Send(msg string, p Priority, fields map[string]interface{}) error {
+	return DefaultJournal.Send(msg, p, fields)
+}
+
+func toErrno(err error) syscall.Errno {
+	switch e := err.(type) {
+	case *net.OpError:
+		switch e := e.Err.(type) {
+		case *os.SyscallError:
+			return e.Err.(syscall.Errno)
+		}
+	}
+
+	return 0
+}
+
+func (j *Journal) marshal(msg string, p Priority, fields map[string]interface{}) []byte {
+	bb := new(bytes.Buffer)
+	j.writeField(bb, "PRIORITY", strconv.Itoa(int(p)))
+	j.writeField(bb, "MESSAGE", msg)
+	for k, v := range fields {
+		j.writeField(bb, k, v)
+	}
+
+	return bb.Bytes()
+}
+
+func (j *Journal) writeField(w io.Writer, name string, value interface{}) {
+	w.Write([]byte(j.normalizeFieldName(name)))
+	dv := valueToBytes(value)
+	if bytes.ContainsRune(dv, '\n') {
+		// According to the format, if the value includes a newline
+		// need to write the field name, plus a newline, then the
+		// size (64bit LE), the field data and a final newline.
+
+		w.Write([]byte{'\n'})
+		binary.Write(w, binary.LittleEndian, uint64(len(dv)))
+	} else {
+		w.Write([]byte{'='})
+	}
+	w.Write(dv)
+	w.Write([]byte{'\n'})
+}
+
+func (j *Journal) normalizeFieldName(s string) string {
+	if j.NormalizeFieldNameFn != nil {
+		return j.NormalizeFieldNameFn(s)
+	}
+	return s
+}
+
+func valueToBytes(value interface{}) []byte {
+	switch rv := value.(type) {
+	case string:
+		return []byte(rv)
+	case []byte:
+		return rv
+	default:
+		return []byte(fmt.Sprint(value))
+	}
+}
+
+func openTempFileUnlinkable() (*os.File, error) {
+	f, err := ioutil.TempFile("/dev/shm/", "journald-send-tmp")
+	if err != nil {
+		return nil, err
+	}
+	// The file will be deleted just after the systemd will close passed fd.
+	err = syscall.Unlink(f.Name())
+	if err != nil {
+		return nil, err
+	}
+
+	return f, nil
+}