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125 lines
3 KiB
Go
125 lines
3 KiB
Go
// +build linux
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// Package journald provides the log driver for forwarding server logs
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// to endpoints that receive the systemd format.
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package journald
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import (
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"fmt"
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"sync"
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"unicode"
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"github.com/Sirupsen/logrus"
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"github.com/coreos/go-systemd/journal"
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"github.com/docker/docker/daemon/logger"
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"github.com/docker/docker/daemon/logger/loggerutils"
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)
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const name = "journald"
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type journald struct {
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mu sync.Mutex
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vars map[string]string // additional variables and values to send to the journal along with the log message
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readers readerList
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closed bool
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}
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type readerList struct {
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readers map[*logger.LogWatcher]*logger.LogWatcher
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}
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func init() {
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if err := logger.RegisterLogDriver(name, New); err != nil {
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logrus.Fatal(err)
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}
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if err := logger.RegisterLogOptValidator(name, validateLogOpt); err != nil {
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logrus.Fatal(err)
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}
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}
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// sanitizeKeyMode returns the sanitized string so that it could be used in journald.
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// In journald log, there are special requirements for fields.
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// Fields must be composed of uppercase letters, numbers, and underscores, but must
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// not start with an underscore.
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func sanitizeKeyMod(s string) string {
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n := ""
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for _, v := range s {
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if 'a' <= v && v <= 'z' {
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v = unicode.ToUpper(v)
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} else if ('Z' < v || v < 'A') && ('9' < v || v < '0') {
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v = '_'
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}
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// If (n == "" && v == '_'), then we will skip as this is the beginning with '_'
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if !(n == "" && v == '_') {
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n += string(v)
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}
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}
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return n
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}
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// New creates a journald logger using the configuration passed in on
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// the context.
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func New(info logger.Info) (logger.Logger, error) {
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if !journal.Enabled() {
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return nil, fmt.Errorf("journald is not enabled on this host")
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}
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// parse log tag
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tag, err := loggerutils.ParseLogTag(info, loggerutils.DefaultTemplate)
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if err != nil {
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return nil, err
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}
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vars := map[string]string{
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"CONTAINER_ID": info.ContainerID[:12],
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"CONTAINER_ID_FULL": info.ContainerID,
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"CONTAINER_NAME": info.Name(),
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"CONTAINER_TAG": tag,
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}
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extraAttrs, err := info.ExtraAttributes(sanitizeKeyMod)
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if err != nil {
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return nil, err
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}
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for k, v := range extraAttrs {
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vars[k] = v
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}
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return &journald{vars: vars, readers: readerList{readers: make(map[*logger.LogWatcher]*logger.LogWatcher)}}, nil
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}
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// We don't actually accept any options, but we have to supply a callback for
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// the factory to pass the (probably empty) configuration map to.
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func validateLogOpt(cfg map[string]string) error {
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for key := range cfg {
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switch key {
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case "labels":
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case "env":
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case "env-regex":
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case "tag":
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default:
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return fmt.Errorf("unknown log opt '%s' for journald log driver", key)
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}
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}
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return nil
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}
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func (s *journald) Log(msg *logger.Message) error {
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vars := map[string]string{}
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for k, v := range s.vars {
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vars[k] = v
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}
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if msg.Partial {
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vars["CONTAINER_PARTIAL_MESSAGE"] = "true"
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}
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line := string(msg.Line)
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logger.PutMessage(msg)
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if msg.Source == "stderr" {
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return journal.Send(line, journal.PriErr, vars)
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}
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return journal.Send(line, journal.PriInfo, vars)
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}
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func (s *journald) Name() string {
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return name
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}
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