[#736] logger: Add journald support

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

cmd/frostfs-ir/main.go

@@ -68,6 +68,10 @@ func main() {
 		cfg.GetString("logger.level"),
 	)
 	exitErr(err)
+	err = logPrm.SetDestination(
+		cfg.GetString("logger.destination"),
+	)
+	exitErr(err)
 	logPrm.SamplingHook = metrics.LogMetrics().GetSamplingHook()
 	log, err = logger.NewLogger(logPrm)
 	exitErr(err)

cmd/frostfs-node/config.go

@@ -96,7 +96,8 @@ type applicationConfiguration struct {
 	_read bool
 
 	LoggerCfg struct {
-		level string
+		level       string
+		destination string
 	}
 
 	EngineCfg struct {
@@ -209,6 +210,7 @@ func (a *applicationConfiguration) readConfig(c *config.Config) error {
 	// Logger
 
 	a.LoggerCfg.level = loggerconfig.Level(c)
+	a.LoggerCfg.destination = loggerconfig.Destination(c)
 
 	// Storage Engine
 
@@ -1010,6 +1012,11 @@ func (c *cfg) loggerPrm() (*logger.Prm, error) {
 		// not expected since validation should be performed before
 		panic(fmt.Sprintf("incorrect log level format: %s", c.LoggerCfg.level))
 	}
+	err = c.dynamicConfiguration.logger.SetDestination(c.LoggerCfg.destination)
+	if err != nil {
+		// not expected since validation should be performed before
+		panic(fmt.Sprintf("incorrect log destination format: %s", c.LoggerCfg.destination))
+	}
 
 	return c.dynamicConfiguration.logger, nil
 }

cmd/frostfs-node/config/logger/config.go

@@ -5,12 +5,14 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/logging/lokicore/loki"
 )
 
 const (
 	// LevelDefault is a default logger level.
 	LevelDefault              = "info"
+	DestinationDefault        = logger.DestinationStdout
 	subsection                = "logger"
 	lokiSubsection            = "loki"
 	AddressDefault            = "localhost:3100"
@@ -34,6 +36,22 @@ func Level(c *config.Config) string {
 	return LevelDefault
 }
 
+// Destination returns the value of "destination" config parameter
+// from "logger" section.
+//
+// Returns DestinationDefault if the value is not a non-empty string.
+func Destination(c *config.Config) string {
+	v := config.StringSafe(
+		c.Sub(subsection),
+		"destination",
+	)
+	if v != "" {
+		return v
+	}
+
+	return DestinationDefault
+}
+
 // ToLokiConfig extracts loki config.
 func ToLokiConfig(c *config.Config) loki.Config {
 	hostname, _ := os.Hostname()

cmd/frostfs-node/config/logger/config_test.go

@@ -11,15 +11,15 @@ import (
 
 func TestLoggerSection_Level(t *testing.T) {
 	t.Run("defaults", func(t *testing.T) {
-		v := loggerconfig.Level(configtest.EmptyConfig())
+		require.Equal(t, loggerconfig.LevelDefault, loggerconfig.Level(configtest.EmptyConfig()))
-		require.Equal(t, loggerconfig.LevelDefault, v)
+		require.Equal(t, loggerconfig.DestinationDefault, loggerconfig.Destination(configtest.EmptyConfig()))
 	})
 
 	const path = "../../../../config/example/node"
 
 	fileConfigTest := func(c *config.Config) {
-		v := loggerconfig.Level(c)
+		require.Equal(t, "debug", loggerconfig.Level(c))
-		require.Equal(t, "debug", v)
+		require.Equal(t, "journald", loggerconfig.Destination(c))
 	}
 
 	configtest.ForEachFileType(path, fileConfigTest)

cmd/frostfs-node/validate.go

@@ -25,6 +25,11 @@ func validateConfig(c *config.Config) error {
 		return fmt.Errorf("invalid logger level: %w", err)
 	}
 
+	err = loggerPrm.SetDestination(loggerconfig.Destination(c))
+	if err != nil {
+		return fmt.Errorf("invalid logger destination: %w", err)
+	}
+
 	// shard configuration validation
 
 	shardNum := 0

config/example/node.env

@@ -1,4 +1,5 @@
 FROSTFS_LOGGER_LEVEL=debug
+FROSTFS_LOGGER_DESTINATION=journald
 
 FROSTFS_PPROF_ENABLED=true
 FROSTFS_PPROF_ADDRESS=localhost:6060

config/example/node.json

@@ -1,6 +1,7 @@
 {
   "logger": {
-    "level": "debug"
+    "level": "debug",
+    "destination": "journald"
   },
   "pprof": {
     "enabled": true,

config/example/node.yaml

@@ -1,5 +1,6 @@
 logger:
   level: debug  # logger level: one of "debug", "info" (default), "warn", "error", "dpanic", "panic", "fatal"
+  destination: journald # logger destination: one of "stdout" (default), "journald"
 
 systemdnotify:
   enabled: true

go.mod

@@ -10,6 +10,7 @@ require (
 	git.frostfs.info/TrueCloudLab/hrw v1.2.1
 	git.frostfs.info/TrueCloudLab/policy-engine v0.0.0-20240129064140-8d21ab2d99d9
 	git.frostfs.info/TrueCloudLab/tzhash v1.8.0
+	git.frostfs.info/TrueCloudLab/zapjournald v0.0.0-20240124114243-cb2e66427d02
 	github.com/cheggaaa/pb v1.0.29
 	github.com/chzyer/readline v1.5.1
 	github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568
@@ -29,6 +30,7 @@ require (
 	github.com/spf13/cobra v1.8.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.18.2
+	github.com/ssgreg/journald v1.0.0
 	github.com/stretchr/testify v1.8.4
 	go.etcd.io/bbolt v1.3.8
 	go.opentelemetry.io/otel v1.22.0

pkg/util/logger/logger.go

@@ -1,6 +1,10 @@
 package logger
 
 import (
+	"fmt"
+
+	"git.frostfs.info/TrueCloudLab/zapjournald"
+	"github.com/ssgreg/journald"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 )
@@ -35,8 +39,15 @@ type Prm struct {
 	SamplingHook func(e zapcore.Entry, sd zapcore.SamplingDecision)
 
 	// do not support runtime rereading
+	dest string
 }
 
+const (
+	DestinationUndefined = ""
+	DestinationStdout    = "stdout"
+	DestinationJournald  = "journald"
+)
+
 // SetLevelString sets the minimum logging level. Default is
 // "info".
 //
@@ -48,6 +59,16 @@ func (p *Prm) SetLevelString(s string) error {
 	return p.level.UnmarshalText([]byte(s))
 }
 
+func (p *Prm) SetDestination(d string) error {
+	if d != DestinationStdout && d != DestinationJournald {
+		return fmt.Errorf("invalid logger destination %s", d)
+	}
+	if p != nil {
+		p.dest = d
+	}
+	return nil
+}
+
 // Reload reloads configuration of a connected instance of the Logger.
 // Returns ErrLoggerNotConnected if no connection has been performed.
 // Returns any reconfiguration error from the Logger directly.
@@ -79,7 +100,17 @@ func NewLogger(prm *Prm) (*Logger, error) {
 	if prm == nil {
 		prm = defaultPrm()
 	}
+	switch prm.dest {
+	case DestinationUndefined, DestinationStdout:
+		return newConsoleLogger(prm)
+	case DestinationJournald:
+		return newJournaldLogger(prm)
+	default:
+		return nil, fmt.Errorf("unknown destination %s", prm.dest)
+	}
+}
 
+func newConsoleLogger(prm *Prm) (*Logger, error) {
 	lvl := zap.NewAtomicLevelAt(prm.level)
 
 	c := zap.NewProductionConfig()
@@ -103,6 +134,34 @@ func NewLogger(prm *Prm) (*Logger, error) {
 	return l, nil
 }
 
+func newJournaldLogger(prm *Prm) (*Logger, error) {
+	lvl := zap.NewAtomicLevelAt(prm.level)
+
+	c := zap.NewProductionConfig()
+	c.Level = lvl
+	c.Encoding = "console"
+	c.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	if prm.SamplingHook != nil {
+		c.Sampling.Hook = prm.SamplingHook
+	}
+
+	encoder := zapjournald.NewPartialEncoder(zapcore.NewConsoleEncoder(c.EncoderConfig), zapjournald.SyslogFields)
+
+	core := zapjournald.NewCore(zap.NewAtomicLevelAt(prm.level), encoder, &journald.Journal{}, zapjournald.SyslogFields)
+	coreWithContext := core.With([]zapcore.Field{
+		zapjournald.SyslogFacility(zapjournald.LogDaemon),
+		zapjournald.SyslogIdentifier(),
+		zapjournald.SyslogPid(),
+	})
+
+	lZap := zap.New(coreWithContext, zap.AddStacktrace(zap.NewAtomicLevelAt(zap.FatalLevel)))
+
+	l := &Logger{Logger: lZap, lvl: lvl}
+	prm._log = l
+
+	return l, nil
+}
+
 func (l *Logger) reload(prm Prm) error {
 	l.lvl.SetLevel(prm.level)
 	return nil