Capture glog output and redirect to standard logging service

deps/github.com/golang/glog/glog_redirect.go

@@ -0,0 +1,89 @@
+//
+// DISCLAIMER
+//
+// Copyright 2018 ArangoDB GmbH, Cologne, Germany
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+// Author Ewout Prangsma
+//
+
+//
+// Note: This code is added to the standard glog package.
+//       It has to be here because it needs package level
+//       access to some members.
+//       Do not remove this when updating the vendored glog package!
+//
+
+package glog
+
+import "strings"
+
+type LogLevel int
+
+const (
+	// Make sure these constants end up having the same indexes as the severity constants
+	LogLevelInfo LogLevel = iota
+	LogLevelWarning
+	LogLevelError
+	LogLevelFatal
+)
+
+// redirectWriter wraps a callback that is called when data is written to it.
+type redirectWriter struct {
+	cb    func(level LogLevel, message string)
+	level LogLevel
+}
+
+func (w *redirectWriter) Flush() error {
+	return nil
+}
+
+func (w *redirectWriter) Sync() error {
+	return nil
+}
+
+func (w *redirectWriter) Write(p []byte) (n int, err error) {
+	msg := string(p)
+	if msg[len(msg)-1] == '\n' {
+		msg = msg[:len(msg)-1]
+	}
+	if idx := strings.IndexByte(msg, ']'); idx > 0 {
+		msg = strings.TrimSpace(msg[idx+1:])
+	}
+	w.cb(w.level, msg)
+	return len(p), nil
+}
+
+// RedirectOutput redirects output of the given logging to the given callback.
+func (l *loggingT) RedirectOutput(cb func(level LogLevel, message string)) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+
+	l.toStderr = false
+	l.alsoToStderr = false
+	for i := range logging.file {
+		logging.file[i] = &redirectWriter{
+			cb:    cb,
+			level: LogLevel(i),
+		}
+	}
+	return
+}
+
+// RedirectOutput redirects output of thestandard logging to the given callback.
+func RedirectOutput(cb func(level LogLevel, message string)) {
+	logging.RedirectOutput(cb)
+}

main.go

@@ -29,6 +29,7 @@ import (
 	"net/http"
 	"os"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/pkg/errors"
@@ -116,12 +117,25 @@ func cmdUsage(cmd *cobra.Command, args []string) {
 
 // Run the operator
 func cmdMainRun(cmd *cobra.Command, args []string) {
+	// Get environment
+	namespace := os.Getenv(constants.EnvOperatorPodNamespace)
+	name := os.Getenv(constants.EnvOperatorPodName)
+	ip := os.Getenv(constants.EnvOperatorPodIP)
+
+	// Prepare log service
 	goflag.CommandLine.Parse([]string{"-logtostderr"})
 	var err error
 	logService, err = logging.NewService(logLevel)
 	if err != nil {
 		cliLog.Fatal().Err(err).Msg("Failed to initialize log service")
 	}
+	logService.ConfigureRootLogger(func(log zerolog.Logger) zerolog.Logger {
+		podNameParts := strings.Split(name, "-")
+		operatorID := podNameParts[len(podNameParts)-1]
+		cliLog = cliLog.With().Str("operator-id", operatorID).Logger()
+		return log.With().Str("operator-id", operatorID).Logger()
+	})
+	logService.CaptureGLog(logService.MustGetLogger("glog"))
 
 	// Check operating mode
 	if !operatorOptions.enableDeployment && !operatorOptions.enableDeploymentReplication && !operatorOptions.enableStorage {
@@ -129,18 +143,18 @@ func cmdMainRun(cmd *cobra.Command, args []string) {
 	}
 
 	// Log version
-	cliLog.Info().Msgf("Starting arangodb-operator, version %s build %s", projectVersion, projectBuild)
+	cliLog.Info().
+		Str("pod-name", name).
+		Str("pod-namespace", namespace).
+		Msgf("Starting arangodb-operator, version %s build %s", projectVersion, projectBuild)
 
-	// Get environment
-	namespace := os.Getenv(constants.EnvOperatorPodNamespace)
+	// Check environment
 	if len(namespace) == 0 {
 		cliLog.Fatal().Msgf("%s environment variable missing", constants.EnvOperatorPodNamespace)
 	}
-	name := os.Getenv(constants.EnvOperatorPodName)
 	if len(name) == 0 {
 		cliLog.Fatal().Msgf("%s environment variable missing", constants.EnvOperatorPodName)
 	}
-	ip := os.Getenv(constants.EnvOperatorPodIP)
 	if len(ip) == 0 {
 		cliLog.Fatal().Msgf("%s environment variable missing", constants.EnvOperatorPodIP)
 	}

pkg/logging/logger.go

@@ -28,6 +28,7 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/golang/glog"
 	"github.com/rs/zerolog"
 )
 
@@ -47,6 +48,10 @@ type Service interface {
 	MustGetLogger(name string) zerolog.Logger
 	// MustSetLevel sets the log level for the component with given name to given level.
 	MustSetLevel(name, level string)
+	// ConfigureRootLogger calls the given callback to modify the root logger.
+	ConfigureRootLogger(cb func(rootLog zerolog.Logger) zerolog.Logger)
+	// CaptureGLog configures glog to write to the given logger
+	CaptureGLog(log zerolog.Logger)
 }
 
 // loggingService implements Service
@@ -83,6 +88,32 @@ func NewService(defaultLevel string) (Service, error) {
 	return s, nil
 }
 
+// ConfigureRootLogger calls the given callback to modify the root logger.
+func (s *loggingService) ConfigureRootLogger(cb func(rootLog zerolog.Logger) zerolog.Logger) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	s.rootLog = cb(s.rootLog)
+}
+
+// CaptureGLog configures glog to write to the given logger
+func (s *loggingService) CaptureGLog(log zerolog.Logger) {
+	glog.RedirectOutput(func(level glog.LogLevel, msg string) {
+		var e *zerolog.Event
+		switch level {
+		case glog.LogLevelWarning:
+			e = log.WithLevel(zerolog.WarnLevel)
+		case glog.LogLevelError:
+			e = log.WithLevel(zerolog.ErrorLevel)
+		case glog.LogLevelFatal:
+			e = log.WithLevel(zerolog.FatalLevel)
+		default:
+			e = log.WithLevel(zerolog.InfoLevel)
+		}
+		e.Msg(msg)
+	})
+}
+
 // MustGetLogger creates a logger with given name
 func (s *loggingService) MustGetLogger(name string) zerolog.Logger {
 	s.mutex.Lock()