per module log levels (Refs #493)

cmd/tendermint/commands/flags/log_level.go

@@ -0,0 +1,85 @@
+package flags
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	cfg "github.com/tendermint/tendermint/config"
+	"github.com/tendermint/tmlibs/log"
+)
+
+const (
+	defaultLogLevelKey = "*"
+)
+
+// IsLogLevelSimple returns true if log level is a single word ("info", ...).
+func IsLogLevelSimple(l string) bool {
+	return !strings.Contains(l, ":")
+}
+
+// ParseComplexLogLevel parses complex log level - comma-separated
+// list of module:level pairs with an optional *:level pair (* means
+// all other modules).
+//
+// Example:
+//		ParseComplexLogLevel("consensus:debug,mempool:debug,*:error", log.NewTMLogger(os.Stdout))
+func ParseComplexLogLevel(l string, logger log.Logger) (log.Logger, error) {
+	if l == "" {
+		return nil, errors.New("Empty log level")
+	}
+
+	options := make([]log.Option, 0)
+
+	isDefaultLogLevelSet := false
+	var option log.Option
+	var err error
+
+	list := strings.Split(l, ",")
+	for _, item := range list {
+		moduleAndLevel := strings.Split(item, ":")
+
+		if len(moduleAndLevel) != 2 {
+			return nil, fmt.Errorf("Expected list in a form of \"module:level\" pairs, given pair %s, list %s", item, list)
+		}
+
+		module := moduleAndLevel[0]
+		level := moduleAndLevel[1]
+
+		if module == defaultLogLevelKey {
+			option, err = log.AllowLevel(level)
+			if err != nil {
+				return nil, errors.Wrap(err, fmt.Sprintf("Failed to parse default log level (pair %s, list %s)", item, l))
+			}
+			options = append(options, option)
+			isDefaultLogLevelSet = true
+		} else {
+			switch level {
+			case "debug":
+				option = log.AllowDebugWith("module", module)
+			case "info":
+				option = log.AllowInfoWith("module", module)
+			case "error":
+				option = log.AllowErrorWith("module", module)
+			case "none":
+				option = log.AllowNoneWith("module", module)
+			default:
+				return nil, fmt.Errorf("Expected either \"info\", \"debug\", \"error\" or \"none\" log level, given %s (pair %s, list %s)", level, item, list)
+			}
+			options = append(options, option)
+
+		}
+	}
+
+	// if "*" is not provided, set default global level
+	if !isDefaultLogLevelSet {
+		option, err = log.AllowLevel(cfg.DefaultBaseConfig().LogLevel)
+		if err != nil {
+			return nil, err
+		}
+		options = append(options, option)
+	}
+
+	return log.NewFilter(logger, options...), nil
+}

cmd/tendermint/commands/flags/log_level_test.go

@@ -0,0 +1,42 @@
+package flags_test
+
+import (
+	"testing"
+
+	tmflags "github.com/tendermint/tendermint/cmd/tendermint/commands/flags"
+	"github.com/tendermint/tmlibs/log"
+)
+
+func TestIsLogLevelSimple(t *testing.T) {
+	simpleFlags := []string{"info", "debug", "some"}
+	for _, f := range simpleFlags {
+		if !tmflags.IsLogLevelSimple(f) {
+			t.Fatalf("%s is a simple flag", f)
+		}
+	}
+
+	complexFlags := []string{"mempool:error", "mempool:error,*:debug"}
+	for _, f := range complexFlags {
+		if tmflags.IsLogLevelSimple(f) {
+			t.Fatalf("%s is a complex flag", f)
+		}
+	}
+}
+
+func TestParseComplexLogLevel(t *testing.T) {
+	logger := log.TestingLogger()
+
+	correctLogLevels := []string{"mempool:error", "mempool:error,*:debug", "*:debug,wire:none"}
+	for _, lvl := range correctLogLevels {
+		if _, err := tmflags.ParseComplexLogLevel(lvl, logger); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	incorrectLogLevel := []string{"some", "mempool:some", "*:some,mempool:error"}
+	for _, lvl := range incorrectLogLevel {
+		if _, err := tmflags.ParseComplexLogLevel(lvl, logger); err == nil {
+			t.Fatalf("Expected %s to produce error", lvl)
+		}
+	}
+}

cmd/tendermint/commands/root.go

@@ -1,11 +1,13 @@
 package commands
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 
+	tmflags "github.com/tendermint/tendermint/cmd/tendermint/commands/flags"
 	cfg "github.com/tendermint/tendermint/config"
 	"github.com/tendermint/tmlibs/log"
 )
@@ -26,9 +28,21 @@ var RootCmd = &cobra.Command{
 		err := viper.Unmarshal(config)
 		config.SetRoot(config.RootDir)
 		cfg.EnsureRoot(config.RootDir)
-		logger, err = log.NewFilterByLevel(logger, config.LogLevel)
-		if err != nil {
-			return err
+		if tmflags.IsLogLevelSimple(config.LogLevel) {
+			var option log.Option
+			switch config.LogLevel {
+			case "info":
+				option = log.AllowInfo()
+			case "debug":
+				option = log.AllowDebug()
+			case "error":
+				option = log.AllowError()
+			case "none":
+				option = log.AllowNone()
+			default:
+				return fmt.Errorf("Expected log level to be either \"info\", \"debug\", \"error\" or \"none\", given %s", config.LogLevel)
+			}
+			logger = log.NewFilter(logger, option)
 		}
 		return err
 	},

cmd/tendermint/commands/run_node.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/spf13/cobra"
 
+	tmflags "github.com/tendermint/tendermint/cmd/tendermint/commands/flags"
 	"github.com/tendermint/tendermint/node"
 	"github.com/tendermint/tendermint/types"
 	cmn "github.com/tendermint/tmlibs/common"
@@ -79,6 +80,14 @@ func runNode(cmd *cobra.Command, args []string) error {
 		}
 	}
 
+	if !tmflags.IsLogLevelSimple(config.LogLevel) {
+		var err error
+		logger, err = tmflags.ParseComplexLogLevel(config.LogLevel, logger)
+		if err != nil {
+			return err
+		}
+	}
+
 	// Create & start node
 	n := node.NewNodeDefault(config, logger.With("module", "node"))
 	if _, err := n.Start(); err != nil {