From e911f901a69030fff24facfa605a159196e065af Mon Sep 17 00:00:00 2001
From: Gyuho Lee <leegyuho@amazon.com>
Date: Sun, 28 Jul 2019 21:36:55 -0500
Subject: [PATCH] pkg/logutil: add log level utilities

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>
---
 pkg/logutil/log_level.go | 70 ++++++++++++++++++++++++++++++++++++++++
 pkg/logutil/zap.go       |  2 +-
 2 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100644 pkg/logutil/log_level.go

diff --git a/pkg/logutil/log_level.go b/pkg/logutil/log_level.go
new file mode 100644
index 000000000..d57e17394
--- /dev/null
+++ b/pkg/logutil/log_level.go
@@ -0,0 +1,70 @@
+// Copyright 2019 The etcd Authors
+//
+// 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.
+
+package logutil
+
+import (
+	"fmt"
+
+	"github.com/coreos/pkg/capnslog"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+var DefaultLogLevel = "info"
+
+// ConvertToZapLevel converts log level string to zapcore.Level.
+func ConvertToZapLevel(lvl string) zapcore.Level {
+	switch lvl {
+	case "debug":
+		return zap.DebugLevel
+	case "info":
+		return zap.InfoLevel
+	case "warn":
+		return zap.WarnLevel
+	case "error":
+		return zap.ErrorLevel
+	case "dpanic":
+		return zap.DPanicLevel
+	case "panic":
+		return zap.PanicLevel
+	case "fatal":
+		return zap.FatalLevel
+	default:
+		panic(fmt.Sprintf("unknown level %q", lvl))
+	}
+}
+
+// ConvertToCapnslogLogLevel convert log level string to capnslog.LogLevel.
+// TODO: deprecate this in 3.5
+func ConvertToCapnslogLogLevel(lvl string) capnslog.LogLevel {
+	switch lvl {
+	case "debug":
+		return capnslog.DEBUG
+	case "info":
+		return capnslog.INFO
+	case "warn":
+		return capnslog.WARNING
+	case "error":
+		return capnslog.ERROR
+	case "dpanic":
+		return capnslog.CRITICAL
+	case "panic":
+		return capnslog.CRITICAL
+	case "fatal":
+		return capnslog.CRITICAL
+	default:
+		panic(fmt.Sprintf("unknown level %q", lvl))
+	}
+}
diff --git a/pkg/logutil/zap.go b/pkg/logutil/zap.go
index 313d914c1..2f692233a 100644
--- a/pkg/logutil/zap.go
+++ b/pkg/logutil/zap.go
@@ -23,7 +23,7 @@ import (
 
 // DefaultZapLoggerConfig defines default zap logger configuration.
 var DefaultZapLoggerConfig = zap.Config{
-	Level: zap.NewAtomicLevelAt(zap.InfoLevel),
+	Level: zap.NewAtomicLevelAt(ConvertToZapLevel(DefaultLogLevel)),
 
 	Development: false,
 	Sampling: &zap.SamplingConfig{