statsd_exporter/pkg/level/level.go

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// Copyright 2021 The Prometheus 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 level
import (
"fmt"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
)
var logLevel = LevelInfo
// A Level is a logging priority. Higher levels are more important.
type Level int
const (
// LevelDebug logs are typically voluminous, and are usually disabled in
// production.
LevelDebug Level = iota
// LevelInfo is the default logging priority.
LevelInfo
// LevelWarn logs are more important than Info, but don't need individual
// human review.
LevelWarn
// LevelError logs are high-priority. If an application is running smoothly,
// it shouldn't generate any error-level logs.
LevelError
)
var emptyLogger = &EmptyLogger{}
type EmptyLogger struct{}
func (l *EmptyLogger) Log(keyvals ...interface{}) error {
return nil
}
// SetLogLevel sets the log level.
func SetLogLevel(level string) error {
switch level {
case "debug":
logLevel = LevelDebug
case "info":
logLevel = LevelInfo
case "warn":
logLevel = LevelWarn
case "error":
logLevel = LevelError
default:
return fmt.Errorf("unrecognized log level %s", level)
}
return nil
}
// Error returns a logger that includes a Key/ErrorValue pair.
func Error(logger log.Logger) log.Logger {
if logLevel <= LevelError {
return level.Error(logger)
}
return emptyLogger
}
// Warn returns a logger that includes a Key/WarnValue pair.
func Warn(logger log.Logger) log.Logger {
if logLevel <= LevelWarn {
return level.Warn(logger)
}
return emptyLogger
}
// Info returns a logger that includes a Key/InfoValue pair.
func Info(logger log.Logger) log.Logger {
if logLevel <= LevelInfo {
return level.Info(logger)
}
return emptyLogger
}
// Debug returns a logger that includes a Key/DebugValue pair.
func Debug(logger log.Logger) log.Logger {
if logLevel <= LevelDebug {
return level.Debug(logger)
}
return emptyLogger
}