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level.go
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level.go
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// Copyright 2015 The LUCI 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 logging
import (
"context"
"errors"
"flag"
)
// Level is an enumeration consisting of supported log levels.
type Level int
// Level implements flag.Value.
var _ flag.Value = (*Level)(nil)
// Defined log levels.
const (
Debug Level = iota
Info
Warning
Error
)
// DefaultLevel is the default Level value.
const DefaultLevel = Info
// Set implements flag.Value.
func (l *Level) Set(v string) error {
switch v {
case "debug":
*l = Debug
case "info":
*l = Info
case "warning":
*l = Warning
case "error":
*l = Error
default:
return errors.New("unknown log level value")
}
return nil
}
// String implements flag.Value.
func (l Level) String() string {
switch l {
case Debug:
return "debug"
case Info:
return "info"
case Warning:
return "warning"
case Error:
return "error"
default:
return "unknown"
}
}
// SetLevel returns a new context with the given logging level.
//
// It can be retrieved with GetLevel(context).
func SetLevel(c context.Context, l Level) context.Context {
return context.WithValue(c, levelKey, l)
}
// GetLevel returns the Level for this context. It will return DefaultLevel if
// none is defined.
func GetLevel(c context.Context) Level {
if l, ok := c.Value(levelKey).(Level); ok {
return l
}
return DefaultLevel
}