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Beego/logs/console.go

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// Copyright 2014 beego Author. All Rights Reserved.
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//
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// 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
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// 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.
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package logs
import (
"encoding/json"
"log"
"os"
"runtime"
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)
type Brush func(string) string
func NewBrush(color string) Brush {
pre := "\033["
reset := "\033[0m"
return func(text string) string {
return pre + color + "m" + text + reset
}
}
var colors = []Brush{
NewBrush("1;37"), // Emergency white
NewBrush("1;36"), // Alert cyan
NewBrush("1;35"), // Critical magenta
NewBrush("1;31"), // Error red
NewBrush("1;33"), // Warning yellow
NewBrush("1;32"), // Notice green
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NewBrush("1;34"), // Informational blue
NewBrush("1;34"), // Debug blue
}
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// ConsoleWriter implements LoggerInterface and writes messages to terminal.
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type ConsoleWriter struct {
lg *log.Logger
Level int `json:"level"`
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}
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// create ConsoleWriter returning as LoggerInterface.
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func NewConsole() LoggerInterface {
cw := new(ConsoleWriter)
cw.lg = log.New(os.Stdout, "", log.Ldate|log.Ltime)
cw.Level = LevelDebug
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return cw
}
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// init console logger.
// jsonconfig like '{"level":LevelTrace}'.
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func (c *ConsoleWriter) Init(jsonconfig string) error {
if len(jsonconfig) == 0 {
return nil
}
err := json.Unmarshal([]byte(jsonconfig), c)
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if err != nil {
return err
}
return nil
}
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// write message in console.
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func (c *ConsoleWriter) WriteMsg(msg string, level int) error {
if level > c.Level {
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return nil
}
if goos := runtime.GOOS; goos == "windows" {
c.lg.Println(msg)
} else {
c.lg.Println(colors[level](msg))
}
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return nil
}
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// implementing method. empty.
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func (c *ConsoleWriter) Destroy() {
}
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// implementing method. empty.
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func (c *ConsoleWriter) Flush() {
}
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func init() {
Register("console", NewConsole)
}