github.com/eframework-cn/EP.GO.UTIL@v1.0.0/xlog/console.go (about)

     1  // Copyright 2014 beego Author. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package xlog
    16  
    17  import (
    18  	"encoding/json"
    19  	"os"
    20  	"strings"
    21  	"time"
    22  
    23  	"github.com/shiena/ansicolor"
    24  )
    25  
    26  // brush is a color join function
    27  type brush func(string) string
    28  
    29  // newBrush return a fix color Brush
    30  func newBrush(color string) brush {
    31  	pre := "\033["
    32  	reset := "\033[0m"
    33  	return func(text string) string {
    34  		return pre + color + "m" + text + reset
    35  	}
    36  }
    37  
    38  var colors = []brush{
    39  	newBrush("1;37"), // Emergency          white
    40  	newBrush("1;36"), // Alert              cyan
    41  	newBrush("1;35"), // Critical           magenta
    42  	newBrush("1;31"), // Error              red
    43  	newBrush("1;33"), // Warning            yellow
    44  	newBrush("1;32"), // Notice             green
    45  	newBrush("1;34"), // Informational      blue
    46  	newBrush("1;44"), // Debug              Background blue
    47  }
    48  
    49  // consoleWriter implements LoggerInterface and writes messages to terminal.
    50  type consoleWriter struct {
    51  	lg       *logWriter
    52  	Level    int  `json:"level"`
    53  	Colorful bool `json:"color"` //this filed is useful only when system's terminal supports color
    54  }
    55  
    56  // NewConsole create ConsoleWriter returning as LoggerInterface.
    57  func NewConsole() Logger {
    58  	cw := &consoleWriter{
    59  		lg:       newLogWriter(ansicolor.NewAnsiColorWriter(os.Stdout)),
    60  		Level:    LevelDebug,
    61  		Colorful: true,
    62  	}
    63  	return cw
    64  }
    65  
    66  // Init init console logger.
    67  // jsonConfig like '{"level":LevelTrace}'.
    68  func (c *consoleWriter) Init(jsonConfig string) error {
    69  	if len(jsonConfig) == 0 {
    70  		return nil
    71  	}
    72  	return json.Unmarshal([]byte(jsonConfig), c)
    73  }
    74  
    75  // WriteMsg write message in console.
    76  func (c *consoleWriter) WriteMsg(when time.Time, msg string, level int) error {
    77  	if level > c.Level {
    78  		return nil
    79  	}
    80  	if c.Colorful {
    81  		msg = strings.Replace(msg, levelPrefix[level], colors[level](levelPrefix[level]), 1)
    82  	}
    83  	c.lg.writeln(when, msg)
    84  	return nil
    85  }
    86  
    87  // Destroy implementing method. empty.
    88  func (c *consoleWriter) Destroy() {
    89  
    90  }
    91  
    92  // Flush implementing method. empty.
    93  func (c *consoleWriter) Flush() {
    94  
    95  }
    96  
    97  func init() {
    98  	Register(AdapterConsole, NewConsole)
    99  }