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链式操作

完整的方法列表可参考接口文档：httphttps://godocpkg.go.orgdev/github.com/gogf/gf/v2/os/glog

glog模块支持非常简便的链式操作方式，主要的链式操作方法如下：

Code Block
languagego
// 重定向日志输出接口
func To(writer io.Writer) *Logger
// 日志内容输出到目录
func Path(path string) *Logger
// 设置日志文件分类
func Cat(category string) *Logger
// 设置日志文件格式
func File(file string) *Logger
// 设置日志打印级别
func Level(level int) *Logger
// 设置日志打印级别(字符串)
func LevelStr(levelStr string) *Logger
// 设置文件回溯值
func Skip(skip int) *Logger
// 是否开启trace打印
func Stack(enabled bool) *Logger
// 开启trace打印并设定过滤trace的字符串
func StackWithFilter(filter string) *Logger
// 是否开启终端输出
func Stdout(enabled...bool) *Logger
// 是否输出日志头信息
func Header(enabled...bool) *Logger
// 输出日志调用行号信息
func Line(long...bool) *Logger
//
设置文件回溯值 func Skip(skip int) *Logger // 
异步输出日志
func Async(enabled...bool) *Logger
示例1, 基本使用
 Code Block
languagego
package main

import (

    "github.com/gogf/gf/os/glog"
    
	"context"

	"github.com/gogf/gf/v2/
os
frame/
gfile
g"

    
	"github.com/gogf/gf/v2/
frame
os/
g
gfile"
)

func main() {
	ctx 
   
:= context.TODO()
	path := "/tmp/glog-cat"

    glog
	g.Log().SetPath(path)

    glog
	g.Log().Stdout(false).Cat("cat1").Cat("cat2").
Println
Print(ctx, "test")

    
	list, err := gfile.ScanDir(path, "*", true)

    
	g.Dump(err)

    
	g.Dump(list)
}


执行后，输出结果为：
 Code Block
languagehtml
null
[
	"/tmp/glog-cat/cat1",
	"/tmp/glog-cat/cat1/cat2",
	"/tmp/glog-cat/cat1/cat2/2018-10-10.log",
]


示例2, 打印调用行号
 Code Block
languagego
package main

import (
	"context"

	"github.com/gogf/gf/
os
v2/frame/
glog
g"
)

func main() {
	ctx := context.TODO()
	
glog
g.Log().Line().
Println
Print(ctx, "this is the short file name with its line number")
	
glog
g.Log().Line(true).
Println
Print(ctx, "lone file name with line number")
}


执行后，终端输出结果为：
 Code Block
languagexml
2019-05-23 09:22:58.141 glog_line.go:8: this is the short file name with its line number
2019-05-23 09:22:58.142 /Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf/
geg
.example/os/glog/glog_line.go:9: lone file name with line number


示例3, 文件回溯Skip
有时我们通过一些模块封装了glog模块来打印日志，例如封装了一个commonlogger包通过commonlogger.PrintLogPrint来打印日志，这个时候打印出来的调用文件行号总是同一个位置，因为对于glog来讲，它的调用方即总是commonlogger.PrintLogPrint方法。这个时候，我们可以通过设置回溯值来跳过回溯的文件数，使用SetStackSkip或者链式方法Skip实现。
文件回溯值的设置同样也会影响Stack调用回溯打印结果。
 Code Block
languagego
package main

import (
	"context"

	"github.com/gogf/gf/v2/
os
frame/
glog
g"
)

func PrintLog(ctx context.Context, content string) {
	
glog
g.Log().Skip(1).Line().
Println
Print(ctx, "line number with skip:", content)
	
glog
g.Log().Line().
Println
Print(ctx, "line number without skip:", content)
}

func main() {
	ctx := context.TODO()
	PrintLog(ctx, "just test")
}


执行后，终端输出结果为：
 Code Block
languagehtml
2019-05-23 19:30:10.984 glog_line2.go:13: line number with skip: just test
2019-05-23 19:30:10.984 glog_line2.go:9: line number without skip: just test








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