import "github.com/cihub/seelog"

func LoggerFromConfigAsBytes
func LoggerFromConfigAsFile
func LoggerFromConfigAsString
func LoggerFromWriterWithMinLevel
func LoggerFromWriterWithMinLevelAndFormat
func LoggerFromCustomReceiver(check https://github.com/cihub/seelog/wiki/Custom-receivers)

<seelog type="asynctimer" asyncinterval="1000000" minlevel="debug" maxlevel="error">
    <outputs formatid="main">
        <!-- 仅实现将日志内容输出到终端 -->
        <console/>
    </outputs>
    <formats>
        <!-- 设置格式，输出UTC日期 UTC时间 - 缩写版大写日志级别 - 相对于应用程序运行目录的调用者路径 - 日志记录器被调用时的行号 - 消息文本（最后换行） -->
        <format id="main" format="%UTCDate %UTCTime - [%LEV] - %RelFile - l%Line - %Msg%n"/>
    </formats>
</seelog>

package main

import (
    log "github.com/cihub/seelog"
    "fmt"
)

func main() {
    logger, err := log.LoggerFromConfigAsFile("seelog.xml")
        
    if err != nil {
        fmt.Println("parse seelog.xml error")
    }
        
    log.ReplaceLogger(logger)

    defer log.Flush()
    log.Info("Hello from Seelog!")

}

userdeMBP:go-learning user$ go run test.go 
2019-03-04 09:19:11 - [INF] - test.go - l20 - Hello from Seelog!

import log "github.com/cihub/seelog"

func main() {
    logger, err := log.LoggerFromConfigAsFile("seelog.xml")
    if err != nil {
        panic(err)
    }
    defer logger.Flush()
    logger.Trace("test")
    logger.Debugf("var = %s", "abc")
}

import log "github.com/cihub/seelog"

func main() {
    logger, err := log.LoggerFromConfigAsFile("seelog.xml")
    if err != nil {
        panic(err)
    }
    log.ReplaceLogger(logger)
    defer log.Flush()
    log.Trace("test")
    log.Debugf("var = %s", "abc")
}

log.Current.Trace("test")
log.Current.Debugf("var = %s", "abc")

package main

import log "github.com/cihub/seelog"

func main() {
    defer log.Flush()
    log.Info("Hello from Seelog!") //这个使用的是默认的日志记录器

    consoleWriter, _ := log.NewConsoleWriter() //创建一个新的控制台写入器
    formatter, _ := log.NewFormatter("%Level %Msg %File%n") //等价于配置中的<format>声明格式
    root, _ := log.NewSplitDispatcher(formatter, []interface{}{consoleWriter}) //即等价于配置中的<output>,formatter是该分配器指定的格式，接收到的日志信息指定接收器为标准输出
    constraints, _ := log.NewMinMaxConstraints(log.TraceLvl, log.CriticalLvl) //使用指定的最小和最大级别创建一个新的minMaxConstraints对象结构，即specificConstraints，指明一个范围内的级别
    specificConstraints, _ := log.NewListConstraints([]log.LogLevel{log.InfoLvl, log.ErrorLvl})//一个个指明可用的级别，这里即只能使用info和error这两个级别
    ex, _ := log.NewLogLevelException("*", "*main.go", specificConstraints)
    exceptions := []*log.LogLevelException{ex} //生成一个*log.LogLevelException对象列表

    logger := log.NewAsyncLoopLogger(log.NewLoggerConfig(constraints, exceptions, root))//使用了这个函数就能够生成一个完整的seelog配置了
    log.ReplaceLogger(logger)

    //下面的内容使用的就是我们上面自定义的日志生成器了
    log.Trace("This should not be seen")
    log.Debug("This should not be seen")
    log.Info("Test")
    log.Error("Test2")
}

userdeMBP:go-learning user$ go run test.go 
1551754090234813000 [Info] Hello from Seelog!
Trace This should not be seen test.go
Debug This should not be seen test.go
Info Test test.go
Error Test2 test.go

func NewBufferedWriter(innerWriter io.Writer, bufferSize int, flushPeriod time.Duration) (*bufferedWriter, error)

func NewSMTPWriter(sa, sn string, ras []string, hn, hp, un, pwd string, cacdps []string, subj string, headers []string) *smtpWriter

    <recipient address="[email protected]"/>
    <recipient address="[email protected]"/>

<header name="Priority" value="Urgent" />
<header name="Importance" value="high" />

const (
    TraceLvl = iota //0
    DebugLvl         //1
    InfoLvl 
    WarnLvl
    ErrorLvl
    CriticalLvl
    Off                  //6
)

const (
    TraceStr    = "trace"
    DebugStr    = "debug"
    InfoStr     = "info"
    WarnStr     = "warn"
    ErrorStr    = "error"
    CriticalStr = "critical"
    OffStr      = "off"
)

const (
    DateDefaultFormat = "2006-01-02"
    TimeFormat        = "15:04:05"
)

const (
    FormatterSymbol = '%'
)

const (
    MaxQueueSize = 10000
)

const (
    // Default subject phrase for sending emails.
    DefaultSubjectPhrase = "Diagnostic message from server: "
)

var (
    DefaultFormatter *formatter
)
var DefaultMsgFormat = "%Ns [%Level] %Msg%n"

package main

import log "github.com/cihub/seelog"

func main() {
    testConfig := `
<seelog type="sync" minlevel="trace">
    <outputs><console/></outputs>
</seelog>`

    logger, _ := log.LoggerFromConfigAsBytes([]byte(testConfig))
    log.ReplaceLogger(logger)
    defer log.Flush()

    log.Trace("NOT Printed")
    log.Tracef("Returning %s", "NOT Printed")
    log.Debug("NOT Printed")
    log.Debugf("Returning %s", "NOT Printed")
    log.Info("Printed")
    log.Infof("Returning %s", "Printed")
    log.Warn("Printed")
    log.Warnf("Returning %s", "Printed")
    log.Error("Printed")
    log.Errorf("Returning %s", "Printed")
    log.Critical("Printed")
    log.Criticalf("Returning %s", "Printed")
}

userdeMBP:go-learning user$ go run test.go 
1551777220280758000 [Trace] NOT Printed
1551777220280819000 [Trace] Returning NOT Printed
1551777220280842000 [Debug] NOT Printed
1551777220280848000 [Debug] Returning NOT Printed
1551777220280853000 [Info] Printed
1551777220280858000 [Info] Returning Printed
1551777220280863000 [Warn] Printed
1551777220280871000 [Warn] Returning Printed
1551777220280876000 [Error] Printed
1551777220280885000 [Error] Returning Printed
1551777220280891000 [Critical] Printed
1551777220280896000 [Critical] Returning Printed

seelog.UseLogger(somelogger)

seelog.Debug("abc")

somelogger.Debug("abc")

package main

import log "github.com/cihub/seelog"

func main() {
    log.Info("Replace before Printed") //使用的是默认的格式
    testConfig := `
<seelog type="sync" minlevel="info">
    <outputs formatid="main"><console/></outputs>
    <formats>
        <format id="main" format="%UTCDate %UTCTime - [%LEV] - %RelFile - l%Line - %Msg%n"></format>
    </formats>
</seelog>`

    logger, _ := log.LoggerFromConfigAsBytes([]byte(testConfig)) 
    log.ReplaceLogger(logger) //替换后使用的就是上面新定义的格式了
    defer log.Flush()

    log.Info("Replace after Printed")
}

userdeMBP:go-learning user$ go run test.go 
1551777876234048000 [Info] Replace before Printed
2019-03-05 09:24:36 - [INF] - test.go - l20 - Replace after Printed

    <exceptions>
        <exception filepattern="test*" minlevel="error"/>
    </exceptions>

    <exceptions>
        <exception funcpattern="main.testFunc" minlevel="warn"/>
    </exceptions>

func (logLevelEx *LogLevelException) String() string