60 lines
1.1 KiB
Go
60 lines
1.1 KiB
Go
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package log
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import (
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"fmt"
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"io"
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"runtime"
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"time"
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)
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type StreamHandler struct {
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W io.Writer
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Fmt ByteFormatter
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}
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func (me StreamHandler) Handle(r Record) {
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r.Msg = r.Skip(1)
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me.W.Write(me.Fmt(r))
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}
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type ByteFormatter func(Record) []byte
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func LineFormatter(msg Record) []byte {
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names := msg.Names
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if true || len(names) == 0 {
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var pc [1]uintptr
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msg.Callers(1, pc[:])
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names = pcNames(pc[0], names)
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}
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ret := []byte(fmt.Sprintf(
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"%s %-5s %s: %s",
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time.Now().Format("2006-01-02T15:04:05-0700"),
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msg.Level.LogString(),
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names,
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msg.Text(),
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))
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if ret[len(ret)-1] != '\n' {
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ret = append(ret, '\n')
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}
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return ret
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}
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func pcNames(pc uintptr, names []string) []string {
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if pc == 0 {
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panic(pc)
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}
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funcName, file, line := func() (string, string, int) {
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if false {
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// This seems to result in one less allocation, but doesn't handle inlining?
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func_ := runtime.FuncForPC(pc)
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file, line := func_.FileLine(pc)
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return func_.Name(), file, line
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} else {
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f, _ := runtime.CallersFrames([]uintptr{pc}).Next()
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return f.Function, f.File, f.Line
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}
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}()
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_ = file
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return append(names, fmt.Sprintf("%s:%v", funcName, line))
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}
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