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jfa-go/log.go

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package main
import (
"io"
"log"
"os"
"path/filepath"
"regexp"
"github.com/gin-gonic/gin"
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"github.com/aleksasiriski/jfa-go/linecache"
)
var logPath string = filepath.Join(temp, "jfa-go.log")
var lineCache = linecache.NewLineCache(100)
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func logOutput() (closeFunc func(), err error) {
old := os.Stdout
writers := []io.Writer{old, colorStripper{lineCache}}
wExit := make(chan bool)
r, w, _ := os.Pipe()
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var f *os.File
if TRAY {
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log.Printf("Logging to \"%s\"", logPath)
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f, err = os.OpenFile(logPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
if err != nil {
closeFunc = func() {}
return
}
writers = append(writers, colorStripper{f})
closeFunc = func() {
w.Close()
<-wExit
f.Close()
}
} else {
closeFunc = func() {
w.Close()
<-wExit
}
}
writer := io.MultiWriter(writers...)
// FIXME: Potential cause if last log line doesn't get printed sometimes.
os.Stdout, os.Stderr = w, w
log.SetOutput(writer)
gin.DefaultWriter, gin.DefaultErrorWriter = writer, writer
go func() {
io.Copy(writer, r)
wExit <- true
}()
return
}
// Regex that removes ANSI color escape sequences. Used for outputting to log file and log cache.
var stripColors = func() *regexp.Regexp {
r, err := regexp.Compile("\\x1b\\[[0-9;]*m")
if err != nil {
log.Fatalf("Failed to compile color escape regexp: %v", err)
}
return r
}()
type colorStripper struct {
file io.Writer
}
func (c colorStripper) Write(p []byte) (n int, err error) {
_, err = c.file.Write(stripColors.ReplaceAll(p, []byte("")))
n = len(p)
return
}
func sanitizeLog(l string) string {
quoteCensor, err := regexp.Compile("\"([^\"]*)\"")
if err != nil {
log.Fatalf("Failed to compile sanitizing regexp: %v", err)
}
return string(quoteCensor.ReplaceAll([]byte(l), []byte("\"CENSORED\"")))
}