dev: improve log position

log.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"runtime"
 	"runtime/debug"
 	"strings"
 	"sync"
@@ -101,7 +102,6 @@ func (log *Logger) SetLogLevelByName(newlv string) (oldlv string) {
 	return ErrLogLevel
 }
 
-
 func (log *Logger) Print(prefix string, v interface{}) {
 	var str = ""
 	if pkg, err := json.Marshal(v); err != nil {
@@ -168,7 +168,6 @@ func (log *Logger) Println(v ...interface{}){
 	log.logwrite(DEBUG, 3, "%s", fmt.Sprintln(v...))
 }
 
-
 func (log *Logger) GetLogidStr(format string) string {
 	if logidCreator != nil {
 		return fmt.Sprintf(format, logidCreator.GetLogid())
@@ -183,7 +182,7 @@ func (log *Logger) logwrite(typ LogLevel, calldepth int, format string, v ...int
 
 	var (
 		idstr  = log.GetLogidStr("[%s]")
-        prestr = idstr // + "[" + log.module + "] "
+		prestr = formatHeader(calldepth) + "" + idstr + "$ "
 	)
 
 	format = strings.Trim(format, "\n")
@@ -227,6 +226,93 @@ func (log *Logger) logwrite(typ LogLevel, calldepth int, format string, v ...int
 	}
 }
 
+func formatHeader(calldepth int) string {
+	const MAX_LENGTH = 35 /* + 22 */
+	// log time
+	now := time.Now()
+	year, month, day := now.Date()
+	hour, min, sec := now.Clock()
+	nowstr := fmt.Sprintf("%4d%02d%02dT%02d:%02d:%02d.%03d ",
+		year, month, day, hour, min, sec, now.Nanosecond()/1e6)
+
+	// log position
+	_, file, line, ok := runtime.Caller(calldepth + 1)
+	if !ok {
+		file = "???"
+		line = 0
+	}
+
+	// Case 1: too short path, return directly
+	i, header, linestr := 0, "", fmt.Sprintf("%d", line)
+	if len(file)+len(linestr) < MAX_LENGTH {
+		header = file + ":" + linestr
+		return nowstr + header
+	}
+
+	// Case 2: filename long enough, just return filename
+	for i = len(file) - 1; i >= 0; i-- {
+		if file[i] == '/' {
+			header = file[i:] + ":" + linestr
+			i--
+			break
+		}
+	}
+	if len(header) >= MAX_LENGTH && i > 0 {
+		header = "…" + header[:4] + "…" + header[len(header)-MAX_LENGTH+6:]
+		return nowstr + header
+	} else if len(header) >= MAX_LENGTH && i <= 0 {
+		header = header[:4] + "…" + header[len(header)-MAX_LENGTH+5:]
+		return nowstr + header
+	}
+
+	// Case 3: try complex middle path with 'width=6'
+	tempheader := formatHeaderPath(file, i, 6) + header
+	if len(tempheader) > MAX_LENGTH {
+		tempheader = "…" + tempheader[len(tempheader)-MAX_LENGTH+1:]
+		return nowstr + tempheader
+	}
+
+	// Case 4: try complex middle path with 'width=8'
+	tempheader = formatHeaderPath(file, i, 8) + header
+	if len(tempheader) > MAX_LENGTH {
+		tempheader = "…" + tempheader[len(tempheader)-MAX_LENGTH+1:]
+		return nowstr + tempheader
+	}
+
+	// Case 5: try complex middle path with 'width=10'
+	tempheader = formatHeaderPath(file, i, 10) + header
+	if len(tempheader) > MAX_LENGTH {
+		tempheader = "…" + tempheader[len(tempheader)-MAX_LENGTH+1:]
+		return nowstr + tempheader
+	}
+
+	// Case 6: fallback
+	return nowstr + tempheader
+}
+
+func formatHeaderPath(file string, i, width int) (paths string) {
+	ii, iw := i, i
+	for i := ii; i >= 0; i-- {
+		if file[i] == '/' {
+			if iw-i > width {
+				// dirname lenght more then width
+				paths = file[i:i+width] + "." + paths
+			} else {
+				// dirname lenght less then width
+				paths = file[i:iw+1] + paths
+			}
+			//fmt.Println("w", iw-i, "width", width, "paths", paths)
+			if width > 2 {
+				// decrease width
+				width--
+			}
+			iw = i - 1
+			continue
+		}
+	}
+	return paths
+}
+
 func needWriteLogToFile() bool {
 	if cls, ok := os.LookupEnv("QOOLOG_CLOSE_FILELOG"); ok && cls != "N" && cls != "n" {
 		return false
@@ -262,7 +348,7 @@ func initlog() {
 		logDirsOptional = []string{"./log", "/var/log"}
 		logSplitTag     = "20060102" //20060102150405
 		baseWriter      = NewBaseWriter(nil, os.Stdout, nil)
-        gologFlags      = log.Ldate | log.Lmicroseconds | log.Lshortfile
+		gologFlags      = 0 /* log.Ldate | log.Lmicroseconds | log.Lshortfile */
 	)
 
 	// Step 2.1 add stdout to base writer if need