From 7dab6e0054d7ea9c7e325445b0bdde90571d4038 Mon Sep 17 00:00:00 2001
From: "marko.tikvic" <marko.tikvic@to-net.rs>
Date: Mon, 22 Apr 2019 14:45:23 +0200
Subject: [PATCH] call stack for error tracing

---
 main.go | 33 +++++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/main.go b/main.go
index 52ae753..230e51d 100644
--- a/main.go
+++ b/main.go
@@ -89,19 +89,32 @@ func (l *Logger) Print(format string, v ...interface{}) {
 	fmt.Printf("%s: %s\n", time.Now().Format(dateTimeFormat), msg)
 }
 
-// CallerFilenameAndLineNumber ...
-func CallerFilenameAndLineNumber() (string, int) {
-	_, path, line, _ := runtime.Caller(2)
-	file := filepath.Base(path)
-	return file, line
+const MaxStackDepth = 10000
+
+// CallStack
+func CallStack() (stack string) {
+	callers := make([]uintptr, MaxStackDepth) // min 1
+	stackDepth := runtime.Callers(2, callers)
+	frames := runtime.CallersFrames(callers)
+
+	for i := 0; i < stackDepth; i++ {
+		if i >= 2 { // skip runtime and startup
+			frame, next := frames.Next()
+			stack += fmt.Sprintf("[%s %d]\n", frame.File, frame.Line)
+			if !next {
+				break
+			}
+		}
+	}
+
+	return
 }
 
 // PrintTrace ...
 func (l *Logger) PrintTrace(format string, v ...interface{}) {
-	file, line := CallerFilenameAndLineNumber()
-
+	stack := CallStack()
 	msg := fmt.Sprintf(format, v...)
-	fmt.Printf("%s: %s %d: %s\n", time.Now().Format(dateTimeFormat), file, line, msg)
+	fmt.Printf("%s:\n%s\n%s\n", time.Now().Format(dateTimeFormat), stack, msg)
 }
 
 // Trace ...
@@ -113,10 +126,10 @@ func (l *Logger) Trace(format string, v ...interface{}) {
 	l.mu.Lock()
 	defer l.mu.Unlock()
 
-	file, line := CallerFilenameAndLineNumber()
+	stack := CallStack()
 
 	msg := fmt.Sprintf(format, v...)
-	s := fmt.Sprintf("%s: %s %d: %s\n", time.Now().Format(dateTimeFormat), file, line, msg)
+	s := fmt.Sprintf("%s:\n%s\n%s\n", time.Now().Format(dateTimeFormat), stack, msg)
 
 	if l.shouldSplit(len(s)) {
 		l.split()
-- 
1.8.1.2