From 9c2ad91230d72fe6d661450cc78300ea223ae2bc Mon Sep 17 00:00:00 2001
From: Vidhu Kant Sharma <bokuwakanojogahoshii@yahoo.com>
Date: Mon, 19 Oct 2020 11:05:36 +0530
Subject: make it better

---
 vendor/github.com/gin-gonic/gin/recovery.go | 106 ++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 vendor/github.com/gin-gonic/gin/recovery.go

(limited to 'vendor/github.com/gin-gonic/gin/recovery.go')

diff --git a/vendor/github.com/gin-gonic/gin/recovery.go b/vendor/github.com/gin-gonic/gin/recovery.go
new file mode 100644
index 0000000..e296e33
--- /dev/null
+++ b/vendor/github.com/gin-gonic/gin/recovery.go
@@ -0,0 +1,106 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"runtime"
+)
+
+var (
+	dunno     = []byte("???")
+	centerDot = []byte("·")
+	dot       = []byte(".")
+	slash     = []byte("/")
+)
+
+// Recovery returns a middleware that recovers from any panics and writes a 500 if there was one.
+func Recovery() HandlerFunc {
+	return RecoveryWithWriter(DefaultWriter)
+}
+
+func RecoveryWithWriter(out io.Writer) HandlerFunc {
+	var logger *log.Logger
+	if out != nil {
+		logger = log.New(out, "", log.LstdFlags)
+	}
+	return func(c *Context) {
+		defer func() {
+			if err := recover(); err != nil {
+				if logger != nil {
+					stack := stack(3)
+					logger.Printf("Panic recovery -> %s\n%s\n", err, stack)
+				}
+				c.AbortWithStatus(500)
+			}
+		}()
+		c.Next()
+	}
+}
+
+// stack returns a nicely formated stack frame, skipping skip frames
+func stack(skip int) []byte {
+	buf := new(bytes.Buffer) // the returned data
+	// As we loop, we open files and read them. These variables record the currently
+	// loaded file.
+	var lines [][]byte
+	var lastFile string
+	for i := skip; ; i++ { // Skip the expected number of frames
+		pc, file, line, ok := runtime.Caller(i)
+		if !ok {
+			break
+		}
+		// Print this much at least.  If we can't find the source, it won't show.
+		fmt.Fprintf(buf, "%s:%d (0x%x)\n", file, line, pc)
+		if file != lastFile {
+			data, err := ioutil.ReadFile(file)
+			if err != nil {
+				continue
+			}
+			lines = bytes.Split(data, []byte{'\n'})
+			lastFile = file
+		}
+		fmt.Fprintf(buf, "\t%s: %s\n", function(pc), source(lines, line))
+	}
+	return buf.Bytes()
+}
+
+// source returns a space-trimmed slice of the n'th line.
+func source(lines [][]byte, n int) []byte {
+	n-- // in stack trace, lines are 1-indexed but our array is 0-indexed
+	if n < 0 || n >= len(lines) {
+		return dunno
+	}
+	return bytes.TrimSpace(lines[n])
+}
+
+// function returns, if possible, the name of the function containing the PC.
+func function(pc uintptr) []byte {
+	fn := runtime.FuncForPC(pc)
+	if fn == nil {
+		return dunno
+	}
+	name := []byte(fn.Name())
+	// The name includes the path name to the package, which is unnecessary
+	// since the file name is already included.  Plus, it has center dots.
+	// That is, we see
+	//	runtime/debug.*T·ptrmethod
+	// and want
+	//	*T.ptrmethod
+	// Also the package path might contains dot (e.g. code.google.com/...),
+	// so first eliminate the path prefix
+	if lastslash := bytes.LastIndex(name, slash); lastslash >= 0 {
+		name = name[lastslash+1:]
+	}
+	if period := bytes.Index(name, dot); period >= 0 {
+		name = name[period+1:]
+	}
+	name = bytes.Replace(name, centerDot, dot, -1)
+	return name
+}
-- 
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