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recovery.go
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recovery.go
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package ginsvr
import (
"bytes"
"fmt"
"os"
"runtime"
"github.com/inoth/toybox/component/logger"
"github.com/inoth/toybox/server/ginsvr/res"
"github.com/gin-gonic/gin"
)
var (
dunno = []byte("???")
centerDot = []byte("·")
dot = []byte(".")
slash = []byte("/")
)
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 := os.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()
}
func function(pc uintptr) []byte {
fn := runtime.FuncForPC(pc)
if fn == nil {
return dunno
}
name := []byte(fn.Name())
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.ReplaceAll(name, centerDot, dot)
return name
}
func source(lines [][]byte, n int) []byte {
n--
if n < 0 || n >= len(lines) {
return dunno
}
return bytes.TrimSpace(lines[n])
}
func Recovery() gin.HandlerFunc {
return func(c *gin.Context) {
defer func() {
if err := recover(); err != nil {
log := logger.New("Recovery", c.GetHeader("TraceId"))
stack := stack(3)
switch err := err.(type) {
case error:
log.Error(fmt.Sprintf("[Recovery:error] panic recovered:\n%s\n%s", err.Error(), string(stack)))
res.Failed(c, err.Error())
case string:
log.Error(fmt.Sprintf("[Recovery:string] panic recovered:\n%s\n%s", err, string(stack)))
res.Failed(c, err)
default:
log.Error(fmt.Sprintf("[Recovery:invalid] panic recovered:\n%s", string(stack)))
res.Failed(c, string(stack))
}
c.Abort()
}
}()
c.Next()
}
}