feat(recycler): add error cecycler (#10)

internal/notice/announcer.go

@@ -41,7 +41,7 @@ func (a *Announcer) AddBot(b Bot) *Announcer {
 func Notice(r record.Record) {
 	for _, bot := range announcer.Bots {
 		if err := bot.notice(r); err != nil {
-			log.Error(err.Error())
+			log.Warn(err.Error())
 		}
 	}
 }

internal/qqwry/wry.go

@@ -18,7 +18,7 @@ func init() {
 		if os.IsNotExist(err) {
 			err := download()
 			if err != nil {
-				log.Error("Download qqwry.dat failed, caused by:%v, recommend to download it by yourself otherwise the `IpArea` will be null", err)
+				log.Warn("Download qqwry.dat failed, caused by:%v, recommend to download it by yourself otherwise the `IpArea` will be null", err)
 			}
 		}
 	} else if time.Until(info.ModTime()) > 5*24*time.Hour {
@@ -36,7 +36,7 @@ func GetQQWry() *qqwry.QQwry {
 		init := qqwry.DatData.InitDatFile()
 		if v, ok := init.(error); ok {
 			if v != nil {
-				log.Error("qqwry init failed")
+				log.Warn("qqwry init failed")
 				wry = nil
 			}
 		}

internal/recycler/recycler.go

@@ -0,0 +1,83 @@
+package recycler
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"runtime"
+
+	log "unknwon.dev/clog/v2"
+)
+
+var (
+	dunno     = []byte("???")
+	centerDot = []byte("·")
+	dot       = []byte(".")
+	slash     = []byte("/")
+)
+
+func Recycle(err interface{}) {
+	stack := string(stack(3))
+	log.Error("%v\r\n%v", err, stack)
+}
+
+// stack returns a nicely formatted 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
+}

internal/rule/rule.go

@@ -35,7 +35,7 @@ func (br BaseRule) Match(s string) (flag, flagGroup string, vars map[string]stri
 			return
 		} else {
 			if catcher, err := regexp.Compile(br.FlagFormat); err != nil {
-				log.Error("%s[rule:%s]", err, br.Name)
+				log.Warn("%s[rule:%s]", err, br.Name)
 				return
 			} else {
 				br.flagCatcher = catcher