105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
// Copyright (c) 2014-2018, b3log.org & hacpai.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"runtime"
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"github.com/b3log/wide/log"
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)
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// Logger.
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var logger = log.NewLogger(os.Stdout)
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var (
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dunno = []byte("???")
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centerDot = []byte("·")
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dot = []byte(".")
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slash = []byte("/")
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)
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// Recover recovers a panic.
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func Recover() {
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if re := recover(); nil != re {
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stack := stack()
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logger.Errorf("PANIC RECOVERED: %v\n\t%s\n", re, stack)
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}
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}
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// stack implements Stack, skipping 2 frames.
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func stack() []byte {
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buf := &bytes.Buffer{} // the returned data
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// As we loop, we open files and read them. These variables record the currently
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// loaded file.
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var lines [][]byte
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var lastFile string
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for i := 2; ; i++ { // Caller we care about is the user, 2 frames up
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pc, file, line, ok := runtime.Caller(i)
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if !ok {
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break
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}
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// Print this much at least. If we can't find the source, it won't show.
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fmt.Fprintf(buf, "%s:%d (0x%x)\n", file, line, pc)
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if file != lastFile {
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data, err := ioutil.ReadFile(file)
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if err != nil {
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continue
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}
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lines = bytes.Split(data, []byte{'\n'})
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lastFile = file
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}
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line-- // in stack trace, lines are 1-indexed but our array is 0-indexed
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fmt.Fprintf(buf, "\t%s: %s\n", function(pc), source(lines, line))
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}
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return buf.Bytes()
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}
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// source returns a space-trimmed slice of the n'th line.
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func source(lines [][]byte, n int) []byte {
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if n < 0 || n >= len(lines) {
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return dunno
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}
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return bytes.Trim(lines[n], " \t")
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}
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// function returns, if possible, the name of the function containing the PC.
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func function(pc uintptr) []byte {
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fn := runtime.FuncForPC(pc)
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if fn == nil {
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return dunno
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}
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name := []byte(fn.Name())
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// The name includes the path name to the package, which is unnecessary
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// since the file name is already included. Plus, it has center dots.
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// That is, we see
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// runtime/debug.*T·ptrmethod
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// and want
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// *T.ptrmethod
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// Since the package path might contains dots (e.g. code.google.com/...),
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// we first remove the path prefix if there is one.
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if lastslash := bytes.LastIndex(name, slash); lastslash >= 0 {
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name = name[lastslash+1:]
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}
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if period := bytes.Index(name, dot); period >= 0 {
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name = name[period+1:]
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}
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name = bytes.Replace(name, centerDot, dot, -1)
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return name
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}
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