/
parse_panic.go
137 lines (114 loc) · 3.19 KB
/
parse_panic.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
package errors
import (
"strconv"
"strings"
)
type uncaughtPanic struct {
typeName string
message string
}
func (p uncaughtPanic) Error() string {
return p.message
}
// ParsePanic allows you to get an error object from the output of a go program
// that panicked. This is particularly useful with https://github.com/mitchellh/panicwrap.
func ParsePanic(text string) (*Error, error) {
lines := strings.Split(text, "\n")
prefixes := []string{"panic:", "fatal error:"}
state := "start"
var message string
var typeName string
var stack []StackFrame
for i := 0; i < len(lines); i++ {
line := lines[i]
if state == "start" {
for _, prefix := range prefixes {
if strings.HasPrefix(line, prefix) {
message = strings.TrimSpace(strings.TrimPrefix(line, prefix))
typeName = prefix[:len(prefix) - 1]
state = "seek"
break
}
}
if state == "start" {
return nil, Errorf("bugsnag.panicParser: Invalid line (no prefix): %s", line)
}
} else if state == "seek" {
if strings.HasPrefix(line, "goroutine ") && strings.HasSuffix(line, "[running]:") {
state = "parsing"
}
} else if state == "parsing" {
if line == "" || strings.HasPrefix(line, "...") {
state = "done"
break
}
createdBy := false
if strings.HasPrefix(line, "created by ") {
line = strings.TrimPrefix(line, "created by ")
createdBy = true
}
i++
if i >= len(lines) {
return nil, Errorf("bugsnag.panicParser: Invalid line (unpaired): %s", line)
}
frame, err := parsePanicFrame(line, lines[i], createdBy)
if err != nil {
return nil, err
}
stack = append(stack, *frame)
if createdBy {
state = "done"
break
}
}
}
if state == "done" || state == "parsing" {
return &Error{Err: uncaughtPanic{typeName, message}, frames: stack}, nil
}
return nil, Errorf("could not parse panic: %v", text)
}
// The lines we're passing look like this:
//
// main.(*foo).destruct(0xc208067e98)
// /0/go/src/github.com/bugsnag/bugsnag-go/pan/main.go:22 +0x151
func parsePanicFrame(name string, line string, createdBy bool) (*StackFrame, error) {
idx := strings.LastIndex(name, "(")
if idx == -1 && !createdBy {
return nil, Errorf("bugsnag.panicParser: Invalid line (no call): %s", name)
}
if idx != -1 {
name = name[:idx]
}
pkg := ""
if lastslash := strings.LastIndex(name, "/"); lastslash >= 0 {
pkg += name[:lastslash] + "/"
name = name[lastslash+1:]
}
if period := strings.Index(name, "."); period >= 0 {
pkg += name[:period]
name = name[period+1:]
}
name = strings.Replace(name, "·", ".", -1)
if !strings.HasPrefix(line, "\t") {
return nil, Errorf("bugsnag.panicParser: Invalid line (no tab): %s", line)
}
idx = strings.LastIndex(line, ":")
if idx == -1 {
return nil, Errorf("bugsnag.panicParser: Invalid line (no line number): %s", line)
}
file := line[1:idx]
number := line[idx+1:]
if idx = strings.Index(number, " +"); idx > -1 {
number = number[:idx]
}
lno, err := strconv.ParseInt(number, 10, 32)
if err != nil {
return nil, Errorf("bugsnag.panicParser: Invalid line (bad line number): %s", line)
}
return &StackFrame{
File: file,
LineNumber: int(lno),
Package: pkg,
Name: name,
}, nil
}