forked from v2fly/v2ray-core
-
Notifications
You must be signed in to change notification settings - Fork 29
/
errors.go
207 lines (177 loc) · 3.75 KB
/
errors.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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
// Package errors is a drop-in replacement for Golang lib 'errors'.
package errors // import "v2ray.com/core/common/errors"
import (
"context"
"os"
"strings"
"v2ray.com/core/common/log"
"v2ray.com/core/common/serial"
"v2ray.com/core/common/session"
)
type hasInnerError interface {
// Inner returns the underlying error of this one.
Inner() error
}
type hasSeverity interface {
Severity() log.Severity
}
type hasContext interface {
Context() context.Context
}
// Error is an error object with underlying error.
type Error struct {
message []interface{}
inner error
severity log.Severity
path []string
ctx context.Context
}
// Error implements error.Error().
func (v *Error) Error() string {
msg := serial.Concat(v.message...)
if v.inner != nil {
msg += " > " + v.inner.Error()
}
if len(v.path) > 0 {
msg = strings.Join(v.path, "|") + ": " + msg
}
return msg
}
// Inner implements hasInnerError.Inner()
func (v *Error) Inner() error {
if v.inner == nil {
return nil
}
return v.inner
}
func (v *Error) Base(err error) *Error {
v.inner = err
return v
}
func (v *Error) WithContext(ctx context.Context) *Error {
v.ctx = ctx
return v
}
// Context returns the context that associated with the Error.
func (v *Error) Context() context.Context {
if v.ctx != nil {
return v.ctx
}
if v.inner == nil {
return nil
}
if c, ok := v.inner.(hasContext); ok {
return c.Context()
}
return nil
}
func (v *Error) atSeverity(s log.Severity) *Error {
v.severity = s
return v
}
func (v *Error) Severity() log.Severity {
if v.inner == nil {
return v.severity
}
if s, ok := v.inner.(hasSeverity); ok {
as := s.Severity()
if as < v.severity {
return as
}
}
return v.severity
}
// AtDebug sets the severity to debug.
func (v *Error) AtDebug() *Error {
return v.atSeverity(log.Severity_Debug)
}
// AtInfo sets the severity to info.
func (v *Error) AtInfo() *Error {
return v.atSeverity(log.Severity_Info)
}
// AtWarning sets the severity to warning.
func (v *Error) AtWarning() *Error {
return v.atSeverity(log.Severity_Warning)
}
// AtError sets the severity to error.
func (v *Error) AtError() *Error {
return v.atSeverity(log.Severity_Error)
}
// Path sets the path to the location where this error happens.
func (v *Error) Path(path ...string) *Error {
v.path = path
return v
}
// String returns the string representation of this error.
func (v *Error) String() string {
return v.Error()
}
// WriteToLog writes current error into log.
func (v *Error) WriteToLog() {
ctx := v.Context()
var sid session.ID
if ctx != nil {
sid = session.IDFromContext(ctx)
}
var c interface{} = v
if sid > 0 {
c = sessionLog{
id: sid,
content: v,
}
}
log.Record(&log.GeneralMessage{
Severity: GetSeverity(v),
Content: c,
})
}
// New returns a new error object with message formed from given arguments.
func New(msg ...interface{}) *Error {
return &Error{
message: msg,
severity: log.Severity_Info,
}
}
// Cause returns the root cause of this error.
func Cause(err error) error {
if err == nil {
return nil
}
L:
for {
switch inner := err.(type) {
case hasInnerError:
if inner.Inner() == nil {
break L
}
err = inner.Inner()
case *os.PathError:
if inner.Err == nil {
break L
}
err = inner.Err
case *os.SyscallError:
if inner.Err == nil {
break L
}
err = inner.Err
default:
break L
}
}
return err
}
// GetSeverity returns the actual severity of the error, including inner errors.
func GetSeverity(err error) log.Severity {
if s, ok := err.(hasSeverity); ok {
return s.Severity()
}
return log.Severity_Info
}
type sessionLog struct {
id session.ID
content interface{}
}
func (s sessionLog) String() string {
return serial.Concat("[", s.id, "] ", s.content)
}