-
Notifications
You must be signed in to change notification settings - Fork 1
/
errors.go
228 lines (202 loc) · 7.92 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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package field
import (
"encoding/json"
"fmt"
"strings"
utilerrors "k8s.io/client-go/pkg/util/errors"
)
// Error is an implementation of the 'error' interface, which represents a
// field-level validation error.
type Error struct {
Type ErrorType
Field string
BadValue interface{}
Detail string
}
var _ error = &Error{}
// Error implements the error interface.
func (v *Error) Error() string {
return fmt.Sprintf("%s: %s", v.Field, v.ErrorBody())
}
// ErrorBody returns the error message without the field name. This is useful
// for building nice-looking higher-level error reporting.
func (v *Error) ErrorBody() string {
var s string
switch v.Type {
case ErrorTypeRequired, ErrorTypeForbidden, ErrorTypeTooLong, ErrorTypeInternal:
s = fmt.Sprintf("%s", v.Type)
default:
var bad string
badBytes, err := json.Marshal(v.BadValue)
if err != nil {
bad = err.Error()
} else {
bad = string(badBytes)
}
s = fmt.Sprintf("%s: %s", v.Type, bad)
}
if len(v.Detail) != 0 {
s += fmt.Sprintf(": %s", v.Detail)
}
return s
}
// ErrorType is a machine readable value providing more detail about why
// a field is invalid. These values are expected to match 1-1 with
// CauseType in api/types.go.
type ErrorType string
// TODO: These values are duplicated in api/types.go, but there's a circular dep. Fix it.
const (
// ErrorTypeNotFound is used to report failure to find a requested value
// (e.g. looking up an ID). See NotFound().
ErrorTypeNotFound ErrorType = "FieldValueNotFound"
// ErrorTypeRequired is used to report required values that are not
// provided (e.g. empty strings, null values, or empty arrays). See
// Required().
ErrorTypeRequired ErrorType = "FieldValueRequired"
// ErrorTypeDuplicate is used to report collisions of values that must be
// unique (e.g. unique IDs). See Duplicate().
ErrorTypeDuplicate ErrorType = "FieldValueDuplicate"
// ErrorTypeInvalid is used to report malformed values (e.g. failed regex
// match, too long, out of bounds). See Invalid().
ErrorTypeInvalid ErrorType = "FieldValueInvalid"
// ErrorTypeNotSupported is used to report unknown values for enumerated
// fields (e.g. a list of valid values). See NotSupported().
ErrorTypeNotSupported ErrorType = "FieldValueNotSupported"
// ErrorTypeForbidden is used to report valid (as per formatting rules)
// values which would be accepted under some conditions, but which are not
// permitted by the current conditions (such as security policy). See
// Forbidden().
ErrorTypeForbidden ErrorType = "FieldValueForbidden"
// ErrorTypeTooLong is used to report that the given value is too long.
// This is similar to ErrorTypeInvalid, but the error will not include the
// too-long value. See TooLong().
ErrorTypeTooLong ErrorType = "FieldValueTooLong"
// ErrorTypeInternal is used to report other errors that are not related
// to user input. See InternalError().
ErrorTypeInternal ErrorType = "InternalError"
)
// String converts a ErrorType into its corresponding canonical error message.
func (t ErrorType) String() string {
switch t {
case ErrorTypeNotFound:
return "Not found"
case ErrorTypeRequired:
return "Required value"
case ErrorTypeDuplicate:
return "Duplicate value"
case ErrorTypeInvalid:
return "Invalid value"
case ErrorTypeNotSupported:
return "Unsupported value"
case ErrorTypeForbidden:
return "Forbidden"
case ErrorTypeTooLong:
return "Too long"
case ErrorTypeInternal:
return "Internal error"
default:
panic(fmt.Sprintf("unrecognized validation error: %q", string(t)))
}
}
// NotFound returns a *Error indicating "value not found". This is
// used to report failure to find a requested value (e.g. looking up an ID).
func NotFound(field *Path, value interface{}) *Error {
return &Error{ErrorTypeNotFound, field.String(), value, ""}
}
// Required returns a *Error indicating "value required". This is used
// to report required values that are not provided (e.g. empty strings, null
// values, or empty arrays).
func Required(field *Path, detail string) *Error {
return &Error{ErrorTypeRequired, field.String(), "", detail}
}
// Duplicate returns a *Error indicating "duplicate value". This is
// used to report collisions of values that must be unique (e.g. names or IDs).
func Duplicate(field *Path, value interface{}) *Error {
return &Error{ErrorTypeDuplicate, field.String(), value, ""}
}
// Invalid returns a *Error indicating "invalid value". This is used
// to report malformed values (e.g. failed regex match, too long, out of bounds).
func Invalid(field *Path, value interface{}, detail string) *Error {
return &Error{ErrorTypeInvalid, field.String(), value, detail}
}
// NotSupported returns a *Error indicating "unsupported value".
// This is used to report unknown values for enumerated fields (e.g. a list of
// valid values).
func NotSupported(field *Path, value interface{}, validValues []string) *Error {
detail := ""
if validValues != nil && len(validValues) > 0 {
detail = "supported values: " + strings.Join(validValues, ", ")
}
return &Error{ErrorTypeNotSupported, field.String(), value, detail}
}
// Forbidden returns a *Error indicating "forbidden". This is used to
// report valid (as per formatting rules) values which would be accepted under
// some conditions, but which are not permitted by current conditions (e.g.
// security policy).
func Forbidden(field *Path, detail string) *Error {
return &Error{ErrorTypeForbidden, field.String(), "", detail}
}
// TooLong returns a *Error indicating "too long". This is used to
// report that the given value is too long. This is similar to
// Invalid, but the returned error will not include the too-long
// value.
func TooLong(field *Path, value interface{}, maxLength int) *Error {
return &Error{ErrorTypeTooLong, field.String(), value, fmt.Sprintf("must have at most %d characters", maxLength)}
}
// InternalError returns a *Error indicating "internal error". This is used
// to signal that an error was found that was not directly related to user
// input. The err argument must be non-nil.
func InternalError(field *Path, err error) *Error {
return &Error{ErrorTypeInternal, field.String(), nil, err.Error()}
}
// ErrorList holds a set of Errors. It is plausible that we might one day have
// non-field errors in this same umbrella package, but for now we don't, so
// we can keep it simple and leave ErrorList here.
type ErrorList []*Error
// NewErrorTypeMatcher returns an errors.Matcher that returns true
// if the provided error is a Error and has the provided ErrorType.
func NewErrorTypeMatcher(t ErrorType) utilerrors.Matcher {
return func(err error) bool {
if e, ok := err.(*Error); ok {
return e.Type == t
}
return false
}
}
// ToAggregate converts the ErrorList into an errors.Aggregate.
func (list ErrorList) ToAggregate() utilerrors.Aggregate {
errs := make([]error, len(list))
for i := range list {
errs[i] = list[i]
}
return utilerrors.NewAggregate(errs)
}
func fromAggregate(agg utilerrors.Aggregate) ErrorList {
errs := agg.Errors()
list := make(ErrorList, len(errs))
for i := range errs {
list[i] = errs[i].(*Error)
}
return list
}
// Filter removes items from the ErrorList that match the provided fns.
func (list ErrorList) Filter(fns ...utilerrors.Matcher) ErrorList {
err := utilerrors.FilterOut(list.ToAggregate(), fns...)
if err == nil {
return nil
}
// FilterOut takes an Aggregate and returns an Aggregate
return fromAggregate(err.(utilerrors.Aggregate))
}