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Scott Baker2d897982019-09-24 11:50:08 -07001/*
2 *
3 * Copyright 2014 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19// Package codes defines the canonical error codes used by gRPC. It is
20// consistent across various languages.
21package codes // import "google.golang.org/grpc/codes"
22
23import (
24 "fmt"
25 "strconv"
26)
27
28// A Code is an unsigned 32-bit error code as defined in the gRPC spec.
29type Code uint32
30
31const (
32 // OK is returned on success.
33 OK Code = 0
34
35 // Canceled indicates the operation was canceled (typically by the caller).
36 Canceled Code = 1
37
38 // Unknown error. An example of where this error may be returned is
39 // if a Status value received from another address space belongs to
40 // an error-space that is not known in this address space. Also
41 // errors raised by APIs that do not return enough error information
42 // may be converted to this error.
43 Unknown Code = 2
44
45 // InvalidArgument indicates client specified an invalid argument.
46 // Note that this differs from FailedPrecondition. It indicates arguments
47 // that are problematic regardless of the state of the system
48 // (e.g., a malformed file name).
49 InvalidArgument Code = 3
50
51 // DeadlineExceeded means operation expired before completion.
52 // For operations that change the state of the system, this error may be
53 // returned even if the operation has completed successfully. For
54 // example, a successful response from a server could have been delayed
55 // long enough for the deadline to expire.
56 DeadlineExceeded Code = 4
57
58 // NotFound means some requested entity (e.g., file or directory) was
59 // not found.
60 NotFound Code = 5
61
62 // AlreadyExists means an attempt to create an entity failed because one
63 // already exists.
64 AlreadyExists Code = 6
65
66 // PermissionDenied indicates the caller does not have permission to
67 // execute the specified operation. It must not be used for rejections
68 // caused by exhausting some resource (use ResourceExhausted
69 // instead for those errors). It must not be
70 // used if the caller cannot be identified (use Unauthenticated
71 // instead for those errors).
72 PermissionDenied Code = 7
73
74 // ResourceExhausted indicates some resource has been exhausted, perhaps
75 // a per-user quota, or perhaps the entire file system is out of space.
76 ResourceExhausted Code = 8
77
78 // FailedPrecondition indicates operation was rejected because the
79 // system is not in a state required for the operation's execution.
80 // For example, directory to be deleted may be non-empty, an rmdir
81 // operation is applied to a non-directory, etc.
82 //
83 // A litmus test that may help a service implementor in deciding
84 // between FailedPrecondition, Aborted, and Unavailable:
85 // (a) Use Unavailable if the client can retry just the failing call.
86 // (b) Use Aborted if the client should retry at a higher-level
87 // (e.g., restarting a read-modify-write sequence).
88 // (c) Use FailedPrecondition if the client should not retry until
89 // the system state has been explicitly fixed. E.g., if an "rmdir"
90 // fails because the directory is non-empty, FailedPrecondition
91 // should be returned since the client should not retry unless
92 // they have first fixed up the directory by deleting files from it.
93 // (d) Use FailedPrecondition if the client performs conditional
94 // REST Get/Update/Delete on a resource and the resource on the
95 // server does not match the condition. E.g., conflicting
96 // read-modify-write on the same resource.
97 FailedPrecondition Code = 9
98
99 // Aborted indicates the operation was aborted, typically due to a
100 // concurrency issue like sequencer check failures, transaction aborts,
101 // etc.
102 //
103 // See litmus test above for deciding between FailedPrecondition,
104 // Aborted, and Unavailable.
105 Aborted Code = 10
106
107 // OutOfRange means operation was attempted past the valid range.
108 // E.g., seeking or reading past end of file.
109 //
110 // Unlike InvalidArgument, this error indicates a problem that may
111 // be fixed if the system state changes. For example, a 32-bit file
112 // system will generate InvalidArgument if asked to read at an
113 // offset that is not in the range [0,2^32-1], but it will generate
114 // OutOfRange if asked to read from an offset past the current
115 // file size.
116 //
117 // There is a fair bit of overlap between FailedPrecondition and
118 // OutOfRange. We recommend using OutOfRange (the more specific
119 // error) when it applies so that callers who are iterating through
120 // a space can easily look for an OutOfRange error to detect when
121 // they are done.
122 OutOfRange Code = 11
123
124 // Unimplemented indicates operation is not implemented or not
125 // supported/enabled in this service.
126 Unimplemented Code = 12
127
128 // Internal errors. Means some invariants expected by underlying
129 // system has been broken. If you see one of these errors,
130 // something is very broken.
131 Internal Code = 13
132
133 // Unavailable indicates the service is currently unavailable.
134 // This is a most likely a transient condition and may be corrected
135 // by retrying with a backoff.
136 //
137 // See litmus test above for deciding between FailedPrecondition,
138 // Aborted, and Unavailable.
139 Unavailable Code = 14
140
141 // DataLoss indicates unrecoverable data loss or corruption.
142 DataLoss Code = 15
143
144 // Unauthenticated indicates the request does not have valid
145 // authentication credentials for the operation.
146 Unauthenticated Code = 16
147
148 _maxCode = 17
149)
150
151var strToCode = map[string]Code{
152 `"OK"`: OK,
153 `"CANCELLED"`:/* [sic] */ Canceled,
154 `"UNKNOWN"`: Unknown,
155 `"INVALID_ARGUMENT"`: InvalidArgument,
156 `"DEADLINE_EXCEEDED"`: DeadlineExceeded,
157 `"NOT_FOUND"`: NotFound,
158 `"ALREADY_EXISTS"`: AlreadyExists,
159 `"PERMISSION_DENIED"`: PermissionDenied,
160 `"RESOURCE_EXHAUSTED"`: ResourceExhausted,
161 `"FAILED_PRECONDITION"`: FailedPrecondition,
162 `"ABORTED"`: Aborted,
163 `"OUT_OF_RANGE"`: OutOfRange,
164 `"UNIMPLEMENTED"`: Unimplemented,
165 `"INTERNAL"`: Internal,
166 `"UNAVAILABLE"`: Unavailable,
167 `"DATA_LOSS"`: DataLoss,
168 `"UNAUTHENTICATED"`: Unauthenticated,
169}
170
171// UnmarshalJSON unmarshals b into the Code.
172func (c *Code) UnmarshalJSON(b []byte) error {
173 // From json.Unmarshaler: By convention, to approximate the behavior of
174 // Unmarshal itself, Unmarshalers implement UnmarshalJSON([]byte("null")) as
175 // a no-op.
176 if string(b) == "null" {
177 return nil
178 }
179 if c == nil {
180 return fmt.Errorf("nil receiver passed to UnmarshalJSON")
181 }
182
183 if ci, err := strconv.ParseUint(string(b), 10, 32); err == nil {
184 if ci >= _maxCode {
185 return fmt.Errorf("invalid code: %q", ci)
186 }
187
188 *c = Code(ci)
189 return nil
190 }
191
192 if jc, ok := strToCode[string(b)]; ok {
193 *c = jc
194 return nil
195 }
196 return fmt.Errorf("invalid code: %q", string(b))
197}