245 lines
8.9 KiB
Go
245 lines
8.9 KiB
Go
/*
|
|
*
|
|
* Copyright 2014 gRPC 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 codes defines the canonical error codes used by gRPC. It is
|
|
// consistent across various languages.
|
|
package codes // import "google.golang.org/grpc/codes"
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
)
|
|
|
|
// A Code is an unsigned 32-bit error code as defined in the gRPC spec.
|
|
type Code uint32
|
|
|
|
const (
|
|
// OK is returned on success.
|
|
OK Code = 0
|
|
|
|
// Canceled indicates the operation was canceled (typically by the caller).
|
|
//
|
|
// The gRPC framework will generate this error code when cancellation
|
|
// is requested.
|
|
Canceled Code = 1
|
|
|
|
// Unknown error. An example of where this error may be returned is
|
|
// if a Status value received from another address space belongs to
|
|
// an error-space that is not known in this address space. Also
|
|
// errors raised by APIs that do not return enough error information
|
|
// may be converted to this error.
|
|
//
|
|
// The gRPC framework will generate this error code in the above two
|
|
// mentioned cases.
|
|
Unknown Code = 2
|
|
|
|
// InvalidArgument indicates client specified an invalid argument.
|
|
// Note that this differs from FailedPrecondition. It indicates arguments
|
|
// that are problematic regardless of the state of the system
|
|
// (e.g., a malformed file name).
|
|
//
|
|
// This error code will not be generated by the gRPC framework.
|
|
InvalidArgument Code = 3
|
|
|
|
// DeadlineExceeded means operation expired before completion.
|
|
// For operations that change the state of the system, this error may be
|
|
// returned even if the operation has completed successfully. For
|
|
// example, a successful response from a server could have been delayed
|
|
// long enough for the deadline to expire.
|
|
//
|
|
// The gRPC framework will generate this error code when the deadline is
|
|
// exceeded.
|
|
DeadlineExceeded Code = 4
|
|
|
|
// NotFound means some requested entity (e.g., file or directory) was
|
|
// not found.
|
|
//
|
|
// This error code will not be generated by the gRPC framework.
|
|
NotFound Code = 5
|
|
|
|
// AlreadyExists means an attempt to create an entity failed because one
|
|
// already exists.
|
|
//
|
|
// This error code will not be generated by the gRPC framework.
|
|
AlreadyExists Code = 6
|
|
|
|
// PermissionDenied indicates the caller does not have permission to
|
|
// execute the specified operation. It must not be used for rejections
|
|
// caused by exhausting some resource (use ResourceExhausted
|
|
// instead for those errors). It must not be
|
|
// used if the caller cannot be identified (use Unauthenticated
|
|
// instead for those errors).
|
|
//
|
|
// This error code will not be generated by the gRPC core framework,
|
|
// but expect authentication middleware to use it.
|
|
PermissionDenied Code = 7
|
|
|
|
// ResourceExhausted indicates some resource has been exhausted, perhaps
|
|
// a per-user quota, or perhaps the entire file system is out of space.
|
|
//
|
|
// This error code will be generated by the gRPC framework in
|
|
// out-of-memory and server overload situations, or when a message is
|
|
// larger than the configured maximum size.
|
|
ResourceExhausted Code = 8
|
|
|
|
// FailedPrecondition indicates operation was rejected because the
|
|
// system is not in a state required for the operation's execution.
|
|
// For example, directory to be deleted may be non-empty, an rmdir
|
|
// operation is applied to a non-directory, etc.
|
|
//
|
|
// A litmus test that may help a service implementor in deciding
|
|
// between FailedPrecondition, Aborted, and Unavailable:
|
|
// (a) Use Unavailable if the client can retry just the failing call.
|
|
// (b) Use Aborted if the client should retry at a higher-level
|
|
// (e.g., restarting a read-modify-write sequence).
|
|
// (c) Use FailedPrecondition if the client should not retry until
|
|
// the system state has been explicitly fixed. E.g., if an "rmdir"
|
|
// fails because the directory is non-empty, FailedPrecondition
|
|
// should be returned since the client should not retry unless
|
|
// they have first fixed up the directory by deleting files from it.
|
|
// (d) Use FailedPrecondition if the client performs conditional
|
|
// REST Get/Update/Delete on a resource and the resource on the
|
|
// server does not match the condition. E.g., conflicting
|
|
// read-modify-write on the same resource.
|
|
//
|
|
// This error code will not be generated by the gRPC framework.
|
|
FailedPrecondition Code = 9
|
|
|
|
// Aborted indicates the operation was aborted, typically due to a
|
|
// concurrency issue like sequencer check failures, transaction aborts,
|
|
// etc.
|
|
//
|
|
// See litmus test above for deciding between FailedPrecondition,
|
|
// Aborted, and Unavailable.
|
|
//
|
|
// This error code will not be generated by the gRPC framework.
|
|
Aborted Code = 10
|
|
|
|
// OutOfRange means operation was attempted past the valid range.
|
|
// E.g., seeking or reading past end of file.
|
|
//
|
|
// Unlike InvalidArgument, this error indicates a problem that may
|
|
// be fixed if the system state changes. For example, a 32-bit file
|
|
// system will generate InvalidArgument if asked to read at an
|
|
// offset that is not in the range [0,2^32-1], but it will generate
|
|
// OutOfRange if asked to read from an offset past the current
|
|
// file size.
|
|
//
|
|
// There is a fair bit of overlap between FailedPrecondition and
|
|
// OutOfRange. We recommend using OutOfRange (the more specific
|
|
// error) when it applies so that callers who are iterating through
|
|
// a space can easily look for an OutOfRange error to detect when
|
|
// they are done.
|
|
//
|
|
// This error code will not be generated by the gRPC framework.
|
|
OutOfRange Code = 11
|
|
|
|
// Unimplemented indicates operation is not implemented or not
|
|
// supported/enabled in this service.
|
|
//
|
|
// This error code will be generated by the gRPC framework. Most
|
|
// commonly, you will see this error code when a method implementation
|
|
// is missing on the server. It can also be generated for unknown
|
|
// compression algorithms or a disagreement as to whether an RPC should
|
|
// be streaming.
|
|
Unimplemented Code = 12
|
|
|
|
// Internal errors. Means some invariants expected by underlying
|
|
// system has been broken. If you see one of these errors,
|
|
// something is very broken.
|
|
//
|
|
// This error code will be generated by the gRPC framework in several
|
|
// internal error conditions.
|
|
Internal Code = 13
|
|
|
|
// Unavailable indicates the service is currently unavailable.
|
|
// This is a most likely a transient condition and may be corrected
|
|
// by retrying with a backoff. Note that it is not always safe to retry
|
|
// non-idempotent operations.
|
|
//
|
|
// See litmus test above for deciding between FailedPrecondition,
|
|
// Aborted, and Unavailable.
|
|
//
|
|
// This error code will be generated by the gRPC framework during
|
|
// abrupt shutdown of a server process or network connection.
|
|
Unavailable Code = 14
|
|
|
|
// DataLoss indicates unrecoverable data loss or corruption.
|
|
//
|
|
// This error code will not be generated by the gRPC framework.
|
|
DataLoss Code = 15
|
|
|
|
// Unauthenticated indicates the request does not have valid
|
|
// authentication credentials for the operation.
|
|
//
|
|
// The gRPC framework will generate this error code when the
|
|
// authentication metadata is invalid or a Credentials callback fails,
|
|
// but also expect authentication middleware to generate it.
|
|
Unauthenticated Code = 16
|
|
|
|
_maxCode = 17
|
|
)
|
|
|
|
var strToCode = map[string]Code{
|
|
`"OK"`: OK,
|
|
`"CANCELLED"`:/* [sic] */ Canceled,
|
|
`"UNKNOWN"`: Unknown,
|
|
`"INVALID_ARGUMENT"`: InvalidArgument,
|
|
`"DEADLINE_EXCEEDED"`: DeadlineExceeded,
|
|
`"NOT_FOUND"`: NotFound,
|
|
`"ALREADY_EXISTS"`: AlreadyExists,
|
|
`"PERMISSION_DENIED"`: PermissionDenied,
|
|
`"RESOURCE_EXHAUSTED"`: ResourceExhausted,
|
|
`"FAILED_PRECONDITION"`: FailedPrecondition,
|
|
`"ABORTED"`: Aborted,
|
|
`"OUT_OF_RANGE"`: OutOfRange,
|
|
`"UNIMPLEMENTED"`: Unimplemented,
|
|
`"INTERNAL"`: Internal,
|
|
`"UNAVAILABLE"`: Unavailable,
|
|
`"DATA_LOSS"`: DataLoss,
|
|
`"UNAUTHENTICATED"`: Unauthenticated,
|
|
}
|
|
|
|
// UnmarshalJSON unmarshals b into the Code.
|
|
func (c *Code) UnmarshalJSON(b []byte) error {
|
|
// From json.Unmarshaler: By convention, to approximate the behavior of
|
|
// Unmarshal itself, Unmarshalers implement UnmarshalJSON([]byte("null")) as
|
|
// a no-op.
|
|
if string(b) == "null" {
|
|
return nil
|
|
}
|
|
if c == nil {
|
|
return fmt.Errorf("nil receiver passed to UnmarshalJSON")
|
|
}
|
|
|
|
if ci, err := strconv.ParseUint(string(b), 10, 32); err == nil {
|
|
if ci >= _maxCode {
|
|
return fmt.Errorf("invalid code: %q", ci)
|
|
}
|
|
|
|
*c = Code(ci)
|
|
return nil
|
|
}
|
|
|
|
if jc, ok := strToCode[string(b)]; ok {
|
|
*c = jc
|
|
return nil
|
|
}
|
|
return fmt.Errorf("invalid code: %q", string(b))
|
|
}
|