Round 4
Signed-off-by: Doug Davis <dug@us.ibm.com>
This commit is contained in:
Doug Davis
parent
b8b16b78f4
commit
56349665b7
13 changed files with 334 additions and 197 deletions
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@ -1,106 +1,29 @@
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package errcode
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"strings"
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"sync"
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)
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// ErrorCoder is the base interface for ErrorCode and Error allowing
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// users of each to just call ErrorCode to get the real ID of each
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type ErrorCoder interface {
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ErrorCode() ErrorCode
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}
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// ErrorCode represents the error type. The errors are serialized via strings
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// and the integer format may change and should *never* be exported.
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type ErrorCode int
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// ErrorDescriptor provides relevant information about a given error code.
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type ErrorDescriptor struct {
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// Code is the error code that this descriptor describes.
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Code ErrorCode
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// Value provides a unique, string key, often captilized with
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// underscores, to identify the error code. This value is used as the
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// keyed value when serializing api errors.
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Value string
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// Message is a short, human readable decription of the error condition
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// included in API responses.
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Message string
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// Description provides a complete account of the errors purpose, suitable
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// for use in documentation.
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Description string
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// HTTPStatusCode provides the http status code that is associated with
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// this error condition.
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HTTPStatusCode int
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// ErrorCode just returns itself
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func (ec ErrorCode) ErrorCode() ErrorCode {
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return ec
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}
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var (
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errorCodeToDescriptors = map[ErrorCode]ErrorDescriptor{}
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idToDescriptors = map[string]ErrorDescriptor{}
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groupToDescriptors = map[string][]ErrorDescriptor{}
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)
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// ErrorCodeUnknown is a generic error that can be used as a last
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// resort if there is no situation-specific error message that can be used
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var ErrorCodeUnknown = Register("registry.api.errcode", ErrorDescriptor{
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Value: "UNKNOWN",
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Message: "unknown error",
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Description: `Generic error returned when the error does not have an
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API classification.`,
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HTTPStatusCode: http.StatusInternalServerError,
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})
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var nextCode = 1000
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var registerLock sync.Mutex
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// Register will make the passed-in error known to the environment and
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// return a new ErrorCode
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func Register(group string, descriptor ErrorDescriptor) ErrorCode {
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registerLock.Lock()
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defer registerLock.Unlock()
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code := ErrorCode(nextCode)
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descriptor.Code = code
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if _, ok := idToDescriptors[descriptor.Value]; ok {
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panic(fmt.Sprintf("ErrorValue %s is already registered", descriptor.Value))
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}
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if _, ok := errorCodeToDescriptors[descriptor.Code]; ok {
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panic(fmt.Sprintf("ErrorCode %d is already registered", descriptor.Code))
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}
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groupToDescriptors[group] = append(groupToDescriptors[group], descriptor)
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errorCodeToDescriptors[code] = descriptor
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idToDescriptors[descriptor.Value] = descriptor
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nextCode++
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return code
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}
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// ParseErrorCode returns the value by the string error code.
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// `ErrorCodeUnknown` will be returned if the error is not known.
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func ParseErrorCode(value string) ErrorCode {
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ed, ok := idToDescriptors[value]
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if ok {
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return ed.Code
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}
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return ErrorCodeUnknown
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}
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// GetGroupNames returns the list of Error group names that are registered
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func GetGroupNames() []string {
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keys := []string{}
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for k := range groupToDescriptors {
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keys = append(keys, k)
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}
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return keys
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}
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// GetErrorCodeGroup returns the named group of error descriptors
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func GetErrorCodeGroup(name string) []ErrorDescriptor {
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return groupToDescriptors[name]
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// Error returns the ID/Value
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func (ec ErrorCode) Error() string {
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return ec.Descriptor().Value
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}
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// Descriptor returns the descriptor for the error code.
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@ -143,12 +66,30 @@ func (ec *ErrorCode) UnmarshalText(text []byte) error {
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return nil
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}
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// WithDetail creates a new Error struct based on the passed-in info and
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// set the Detail property appropriately
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func (ec ErrorCode) WithDetail(detail interface{}) Error {
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if err, ok := detail.(error); ok {
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detail = err.Error()
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}
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return Error{
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Code: ec,
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Detail: detail,
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}
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}
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// Error provides a wrapper around ErrorCode with extra Details provided.
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type Error struct {
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Code ErrorCode `json:"code"`
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Detail interface{} `json:"detail,omitempty"`
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}
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// ErrorCode returns the ID/Value of this Error
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func (e Error) ErrorCode() ErrorCode {
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return e.Code
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}
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// Error returns a human readable representation of the error.
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func (e Error) Error() string {
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return fmt.Sprintf("%s: %s",
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@ -161,30 +102,43 @@ func (e Error) Message() string {
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return e.Code.Message()
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}
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// ErrorDescriptor provides relevant information about a given error code.
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type ErrorDescriptor struct {
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// Code is the error code that this descriptor describes.
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Code ErrorCode
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// Value provides a unique, string key, often captilized with
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// underscores, to identify the error code. This value is used as the
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// keyed value when serializing api errors.
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Value string
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// Message is a short, human readable decription of the error condition
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// included in API responses.
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Message string
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// Description provides a complete account of the errors purpose, suitable
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// for use in documentation.
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Description string
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// HTTPStatusCode provides the http status code that is associated with
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// this error condition.
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HTTPStatusCode int
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}
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// ParseErrorCode returns the value by the string error code.
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// `ErrorCodeUnknown` will be returned if the error is not known.
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func ParseErrorCode(value string) ErrorCode {
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ed, ok := idToDescriptors[value]
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if ok {
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return ed.Code
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}
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return ErrorCodeUnknown
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}
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// Errors provides the envelope for multiple errors and a few sugar methods
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// for use within the application.
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type Errors []Error
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// NewError creates a new Error struct based on the passed-in info
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func NewError(code ErrorCode, details ...interface{}) Error {
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if len(details) > 1 {
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panic("please specify zero or one detail items for this error")
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}
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var detail interface{}
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if len(details) > 0 {
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detail = details[0]
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}
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if err, ok := detail.(error); ok {
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detail = err.Error()
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}
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return Error{
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Code: code,
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Detail: detail,
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}
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}
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type Errors []error
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func (errs Errors) Error() string {
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switch len(errs) {
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@ -205,3 +159,67 @@ func (errs Errors) Error() string {
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func (errs Errors) Len() int {
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return len(errs)
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}
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// jsonError extends Error with 'Message' so that we can include the
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// error text, just in case the receiver of the JSON doesn't have this
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// particular ErrorCode registered
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type jsonError struct {
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Code ErrorCode `json:"code"`
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Message string `json:"message"`
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Detail interface{} `json:"detail,omitempty"`
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}
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// MarshalJSON converts slice of error, ErrorCode or Error into a
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// slice of Error - then serializes
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func (errs Errors) MarshalJSON() ([]byte, error) {
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var tmpErrs []jsonError
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for _, daErr := range errs {
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var err Error
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switch daErr.(type) {
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case ErrorCode:
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err = daErr.(ErrorCode).WithDetail(nil)
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case Error:
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err = daErr.(Error)
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default:
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err = ErrorCodeUnknown.WithDetail(daErr)
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}
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tmpErrs = append(tmpErrs, jsonError{
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Code: err.Code,
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Message: err.Message(),
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Detail: err.Detail,
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})
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}
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return json.Marshal(tmpErrs)
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}
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// UnmarshalJSON deserializes []Error and then converts it into slice of
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// Error or ErrorCode
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func (errs *Errors) UnmarshalJSON(data []byte) error {
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var tmpErrs []jsonError
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if err := json.Unmarshal(data, &tmpErrs); err != nil {
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return err
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}
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var newErrs Errors
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for _, daErr := range tmpErrs {
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if daErr.Detail == nil {
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// Error's w/o details get converted to ErrorCode
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newErrs = append(newErrs, daErr.Code)
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} else {
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// Error's w/ details are untouched
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newErrs = append(newErrs, Error{
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Code: daErr.Code,
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Detail: daErr.Detail,
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})
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}
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}
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*errs = newErrs
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return nil
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}
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@ -79,8 +79,8 @@ var ErrorCodeTest2 = Register("v2.errors", ErrorDescriptor{
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func TestErrorsManagement(t *testing.T) {
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var errs Errors
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errs = append(errs, NewError(ErrorCodeTest1))
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errs = append(errs, NewError(ErrorCodeTest2,
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errs = append(errs, ErrorCodeTest1)
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errs = append(errs, ErrorCodeTest2.WithDetail(
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map[string]interface{}{"digest": "sometestblobsumdoesntmatter"}))
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p, err := json.Marshal(errs)
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@ -89,10 +89,10 @@ func TestErrorsManagement(t *testing.T) {
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t.Fatalf("error marashaling errors: %v", err)
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}
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expectedJSON := "[{\"code\":\"TEST1\"},{\"code\":\"TEST2\",\"detail\":{\"digest\":\"sometestblobsumdoesntmatter\"}}]"
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expectedJSON := "[{\"code\":\"TEST1\",\"message\":\"test error 1\"},{\"code\":\"TEST2\",\"message\":\"test error 2\",\"detail\":{\"digest\":\"sometestblobsumdoesntmatter\"}}]"
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if string(p) != expectedJSON {
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t.Fatalf("unexpected json: %q != %q", string(p), expectedJSON)
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t.Fatalf("unexpected json:\ngot:\n%q\n\nexpected:\n%q", string(p), expectedJSON)
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}
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// Now test the reverse
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}
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// Test again with a single value this time
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errs = Errors{NewError(ErrorCodeUnknown)}
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expectedJSON = "[{\"code\":\"UNKNOWN\"}]"
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errs = Errors{ErrorCodeUnknown}
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expectedJSON = "[{\"code\":\"UNKNOWN\",\"message\":\"unknown error\"}]"
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p, err = json.Marshal(errs)
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if err != nil {
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86
docs/api/errcode/register.go
Normal file
86
docs/api/errcode/register.go
Normal file
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@ -0,0 +1,86 @@
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package errcode
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import (
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"fmt"
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"net/http"
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"sort"
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"sync"
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)
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var (
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errorCodeToDescriptors = map[ErrorCode]ErrorDescriptor{}
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idToDescriptors = map[string]ErrorDescriptor{}
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groupToDescriptors = map[string][]ErrorDescriptor{}
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)
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// ErrorCodeUnknown is a generic error that can be used as a last
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// resort if there is no situation-specific error message that can be used
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var ErrorCodeUnknown = Register("errcode", ErrorDescriptor{
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Value: "UNKNOWN",
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Message: "unknown error",
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Description: `Generic error returned when the error does not have an
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API classification.`,
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HTTPStatusCode: http.StatusInternalServerError,
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})
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var nextCode = 1000
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var registerLock sync.Mutex
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// Register will make the passed-in error known to the environment and
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// return a new ErrorCode
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func Register(group string, descriptor ErrorDescriptor) ErrorCode {
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registerLock.Lock()
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defer registerLock.Unlock()
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descriptor.Code = ErrorCode(nextCode)
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if _, ok := idToDescriptors[descriptor.Value]; ok {
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panic(fmt.Sprintf("ErrorValue %q is already registered", descriptor.Value))
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}
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if _, ok := errorCodeToDescriptors[descriptor.Code]; ok {
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panic(fmt.Sprintf("ErrorCode %v is already registered", descriptor.Code))
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}
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groupToDescriptors[group] = append(groupToDescriptors[group], descriptor)
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errorCodeToDescriptors[descriptor.Code] = descriptor
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idToDescriptors[descriptor.Value] = descriptor
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nextCode++
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return descriptor.Code
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}
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type byValue []ErrorDescriptor
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func (a byValue) Len() int { return len(a) }
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func (a byValue) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a byValue) Less(i, j int) bool { return a[i].Value < a[j].Value }
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// GetGroupNames returns the list of Error group names that are registered
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func GetGroupNames() []string {
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keys := []string{}
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for k := range groupToDescriptors {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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return keys
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}
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// GetErrorCodeGroup returns the named group of error descriptors
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func GetErrorCodeGroup(name string) []ErrorDescriptor {
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desc := groupToDescriptors[name]
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sort.Sort(byValue(desc))
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return desc
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}
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// GetErrorAllDescriptors returns a slice of all ErrorDescriptors that are
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// registered, irrespective of what group they're in
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func GetErrorAllDescriptors() []ErrorDescriptor {
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result := []ErrorDescriptor{}
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for _, group := range GetGroupNames() {
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result = append(result, GetErrorCodeGroup(group)...)
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}
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sort.Sort(byValue(result))
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return result
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}
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@ -6,9 +6,11 @@ import (
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"github.com/docker/distribution/registry/api/errcode"
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)
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const errGroup = "registry.api.v2"
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var (
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// ErrorCodeUnsupported is returned when an operation is not supported.
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ErrorCodeUnsupported = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
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ErrorCodeUnsupported = errcode.Register(errGroup, errcode.ErrorDescriptor{
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Value: "UNSUPPORTED",
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Message: "The operation is unsupported.",
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Description: `The operation was unsupported due to a missing
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@ -16,7 +18,7 @@ var (
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})
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// ErrorCodeUnauthorized is returned if a request is not authorized.
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ErrorCodeUnauthorized = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
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ErrorCodeUnauthorized = errcode.Register(errGroup, errcode.ErrorDescriptor{
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Value: "UNAUTHORIZED",
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Message: "access to the requested resource is not authorized",
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Description: `The access controller denied access for the operation on
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@ -27,7 +29,7 @@ var (
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// ErrorCodeDigestInvalid is returned when uploading a blob if the
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// provided digest does not match the blob contents.
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ErrorCodeDigestInvalid = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
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ErrorCodeDigestInvalid = errcode.Register(errGroup, errcode.ErrorDescriptor{
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Value: "DIGEST_INVALID",
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Message: "provided digest did not match uploaded content",
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Description: `When a blob is uploaded, the registry will check that
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@ -39,7 +41,7 @@ var (
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})
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// ErrorCodeSizeInvalid is returned when uploading a blob if the provided
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ErrorCodeSizeInvalid = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
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ErrorCodeSizeInvalid = errcode.Register(errGroup, errcode.ErrorDescriptor{
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Value: "SIZE_INVALID",
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Message: "provided length did not match content length",
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Description: `When a layer is uploaded, the provided size will be
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@ -50,7 +52,7 @@ var (
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// ErrorCodeNameInvalid is returned when the name in the manifest does not
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// match the provided name.
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ErrorCodeNameInvalid = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
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ErrorCodeNameInvalid = errcode.Register(errGroup, errcode.ErrorDescriptor{
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Value: "NAME_INVALID",
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Message: "invalid repository name",
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Description: `Invalid repository name encountered either during
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@ -60,7 +62,7 @@ var (
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// ErrorCodeTagInvalid is returned when the tag in the manifest does not
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// match the provided tag.
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ErrorCodeTagInvalid = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
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ErrorCodeTagInvalid = errcode.Register(errGroup, errcode.ErrorDescriptor{
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Value: "TAG_INVALID",
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Message: "manifest tag did not match URI",
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Description: `During a manifest upload, if the tag in the manifest
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@ -69,7 +71,7 @@ var (
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})
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// ErrorCodeNameUnknown when the repository name is not known.
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ErrorCodeNameUnknown = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
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ErrorCodeNameUnknown = errcode.Register(errGroup, errcode.ErrorDescriptor{
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Value: "NAME_UNKNOWN",
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Message: "repository name not known to registry",
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Description: `This is returned if the name used during an operation is
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@ -78,7 +80,7 @@ var (
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})
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// ErrorCodeManifestUnknown returned when image manifest is unknown.
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ErrorCodeManifestUnknown = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
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ErrorCodeManifestUnknown = errcode.Register(errGroup, errcode.ErrorDescriptor{
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Value: "MANIFEST_UNKNOWN",
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Message: "manifest unknown",
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Description: `This error is returned when the manifest, identified by
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@ -89,7 +91,7 @@ var (
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// ErrorCodeManifestInvalid returned when an image manifest is invalid,
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// typically during a PUT operation. This error encompasses all errors
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// encountered during manifest validation that aren't signature errors.
|
||||
ErrorCodeManifestInvalid = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
|
||||
ErrorCodeManifestInvalid = errcode.Register(errGroup, errcode.ErrorDescriptor{
|
||||
Value: "MANIFEST_INVALID",
|
||||
Message: "manifest invalid",
|
||||
Description: `During upload, manifests undergo several checks ensuring
|
||||
|
|
@ -101,7 +103,7 @@ var (
|
|||
|
||||
// ErrorCodeManifestUnverified is returned when the manifest fails
|
||||
// signature verfication.
|
||||
ErrorCodeManifestUnverified = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
|
||||
ErrorCodeManifestUnverified = errcode.Register(errGroup, errcode.ErrorDescriptor{
|
||||
Value: "MANIFEST_UNVERIFIED",
|
||||
Message: "manifest failed signature verification",
|
||||
Description: `During manifest upload, if the manifest fails signature
|
||||
|
|
@ -111,7 +113,7 @@ var (
|
|||
|
||||
// ErrorCodeManifestBlobUnknown is returned when a manifest blob is
|
||||
// unknown to the registry.
|
||||
ErrorCodeManifestBlobUnknown = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
|
||||
ErrorCodeManifestBlobUnknown = errcode.Register(errGroup, errcode.ErrorDescriptor{
|
||||
Value: "MANIFEST_BLOB_UNKNOWN",
|
||||
Message: "blob unknown to registry",
|
||||
Description: `This error may be returned when a manifest blob is
|
||||
|
|
@ -122,7 +124,7 @@ var (
|
|||
// ErrorCodeBlobUnknown is returned when a blob is unknown to the
|
||||
// registry. This can happen when the manifest references a nonexistent
|
||||
// layer or the result is not found by a blob fetch.
|
||||
ErrorCodeBlobUnknown = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
|
||||
ErrorCodeBlobUnknown = errcode.Register(errGroup, errcode.ErrorDescriptor{
|
||||
Value: "BLOB_UNKNOWN",
|
||||
Message: "blob unknown to registry",
|
||||
Description: `This error may be returned when a blob is unknown to the
|
||||
|
|
@ -133,7 +135,7 @@ var (
|
|||
})
|
||||
|
||||
// ErrorCodeBlobUploadUnknown is returned when an upload is unknown.
|
||||
ErrorCodeBlobUploadUnknown = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
|
||||
ErrorCodeBlobUploadUnknown = errcode.Register(errGroup, errcode.ErrorDescriptor{
|
||||
Value: "BLOB_UPLOAD_UNKNOWN",
|
||||
Message: "blob upload unknown to registry",
|
||||
Description: `If a blob upload has been cancelled or was never
|
||||
|
|
@ -142,7 +144,7 @@ var (
|
|||
})
|
||||
|
||||
// ErrorCodeBlobUploadInvalid is returned when an upload is invalid.
|
||||
ErrorCodeBlobUploadInvalid = errcode.Register("registry.api.v2", errcode.ErrorDescriptor{
|
||||
ErrorCodeBlobUploadInvalid = errcode.Register(errGroup, errcode.ErrorDescriptor{
|
||||
Value: "BLOB_UPLOAD_INVALID",
|
||||
Message: "blob upload invalid",
|
||||
Description: `The blob upload encountered an error and can no
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue