distribution/errors.go
Brian Bland 88795e0a14 Lots of various golint fixes
Changes some names to match go conventions
Comments all exported methods
Removes dot imports
2014-11-17 15:46:06 -08:00

288 lines
8.2 KiB
Go

package registry
import (
"fmt"
"strings"
)
// ErrorCode represents the error type. The errors are serialized via strings
// and the integer format may change and should *never* be exported.
type ErrorCode int
const (
// ErrorCodeUnknown is a catch-all for errors not defined below.
ErrorCodeUnknown ErrorCode = iota
// The following errors can happen during a layer upload.
// ErrorCodeInvalidChecksum is returned when uploading a layer if the
// provided checksum does not match the layer contents.
ErrorCodeInvalidChecksum
// ErrorCodeInvalidLength is returned when uploading a layer if the provided
// length does not match the content length.
ErrorCodeInvalidLength
// ErrorCodeInvalidTarsum is returned when the provided tarsum does not
// match the computed tarsum of the contents.
ErrorCodeInvalidTarsum
// The following errors can happen during manifest upload.
// ErrorCodeInvalidName is returned when the name in the manifest does not
// match the provided name.
ErrorCodeInvalidName
// ErrorCodeInvalidTag is returned when the tag in the manifest does not
// match the provided tag.
ErrorCodeInvalidTag
// ErrorCodeUnverifiedManifest is returned when the manifest fails signature
// validation.
ErrorCodeUnverifiedManifest
// ErrorCodeUnknownLayer is returned when the manifest references a
// nonexistent layer.
ErrorCodeUnknownLayer
// ErrorCodeUntrustedSignature is returned when the manifest is signed by an
// untrusted source.
ErrorCodeUntrustedSignature
)
var errorCodeStrings = map[ErrorCode]string{
ErrorCodeUnknown: "UNKNOWN",
ErrorCodeInvalidChecksum: "INVALID_CHECKSUM",
ErrorCodeInvalidLength: "INVALID_LENGTH",
ErrorCodeInvalidTarsum: "INVALID_TARSUM",
ErrorCodeInvalidName: "INVALID_NAME",
ErrorCodeInvalidTag: "INVALID_TAG",
ErrorCodeUnverifiedManifest: "UNVERIFIED_MANIFEST",
ErrorCodeUnknownLayer: "UNKNOWN_LAYER",
ErrorCodeUntrustedSignature: "UNTRUSTED_SIGNATURE",
}
var errorCodesMessages = map[ErrorCode]string{
ErrorCodeUnknown: "unknown error",
ErrorCodeInvalidChecksum: "provided checksum did not match uploaded content",
ErrorCodeInvalidLength: "provided length did not match content length",
ErrorCodeInvalidTarsum: "provided tarsum did not match binary content",
ErrorCodeInvalidName: "Manifest name did not match URI",
ErrorCodeInvalidTag: "Manifest tag did not match URI",
ErrorCodeUnverifiedManifest: "Manifest failed signature validation",
ErrorCodeUnknownLayer: "Referenced layer not available",
ErrorCodeUntrustedSignature: "Manifest signed by untrusted source",
}
var stringToErrorCode map[string]ErrorCode
func init() {
stringToErrorCode = make(map[string]ErrorCode, len(errorCodeStrings))
// Build up reverse error code map
for k, v := range errorCodeStrings {
stringToErrorCode[v] = k
}
}
// ParseErrorCode attempts to parse the error code string, returning
// ErrorCodeUnknown if the error is not known.
func ParseErrorCode(s string) ErrorCode {
ec, ok := stringToErrorCode[s]
if !ok {
return ErrorCodeUnknown
}
return ec
}
// String returns the canonical identifier for this error code.
func (ec ErrorCode) String() string {
s, ok := errorCodeStrings[ec]
if !ok {
return errorCodeStrings[ErrorCodeUnknown]
}
return s
}
// Message returned the human-readable error message for this error code.
func (ec ErrorCode) Message() string {
m, ok := errorCodesMessages[ec]
if !ok {
return errorCodesMessages[ErrorCodeUnknown]
}
return m
}
// MarshalText encodes the receiver into UTF-8-encoded text and returns the
// result.
func (ec ErrorCode) MarshalText() (text []byte, err error) {
return []byte(ec.String()), nil
}
// UnmarshalText decodes the form generated by MarshalText.
func (ec *ErrorCode) UnmarshalText(text []byte) error {
*ec = stringToErrorCode[string(text)]
return nil
}
// Error provides a wrapper around ErrorCode with extra Details provided.
type Error struct {
Code ErrorCode `json:"code,omitempty"`
Message string `json:"message,omitempty"`
Detail interface{} `json:"detail,omitempty"`
}
// Error returns a human readable representation of the error.
func (e Error) Error() string {
return fmt.Sprintf("%s: %s",
strings.Title(strings.Replace(e.Code.String(), "_", " ", -1)),
e.Message)
}
// Errors provides the envelope for multiple errors and a few sugar methods
// for use within the application.
type Errors struct {
Errors []error `json:"errors,omitempty"`
}
// Push pushes an error on to the error stack, with the optional detail
// argument. It is a programming error (ie panic) to push more than one
// detail at a time.
func (errs *Errors) Push(code ErrorCode, details ...interface{}) {
if len(details) > 1 {
panic("please specify zero or one detail items for this error")
}
var detail interface{}
if len(details) > 0 {
detail = details[0]
}
errs.PushErr(Error{
Code: code,
Message: code.Message(),
Detail: detail,
})
}
// PushErr pushes an error interface onto the error stack.
func (errs *Errors) PushErr(err error) {
errs.Errors = append(errs.Errors, err)
}
func (errs *Errors) Error() string {
switch len(errs.Errors) {
case 0:
return "<nil>"
case 1:
return errs.Errors[0].Error()
default:
msg := "errors:\n"
for _, err := range errs.Errors {
msg += err.Error() + "\n"
}
return msg
}
}
// DetailUnknownLayer provides detail for unknown layer errors, returned by
// image manifest push for layers that are not yet transferred. This intended
// to only be used on the backend to return detail for this specific error.
type DetailUnknownLayer struct {
// Unknown should contain the contents of a layer descriptor, which is a
// single FSLayer currently.
Unknown FSLayer `json:"unknown"`
}
// RepositoryNotFoundError is returned when making an operation against a
// repository that does not exist in the registry.
type RepositoryNotFoundError struct {
Name string
}
func (e *RepositoryNotFoundError) Error() string {
return fmt.Sprintf("No repository found with Name: %s", e.Name)
}
// ImageManifestNotFoundError is returned when making an operation against a
// given image manifest that does not exist in the registry.
type ImageManifestNotFoundError struct {
Name string
Tag string
}
func (e *ImageManifestNotFoundError) Error() string {
return fmt.Sprintf("No manifest found with Name: %s, Tag: %s",
e.Name, e.Tag)
}
// LayerAlreadyExistsError is returned when attempting to create a new layer
// that already exists in the registry.
type LayerAlreadyExistsError struct {
Name string
TarSum string
}
func (e *LayerAlreadyExistsError) Error() string {
return fmt.Sprintf("Layer already found with Name: %s, TarSum: %s",
e.Name, e.TarSum)
}
// LayerNotFoundError is returned when making an operation against a given image
// layer that does not exist in the registry.
type LayerNotFoundError struct {
Name string
TarSum string
}
func (e *LayerNotFoundError) Error() string {
return fmt.Sprintf("No layer found with Name: %s, TarSum: %s",
e.Name, e.TarSum)
}
// LayerUploadNotFoundError is returned when making a layer upload operation
// against an invalid layer upload location url
// This may be the result of using a cancelled, completed, or stale upload
// location.
type LayerUploadNotFoundError struct {
Location string
}
func (e *LayerUploadNotFoundError) Error() string {
return fmt.Sprintf("No layer found upload found at Location: %s",
e.Location)
}
// LayerUploadInvalidRangeError is returned when attempting to upload an image
// layer chunk that is out of order.
// This provides the known LayerSize and LastValidRange which can be used to
// resume the upload.
type LayerUploadInvalidRangeError struct {
Location string
LastValidRange int
LayerSize int
}
func (e *LayerUploadInvalidRangeError) Error() string {
return fmt.Sprintf(
"Invalid range provided for upload at Location: %s. Last Valid Range: %d, Layer Size: %d",
e.Location, e.LastValidRange, e.LayerSize)
}
// UnexpectedHTTPStatusError is returned when an unexpected HTTP status is
// returned when making a registry api call.
type UnexpectedHTTPStatusError struct {
Status string
}
func (e *UnexpectedHTTPStatusError) Error() string {
return fmt.Sprintf("Received unexpected HTTP status: %s", e.Status)
}