Move ErrorCode logic to new errcode package
Make HTTP status codes match the ErrorCode by looking it up in the Descriptors Signed-off-by: Doug Davis <dug@us.ibm.com>
This commit is contained in:
Doug Davis
parent
5f553b3cfc
commit
f565d6abb7
16 changed files with 444 additions and 405 deletions
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@ -1,20 +1,14 @@
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package v2
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import (
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"fmt"
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"strings"
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"net/http"
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"github.com/docker/distribution/registry/api/errcode"
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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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const (
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// ErrorCodeUnknown is a catch-all for errors not defined below.
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ErrorCodeUnknown ErrorCode = iota
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// ErrorCodeUnsupported is returned when an operation is not supported.
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ErrorCodeUnsupported
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ErrorCodeUnsupported = iota
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// ErrorCodeUnauthorized is returned if a request is not authorized.
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ErrorCodeUnauthorized
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@ -50,6 +44,10 @@ const (
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// signature verfication.
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ErrorCodeManifestUnverified
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// ErrorCodeManifestBlobUnknown is returned when a manifest blob is
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// unknown to the registry.
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ErrorCodeManifestBlobUnknown
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// ErrorCodeBlobUnknown is returned when a blob is unknown to the
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// registry. This can happen when the manifest references a nonexistent
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// layer or the result is not found by a blob fetch.
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@ -62,133 +60,133 @@ const (
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ErrorCodeBlobUploadInvalid
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)
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// ParseErrorCode attempts to parse the error code string, returning
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// ErrorCodeUnknown if the error is not known.
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func ParseErrorCode(s string) ErrorCode {
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desc, ok := idToDescriptors[s]
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// ErrorDescriptors provides a list of HTTP API Error codes that may be
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// encountered when interacting with the registry API.
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var errorDescriptors = []errcode.ErrorDescriptor{
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{
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Code: ErrorCodeUnsupported,
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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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implementation or invalid set of parameters.`,
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},
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{
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Code: ErrorCodeUnauthorized,
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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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a resource. Often this will be accompanied by a 401 Unauthorized
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response status.`,
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HTTPStatusCode: http.StatusForbidden,
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},
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{
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Code: ErrorCodeDigestInvalid,
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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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the content matches the digest provided by the client. The error may
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include a detail structure with the key "digest", including the
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invalid digest string. This error may also be returned when a manifest
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includes an invalid layer digest.`,
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HTTPStatusCode: http.StatusBadRequest,
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},
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{
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Code: ErrorCodeSizeInvalid,
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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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checked against the uploaded content. If they do not match, this error
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will be returned.`,
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HTTPStatusCode: http.StatusBadRequest,
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},
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{
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Code: ErrorCodeNameInvalid,
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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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manifest validation or any API operation.`,
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HTTPStatusCode: http.StatusBadRequest,
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},
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{
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Code: ErrorCodeTagInvalid,
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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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does not match the uri tag, this error will be returned.`,
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HTTPStatusCode: http.StatusBadRequest,
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},
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{
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Code: ErrorCodeNameUnknown,
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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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unknown to the registry.`,
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HTTPStatusCode: http.StatusNotFound,
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},
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{
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Code: ErrorCodeManifestUnknown,
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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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name and tag is unknown to the repository.`,
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HTTPStatusCode: http.StatusNotFound,
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},
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{
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Code: ErrorCodeManifestInvalid,
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Value: "MANIFEST_INVALID",
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Message: "manifest invalid",
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Description: `During upload, manifests undergo several checks ensuring
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validity. If those checks fail, this error may be returned, unless a
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more specific error is included. The detail will contain information
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the failed validation.`,
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HTTPStatusCode: http.StatusBadRequest,
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},
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{
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Code: ErrorCodeManifestUnverified,
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Value: "MANIFEST_UNVERIFIED",
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Message: "manifest failed signature verification",
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Description: `During manifest upload, if the manifest fails signature
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verification, this error will be returned.`,
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HTTPStatusCode: http.StatusBadRequest,
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},
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{
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Code: ErrorCodeManifestBlobUnknown,
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Value: "MANIFEST_BLOB_UNKNOWN",
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Message: "blob unknown to registry",
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Description: `This error may be returned when a manifest blob is
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unknown to the registry.`,
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HTTPStatusCode: http.StatusBadRequest,
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},
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{
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Code: ErrorCodeBlobUnknown,
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Value: "BLOB_UNKNOWN",
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Message: "blob unknown to registry",
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Description: `This error may be returned when a blob is unknown to the
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registry in a specified repository. This can be returned with a
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standard get or if a manifest references an unknown layer during
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upload.`,
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HTTPStatusCode: http.StatusNotFound,
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},
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if !ok {
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return ErrorCodeUnknown
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}
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return desc.Code
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{
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Code: ErrorCodeBlobUploadUnknown,
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Value: "BLOB_UPLOAD_UNKNOWN",
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Message: "blob upload unknown to registry",
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Description: `If a blob upload has been cancelled or was never
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started, this error code may be returned.`,
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HTTPStatusCode: http.StatusNotFound,
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},
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{
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Code: ErrorCodeBlobUploadInvalid,
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Value: "BLOB_UPLOAD_INVALID",
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Message: "blob upload invalid",
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Description: `The blob upload encountered an error and can no
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longer proceed.`,
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HTTPStatusCode: http.StatusNotFound,
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},
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}
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// Descriptor returns the descriptor for the error code.
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func (ec ErrorCode) Descriptor() ErrorDescriptor {
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d, ok := errorCodeToDescriptors[ec]
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if !ok {
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return ErrorCodeUnknown.Descriptor()
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}
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return d
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}
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// String returns the canonical identifier for this error code.
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func (ec ErrorCode) String() string {
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return ec.Descriptor().Value
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}
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// Message returned the human-readable error message for this error code.
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func (ec ErrorCode) Message() string {
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return ec.Descriptor().Message
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}
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// MarshalText encodes the receiver into UTF-8-encoded text and returns the
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// result.
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func (ec ErrorCode) MarshalText() (text []byte, err error) {
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return []byte(ec.String()), nil
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}
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// UnmarshalText decodes the form generated by MarshalText.
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func (ec *ErrorCode) UnmarshalText(text []byte) error {
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desc, ok := idToDescriptors[string(text)]
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if !ok {
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desc = ErrorCodeUnknown.Descriptor()
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}
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*ec = desc.Code
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return nil
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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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Message string `json:"message,omitempty"`
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Detail interface{} `json:"detail,omitempty"`
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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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strings.ToLower(strings.Replace(e.Code.String(), "_", " ", -1)),
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e.Message)
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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 struct {
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Errors []Error `json:"errors,omitempty"`
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}
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// Push pushes an error on to the error stack, with the optional detail
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// argument. It is a programming error (ie panic) to push more than one
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// detail at a time.
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func (errs *Errors) Push(code ErrorCode, details ...interface{}) {
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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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errs.PushErr(Error{
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Code: code,
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Message: code.Message(),
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Detail: detail,
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})
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}
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// PushErr pushes an error interface onto the error stack.
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func (errs *Errors) PushErr(err error) {
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switch err.(type) {
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case Error:
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errs.Errors = append(errs.Errors, err.(Error))
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default:
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errs.Errors = append(errs.Errors, Error{Message: err.Error()})
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}
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}
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func (errs *Errors) Error() string {
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switch errs.Len() {
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case 0:
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return "<nil>"
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case 1:
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return errs.Errors[0].Error()
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default:
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msg := "errors:\n"
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for _, err := range errs.Errors {
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msg += err.Error() + "\n"
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}
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return msg
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}
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}
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// Clear clears the errors.
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func (errs *Errors) Clear() {
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errs.Errors = errs.Errors[:0]
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}
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// Len returns the current number of errors.
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func (errs *Errors) Len() int {
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return len(errs.Errors)
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// init registers our errors with the errcode system
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func init() {
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errcode.LoadErrors(&errorDescriptors)
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}
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