Documentation ¶
Overview ¶
Interfaces for database-related operations.
Index ¶
- Constants
- Variables
- func DefaultClusterScopedAttr(obj runtime.Object) (labels.Set, fields.Set, error)
- func DefaultNamespaceScopedAttr(obj runtime.Object) (labels.Set, fields.Set, error)
- func EverythingFunc(runtime.Object) bool
- func FieldIndex(field string) string
- func IsConflict(err error) bool
- func IsInternalError(err error) bool
- func IsInvalidError(err error) bool
- func IsInvalidObj(err error) bool
- func IsNodeExist(err error) bool
- func IsNotFound(err error) bool
- func IsTooLargeResourceVersion(err error) bool
- func IsUnreachable(err error) bool
- func LabelIndex(label string) string
- func NamespaceKeyFunc(prefix string, obj runtime.Object) (string, error)
- func NewTooLargeResourceVersionError(minimumResourceVersion, currentRevision uint64, retrySeconds int) error
- func NoNamespaceKeyFunc(prefix string, obj runtime.Object) (string, error)
- func ValidateAllObjectFunc(ctx context.Context, obj runtime.Object) error
- type AttrFunc
- type FieldMutationFunc
- type HighWaterMark
- type IndexerFunc
- type IndexerFuncs
- type Interface
- type InternalError
- type InvalidError
- type MatchValue
- type Preconditions
- type ResponseMeta
- type SelectionPredicate
- func (s *SelectionPredicate) Empty() bool
- func (s *SelectionPredicate) MatcherIndex() []MatchValue
- func (s *SelectionPredicate) Matches(obj runtime.Object) (bool, error)
- func (s *SelectionPredicate) MatchesObjectAttributes(l labels.Set, f fields.Set) bool
- func (s *SelectionPredicate) MatchesSingle() (string, bool)
- type SimpleUpdateFunc
- type StorageError
- func NewInvalidObjError(key, msg string) *StorageError
- func NewKeyExistsError(key string, rv int64) *StorageError
- func NewKeyNotFoundError(key string, rv int64) *StorageError
- func NewResourceVersionConflictsError(key string, rv int64) *StorageError
- func NewUnreachableError(key string, rv int64) *StorageError
- type UpdateFunc
- type ValidateObjectFunc
- type Versioner
Constants ¶
Variables ¶
var Everything = SelectionPredicate{ Label: labels.Everything(), Field: fields.Everything(), }
Everything accepts all objects.
Functions ¶
func DefaultClusterScopedAttr ¶
func DefaultNamespaceScopedAttr ¶
func IsConflict ¶
IsConflict returns true if and only if err is a write conflict.
func IsInternalError ¶
IsInternalError returns true if and only if err is an InternalError.
func IsInvalidError ¶
IsInvalidError returns true if and only if err is an InvalidError.
func IsInvalidObj ¶
IsInvalidObj returns true if and only if err is invalid error
func IsNodeExist ¶
IsNodeExist returns true if and only if err is an node already exist error.
func IsNotFound ¶
IsNotFound returns true if and only if err is "key" not found error.
func IsTooLargeResourceVersion ¶
IsTooLargeResourceVersion returns true if the error is a TooLargeResourceVersion error.
func IsUnreachable ¶
IsUnreachable returns true if and only if err indicates the server could not be reached.
func NewTooLargeResourceVersionError ¶
func NewTooLargeResourceVersionError(minimumResourceVersion, currentRevision uint64, retrySeconds int) error
NewTooLargeResourceVersionError returns a timeout error with the given retrySeconds for a request for a minimum resource version that is larger than the largest currently available resource version for a requested resource.
func NoNamespaceKeyFunc ¶
Types ¶
type AttrFunc ¶
AttrFunc returns label and field sets and the uninitialized flag for List or Watch to match. In any failure to parse given object, it returns error.
func (AttrFunc) WithFieldMutation ¶
func (f AttrFunc) WithFieldMutation(fieldMutator FieldMutationFunc) AttrFunc
type FieldMutationFunc ¶
FieldMutationFunc allows the mutation of the field selection fields. It is mutating to avoid the extra allocation on this common path
type HighWaterMark ¶
type HighWaterMark int64
HighWaterMark is a thread-safe object for tracking the maximum value seen for some quantity.
func (*HighWaterMark) Update ¶
func (hwm *HighWaterMark) Update(current int64) bool
Update returns true if and only if 'current' is the highest value ever seen.
type IndexerFunc ¶
IndexerFunc is a function that for a given object computes <value of an index> for a particular <index>.
type IndexerFuncs ¶
type IndexerFuncs map[string]IndexerFunc
IndexerFuncs is a mapping from <index name> to function that for a given object computes <value for that index>.
type Interface ¶
type Interface interface { // Returns Versioner associated with this interface. Versioner() Versioner // Create adds a new object at a key unless it already exists. 'ttl' is time-to-live // in seconds (0 means forever). If no error is returned and out is not nil, out will be // set to the read value from database. Create(ctx context.Context, key string, obj, out runtime.Object, ttl uint64) error // Delete removes the specified key and returns the value that existed at that spot. // If key didn't exist, it will return NotFound storage error. Delete(ctx context.Context, key string, out runtime.Object, preconditions *Preconditions, validateDeletion ValidateObjectFunc) error // Watch begins watching the specified key. Events are decoded into API objects, // and any items selected by 'p' are sent down to returned watch.Interface. // resourceVersion may be used to specify what version to begin watching, // which should be the current resourceVersion, and no longer rv+1 // (e.g. reconnecting without missing any updates). // If resource version is "0", this interface will get current object at given key // and send it in an "ADDED" event, before watch starts. Watch(ctx context.Context, key string, resourceVersion string, p SelectionPredicate) (watch.Interface, error) // WatchList begins watching the specified key's items. Items are decoded into API // objects and any item selected by 'p' are sent down to returned watch.Interface. // resourceVersion may be used to specify what version to begin watching, // which should be the current resourceVersion, and no longer rv+1 // (e.g. reconnecting without missing any updates). // If resource version is "0", this interface will list current objects directory defined by key // and send them in "ADDED" events, before watch starts. WatchList(ctx context.Context, key string, resourceVersion string, p SelectionPredicate) (watch.Interface, error) // Get unmarshals json found at key into objPtr. On a not found error, will either // return a zero object of the requested type, or an error, depending on ignoreNotFound. // Treats empty responses and nil response nodes exactly like a not found error. // The returned contents may be delayed, but it is guaranteed that they will // be have at least 'resourceVersion'. Get(ctx context.Context, key string, resourceVersion string, objPtr runtime.Object, ignoreNotFound bool) error // GetToList unmarshals json found at key and opaque it into *List api object // (an object that satisfies the runtime.IsList definition). // The returned contents may be delayed, but it is guaranteed that they will // be have at least 'resourceVersion'. GetToList(ctx context.Context, key string, resourceVersion string, p SelectionPredicate, listObj runtime.Object) error // List unmarshalls jsons found at directory defined by key and opaque them // into *List api object (an object that satisfies runtime.IsList definition). // The returned contents may be delayed, but it is guaranteed that they will // be have at least 'resourceVersion'. List(ctx context.Context, key string, resourceVersion string, p SelectionPredicate, listObj runtime.Object) error // GuaranteedUpdate keeps calling 'tryUpdate()' to update key 'key' (of type 'ptrToType') // retrying the update until success if there is index conflict. // Note that object passed to tryUpdate may change across invocations of tryUpdate() if // other writers are simultaneously updating it, so tryUpdate() needs to take into account // the current contents of the object when deciding how the update object should look. // If the key doesn't exist, it will return NotFound storage error if ignoreNotFound=false // or zero value in 'ptrToType' parameter otherwise. // If the object to update has the same value as previous, it won't do any update // but will return the object in 'ptrToType' parameter. // If 'suggestion' can contain zero or one element - in such case this can be used as // a suggestion about the current version of the object to avoid read operation from // storage to get it. // // Example: // // s := /* implementation of Interface */ // err := s.GuaranteedUpdate( // "myKey", &MyType{}, true, // func(input runtime.Object, res ResponseMeta) (runtime.Object, *uint64, error) { // // Before each invocation of the user defined function, "input" is reset to // // current contents for "myKey" in database. // curr := input.(*MyType) // Guaranteed to succeed. // // // Make the modification // curr.Counter++ // // // Return the modified object - return an error to stop iterating. Return // // a uint64 to alter the TTL on the object, or nil to keep it the same value. // return cur, nil, nil // }, // ) GuaranteedUpdate( ctx context.Context, key string, ptrToType runtime.Object, ignoreNotFound bool, precondtions *Preconditions, tryUpdate UpdateFunc, suggestion ...runtime.Object) error // Count returns number of different entries under the key (generally being path prefix). Count(key string) (int64, error) }
Interface offers a common interface for object marshaling/unmarshaling operations and hides all the storage-related operations behind it.
type InternalError ¶
type InternalError struct {
Reason string
}
InternalError is generated when an error occurs in the storage package, i.e., not from the underlying storage backend (e.g., etcd).
func NewInternalError ¶
func NewInternalError(reason string) InternalError
func NewInternalErrorf ¶
func NewInternalErrorf(format string, a ...interface{}) InternalError
func (InternalError) Error ¶
func (e InternalError) Error() string
type InvalidError ¶
InvalidError is generated when an error caused by invalid API object occurs in the storage package.
func NewInvalidError ¶
func NewInvalidError(errors field.ErrorList) InvalidError
func (InvalidError) Error ¶
func (e InvalidError) Error() string
type MatchValue ¶
MatchValue defines a pair (<index name>, <value for that index>).
type Preconditions ¶
type Preconditions struct { // Specifies the target UID. // +optional UID *types.UID `json:"uid,omitempty"` // Specifies the target ResourceVersion // +optional ResourceVersion *string `json:"resourceVersion,omitempty"` }
Preconditions must be fulfilled before an operation (update, delete, etc.) is carried out.
func NewUIDPreconditions ¶
func NewUIDPreconditions(uid string) *Preconditions
NewUIDPreconditions returns a Preconditions with UID set.
type ResponseMeta ¶
type ResponseMeta struct { // TTL is the time to live of the node that contained the returned object. It may be // zero or negative in some cases (objects may be expired after the requested // expiration time due to server lag). TTL int64 // The resource version of the node that contained the returned object. ResourceVersion uint64 }
ResponseMeta contains information about the database metadata that is associated with an object. It abstracts the actual underlying objects to prevent coupling with concrete database and to improve testability.
type SelectionPredicate ¶
type SelectionPredicate struct { Label labels.Selector Field fields.Selector GetAttrs AttrFunc IndexLabels []string IndexFields []string Limit int64 Continue string AllowWatchBookmarks bool }
SelectionPredicate is used to represent the way to select objects from api storage.
func (*SelectionPredicate) Empty ¶
func (s *SelectionPredicate) Empty() bool
Empty returns true if the predicate performs no filtering.
func (*SelectionPredicate) MatcherIndex ¶
func (s *SelectionPredicate) MatcherIndex() []MatchValue
For any index defined by IndexFields, if a matcher can match only (a subset) of objects that return <value> for a given index, a pair (<index name>, <value>) wil be returned.
func (*SelectionPredicate) Matches ¶
func (s *SelectionPredicate) Matches(obj runtime.Object) (bool, error)
Matches returns true if the given object's labels and fields (as returned by s.GetAttrs) match s.Label and s.Field. An error is returned if s.GetAttrs fails.
func (*SelectionPredicate) MatchesObjectAttributes ¶
MatchesObjectAttributes returns true if the given labels and fields match s.Label and s.Field.
func (*SelectionPredicate) MatchesSingle ¶
func (s *SelectionPredicate) MatchesSingle() (string, bool)
MatchesSingle will return (name, true) if and only if s.Field matches on the object's name.
type StorageError ¶
func NewInvalidObjError ¶
func NewInvalidObjError(key, msg string) *StorageError
func NewKeyExistsError ¶
func NewKeyExistsError(key string, rv int64) *StorageError
func NewKeyNotFoundError ¶
func NewKeyNotFoundError(key string, rv int64) *StorageError
func NewResourceVersionConflictsError ¶
func NewResourceVersionConflictsError(key string, rv int64) *StorageError
func NewUnreachableError ¶
func NewUnreachableError(key string, rv int64) *StorageError
func (*StorageError) Error ¶
func (e *StorageError) Error() string
type UpdateFunc ¶
type UpdateFunc func(input runtime.Object, res ResponseMeta) (output runtime.Object, ttl *uint64, err error)
Pass an UpdateFunc to Interface.GuaranteedUpdate to make an update that is guaranteed to succeed. See the comment for GuaranteedUpdate for more details.
func SimpleUpdate ¶
func SimpleUpdate(fn SimpleUpdateFunc) UpdateFunc
SimpleUpdateFunc converts SimpleUpdateFunc into UpdateFunc
type ValidateObjectFunc ¶
ValidateObjectFunc is a function to act on a given object. An error may be returned if the hook cannot be completed. The function may NOT transform the provided object.
type Versioner ¶
type Versioner interface { // UpdateObject sets storage metadata into an API object. Returns an error if the object // cannot be updated correctly. May return nil if the requested object does not need metadata // from database. UpdateObject(obj runtime.Object, resourceVersion uint64) error // UpdateList sets the resource version into an API list object. Returns an error if the object // cannot be updated correctly. May return nil if the requested object does not need metadata from // database. continueValue is optional and indicates that more results are available if the client // passes that value to the server in a subsequent call. remainingItemCount indicates the number // of remaining objects if the list is partial. The remainingItemCount field is omitted during // serialization if it is set to nil. UpdateList(obj runtime.Object, resourceVersion uint64, continueValue string, remainingItemCount *int64) error // PrepareObjectForStorage should set SelfLink and ResourceVersion to the empty value. Should // return an error if the specified object cannot be updated. PrepareObjectForStorage(obj runtime.Object) error // ObjectResourceVersion returns the resource version (for persistence) of the specified object. // Should return an error if the specified object does not have a persistable version. ObjectResourceVersion(obj runtime.Object) (uint64, error) // ParseResourceVersion takes a resource version argument and // converts it to the storage backend. For watch we should pass to helper.Watch(). // Because resourceVersion is an opaque value, the default watch // behavior for non-zero watch is to watch the next value (if you pass // "1", you will see updates from "2" onwards). ParseResourceVersion(resourceVersion string) (uint64, error) }
Versioner abstracts setting and retrieving metadata fields from database response onto the object ot list. It is required to maintain storage invariants - updating an object twice with the same data except for the ResourceVersion and SelfLink must be a no-op. A resourceVersion of type uint64 is a 'raw' resourceVersion, intended to be sent directly to or from the backend. A resourceVersion of type string is a 'safe' resourceVersion, intended for consumption by users.
Directories ¶
Path | Synopsis |
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Package storage provides conversion of storage errors to API errors.
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Package storage provides conversion of storage errors to API errors. |
Package value contains methods for assisting with transformation of values in storage.
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Package value contains methods for assisting with transformation of values in storage. |
encrypt/aes
Package aes transforms values for storage at rest using AES-GCM.
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Package aes transforms values for storage at rest using AES-GCM. |
encrypt/envelope
Package envelope transforms values for storage at rest using a Envelope provider
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Package envelope transforms values for storage at rest using a Envelope provider |
encrypt/envelope/v1beta1
Package v1beta1 contains definition of kms-plugin's gRPC service.
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Package v1beta1 contains definition of kms-plugin's gRPC service. |
encrypt/secretbox
Package secretbox transforms values for storage at rest using XSalsa20 and Poly1305.
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Package secretbox transforms values for storage at rest using XSalsa20 and Poly1305. |