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 Go to latest Published: Apr 1, 2021 License: Apache-2.0 Imports: 31 Imported by: 0

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Index

Constants

View Source 
const WALPrefix = "wal/"

WALPrefix is the prefix within Storage where WAL entries will be written.

Variables

View Source 
var OASStdRespNoContent = &OASResponse{
	Description: "empty body",
}
View Source 
var OASStdRespOK = &OASResponse{
	Description: "OK",
}

Functions

func CalculateTTL 

func CalculateTTL(sysView logical.SystemView, increment, backendTTL, period, backendMaxTTL, explicitMaxTTL time.Duration, startTime time.Time) (ttl time.Duration, warnings []string, errors error)

CalculateTTL takes all the user-specified, backend, and system inputs and calculates a TTL for a lease

func DeleteWAL 

func DeleteWAL(ctx context.Context, s logical.Storage, id string) error

DeleteWAL commits the WAL entry with the given ID. Once committed, it is assumed that the operation was a success and doesn't need to be rolled back.

func GenericNameRegex 

func GenericNameRegex(name string) string

Helper which returns a generic regex string for creating endpoint patterns that are identified by the given name in the backends

func GenericNameWithAtRegex 

func GenericNameWithAtRegex(name string) string

GenericNameWithAtRegex returns a generic regex that allows alphanumeric characters along with -, . and @.

func ListWAL 

func ListWAL(ctx context.Context, s logical.Storage) ([]string, error)

ListWAL lists all the entries in the WAL.

func MatchAllRegex 

func MatchAllRegex(name string) string

Helper which returns a regex string for capturing an entire endpoint path as the given name.

func OptionalParamRegex 

func OptionalParamRegex(name string) string

Helper which returns a regex string for optionally accepting the a field from the API URL

func PutWAL 

func PutWAL(ctx context.Context, s logical.Storage, kind string, data interface{}) (string, error)

PutWAL writes some data to the WAL.

The kind parameter is used by the framework to allow users to store multiple kinds of WAL data and to easily disambiguate what data they're expecting.

Data within the WAL that is uncommitted (CommitWAL hasn't be called) will be given to the rollback callback when an rollback operation is received, allowing the backend to clean up some partial states.

The data must be JSON encodable.

This returns a unique ID that can be used to reference this WAL data. WAL data cannot be modified. You can only add to the WAL and commit existing WAL entries.

Types

type Backend 

type Backend struct {
	// Help is the help text that is shown when a help request is made
	// on the root of this resource. The root help is special since we
	// show all the paths that can be requested.
	Help string

	// Paths are the various routes that the backend responds to.
	// This cannot be modified after construction (i.e. dynamically changing
	// paths, including adding or removing, is not allowed once the
	// backend is in use).
	//
	// PathsSpecial is the list of path patterns that denote the
	// paths above that require special privileges. These can't be
	// regular expressions, it is either exact match or prefix match.
	// For prefix match, append '*' as a suffix.
	Paths        []*Path
	PathsSpecial *logical.Paths

	// Secrets is the list of secret types that this backend can
	// return. It is used to automatically generate proper responses,
	// and ease specifying callbacks for revocation, renewal, etc.
	Secrets []*Secret

	// PeriodicFunc is the callback, which if set, will be invoked when the
	// periodic timer of RollbackManager ticks. This can be used by
	// backends to do anything it wishes to do periodically.
	//
	// PeriodicFunc can be invoked to, say to periodically delete stale
	// entries in backend's storage, while the backend is still being used.
	// (Note the different of this action from what `Clean` does, which is
	// invoked just before the backend is unmounted).
	PeriodicFunc periodicFunc

	// WALRollback is called when a WAL entry (see wal.go) has to be rolled
	// back. It is called with the data from the entry.
	//
	// WALRollbackMinAge is the minimum age of a WAL entry before it is attempted
	// to be rolled back. This should be longer than the maximum time it takes
	// to successfully create a secret.
	WALRollback       WALRollbackFunc
	WALRollbackMinAge time.Duration

	// Clean is called on unload to clean up e.g any existing connections
	// to the backend, if required.
	Clean CleanupFunc

	// Invalidate is called when a keys is modified if required
	Invalidate InvalidateFunc

	// AuthRenew is the callback to call when a RenewRequest for an
	// authentication comes in. By default, renewal won't be allowed.
	// See the built-in AuthRenew helpers in lease.go for common callbacks.
	AuthRenew OperationFunc

	// Type is the logical.BackendType for the backend implementation
	BackendType logical.BackendType
	// contains filtered or unexported fields
}

Backend is an implementation of logical.Backend that allows the implementer to code a backend using a much more programmer-friendly framework that handles a lot of the routing and validation for you.

This is recommended over implementing logical.Backend directly.

func (*Backend) Cleanup 

func (b *Backend) Cleanup(ctx context.Context)

Cleanup is used to release resources and prepare to stop the backend

func (*Backend) HandleExistenceCheck 

func (b *Backend) HandleExistenceCheck(ctx context.Context, req *logical.Request) (checkFound bool, exists bool, err error)

HandleExistenceCheck is the logical.Backend implementation.

func (*Backend) HandleRequest 

func (b *Backend) HandleRequest(ctx context.Context, req *logical.Request) (*logical.Response, error)

HandleRequest is the logical.Backend implementation.

func (*Backend) InvalidateKey 

func (b *Backend) InvalidateKey(ctx context.Context, key string)

InvalidateKey is used to clear caches and reset internal state on key changes

func (*Backend) Logger 

func (b *Backend) Logger() log.Logger

Logger can be used to get the logger. If no logger has been set, the logs will be discarded.

func (*Backend) Route 

func (b *Backend) Route(path string) *Path

Route looks up the path that would be used for a given path string.

func (*Backend) Secret 

func (b *Backend) Secret(k string) *Secret

Secret is used to look up the secret with the given type.

func (*Backend) Setup 

func (b *Backend) Setup(ctx context.Context, config *logical.BackendConfig) error

Setup is used to initialize the backend with the initial backend configuration

func (*Backend) SpecialPaths 

func (b *Backend) SpecialPaths() *logical.Paths

SpecialPaths is the logical.Backend implementation.

func (*Backend) System 

func (b *Backend) System() logical.SystemView

System returns the backend's system view.

func (*Backend) Type 

func (b *Backend) Type() logical.BackendType

Type returns the backend type

type CleanupFunc 

type CleanupFunc func(context.Context)

CleanupFunc is the callback for backend unload.

type ExistenceFunc 

type ExistenceFunc func(context.Context, *logical.Request, *FieldData) (bool, error)

ExistenceFunc is the callback called for an existence check on a path.

type FieldData 

type FieldData struct {
	Raw    map[string]interface{}
	Schema map[string]*FieldSchema
}

FieldData is the structure passed to the callback to handle a path containing the populated parameters for fields. This should be used instead of the raw (*vault.Request).Data to access data in a type-safe way.

func (*FieldData) Get 

func (d *FieldData) Get(k string) interface{}

Get gets the value for the given field. If the key is an invalid field, FieldData will panic. If you want a safer version of this method, use GetOk. If the field k is not set, the default value (if set) will be returned, otherwise the zero value will be returned.

func (*FieldData) GetDefaultOrZero 

func (d *FieldData) GetDefaultOrZero(k string) interface{}

GetDefaultOrZero gets the default value set on the schema for the given field. If there is no default value set, the zero value of the type will be returned.

func (*FieldData) GetFirst 

func (d *FieldData) GetFirst(k ...string) (interface{}, bool)

GetFirst gets the value for the given field names, in order from first to last. This can be useful for fields with a current name, and one or more deprecated names. The second return value will be false if the keys are invalid or the keys are not set at all.

func (*FieldData) GetOk 

func (d *FieldData) GetOk(k string) (interface{}, bool)

GetOk gets the value for the given field. The second return value will be false if the key is invalid or the key is not set at all. If the field k is set and the decoded value is nil, the default or zero value will be returned instead.

func (*FieldData) GetOkErr 

func (d *FieldData) GetOkErr(k string) (interface{}, bool, error)

GetOkErr is the most conservative of all the Get methods. It returns whether key is set or not, but also an error value. The error value is non-nil if the field doesn't exist or there was an error parsing the field value.

func (*FieldData) Validate 

func (d *FieldData) Validate() error

Validate cycles through raw data and validate conversions in the schema, so we don't get an error/panic later when trying to get data out. Data not in the schema is not an error at this point, so we don't worry about it.

type FieldSchema 

type FieldSchema struct {
	Type        FieldType
	Default     interface{}
	Description string
	Required    bool
	Deprecated  bool

	// Query indicates this field will be sent as a query parameter:
	//
	//   /v1/foo/bar?some_param=some_value
	//
	// It doesn't affect handling of the value, but may be used for documentation.
	Query bool

	// AllowedValues is an optional list of permitted values for this field.
	// This constraint is not (yet) enforced by the framework, but the list is
	// output as part of OpenAPI generation and may effect documentation and
	// dynamic UI generation.
	AllowedValues []interface{}

	// DisplayName is the name of the field suitable as a label or documentation heading.
	DisplayName string

	// DisplayValue is a sample value to display for this field. This may be used
	// to indicate a default value, but it is for display only and completely separate
	// from any Default member handling.
	DisplayValue interface{}

	// DisplaySensitive indicates that the value should be masked by default in the UI.
	DisplaySensitive bool
}

FieldSchema is a basic schema to describe the format of a path field.

func (*FieldSchema) DefaultOrZero 

func (s *FieldSchema) DefaultOrZero() interface{}

DefaultOrZero returns the default value if it is set, or otherwise the zero value of the type.

type FieldType 

type FieldType uint

FieldType is the enum of types that a field can be. 

const (
	TypeInvalid FieldType = 0
	TypeString  FieldType = iota
	TypeInt
	TypeBool
	TypeMap

	// TypeDurationSecond represent as seconds, this can be either an
	// integer or go duration format string (e.g. 24h)
	TypeDurationSecond

	// TypeSlice represents a slice of any type
	TypeSlice

	// TypeStringSlice is a helper for TypeSlice that returns a sanitized
	// slice of strings
	TypeStringSlice

	// TypeCommaStringSlice is a helper for TypeSlice that returns a sanitized
	// slice of strings and also supports parsing a comma-separated list in
	// a string field
	TypeCommaStringSlice

	// TypeLowerCaseString is a helper for TypeString that returns a lowercase
	// version of the provided string
	TypeLowerCaseString

	// TypeNameString represents a name that is URI safe and follows specific
	// rules.  These rules include start and end with an alphanumeric
	// character and characters in the middle can be alphanumeric or . or -.
	TypeNameString

	// TypeKVPairs allows you to represent the data as a map or a list of
	// equal sign delimited key pairs
	TypeKVPairs

	// TypeCommaIntSlice is a helper for TypeSlice that returns a sanitized
	// slice of Ints
	TypeCommaIntSlice

	// TypeHeader is a helper for sending request headers through to Vault.
	// For instance, the AWS and AliCloud credential plugins both act as a
	// benevolent MITM for a request, and the headers are sent through and
	// parsed.
	TypeHeader
)

func (FieldType) String 

func (t FieldType) String() string

func (FieldType) Zero 

func (t FieldType) Zero() interface{}

Zero returns the correct zero-value for a specific FieldType

type InvalidateFunc 

type InvalidateFunc func(context.Context, string)

InvalidateFunc is the callback for backend key invalidation.

type OASContent 

type OASContent map[string]*OASMediaTypeObject

type OASDocument 

type OASDocument struct {
	Version     string                  `json:"version" mapstructure:"version"`
	Title       string                  `json:"title"`
	Description string                  `json:"description"`
	Paths       map[string]*OASPathItem `json:"paths"`
}

func NewOASDocument 

func NewOASDocument() *OASDocument

NewOASDocument returns an empty OpenAPI document.

func NewOASDocumentFromMap 

func NewOASDocumentFromMap(input map[string]interface{}) (*OASDocument, error)

NewOASDocumentFromMap builds an OASDocument from an existing map version of a document. If a document has been decoded from JSON or received from a plugin, it will be as a map[string]interface{} and needs special handling beyond the default mapstructure decoding.

func (*OASDocument) CreateOperationIDs 

func (d *OASDocument) CreateOperationIDs(context string)

CreateOperationIDs generates unique operationIds for all paths/methods. The transform will convert path/method into camelcase. e.g.:

/sys/tools/random/{urlbytes} -> postSysToolsRandomUrlbytes

In the unlikely case of a duplicate ids, a numeric suffix is added: 

postSysToolsRandomUrlbytes_2

An optional user-provided suffix ("context") may also be appended.

type OASMediaTypeObject 

type OASMediaTypeObject struct {
	Schema *OASSchema `json:"schema,omitempty"`
}

type OASOperation 

type OASOperation struct {
	Summary     string               `json:"summary,omitempty"`
	Description string               `json:"description,omitempty"`
	OperationID string               `json:"operationId,omitempty"`
	Tags        []string             `json:"tags,omitempty"`
	Parameters  []OASParameter       `json:"parameters,omitempty"`
	RequestBody *OASRequestBody      `json:"requestBody,omitempty"`
	Responses   map[int]*OASResponse `json:"responses"`
	Deprecated  bool                 `json:"deprecated,omitempty"`
}

func NewOASOperation 

func NewOASOperation() *OASOperation

NewOASOperation creates an empty OpenAPI Operations object.

type OASParameter 

type OASParameter struct {
	Name        string     `json:"name"`
	Description string     `json:"description,omitempty"`
	In          string     `json:"in"`
	Schema      *OASSchema `json:"schema,omitempty"`
	Required    bool       `json:"required,omitempty"`
	Deprecated  bool       `json:"deprecated,omitempty"`
}

type OASPathItem 

type OASPathItem struct {
	Description     string         `json:"description,omitempty"`
	Parameters      []OASParameter `json:"parameters,omitempty"`
	Sudo            bool           `json:"x-vault-sudo,omitempty" mapstructure:"x-vault-sudo"`
	Unauthenticated bool           `json:"x-vault-unauthenticated,omitempty" mapstructure:"x-vault-unauthenticated"`
	CreateSupported bool           `json:"x-vault-createSupported,omitempty" mapstructure:"x-vault-createSupported"`

	Get    *OASOperation `json:"get,omitempty"`
	Post   *OASOperation `json:"post,omitempty"`
	Delete *OASOperation `json:"delete,omitempty"`
}

type OASRequestBody 

type OASRequestBody struct {
	Description string     `json:"description,omitempty"`
	Content     OASContent `json:"content,omitempty"`
}

type OASResponse 

type OASResponse struct {
	Description string     `json:"description"`
	Content     OASContent `json:"content,omitempty"`
}

type OASSchema 

type OASSchema struct {
	Type        string                `json:"type,omitempty"`
	Description string                `json:"description,omitempty"`
	Properties  map[string]*OASSchema `json:"properties,omitempty"`

	// Required is a list of keys in Properties that are required to be present. This is a different
	// approach than OASParameter (unfortunately), but is how JSONSchema handles 'required'.
	Required []string `json:"required,omitempty"`

	Items            *OASSchema    `json:"items,omitempty"`
	Format           string        `json:"format,omitempty"`
	Pattern          string        `json:"pattern,omitempty"`
	Enum             []interface{} `json:"enum,omitempty"`
	Default          interface{}   `json:"default,omitempty"`
	Example          interface{}   `json:"example,omitempty"`
	Deprecated       bool          `json:"deprecated,omitempty"`
	DisplayName      string        `json:"x-vault-displayName,omitempty" mapstructure:"x-vault-displayName,omitempty"`
	DisplayValue     interface{}   `json:"x-vault-displayValue,omitempty" mapstructure:"x-vault-displayValue,omitempty"`
	DisplaySensitive bool          `json:"x-vault-displaySensitive,omitempty" mapstructure:"x-vault-displaySensitive,omitempty"`
}

type OperationFunc 

type OperationFunc func(context.Context, *logical.Request, *FieldData) (*logical.Response, error)

OperationFunc is the callback called for an operation on a path.

func LeaseExtend 

func LeaseExtend(backendIncrement, backendMax time.Duration) OperationFunc

LeaseExtend is left for backwards compatibility for plugins. This function now just passes back the data that was passed into it to be processed in core. DEPRECATED

type OperationHandler 

type OperationHandler interface {
	Handler() OperationFunc
	Properties() OperationProperties
}

OperationHandler defines and describes a specific operation handler.

type OperationProperties 

type OperationProperties struct {
	// Summary is a brief (usually one line) description of the operation.
	Summary string

	// Description is extended documentation of the operation and may contain
	// Markdown-formatted text markup.
	Description string

	// Examples provides samples of the expected request data. The most
	// relevant example should be first in the list, as it will be shown in
	// documentation that supports only a single example.
	Examples []RequestExample

	// Responses provides a list of response description for a given response
	// code. The most relevant response should be first in the list, as it will
	// be shown in documentation that only allows a single example.
	Responses map[int][]Response

	// Unpublished indicates that this operation should not appear in public
	// documentation or help text. The operation may still have documentation
	// attached that can be used internally.
	Unpublished bool

	// Deprecated indicates that this operation should be avoided.
	Deprecated bool
}

OperationProperties describes an operation for documentation, help text, and other clients. A Summary should always be provided, whereas other fields can be populated as needed.

type Path 

type Path struct {
	// Pattern is the pattern of the URL that matches this path.
	//
	// This should be a valid regular expression. Named captures will be
	// exposed as fields that should map to a schema in Fields. If a named
	// capture is not a field in the Fields map, then it will be ignored.
	Pattern string

	// Fields is the mapping of data fields to a schema describing that
	// field. Named captures in the Pattern also map to fields. If a named
	// capture name matches a PUT body name, the named capture takes
	// priority.
	//
	// Note that only named capture fields are available in every operation,
	// whereas all fields are available in the Write operation.
	Fields map[string]*FieldSchema

	// Operations is the set of operations supported and the associated OperationsHandler.
	//
	// If both Create and Update operations are present, documentation and examples from
	// the Update definition will be used. Similarly if both Read and List are present,
	// Read will be used for documentation.
	Operations map[logical.Operation]OperationHandler

	// Callbacks are the set of callbacks that are called for a given
	// operation. If a callback for a specific operation is not present,
	// then logical.ErrUnsupportedOperation is automatically generated.
	//
	// The help operation is the only operation that the Path will
	// automatically handle if the Help field is set. If both the Help
	// field is set and there is a callback registered here, then the
	// callback will be called.
	//
	// Operations should be used instead and will take priority if present.
	Callbacks map[logical.Operation]OperationFunc

	// ExistenceCheck, if implemented, is used to query whether a given
	// resource exists or not. This is used for ACL purposes: if an Update
	// action is specified, and the existence check returns false, the action
	// is not allowed since the resource must first be created. The reverse is
	// also true. If not specified, the Update action is forced and the user
	// must have UpdateCapability on the path.
	ExistenceCheck ExistenceFunc

	// Deprecated denotes that this path is considered deprecated. This may
	// be reflected in help and documentation.
	Deprecated bool

	// Help is text describing how to use this path. This will be used
	// to auto-generate the help operation. The Path will automatically
	// generate a parameter listing and URL structure based on the
	// regular expression, so the help text should just contain a description
	// of what happens.
	//
	// HelpSynopsis is a one-sentence description of the path. This will
	// be automatically line-wrapped at 80 characters.
	//
	// HelpDescription is a long-form description of the path. This will
	// be automatically line-wrapped at 80 characters.
	HelpSynopsis    string
	HelpDescription string
}

Path is a single path that the backend responds to.

func PathAppend 

func PathAppend(paths ...[]*Path) []*Path

PathAppend is a helper for appending lists of paths into a single list.

type PathMap 

type PathMap struct {
	Prefix        string
	Name          string
	Schema        map[string]*FieldSchema
	CaseSensitive bool
	Salt          *saltpkg.Salt
	SaltFunc      func(context.Context) (*saltpkg.Salt, error)
	// contains filtered or unexported fields
}

PathMap can be used to generate a path that stores mappings in the storage. It is a structure that also exports functions for querying the mappings.

The primary use case for this is for credential providers to do their mapping to policies.

func (*PathMap) Delete 

func (p *PathMap) Delete(ctx context.Context, s logical.Storage, k string) error

Delete removes a value from the mapping

func (*PathMap) Get 

func (p *PathMap) Get(ctx context.Context, s logical.Storage, k string) (map[string]interface{}, error)

Get reads a value out of the mapping

func (*PathMap) List 

func (p *PathMap) List(ctx context.Context, s logical.Storage, prefix string) ([]string, error)

List reads the keys under a given path

func (*PathMap) Paths 

func (p *PathMap) Paths() []*Path

Paths are the paths to append to the Backend paths.

func (*PathMap) Put 

func (p *PathMap) Put(ctx context.Context, s logical.Storage, k string, v map[string]interface{}) error

Put writes a value into the mapping

type PathOperation 

type PathOperation struct {
	Callback    OperationFunc
	Summary     string
	Description string
	Examples    []RequestExample
	Responses   map[int][]Response
	Unpublished bool
	Deprecated  bool
}

PathOperation is a concrete implementation of OperationHandler.

func (*PathOperation) Handler 

func (p *PathOperation) Handler() OperationFunc

func (*PathOperation) Properties 

func (p *PathOperation) Properties() OperationProperties

type PathStruct 

type PathStruct struct {
	Name            string
	Path            string
	Schema          map[string]*FieldSchema
	HelpSynopsis    string
	HelpDescription string

	Read bool
}

PathStruct can be used to generate a path that stores a struct in the storage. This structure is a map[string]interface{} but the types are set according to the schema in this structure.

func (*PathStruct) Delete 

func (p *PathStruct) Delete(ctx context.Context, s logical.Storage) error

Delete removes the structure.

func (*PathStruct) Get 

func (p *PathStruct) Get(ctx context.Context, s logical.Storage) (map[string]interface{}, error)

Get reads the structure.

func (*PathStruct) Paths 

func (p *PathStruct) Paths() []*Path

Paths are the paths to append to the Backend paths.

func (*PathStruct) Put 

func (p *PathStruct) Put(ctx context.Context, s logical.Storage, v map[string]interface{}) error

Put writes the structure.

type PolicyMap 

type PolicyMap struct {
	PathMap

	DefaultKey string
	PolicyKey  string
}

PolicyMap is a specialization of PathMap that expects the values to be lists of policies. This assists in querying and loading policies from the PathMap.

func (*PolicyMap) Policies 

func (p *PolicyMap) Policies(ctx context.Context, s logical.Storage, names ...string) ([]string, error)

type RequestExample 

type RequestExample struct {
	Description string                 // optional description of the request
	Data        map[string]interface{} // map version of sample JSON request data

	// Optional example response to the sample request. This approach is considered
	// provisional for now, and this field may be changed or removed.
	Response *Response
}

RequestExample is example of request data.

type Response 

type Response struct {
	Description string            // summary of the the response and should always be provided
	MediaType   string            // media type of the response, defaulting to "application/json" if empty
	Example     *logical.Response // example response data
}

Response describes and optional demonstrations an operation response.

type Secret 

type Secret struct {
	// Type is the name of this secret type. This is used to setup the
	// vault ID and to look up the proper secret structure when revocation/
	// renewal happens. Once this is set this should not be changed.
	//
	// The format of this must match (case insensitive): ^a-Z0-9_$
	Type string

	// Fields is the mapping of data fields and schema that comprise
	// the structure of this secret.
	Fields map[string]*FieldSchema

	// DefaultDuration is the default value for the duration of the lease for
	// this secret. This can be manually overwritten with the result of
	// Response().
	//
	// If these aren't set, Vault core will set a default lease period which
	// may come from a mount tuning.
	DefaultDuration time.Duration

	// Renew is the callback called to renew this secret. If Renew is
	// not specified then renewable is set to false in the secret.
	// See lease.go for helpers for this value.
	Renew OperationFunc

	// Revoke is the callback called to revoke this secret. This is required.
	Revoke OperationFunc
}

Secret is a type of secret that can be returned from a backend.

func (*Secret) HandleRenew 

func (s *Secret) HandleRenew(ctx context.Context, req *logical.Request) (*logical.Response, error)

HandleRenew is the request handler for renewing this secret.

func (*Secret) HandleRevoke 

func (s *Secret) HandleRevoke(ctx context.Context, req *logical.Request) (*logical.Response, error)

HandleRevoke is the request handler for revoking this secret.

func (*Secret) Renewable 

func (s *Secret) Renewable() bool

func (*Secret) Response 

func (s *Secret) Response(
	data, internal map[string]interface{}) *logical.Response

type WALEntry 

type WALEntry struct {
	ID        string      `json:"-"`
	Kind      string      `json:"type"`
	Data      interface{} `json:"data"`
	CreatedAt int64       `json:"created_at"`
}

func GetWAL 

func GetWAL(ctx context.Context, s logical.Storage, id string) (*WALEntry, error)

GetWAL reads a specific entry from the WAL. If the entry doesn't exist, then nil value is returned.

The kind, value, and error are returned.

type WALRollbackFunc 

type WALRollbackFunc func(context.Context, *logical.Request, string, interface{}) error

WALRollbackFunc is the callback for rollbacks.

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