verror

package
v0.2.0 Latest Latest
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 Go to latest Published: Apr 17, 2023 License: BSD-3-Clause Imports: 13 Imported by: 344

Documentation

Overview

Package verror implements an error reporting mechanism that works across programming environments, and a set of common errors. It captures the location and parameters of the error call site to aid debugging. Errorf is not intended for localization, whereas Message accepts a preformatted message to allow for localization via an alternative package/framework.

Each error has an identifier string, which is used for equality checks. E.g. a Javascript client can check if a Go server returned a NoExist error by checking the string identifier. Error identifier strings start with the VDL package path to ensure uniqueness, e.g. "v.io/v23/verror.NoExist". The NewID and NewIDAction functions automatically prepend the package path of the caller to the specified ID if it is not already included.

Each error contains an action, which is the suggested action for a typical client to perform upon receiving the error. E.g. some action codes represent whether to retry the operation after receiving the error.

Each error also contains a list of typed parameters, and an error message. The error message may be created in two ways:

  1. Via the Errorf method using fmt.Sprintf formatting.
  2. Via the Message method where the error message is preformatted and the parameter list is recorded.

Example:

To define a new error identifier, for example "someNewError", the code that originates the error is expected to declare a variable like this: 

var someNewError = verror.Register("someNewError", NoRetry)
...
return someNewError.Errorf(ctx, "my error message: %v", err)

Alternatively, to use golang.org/x/text/messsage for localization: 

p := message.NewPrinter(language.BritishEnglish)
msg := p.Sprintf("invalid name: %v: %v", name, err)
return someNewError.Message(ctx, msg, name, err)

The verror implementation supports errors.Is and errors.Unwrap. Note that errors.Unwrap provides access to 'sub-errors' as well as to chained instances of error. verror.WithSubErrors can be used to add additional 'sub-errors' to an existing error and these may be of type SubErr or any other error.

If the context.T specified with Errorf() or Message() is nil, a default context is used, set by SetDefaultContext(). This can be used in standalone programmes, or in anciliary threads not associated with an RPC. The user might do the following to get the language from the environment, and the programme name from Args[0]: 

ctx := runtime.NewContext()
ctx = verror.WithComponentName(ctx, os.Args[0])
verror.SetDefaultContext(ctx)

A standalone tool might set the operation name to be a subcommand name, if any. If the default context has not been set, the error generated has no component and operation values.

This file was auto-generated by the vanadium vdl tool. Package: verror

Index

Constants

This section is empty.

Variables

View Source 
var (

	// ErrUnknown means the error has no known Id.  A more specific error should
	// always be used, if possible.  Unknown is typically only used when
	// automatically converting errors that do not contain an Id.
	ErrUnknown = NewIDAction("v.io/v23/verror.Unknown", NoRetry)
	// ErrInternal means an internal error has occurred.  A more specific error
	// should always be used, if possible.
	ErrInternal = NewIDAction("v.io/v23/verror.Internal", NoRetry)
	// ErrNotImplemented means that the request type is valid but that the method to
	// handle the request has not been implemented.
	ErrNotImplemented = NewIDAction("v.io/v23/verror.NotImplemented", NoRetry)
	// ErrEndOfFile means the end-of-file has been reached; more generally, no more
	// input data is available.
	ErrEndOfFile = NewIDAction("v.io/v23/verror.EndOfFile", NoRetry)
	// ErrBadArg means the arguments to an operation are invalid or incorrectly
	// formatted.
	ErrBadArg = NewIDAction("v.io/v23/verror.BadArg", NoRetry)
	// ErrBadState means an operation was attempted on an object while the object was
	// in an incompatible state.
	ErrBadState = NewIDAction("v.io/v23/verror.BadState", NoRetry)
	// ErrBadVersion means the version presented by the client (e.g. to a service
	// that supports content-hash-based caching or atomic read-modify-write) was
	// out of date or otherwise invalid, likely because some other request caused
	// the version at the server to change. The client should get a fresh version
	// and try again.
	ErrBadVersion = NewIDAction("v.io/v23/verror.BadVersion", NoRetry)
	// ErrExist means that the requested item already exists; typically returned when
	// an attempt to create an item fails because it already exists.
	ErrExist = NewIDAction("v.io/v23/verror.Exist", NoRetry)
	// ErrNoExist means that the requested item does not exist; typically returned
	// when an attempt to lookup an item fails because it does not exist.
	ErrNoExist       = NewIDAction("v.io/v23/verror.NoExist", NoRetry)
	ErrUnknownMethod = NewIDAction("v.io/v23/verror.UnknownMethod", NoRetry)
	ErrUnknownSuffix = NewIDAction("v.io/v23/verror.UnknownSuffix", NoRetry)
	// ErrNoExistOrNoAccess means that either the requested item does not exist, or
	// is inaccessible.  Typically returned when the distinction between existence
	// and inaccessiblity should be hidden to preserve privacy.
	ErrNoExistOrNoAccess = NewIDAction("v.io/v23/verror.NoExistOrNoAccess", NoRetry)
	// ErrNoServers means a name was resolved to unusable or inaccessible servers.
	ErrNoServers = NewIDAction("v.io/v23/verror.NoServers", RetryRefetch)
	// ErrNoAccess means the server does not authorize the client for access.
	ErrNoAccess = NewIDAction("v.io/v23/verror.NoAccess", RetryRefetch)
	// ErrNotTrusted means the client does not trust the server.
	ErrNotTrusted = NewIDAction("v.io/v23/verror.NotTrusted", RetryRefetch)
	// ErrAborted means that an operation was not completed because it was aborted by
	// the receiver.  A more specific error should be used if it would help the
	// caller decide how to proceed.
	ErrAborted = NewIDAction("v.io/v23/verror.Aborted", NoRetry)
	// ErrBadProtocol means that an operation was not completed because of a protocol
	// or codec error.
	ErrBadProtocol = NewIDAction("v.io/v23/verror.BadProtocol", NoRetry)
	// ErrCanceled means that an operation was not completed because it was
	// explicitly cancelled by the caller.
	ErrCanceled = NewIDAction("v.io/v23/verror.Canceled", NoRetry)
	// ErrTimeout means that an operation was not completed before the time deadline
	// for the operation.
	ErrTimeout = NewIDAction("v.io/v23/verror.Timeout", NoRetry)
)

Functions

func DebugString 

func DebugString(err error) string

DebugString returns a more verbose string representation of an error, perhaps more thorough than one might present to an end user, but useful for debugging by a developer.

func Errorf added in v0.1.10 

func Errorf(ctx *context.T, format string, params ...interface{}) error

Errorf is like ErrUnknown.Errorf.

func ErrorfAborted added in v0.1.10 

func ErrorfAborted(ctx *context.T, format string) error

ErrorfAborted calls ErrAborted.Errorf with the supplied arguments.

func ErrorfBadArg added in v0.1.10 

func ErrorfBadArg(ctx *context.T, format string) error

ErrorfBadArg calls ErrBadArg.Errorf with the supplied arguments.

func ErrorfBadProtocol added in v0.1.10 

func ErrorfBadProtocol(ctx *context.T, format string) error

ErrorfBadProtocol calls ErrBadProtocol.Errorf with the supplied arguments.

func ErrorfBadState added in v0.1.10 

func ErrorfBadState(ctx *context.T, format string) error

ErrorfBadState calls ErrBadState.Errorf with the supplied arguments.

func ErrorfBadVersion added in v0.1.10 

func ErrorfBadVersion(ctx *context.T, format string) error

ErrorfBadVersion calls ErrBadVersion.Errorf with the supplied arguments.

func ErrorfCanceled added in v0.1.10 

func ErrorfCanceled(ctx *context.T, format string) error

ErrorfCanceled calls ErrCanceled.Errorf with the supplied arguments.

func ErrorfEndOfFile added in v0.1.10 

func ErrorfEndOfFile(ctx *context.T, format string) error

ErrorfEndOfFile calls ErrEndOfFile.Errorf with the supplied arguments.

func ErrorfExist added in v0.1.10 

func ErrorfExist(ctx *context.T, format string) error

ErrorfExist calls ErrExist.Errorf with the supplied arguments.

func ErrorfInternal added in v0.1.10 

func ErrorfInternal(ctx *context.T, format string) error

ErrorfInternal calls ErrInternal.Errorf with the supplied arguments.

func ErrorfNoAccess added in v0.1.10 

func ErrorfNoAccess(ctx *context.T, format string) error

ErrorfNoAccess calls ErrNoAccess.Errorf with the supplied arguments.

func ErrorfNoExist added in v0.1.10 

func ErrorfNoExist(ctx *context.T, format string) error

ErrorfNoExist calls ErrNoExist.Errorf with the supplied arguments.

func ErrorfNoExistOrNoAccess added in v0.1.10 

func ErrorfNoExistOrNoAccess(ctx *context.T, format string) error

ErrorfNoExistOrNoAccess calls ErrNoExistOrNoAccess.Errorf with the supplied arguments.

func ErrorfNoServers added in v0.1.10 

func ErrorfNoServers(ctx *context.T, format string) error

ErrorfNoServers calls ErrNoServers.Errorf with the supplied arguments.

func ErrorfNotImplemented added in v0.1.10 

func ErrorfNotImplemented(ctx *context.T, format string) error

ErrorfNotImplemented calls ErrNotImplemented.Errorf with the supplied arguments.

func ErrorfNotTrusted added in v0.1.10 

func ErrorfNotTrusted(ctx *context.T, format string) error

ErrorfNotTrusted calls ErrNotTrusted.Errorf with the supplied arguments.

func ErrorfTimeout added in v0.1.10 

func ErrorfTimeout(ctx *context.T, format string) error

ErrorfTimeout calls ErrTimeout.Errorf with the supplied arguments.

func ErrorfUnknown added in v0.1.10 

func ErrorfUnknown(ctx *context.T, format string) error

ErrorfUnknown calls ErrUnknown.Errorf with the supplied arguments.

func ErrorfUnknownMethod added in v0.1.10 

func ErrorfUnknownMethod(ctx *context.T, format string) error

ErrorfUnknownMethod calls ErrUnknownMethod.Errorf with the supplied arguments.

func ErrorfUnknownSuffix added in v0.1.10 

func ErrorfUnknownSuffix(ctx *context.T, format string) error

ErrorfUnknownSuffix calls ErrUnknownSuffix.Errorf with the supplied arguments.

func FromWire 

func FromWire(wire *vdl.WireError) error

FromWire is a convenience for generated code to convert wire errors into native errors.

func IsAny added in v0.1.10 

func IsAny(err error) bool

IsAny returns true if err is any instance of a verror.E regardless of its ID.

func Message added in v0.1.10 

func Message(ctx *context.T, msg string, params ...interface{}) error

Message is like ErrUnknown.Message.

func MessageAborted added in v0.1.10 

func MessageAborted(ctx *context.T, message string) error

MessageAborted calls ErrAborted.Message with the supplied arguments.

func MessageBadArg added in v0.1.10 

func MessageBadArg(ctx *context.T, message string) error

MessageBadArg calls ErrBadArg.Message with the supplied arguments.

func MessageBadProtocol added in v0.1.10 

func MessageBadProtocol(ctx *context.T, message string) error

MessageBadProtocol calls ErrBadProtocol.Message with the supplied arguments.

func MessageBadState added in v0.1.10 

func MessageBadState(ctx *context.T, message string) error

MessageBadState calls ErrBadState.Message with the supplied arguments.

func MessageBadVersion added in v0.1.10 

func MessageBadVersion(ctx *context.T, message string) error

MessageBadVersion calls ErrBadVersion.Message with the supplied arguments.

func MessageCanceled added in v0.1.10 

func MessageCanceled(ctx *context.T, message string) error

MessageCanceled calls ErrCanceled.Message with the supplied arguments.

func MessageEndOfFile added in v0.1.10 

func MessageEndOfFile(ctx *context.T, message string) error

MessageEndOfFile calls ErrEndOfFile.Message with the supplied arguments.

func MessageExist added in v0.1.10 

func MessageExist(ctx *context.T, message string) error

MessageExist calls ErrExist.Message with the supplied arguments.

func MessageInternal added in v0.1.10 

func MessageInternal(ctx *context.T, message string) error

MessageInternal calls ErrInternal.Message with the supplied arguments.

func MessageNoAccess added in v0.1.10 

func MessageNoAccess(ctx *context.T, message string) error

MessageNoAccess calls ErrNoAccess.Message with the supplied arguments.

func MessageNoExist added in v0.1.10 

func MessageNoExist(ctx *context.T, message string) error

MessageNoExist calls ErrNoExist.Message with the supplied arguments.

func MessageNoExistOrNoAccess added in v0.1.10 

func MessageNoExistOrNoAccess(ctx *context.T, message string) error

MessageNoExistOrNoAccess calls ErrNoExistOrNoAccess.Message with the supplied arguments.

func MessageNoServers added in v0.1.10 

func MessageNoServers(ctx *context.T, message string) error

MessageNoServers calls ErrNoServers.Message with the supplied arguments.

func MessageNotImplemented added in v0.1.10 

func MessageNotImplemented(ctx *context.T, message string) error

MessageNotImplemented calls ErrNotImplemented.Message with the supplied arguments.

func MessageNotTrusted added in v0.1.10 

func MessageNotTrusted(ctx *context.T, message string) error

MessageNotTrusted calls ErrNotTrusted.Message with the supplied arguments.

func MessageTimeout added in v0.1.10 

func MessageTimeout(ctx *context.T, message string) error

MessageTimeout calls ErrTimeout.Message with the supplied arguments.

func MessageUnknown added in v0.1.10 

func MessageUnknown(ctx *context.T, message string) error

MessageUnknown calls ErrUnknown.Message with the supplied arguments.

func MessageUnknownMethod added in v0.1.10 

func MessageUnknownMethod(ctx *context.T, message string) error

MessageUnknownMethod calls ErrUnknownMethod.Message with the supplied arguments.

func MessageUnknownSuffix added in v0.1.10 

func MessageUnknownSuffix(ctx *context.T, message string) error

MessageUnknownSuffix calls ErrUnknownSuffix.Message with the supplied arguments.

func Params added in v0.1.10 

func Params(err error) []interface{}

Params returns the ParameterList stored in err if it's an instance of verror.E, nil otherwise.

func ParamsErrAborted added in v0.1.10 

func ParamsErrAborted(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrAborted extracts the expected parameters from the error's ParameterList.

func ParamsErrBadArg added in v0.1.10 

func ParamsErrBadArg(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrBadArg extracts the expected parameters from the error's ParameterList.

func ParamsErrBadProtocol added in v0.1.10 

func ParamsErrBadProtocol(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrBadProtocol extracts the expected parameters from the error's ParameterList.

func ParamsErrBadState added in v0.1.10 

func ParamsErrBadState(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrBadState extracts the expected parameters from the error's ParameterList.

func ParamsErrBadVersion added in v0.1.10 

func ParamsErrBadVersion(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrBadVersion extracts the expected parameters from the error's ParameterList.

func ParamsErrCanceled added in v0.1.10 

func ParamsErrCanceled(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrCanceled extracts the expected parameters from the error's ParameterList.

func ParamsErrEndOfFile added in v0.1.10 

func ParamsErrEndOfFile(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrEndOfFile extracts the expected parameters from the error's ParameterList.

func ParamsErrExist added in v0.1.10 

func ParamsErrExist(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrExist extracts the expected parameters from the error's ParameterList.

func ParamsErrInternal added in v0.1.10 

func ParamsErrInternal(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrInternal extracts the expected parameters from the error's ParameterList.

func ParamsErrNoAccess added in v0.1.10 

func ParamsErrNoAccess(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrNoAccess extracts the expected parameters from the error's ParameterList.

func ParamsErrNoExist added in v0.1.10 

func ParamsErrNoExist(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrNoExist extracts the expected parameters from the error's ParameterList.

func ParamsErrNoExistOrNoAccess added in v0.1.10 

func ParamsErrNoExistOrNoAccess(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrNoExistOrNoAccess extracts the expected parameters from the error's ParameterList.

func ParamsErrNoServers added in v0.1.10 

func ParamsErrNoServers(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrNoServers extracts the expected parameters from the error's ParameterList.

func ParamsErrNotImplemented added in v0.1.10 

func ParamsErrNotImplemented(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrNotImplemented extracts the expected parameters from the error's ParameterList.

func ParamsErrNotTrusted added in v0.1.10 

func ParamsErrNotTrusted(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrNotTrusted extracts the expected parameters from the error's ParameterList.

func ParamsErrTimeout added in v0.1.10 

func ParamsErrTimeout(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrTimeout extracts the expected parameters from the error's ParameterList.

func ParamsErrUnknown added in v0.1.10 

func ParamsErrUnknown(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrUnknown extracts the expected parameters from the error's ParameterList.

func ParamsErrUnknownMethod added in v0.1.10 

func ParamsErrUnknownMethod(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrUnknownMethod extracts the expected parameters from the error's ParameterList.

func ParamsErrUnknownSuffix added in v0.1.10 

func ParamsErrUnknownSuffix(argumentError error) (verrorComponent string, verrorOperation string, returnErr error)

ParamsErrUnknownSuffix extracts the expected parameters from the error's ParameterList.

func SetDefaultContext 

func SetDefaultContext(ctx *context.T)

SetDefaultContext sets the default context used when a nil context.T is passed to New() or Convert(). It is typically used in standalone programmes that have no RPC context, or in servers for the context of ancillary threads not associated with any particular RPC.

func StackToText 

func StackToText(w io.Writer, stack []uintptr)

StackToText emits on w a text representation of stack, which is typically obtained from Stack() and represents the source location(s) where an error was generated or passed through in the local address space.

func VDLRead 

func VDLRead(dec vdl.Decoder, x *error) error

VDLRead implements the logic to read x from dec.

Unlike regular VDLRead implementations, this handles the case where the decoder contains a nil value, to make code generation simpler.

func VDLWrite 

func VDLWrite(enc vdl.Encoder, x error) error

VDLWrite implements the logic to write x to enc.

Unlike regular VDLWrite implementations, this handles the case where x contains a nil value, to make code generation simpler.

func WireFromNative 

func WireFromNative(wire **vdl.WireError, native error) error

WireFromNative converts from the native to wire representation of errors.

func WireToNative 

func WireToNative(wire *vdl.WireError, native *error) error

WireToNative converts from the wire to native representation of errors.

func WithComponentName 

func WithComponentName(ctx *context.T, componentName string) *context.T

WithComponentName returns a context based on ctx that has the componentName that New() and Convert() can use.

func WithSubErrors added in v0.1.10 

func WithSubErrors(err error, errors ...error) error

WithSubErrors returns a new E with the supplied suberrors appended to its parameter list. The results of their Error method are appended to that of err.Error().

Types

type ActionCode 

type ActionCode uint32

An ActionCode represents the action expected to be performed by a typical client receiving an error that perhaps it does not understand. 

const (
	// Retry actions are encoded in the bottom few bits.
	RetryActionMask ActionCode = 3

	NoRetry         ActionCode = 0 // Do not retry.
	RetryConnection ActionCode = 1 // Renew high-level connection/context.
	RetryRefetch    ActionCode = 2 // Refetch and retry (e.g., out of date HTTP ETag)
	RetryBackoff    ActionCode = 3 // Backoff and retry a finite number of times.
)

Codes for ActionCode.

func Action 

func Action(err error) ActionCode

Action returns the action of the given err, or NoRetry if the err has no Action.

func (ActionCode) RetryAction 

func (ac ActionCode) RetryAction() ActionCode

RetryAction returns the part of the ActionCode that indicates retry behaviour.

type E 

type E struct {
	ID        ID            // The identity of the error.
	Action    ActionCode    // Default action to take on error.
	Msg       string        // Error message; empty if no language known.
	ParamList []interface{} // The variadic parameters given to ExplicitNew().
	// contains filtered or unexported fields
}

E is the in-memory representation of a verror error.

The wire representation is defined as vdl.WireError; values of E type are automatically converted to/from vdl.WireError by VDL and VOM.

func (E) Error 

func (e E) Error() string

Error returns the error message; if it has not been formatted for a specific language, a default message containing the error ID and parameters is generated. This method is required to fulfil the error interface.

func (E) Is added in v0.1.10 

func (e E) Is(err error) bool

Is implements the Is method as expected by errors.Is.

func (E) Unwrap added in v0.1.10 

func (e E) Unwrap() error

Unwrap implements the Unwrap method as expected by errors.Unwrap. It returns verror.SubErrors followed by any error recorded with %w for Errorf or the last argument to Message, New or ExplicitNew.

func (E) VDLEqual 

func (e E) VDLEqual(yiface interface{}) bool

func (*E) VDLRead 

func (e *E) VDLRead(dec vdl.Decoder) error

func (E) VDLReflect 

func (E) VDLReflect(struct {
	Name string `vdl:"v.io/v23/vdl.WireError"`
})

TypeOf(verror.E{}) should give vdl.WireError.

func (E) VDLWrite 

func (e E) VDLWrite(enc vdl.Encoder) error

type ID 

type ID string

ID is a unique identifier for errors.

func ErrorID 

func ErrorID(err error) ID

ErrorID returns the ID of the given err, or Unknown if the err has no ID. If err is nil then ErrorID returns "".

func IDPath added in v0.1.13 

func IDPath(val interface{}, id string) ID

IDPath returns a string of the form <package-path>.<name> where <package-path> is derived from the type of the supplied value. Typical usage would be except that dummy can be replaced by an existing type defined in the package. 

type dummy int
verror.ID(verror.IDPath(dummy(0), "MyError"))

type IDAction 

type IDAction struct {
	ID     ID
	Action ActionCode
}

An IDAction combines a unique identifier ID for errors with an ActionCode. The ID allows stable error checking across different error messages and different address spaces. By convention the format for the identifier is "PKGPATH.NAME" - e.g. ErrIDFoo defined in the "v23/verror" package has id "v23/verror.ErrIDFoo". It is unwise ever to create two IDActions that associate different ActionCodes with the same ID. IDAction implements error so that it may be used with errors.Is.

func NewID added in v0.1.10 

func NewID(id ID) IDAction

NewID creates a new instance of IDAction with the given ID and a NoRetry Action.

func NewIDAction added in v0.1.10 

func NewIDAction(id ID, action ActionCode) IDAction

NewIDAction creates a new instance of IDAction with the given ID and Action field. It should be used when localization support is not required instead of Register. IDPath can be used to

func (IDAction) Error added in v0.1.10 

func (id IDAction) Error() string

Error implements error.

func (IDAction) Errorf added in v0.1.10 

func (id IDAction) Errorf(ctx *context.T, format string, params ...interface{}) error

Errorf creates a new verror.E that uses fmt.Errorf style formatting and is not intended for localization. Errorf prepends the component and operation name if they can be extracted from the context. It supports %w for errors.Unwrap which takes precedence over using the last parameter if it's an error as the error to be returned by Unwrap.

func (IDAction) Is added in v0.1.10 

func (id IDAction) Is(err error) bool

Is implements the Is method as expected by errors.Is.

func (IDAction) Message added in v0.1.10 

func (id IDAction) Message(ctx *context.T, msg string, params ...interface{}) error

Message is intended for pre-internationalizated messages. The msg is assumed to be have been preformated and the params are recorded in E.ParamList. If the last parameter is an error it will returned by Unwrap.

type PCs 

type PCs []uintptr

PCs represents a list of PC locations

func Stack 

func Stack(err error) PCs

Stack returns the list of PC locations on the stack when this error was first generated within this address space, or an empty list if err is not an E.

func (PCs) String 

func (st PCs) String() string

type SubErr 

type SubErr struct {
	Name    string
	Err     error
	Options SubErrOpts
}

A SubErr represents a (string, error, int32) triple that allows clients to include subordinate errors to an error's parameter list. Clients can add a SubErr to the parameter list directly, via WithSubErrors. By convention, clients are expected to use name of the form "X=Y" to distinguish their subordinate errors from those of other abstraction layers. For example, a layer reporting on errors in individual blessings in an RPC might use strings like "blessing=<blessing_name>".

func (SubErr) Error added in v0.1.10 

func (subErr SubErr) Error() string

Error implements error.

func (SubErr) String added in v0.1.10 

func (subErr SubErr) String() string

type SubErrOpts 

type SubErrOpts uint32
const (
	// Print, when set in SubErr.Options, tells Error() to print this SubErr.
	Print SubErrOpts = 0x1
)

type VDLNativeConverter added in v0.1.17 

type VDLNativeConverter struct{}

func (VDLNativeConverter) FromNative added in v0.1.17 

func (VDLNativeConverter) FromNative(wire, native interface{}) error

FromNative implements vdl.NativeConverter.

func (VDLNativeConverter) ToNative added in v0.1.17 

func (VDLNativeConverter) ToNative(wire, native interface{}) error

ToNative implements vdl.NativeConverter.

Source Files

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