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Published: Mar 5, 2018 License: Apache-2.0 Imports: 2 Imported by: 0




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func IsValidErrorCode

func IsValidErrorCode(code ErrorCode) bool

IsValidErrorCode returns true if is one of the valid predefined constants.

func ServerHTTPStatusFromErrorCode

func ServerHTTPStatusFromErrorCode(code ErrorCode) int

ServerHTTPStatusFromErrorCode maps a error type into a similar HTTP response status. It is used by the server handler to set the HTTP response status code. Returns 0 if the ErrorCode is invalid.

func WrapErr

func WrapErr(err error, msg string) error


type Error

type Error interface {
	// Code is of the valid error codes.
	Code() ErrorCode

	// Msg returns a human-readable, unstructured messages describing the error.
	Msg() string

	// WithMeta returns a copy of the Error with the given key-value pair attached
	// as metadata. If the key is already set, it is overwritten.
	WithMeta(key string, val string) Error

	// Meta returns the stored value for the given key. If the key has no set
	// value, Meta returns an empty string. There is no way to distinguish between
	// an unset value and an explicit empty string.
	Meta(key string) string

	// MetaMap returns the complete key-value metadata map stored on the error.
	MetaMap() map[string]string

	// Error returns a string of the form "error <Type>: <Msg>"
	Error() string

Error represents an error in a service call.

func BadRouteError

func BadRouteError(msg string, method, url string) Error

badRouteError is used when the twirp server cannot route a request

func ClientError

func ClientError(desc string, err error) Error

ClientError adds consistency to errors generated in the client

func InternalError

func InternalError(msg string) Error

InternalError constructor for the common Internal error. Should be used to specify that something bad or unexpected happened.

func InternalErrorWith

func InternalErrorWith(err error) Error

InternalErrorWith is an easy way to wrap another error. It adds the underlying error's type as metadata with a key of "cause", which can be useful for debugging. Should be used in the common case of an unexpected error returned from another API, but sometimes it is better to build a more specific error (like with NewError(Unknown, err.Error()), for example).

The returned error also has a Cause() method which will return the original error, if it is known. This can be used with the package to extract the root cause of an error. Information about the root cause of an error is lost when it is serialized, so this doesn't let a client know the exact root cause of a server's error.

func InvalidArgumentError

func InvalidArgumentError(argument string, validationMsg string) Error

InvalidArgumentError constructor for the common InvalidArgument error. Can be used when an argument has invalid format, is a number out of range, is a bad option, etc).

func NewError

func NewError(code ErrorCode, msg string) Error

NewError is the generic constructor for a Error. The ErrorCode must be one of the valid predefined constants, otherwise it will be converted to an error {type: Internal, msg: "invalid error type {{code}}"}. If you need to add metadata, use .WithMeta(key, value) method after building the error.

func NotFoundError

func NotFoundError(msg string) Error

NotFoundError constructor for the common NotFound error.

func RequiredArgumentError

func RequiredArgumentError(argument string) Error

RequiredArgumentError is a more specific constructor for InvalidArgument error. Should be used when the argument is required (expected to have a non-zero value).

type ErrorCode

type ErrorCode string

ErrorCode represents a error type.

const (
	// Canceled indicates the operation was cancelled (typically by the caller).
	Canceled ErrorCode = "canceled"

	// Unknown error. For example when handling errors raised by APIs that do not
	// return enough error information.
	Unknown ErrorCode = "unknown"

	// InvalidArgument indicates client specified an invalid argument. It
	// indicates arguments that are problematic regardless of the state of the
	// system (i.e. a malformed file name, required argument, number out of range,
	// etc.).
	InvalidArgument ErrorCode = "invalid_argument"

	// DeadlineExceeded means operation expired before completion. For operations
	// that change the state of the system, this error may be returned even if the
	// operation has completed successfully (timeout).
	DeadlineExceeded ErrorCode = "deadline_exceeded"

	// NotFound means some requested entity was not found.
	NotFound ErrorCode = "not_found"

	// BadRoute means that the requested URL path wasn't routable to a
	// service and method. This is returned by the generated server, and usually
	// shouldn't be returned by applications. Instead, applications should use
	// NotFound or Unimplemented.
	BadRoute ErrorCode = "bad_route"

	// AlreadyExists means an attempt to create an entity failed because one
	// already exists.
	AlreadyExists ErrorCode = "already_exists"

	// PermissionDenied indicates the caller does not have permission to execute
	// the specified operation. It must not be used if the caller cannot be
	// identified (Unauthenticated).
	PermissionDenied ErrorCode = "permission_denied"

	// Unauthenticated indicates the request does not have valid authentication
	// credentials for the operation.
	Unauthenticated ErrorCode = "unauthenticated"

	// ResourceExhausted indicates some resource has been exhausted, perhaps a
	// per-user quota, or perhaps the entire file system is out of space.
	ResourceExhausted ErrorCode = "resource_exhausted"

	// FailedPrecondition indicates operation was rejected because the system is
	// not in a state required for the operation's execution. For example, doing
	// an rmdir operation on a directory that is non-empty, or on a non-directory
	// object, or when having conflicting read-modify-write on the same resource.
	FailedPrecondition ErrorCode = "failed_precondition"

	// Aborted indicates the operation was aborted, typically due to a concurrency
	// issue like sequencer check failures, transaction aborts, etc.
	Aborted ErrorCode = "aborted"

	// OutOfRange means operation was attempted past the valid range. For example,
	// seeking or reading past end of a paginated collection.
	// Unlike InvalidArgument, this error indicates a problem that may be fixed if
	// the system state changes (i.e. adding more items to the collection).
	// There is a fair bit of overlap between FailedPrecondition and OutOfRange.
	// We recommend using OutOfRange (the more specific error) when it applies so
	// that callers who are iterating through a space can easily look for an
	// OutOfRange error to detect when they are done.
	OutOfRange ErrorCode = "out_of_range"

	// Unimplemented indicates operation is not implemented or not
	// supported/enabled in this service.
	Unimplemented ErrorCode = "unimplemented"

	// Internal errors. When some invariants expected by the underlying system
	// have been broken. In other words, something bad happened in the library or
	// backend service. Do not confuse with HTTP Internal Server Error; an
	// Internal error could also happen on the client code, i.e. when parsing a
	// server response.
	Internal ErrorCode = "internal"

	// Unavailable indicates the service is currently unavailable. This is a most
	// likely a transient condition and may be corrected by retrying with a
	// backoff.
	Unavailable ErrorCode = "unavailable"

	// DataLoss indicates unrecoverable data loss or corruption.
	DataLoss ErrorCode = "data_loss"

	// NoError is the zero-value, is considered an empty error and should not be
	// used.
	NoError ErrorCode = ""

Valid error types. Most error types are equivalent to gRPC status codes and follow the same semantics.

type WrappedErr

type WrappedErr struct {
	// contains filtered or unexported fields

wrappedErr fulfills the .Error interface and the interface. It exposes all the error methods, but root cause of an error can be retrieved with (*wrappedErr).Cause. This is expected to be used with the InternalErrorWith function.

func (*WrappedErr) Cause

func (e *WrappedErr) Cause() error

func (*WrappedErr) Code

func (e *WrappedErr) Code() ErrorCode

func (*WrappedErr) Error

func (e *WrappedErr) Error() string

func (*WrappedErr) Meta

func (e *WrappedErr) Meta(key string) string

func (*WrappedErr) MetaMap

func (e *WrappedErr) MetaMap() map[string]string

func (*WrappedErr) Msg

func (e *WrappedErr) Msg() string

func (*WrappedErr) WithMeta

func (e *WrappedErr) WithMeta(key string, val string) Error

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