errors

package
v0.0.0-...-5352646 Latest Latest
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 Go to latest Published: Mar 26, 2020 License: Apache-2.0 Imports: 21 Imported by: 0

Documentation

Overview

Package errors implements rich errors that carry contextual information such as stack traces, causality and attributes.

Example 
package main

import (
	"fmt"

	"go.thethings.network/lorawan-stack/pkg/errors"
	"go.thethings.network/lorawan-stack/pkg/ttnpb"
)

func main() {
	var errApplicationNotFound = errors.DefineNotFound(
		"application_not_found",
		"Application with ID `{id}` not found",
	// Public attribute "id" is parsed from the message format.
	)
	var errCouldNotCreateDevice = errors.Define(
		"could_not_create_device",
		"Could not create Device",
		"right_answer", // right_answer could be some extra attribute (that isn't rendered in the message format)
	)

	findApplication := func(id *ttnpb.ApplicationIdentifiers) (*ttnpb.Application, error) {
		// try really hard, but fail
		return nil, errApplicationNotFound.WithAttributes("id", id.ApplicationID)
	}

	createDevice := func(dev *ttnpb.EndDevice) error {
		app, err := findApplication(&dev.ApplicationIdentifiers)
		if err != nil {
			return err // you can just pass errors up
		}
		// create device
		_ = app
		return nil
	}

	if err := createDevice(&ttnpb.EndDevice{}); err != nil {
		fmt.Println(errCouldNotCreateDevice.WithCause(err).WithAttributes("right_answer", 42))
	}

}

Output:

error:pkg/errors_test:could_not_create_device (Could not create Device)

Index

Examples

Constants

This section is empty.

Variables

View Source 
var Definitions = make(map[string]*Definition)

Definitions of registered errors. Errors that are defined in init() funcs will be collected for translation.

View Source 
var ErrorDetailsFromProto func(msg ...proto.Message) (details ErrorDetails, rest []proto.Message)

ErrorDetailsFromProto ranges over the given protobuf-encoded messages to extract the ErrorDetails. It returns details if present, as well as the rest of the details.

This variable is set by pkg/ttnpb.

View Source 
var ErrorDetailsToProto func(e ErrorDetails) (msg proto.Message)

ErrorDetailsToProto converts the given ErrorDetails into a protobuf-encoded message.

This variable is set by pkg/ttnpb.

View Source 
var JSONCodec interface {
	Marshal(v interface{}) ([]byte, error)
	Unmarshal(data []byte, v interface{}) error
} = jsonpb.TTN()

JSONCodec can be used to override the default gogoproto/jsonpb.

Functions

func Attributes 

func Attributes(err ...error) map[string]interface{}

Attributes returns the attributes of the errors, if they implement Attributes(). If more than one error is passed, subsequent error attributes will be added if not set.

func Cause 

func Cause(err error) error

Cause returns the cause of the given error, if any.

func Code 

func Code(err error) uint32

Code gets the code of an error. If the error doesn't implement codes, Unknown is returned.

func Details 

func Details(err error) []proto.Message

Details gets the details of the error.

func FromHTTP 

func FromHTTP(resp *http.Response) error

FromHTTP reads an error from the HTTP response.

func HasCode 

func HasCode(err error, c uint32) bool

HasCode returns whether the given error has the given error code. If the error doesn't implement codes, it doesn't have any code.

func IsAborted 

func IsAborted(err error) bool

IsAborted returns whether the given error is of type Aborted.

func IsAlreadyExists 

func IsAlreadyExists(err error) bool

IsAlreadyExists returns whether the given error is of type AlreadyExists.

func IsCanceled 

func IsCanceled(err error) bool

IsCanceled returns whether the givenerror is context.Canceled or of type Canceled.

func IsDataLoss 

func IsDataLoss(err error) bool

IsDataLoss returns whether the given error is of type DataLoss.

func IsDeadlineExceeded 

func IsDeadlineExceeded(err error) bool

IsDeadlineExceeded returns whether the givenerror is context.DeadlineExceeded or of type DeadlineExceeded.

func IsFailedPrecondition 

func IsFailedPrecondition(err error) bool

IsFailedPrecondition returns whether the given error is of type FailedPrecondition.

func IsInternal 

func IsInternal(err error) bool

IsInternal returns whether the given error is of type Internal.

func IsInvalidArgument 

func IsInvalidArgument(err error) bool

IsInvalidArgument returns whether the given error is of type InvalidArgument.

func IsNotFound 

func IsNotFound(err error) bool

IsNotFound returns whether the given error is of type NotFound.

func IsPermissionDenied 

func IsPermissionDenied(err error) bool

IsPermissionDenied returns whether the given error is of type PermissionDenied.

func IsResourceExhausted 

func IsResourceExhausted(err error) bool

IsResourceExhausted returns whether the given error is of type ResourceExhausted.

func IsUnauthenticated 

func IsUnauthenticated(err error) bool

IsUnauthenticated returns whether the given error is of type Unauthenticated.

func IsUnavailable 

func IsUnavailable(err error) bool

IsUnavailable returns whether the given error is of type Unavailable.

func IsUnknown 

func IsUnknown(err error) bool

IsUnknown returns whether the given error is of type Unknown.

func PublicAttributes 

func PublicAttributes(err ...error) map[string]interface{}

PublicAttributes returns the public attributes of the errors, if they implement PublicAttributes(). If more than one error is passed, subsequent error attributes will be added if not set.

func Resemble 

func Resemble(a, b error) bool

Resemble returns true iff the given errors resemble, meaning that the Code, Namespace and Name of the errors are equal. A nil error only resembles nil. Invalid errors or definitions (including typed nil) never resemble anything.

func RootCause 

func RootCause(err error) error

RootCause walks up the "error chain" until it finds the root cause of an error.

func Stack 

func Stack(err error) (stack []error)

Stack returns the entire error stack, including the given error.

func StreamClientInterceptor 

func StreamClientInterceptor() grpc.StreamClientInterceptor

StreamClientInterceptor converts gRPC errors to regular errors.

func StreamServerInterceptor 

func StreamServerInterceptor() grpc.StreamServerInterceptor

StreamServerInterceptor makes sure that returned TTN errors contain a CorrelationID.

func ToHTTP 

func ToHTTP(in error, w http.ResponseWriter) error

ToHTTP writes the error to the HTTP response.

func ToHTTPStatusCode 

func ToHTTPStatusCode(err error) int

ToHTTPStatusCode maps an error to HTTP response codes.

func UnaryClientInterceptor 

func UnaryClientInterceptor() grpc.UnaryClientInterceptor

UnaryClientInterceptor converts gRPC errors to regular errors.

func UnaryServerInterceptor 

func UnaryServerInterceptor() grpc.UnaryServerInterceptor

UnaryServerInterceptor makes sure that returned TTN errors contain a CorrelationID.

Types

type Definition 

type Definition struct {
	// contains filtered or unexported fields
}

Definition of a registered error.

func Define 

func Define(name, messageFormat string, publicAttributes ...string) Definition

Define defines a registered error of type Unknown.

func DefineAborted 

func DefineAborted(name, messageFormat string, publicAttributes ...string) Definition

DefineAborted defines a registered error of type Aborted.

func DefineAlreadyExists 

func DefineAlreadyExists(name, messageFormat string, publicAttributes ...string) Definition

DefineAlreadyExists defines a registered error of type AlreadyExists.

func DefineCorruption 

func DefineCorruption(name, messageFormat string, publicAttributes ...string) Definition

DefineCorruption is the same as DefineDataLoss.

func DefineDataLoss 

func DefineDataLoss(name, messageFormat string, publicAttributes ...string) Definition

DefineDataLoss defines a registered error of type DataLoss.

func DefineFailedPrecondition 

func DefineFailedPrecondition(name, messageFormat string, publicAttributes ...string) Definition

DefineFailedPrecondition defines a registered error of type FailedPrecondition. Use Unavailable if the client can retry just the failing call. Use Aborted if the client should retry at a higher-level.

func DefineInternal 

func DefineInternal(name, messageFormat string, publicAttributes ...string) Definition

DefineInternal defines a registered error of type Internal.

func DefineInvalidArgument 

func DefineInvalidArgument(name, messageFormat string, publicAttributes ...string) Definition

DefineInvalidArgument defines a registered error of type InvalidArgument.

func DefineNotFound 

func DefineNotFound(name, messageFormat string, publicAttributes ...string) Definition

DefineNotFound defines a registered error of type NotFound.

func DefinePermissionDenied 

func DefinePermissionDenied(name, messageFormat string, publicAttributes ...string) Definition

DefinePermissionDenied defines a registered error of type PermissionDenied.

It should be used when a client attempts to perform an authorized action using incorrect credentials or credentials with insufficient rights. If the client attempts to perform the action without providing any form of authentication, Unauthenticated should be used instead.

func DefineResourceExhausted 

func DefineResourceExhausted(name, messageFormat string, publicAttributes ...string) Definition

DefineResourceExhausted defines a registered error of type ResourceExhausted.

func DefineUnauthenticated 

func DefineUnauthenticated(name, messageFormat string, publicAttributes ...string) Definition

DefineUnauthenticated defines a registered error of type Unauthenticated. It should be used when a client attempts to perform an authenticated action without providing any form of authentication. If the client attempts to perform the action using incorrect credentials or credentials with insufficient rights, PermissionDenied should be used instead.

func DefineUnavailable 

func DefineUnavailable(name, messageFormat string, publicAttributes ...string) Definition

DefineUnavailable defines a registered error of type Unavailable.

func DefineUnimplemented 

func DefineUnimplemented(name, messageFormat string, publicAttributes ...string) Definition

Unimplemented defines a registered error of type Unimplemented.

func (Definition) Attributes 

func (d Definition) Attributes() map[string]interface{}

Attributes are not present in the error definition, so this just returns nil.

func (Definition) Cause 

func (d Definition) Cause() error

Cause returns ret root cause of the error, in this case the descriptor itself.

func (Definition) Code 

func (d Definition) Code() uint32

Code of the error. This code is consistent with google.golang.org/genproto/googleapis/rpc/code and google.golang.org/grpc/codes.

func (Definition) CorrelationID 

func (d Definition) CorrelationID() string

CorrelationID is not present in the error definition, so this just returns an empty string.

func (Definition) Details 

func (d Definition) Details() []proto.Message

Details are not present in the error definition, so this just returns nil.

func (Definition) Error 

func (d Definition) Error() string

Error implements the error interface.

func (Definition) FormatMessage 

func (d Definition) FormatMessage(attributes map[string]interface{}) string

FormatMessage formats the message using the given attributes.

func (Definition) FullName 

func (d Definition) FullName() string

FullName returns the full name (namespace:name) of the error.

func (Definition) GRPCStatus 

func (d Definition) GRPCStatus() *status.Status

GRPCStatus returns the Definition as a gRPC status message.

func (Definition) MarshalJSON 

func (d Definition) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler.

func (Definition) MessageFormat 

func (d Definition) MessageFormat() string

MessageFormat of the error.

func (Definition) Name 

func (d Definition) Name() string

Name of the error.

func (Definition) Namespace 

func (d Definition) Namespace() string

Namespace of the error.

func (Definition) New 

func (d Definition) New() Error

New returns a new error from the definition. This is not required, but will add a stack trace for improved debugging.

func (Definition) PublicAttributes 

func (d Definition) PublicAttributes() map[string]interface{}

PublicAttributes are not present in the error definition, so this just returns nil.

func (Definition) String 

func (d Definition) String() string

func (*Definition) UnmarshalJSON 

func (d *Definition) UnmarshalJSON(data []byte) error

UnmarshalJSON implements json.Unmarshaler.

This func is purely implemented for consistency. In practice, you probably want to unmarshal into an *Error instead of a *Definition.

func (Definition) WithAttributes 

func (d Definition) WithAttributes(kv ...interface{}) Error

WithAttributes returns a new error from the definition, and sets the given attributes.

func (Definition) WithCause 

func (d Definition) WithCause(cause error) Error

WithCause returns a new error from the definition, and sets the cause of the error.

func (Definition) WithDetails 

func (d Definition) WithDetails(details ...proto.Message) Error

WithDetails returns a new error from the definition, and sets the given details.

type DefinitionInterface 

type DefinitionInterface interface {
	error
	fmt.Stringer
	Namespace() string
	Name() string
	FullName() string
	MessageFormat() string
	Code() uint32
}

DefinitionInterface is the interface of an error definition.

type Error 

type Error struct {
	Definition
	// contains filtered or unexported fields
}

Error is a rich error implementation.

func From 

func From(err error) (out *Error, ok bool)

From returns an *Error if it can be derived from the given input. For a nil error, false will be returned.

func FromGRPCStatus 

func FromGRPCStatus(status *status.Status) Error

FromGRPCStatus converts the gRPC status message into an Error.

func FromHTTPStatusCode 

func FromHTTPStatusCode(status int, publicAttributes ...string) Error

FromHTTPStatusCode maps an HTTP response code to an error.

func New 

func New(text string) Error

New returns an error that formats as the given text. This way of creating errors should be avoided if possible.

func (Error) Attributes 

func (e Error) Attributes() map[string]interface{}

Attributes of the error.

func (Error) Cause 

func (e Error) Cause() error

Cause returns the cause of the error.

func (Error) Code 

func (e Error) Code() uint32

Code of the error. If the code is invalid or unknown, this tries to get the code from the cause of this error. This code is consistent with google.golang.org/genproto/googleapis/rpc/code and google.golang.org/grpc/codes.

func (Error) CorrelationID 

func (e Error) CorrelationID() string

CorrelationID of the error.

func (Error) Details 

func (e Error) Details() (details []proto.Message)

Details of the error. Usually structs from ttnpb or google.golang.org/genproto/googleapis/rpc/errdetails.

func (Error) Error 

func (e Error) Error() string

Error implements the error interface.

func (Error) Fields 

func (e Error) Fields() map[string]interface{}

Fields implements the log.Fielder interface.

func (*Error) GRPCStatus 

func (e *Error) GRPCStatus() *status.Status

GRPCStatus converts the Error into a gRPC status message.

func (Error) MarshalJSON 

func (e Error) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler.

func (Error) PublicAttributes 

func (e Error) PublicAttributes() map[string]interface{}

PublicAttributes of the error.

func (Error) StackTrace 

func (s Error) StackTrace() errors.StackTrace

StackTrace implements the errors.stackTracer interface.

func (Error) String 

func (e Error) String() string

func (*Error) UnmarshalJSON 

func (e *Error) UnmarshalJSON(data []byte) error

UnmarshalJSON implements json.Unmarshaler.

func (Error) WithAttributes 

func (e Error) WithAttributes(kv ...interface{}) Error

WithAttributes returns the error with the given attributes set. Any conflicting attributes in the Error will be overwritten.

func (Error) WithCause 

func (e Error) WithCause(cause error) Error

WithCause returns the error with the given cause set. Overwriting an existing cause in the Error will cause a panic.

func (Error) WithDetails 

func (e Error) WithDetails(details ...proto.Message) Error

WithDetails returns the error with the given details set. This appends to any existing details in the Error.

type ErrorDetails 

type ErrorDetails interface {
	Error() string
	Namespace() string
	Name() string
	MessageFormat() string
	PublicAttributes() map[string]interface{}
	CorrelationID() string
	Cause() error
	Code() uint32
	Details() []proto.Message
}

ErrorDetails that can be carried over API.

type Interface 

type Interface interface {
	DefinitionInterface
	Attributes() map[string]interface{}
	Cause() error
	Details() (details []proto.Message)
}

Interface is the interface of an error.

Source Files

View all Source files

Directories

Path Synopsis
Package web implements a middleware to handle HTTP errors.
 Package web implements a middleware to handle HTTP errors.

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