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errors.go
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errors.go
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package errors
import (
"fmt"
"reflect"
"strings"
"github.com/pkg/errors"
)
// RootCodespace is the codespace for all errors defined in this package
const RootCodespace = "sdk"
// UndefinedCodespace when we explicitly declare no codespace
const UndefinedCodespace = "undefined"
var (
// ErrInternal should never be exposed, but we reserve this code for non-specified errors
//nolint
ErrInternal = Register(UndefinedCodespace, 1, "internal")
// ErrTxDecode is returned if we cannot parse a transaction
ErrTxDecode = Register(RootCodespace, 2, "tx parse error")
// ErrInvalidSequence is used the sequence number (nonce) is incorrect
// for the signature
ErrInvalidSequence = Register(RootCodespace, 3, "invalid sequence")
// ErrUnauthorized is used whenever a request without sufficient
// authorization is handled.
ErrUnauthorized = Register(RootCodespace, 4, "unauthorized")
// ErrInsufficientFunds is used when the account cannot pay requested amount.
ErrInsufficientFunds = Register(RootCodespace, 5, "insufficient funds")
// ErrUnknownRequest to doc
ErrUnknownRequest = Register(RootCodespace, 6, "unknown request")
// ErrInvalidAddress to doc
ErrInvalidAddress = Register(RootCodespace, 7, "invalid address")
// ErrInvalidPubKey to doc
ErrInvalidPubKey = Register(RootCodespace, 8, "invalid pubkey")
// ErrUnknownAddress to doc
ErrUnknownAddress = Register(RootCodespace, 9, "unknown address")
// ErrInvalidCoins to doc
ErrInvalidCoins = Register(RootCodespace, 10, "invalid coins")
// ErrOutOfGas to doc
ErrOutOfGas = Register(RootCodespace, 11, "out of gas")
// ErrMemoTooLarge to doc
ErrMemoTooLarge = Register(RootCodespace, 12, "memo too large")
// ErrInsufficientFee to doc
ErrInsufficientFee = Register(RootCodespace, 13, "insufficient fee")
// ErrTooManySignatures to doc
ErrTooManySignatures = Register(RootCodespace, 14, "maximum number of signatures exceeded")
// ErrNoSignatures to doc
ErrNoSignatures = Register(RootCodespace, 15, "no signatures supplied")
// ErrJSONMarshal defines an ABCI typed JSON marshalling error
ErrJSONMarshal = Register(RootCodespace, 16, "failed to marshal JSON bytes")
// ErrJSONUnmarshal defines an ABCI typed JSON unmarshalling error
ErrJSONUnmarshal = Register(RootCodespace, 17, "failed to unmarshal JSON bytes")
// ErrInvalidRequest defines an ABCI typed error where the request contains
// invalid data.
ErrInvalidRequest = Register(RootCodespace, 18, "invalid request")
// ErrTxInMempoolCache defines an ABCI typed error where a tx already exists
// in the mempool.
ErrTxInMempoolCache = Register(RootCodespace, 19, "tx already in mempool")
// ErrMempoolIsFull defines an ABCI typed error where the mempool is full.
ErrMempoolIsFull = Register(RootCodespace, 20, "mempool is full")
// ErrTxTooLarge defines an ABCI typed error where tx is too large.
ErrTxTooLarge = Register(RootCodespace, 21, "tx too large")
// ErrPanic is only set when we recover from a panic, so we know to
// redact potentially sensitive system info
ErrPanic = Register(UndefinedCodespace, 111222, "panic")
ErrKeyNotFound = Register(RootCodespace, 3000, "key not found")
ErrLogic = Register(RootCodespace, 35, "internal logic error")
// ErrInvalidHeight defines an error for an invalid height
ErrInvalidHeight = Register(RootCodespace, 26, "invalid height")
ErrPackAny = Register(RootCodespace, 33, "failed packing protobuf message to Any")
ErrUnpackAny = Register(RootCodespace, 34, "failed unpacking protobuf message from Any")
ErrInvalidType = Register(RootCodespace, 29, "invalid type")
// ErrInvalidVersion defines a general error for an invalid version
ErrInvalidVersion = Register(RootCodespace, 27, "invalid version")
// ErrInvalidChainID defines an error when the chain-id is invalid.
ErrInvalidChainID = Register(RootCodespace, 28, "invalid chain-id")
ErrNotFound = Register(RootCodespace, 38, "not found")
)
// Register returns an error instance that should be used as the base for
// creating error instances during runtime.
//
// Popular root errors are declared in this package, but extensions may want to
// declare custom codes. This function ensures that no error code is used
// twice. Attempt to reuse an error code results in panic.
//
// Use this function only during a program startup phase.
func Register(codespace string, code uint32, description string) *Error {
// TODO - uniqueness is (codespace, code) combo
if e := getUsed(codespace, code); e != nil {
panic(fmt.Sprintf("error with code %d is already registered: %q", code, e.desc))
}
err := New(codespace, code, description)
setUsed(err)
return err
}
// usedCodes is keeping track of used codes to ensure their uniqueness. No two
// error instances should share the same (codespace, code) tuple.
var usedCodes = map[string]*Error{}
func errorID(codespace string, code uint32) string {
return fmt.Sprintf("%s:%d", codespace, code)
}
func getUsed(codespace string, code uint32) *Error {
return usedCodes[errorID(codespace, code)]
}
func setUsed(err *Error) {
usedCodes[errorID(err.codespace, err.code)] = err
}
// ABCIError will resolve an error code/log from an abci result into
// an error message. If the code is registered, it will map it back to
// the canonical error, so we can do eg. ErrNotFound.Is(err) on something
// we get back from an external API.
//
// This should *only* be used in clients, not in the server side.
// The server (abci app / blockchain) should only refer to registered errors
func ABCIError(codespace string, code uint32, log string) error {
if e := getUsed(codespace, code); e != nil {
return Wrap(e, log)
}
// This is a unique error, will never match on .Is()
// Use Wrap here to get a stack trace
return Wrap(New(codespace, code, "unknown"), log)
}
// Error represents a root error.
//
// Weave framework is using root error to categorize issues. Each instance
// created during the runtime should wrap one of the declared root errors. This
// allows error tests and returning all errors to the client in a safe manner.
//
// All popular root errors are declared in this package. If an extension has to
// declare a custom root error, always use Register function to ensure
// error code uniqueness.
type Error struct {
codespace string
code uint32
desc string
}
func New(codespace string, code uint32, desc string) *Error {
return &Error{codespace: codespace, code: code, desc: desc}
}
func (e Error) Error() string {
return e.desc
}
func (e Error) ABCICode() uint32 {
return e.code
}
func (e Error) Codespace() string {
return e.codespace
}
// Is check if given error instance is of a given kind/type. This involves
// unwrapping given error using the Cause method if available.
func (e *Error) Is(err error) bool {
// Reflect usage is necessary to correctly compare with
// a nil implementation of an error.
if e == nil {
return isNilErr(err)
}
for {
if err == e {
return true
}
// If this is a collection of errors, this function must return
// true if at least one from the group match.
if u, ok := err.(unpacker); ok {
for _, er := range u.Unpack() {
if e.Is(er) {
return true
}
}
}
if c, ok := err.(causer); ok {
err = c.Cause()
} else {
return false
}
}
}
func isNilErr(err error) bool {
// Reflect usage is necessary to correctly compare with
// a nil implementation of an error.
if err == nil {
return true
}
if reflect.ValueOf(err).Kind() == reflect.Struct {
return false
}
return reflect.ValueOf(err).IsNil()
}
// Wrap extends given error with an additional information.
//
// If the wrapped error does not provide ABCICode method (ie. stdlib errors),
// it will be labeled as internal error.
//
// If err is nil, this returns nil, avoiding the need for an if statement when
// wrapping a error returned at the end of a function
func Wrap(err error, description string) error {
if err == nil {
return nil
}
// If this error does not carry the stacktrace information yet, attach
// one. This should be done only once per error at the lowest frame
// possible (most inner wrap).
if stackTrace(err) == nil {
err = errors.WithStack(err)
}
return &wrappedError{
parent: err,
msg: description,
}
}
func WrapNoStack(err error, description string) error {
if err == nil {
return nil
}
return &wrappedError{
parent: err,
msg: description,
}
}
// Wrapf extends given error with an additional information.
//
// This function works like Wrap function with additional functionality of
// formatting the input as specified.
func Wrapf(err error, format string, args ...interface{}) error {
desc := fmt.Sprintf(format, args...)
return Wrap(err, desc)
}
type wrappedError struct {
// This error layer description.
msg string
// The underlying error that triggered this one.
parent error
}
func (e *wrappedError) Error() string {
return strings.Join([]string{e.parent.Error(), e.msg}, ": ")
}
func (e *wrappedError) Cause() error {
return e.parent
}
// Is reports whether any error in e's chain matches a target.
func (e *wrappedError) Is(target error) bool {
if target == nil {
return e == target
}
w := e.Cause()
for {
if w == target {
return true
}
x, ok := w.(causer)
if ok {
w = x.Cause()
}
if x == nil {
return false
}
}
}
// Unwrap implements the built-in errors.Unwrap
func (e *wrappedError) Unwrap() error {
return e.parent
}
// Recover captures a panic and stop its propagation. If panic happens it is
// transformed into a ErrPanic instance and assigned to given error. Call this
// function using defer in order to work as expected.
func Recover(err *error) {
if r := recover(); r != nil {
*err = Wrapf(ErrPanic, "%v", r)
}
}
// WithType is a helper to augment an error with a corresponding type message
func WithType(err error, obj interface{}) error {
return Wrap(err, fmt.Sprintf("%T", obj))
}
// causer is an interface implemented by an error that supports wrapping. Use
// it to test if an error wraps another error instance.
type causer interface {
Cause() error
}
type unpacker interface {
Unpack() []error
}
func (e Error) Wrap(desc string) error { return Wrap(e, desc) }