micro/errors/errors.go

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// Package errors provides a way to return detailed information
// for an RPC request error. The error is normally JSON encoded.
package errors
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import (
"bytes"
"context"
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"encoding/json"
"errors"
"fmt"
"io"
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"net/http"
"strconv"
"strings"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
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)
var (
// ErrBadRequest returns then requests contains invalid data
ErrBadRequest = &Error{Code: 400}
// ErrUnauthorized returns then user have unauthorized call
ErrUnauthorized = &Error{Code: 401}
// ErrForbidden returns then user have not access the resource
ErrForbidden = &Error{Code: 403}
// ErrNotFound returns then user specify invalid endpoint
ErrNotFound = &Error{Code: 404}
// ErrMethodNotAllowed returns then user try to get invalid method
ErrMethodNotAllowed = &Error{Code: 405}
// ErrTimeout returns then timeout exceeded
ErrTimeout = &Error{Code: 408}
// ErrConflict returns then request create duplicate resource
ErrConflict = &Error{Code: 409}
// ErrInternalServerError returns then server cant process request because of internal error
ErrInternalServerError = &Error{Code: 500}
// ErNotImplemented returns then server does not have desired endpoint method
ErNotImplemented = &Error{Code: 501}
// ErrBadGateway returns then server cant process request
ErrBadGateway = &Error{Code: 502}
// ErrServiceUnavailable returns then service unavailable
ErrServiceUnavailable = &Error{Code: 503}
// ErrGatewayTimeout returns then server have long time to process request
ErrGatewayTimeout = &Error{Code: 504}
)
const ProblemContentType = "application/problem+json"
type Problem struct {
Type string `json:"type,omitempty"`
Title string `json:"title,omitempty"`
Detail string `json:"detail,omitempty"`
Instance string `json:"instance,omitempty"`
Errors []struct {
Title string `json:"title,omitempty"`
Detail string `json:"detail,omitempty"`
} `json:"errors,omitempty"`
Status int `json:"status,omitempty"`
}
// Error type
type Error struct {
// ID holds error id or service, usually someting like my_service or id
ID string
// Detail holds some useful details about error
Detail string
// Status usually holds text of http status
Status string
// Code holds error code
Code int32
}
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// Error satisfies error interface
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func (e *Error) Error() string {
b, _ := json.Marshal(e)
return string(b)
}
/*
// Generator struct holds id of error
type Generator struct {
id string
}
// Generator can emit new error with static id
func NewGenerator(id string) *Generator {
return &Generator{id: id}
}
func (g *Generator) BadRequest(format string, args ...interface{}) error {
return BadRequest(g.id, format, args...)
}
*/
// New generates a custom error
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func New(id, detail string, code int32) error {
return &Error{
ID: id,
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Code: code,
Detail: detail,
Status: http.StatusText(int(code)),
}
}
// Parse tries to parse a JSON string into an error. If that
// fails, it will set the given string as the error detail.
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func Parse(err string) *Error {
e := &Error{}
nerr := json.Unmarshal([]byte(err), e)
if nerr != nil {
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e.Detail = err
}
return e
}
// BadRequest generates a 400 error.
func BadRequest(id, format string, args ...interface{}) error {
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return &Error{
ID: id,
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Code: 400,
Detail: fmt.Sprintf(format, args...),
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Status: http.StatusText(400),
}
}
// Unauthorized generates a 401 error.
func Unauthorized(id, format string, args ...interface{}) error {
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return &Error{
ID: id,
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Code: 401,
Detail: fmt.Sprintf(format, args...),
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Status: http.StatusText(401),
}
}
// Forbidden generates a 403 error.
func Forbidden(id, format string, args ...interface{}) error {
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return &Error{
ID: id,
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Code: 403,
Detail: fmt.Sprintf(format, args...),
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Status: http.StatusText(403),
}
}
// NotFound generates a 404 error.
func NotFound(id, format string, args ...interface{}) error {
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return &Error{
ID: id,
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Code: 404,
Detail: fmt.Sprintf(format, args...),
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Status: http.StatusText(404),
}
}
// MethodNotAllowed generates a 405 error.
func MethodNotAllowed(id, format string, args ...interface{}) error {
return &Error{
ID: id,
Code: 405,
Detail: fmt.Sprintf(format, args...),
Status: http.StatusText(405),
}
}
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// Timeout generates a 408 error.
func Timeout(id, format string, args ...interface{}) error {
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return &Error{
ID: id,
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Code: 408,
Detail: fmt.Sprintf(format, args...),
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Status: http.StatusText(408),
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}
}
// Conflict generates a 409 error.
func Conflict(id, format string, args ...interface{}) error {
return &Error{
ID: id,
Code: 409,
Detail: fmt.Sprintf(format, args...),
Status: http.StatusText(409),
}
}
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// InternalServerError generates a 500 error.
func InternalServerError(id, format string, args ...interface{}) error {
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return &Error{
ID: id,
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Code: 500,
Detail: fmt.Sprintf(format, args...),
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Status: http.StatusText(500),
}
}
// NotImplemented generates a 501 error
func NotImplemented(id, format string, args ...interface{}) error {
return &Error{
ID: id,
Code: 501,
Detail: fmt.Sprintf(format, args...),
Status: http.StatusText(501),
}
}
// BadGateway generates a 502 error
func BadGateway(id, format string, args ...interface{}) error {
return &Error{
ID: id,
Code: 502,
Detail: fmt.Sprintf(format, args...),
Status: http.StatusText(502),
}
}
// ServiceUnavailable generates a 503 error
func ServiceUnavailable(id, format string, args ...interface{}) error {
return &Error{
ID: id,
Code: 503,
Detail: fmt.Sprintf(format, args...),
Status: http.StatusText(503),
}
}
// GatewayTimeout generates a 504 error
func GatewayTimeout(id, format string, args ...interface{}) error {
return &Error{
ID: id,
Code: 504,
Detail: fmt.Sprintf(format, args...),
Status: http.StatusText(504),
}
}
// Equal tries to compare errors
func Equal(err1 error, err2 error) bool {
verr1, ok1 := err1.(*Error)
verr2, ok2 := err2.(*Error)
if ok1 != ok2 {
return false
}
if !ok1 {
return err1 == err2
}
if verr1.Code != verr2.Code {
return false
}
return true
}
// CodeIn return true if err has specified code
func CodeIn(err interface{}, codes ...int32) bool {
var code int32
switch verr := err.(type) {
case *Error:
code = verr.Code
case int32:
code = verr
default:
return false
}
for _, check := range codes {
if code == check {
return true
}
}
return false
}
// FromError try to convert go error to *Error
func FromError(err error) *Error {
if err == nil {
return nil
}
if verr, ok := err.(*Error); ok && verr != nil {
return verr
}
return Parse(err.Error())
}
// MarshalJSON returns error data
func (e *Error) MarshalJSON() ([]byte, error) {
return e.Marshal()
}
// UnmarshalJSON set error data
func (e *Error) UnmarshalJSON(data []byte) error {
return e.Unmarshal(data)
}
// ProtoMessage noop func
func (e *Error) ProtoMessage() {}
// Reset resets error
func (e *Error) Reset() {
*e = Error{}
}
// String returns error as string
func (e *Error) String() string {
return fmt.Sprintf(`{"id":"%s","detail":"%s","status":"%s","code":%d}`, addslashes(e.ID), addslashes(e.Detail), addslashes(e.Status), e.Code)
}
// Marshal returns error data
func (e *Error) Marshal() ([]byte, error) {
return []byte(e.String()), nil
}
// Unmarshal set error data
func (e *Error) Unmarshal(data []byte) error {
str := string(data)
if len(data) < 41 {
return fmt.Errorf("invalid data")
}
parts := strings.FieldsFunc(str[1:len(str)-1], func(r rune) bool {
return r == ','
})
for _, part := range parts {
nparts := strings.FieldsFunc(part, func(r rune) bool {
return r == ':'
})
for idx := 0; idx < len(nparts)/2; idx += 2 {
val := strings.Trim(nparts[idx+1], `"`)
if len(val) == 0 {
continue
}
switch {
case nparts[idx] == `"id"`:
e.ID = val
case nparts[idx] == `"detail"`:
e.Detail = val
case nparts[idx] == `"status"`:
e.Status = val
case nparts[idx] == `"code"`:
c, err := strconv.ParseInt(val, 10, 32)
if err != nil {
return err
}
e.Code = int32(c)
}
idx++
}
}
return nil
}
func addslashes(str string) string {
var buf bytes.Buffer
for _, char := range str {
switch char {
case '\'', '"', '\\':
buf.WriteRune('\\')
}
buf.WriteRune(char)
}
return buf.String()
}
type retryableError struct {
err error
}
// Retryable returns error that can be retried later
func Retryable(err error) error {
return &retryableError{err: err}
}
type IsRetryableFunc func(error) bool
var (
RetrayableOracleErrors = []IsRetryableFunc{
func(err error) bool {
errmsg := err.Error()
switch {
case strings.Contains(errmsg, `ORA-`):
return true
case strings.Contains(errmsg, `can not assign`):
return true
case strings.Contains(errmsg, `can't assign`):
return true
}
return false
},
}
RetrayablePostgresErrors = []IsRetryableFunc{
func(err error) bool {
errmsg := err.Error()
switch {
case strings.Contains(errmsg, `number of field descriptions must equal number of`):
return true
case strings.Contains(errmsg, `not a pointer`):
return true
case strings.Contains(errmsg, `values, but dst struct has only`):
return true
case strings.Contains(errmsg, `struct doesn't have corresponding row field`):
return true
case strings.Contains(errmsg, `cannot find field`):
return true
case strings.Contains(errmsg, `cannot scan`) || strings.Contains(errmsg, `cannot convert`):
return true
case strings.Contains(errmsg, `failed to connect to`):
return true
}
return false
},
}
RetryableMicroErrors = []IsRetryableFunc{
func(err error) bool {
switch verr := err.(type) {
case *Error:
switch verr.Code {
case 401, 403, 408, 500, 501, 502, 503, 504:
return true
default:
return false
}
case *retryableError:
return true
}
return false
},
}
RetryableGoErrors = []IsRetryableFunc{
func(err error) bool {
switch verr := err.(type) {
case interface{ SafeToRetry() bool }:
return verr.SafeToRetry()
case interface{ Timeout() bool }:
return verr.Timeout()
}
switch {
case errors.Is(err, io.EOF), errors.Is(err, io.ErrUnexpectedEOF):
return true
case errors.Is(err, context.DeadlineExceeded):
return true
case errors.Is(err, io.ErrClosedPipe), errors.Is(err, io.ErrShortBuffer), errors.Is(err, io.ErrShortWrite):
return true
}
return false
},
}
RetryableGrpcErrors = []IsRetryableFunc{
func(err error) bool {
st, ok := status.FromError(err)
if !ok {
return false
}
switch st.Code() {
case codes.Unavailable, codes.ResourceExhausted:
return true
case codes.DeadlineExceeded:
return true
case codes.Internal:
switch {
case strings.Contains(st.Message(), `transport: received the unexpected content-type "text/html; charset=UTF-8"`):
return true
case strings.Contains(st.Message(), io.ErrUnexpectedEOF.Error()):
return true
case strings.Contains(st.Message(), `stream terminated by RST_STREAM with error code: INTERNAL_ERROR`):
return true
}
}
return false
},
}
)
// Unwrap provides error wrapping
func (e *retryableError) Unwrap() error {
return e.err
}
// Error returns the error string
func (e *retryableError) Error() string {
if e.err == nil {
return ""
}
return e.err.Error()
}
// IsRetryable checks error for ability to retry later
func IsRetryable(err error, fns ...IsRetryableFunc) bool {
for _, fn := range fns {
if ok := fn(err); ok {
return true
}
}
return false
}