Move api errors to their own package and modify the typedef
max furman
5 years ago
parent
f033422ffa
commit
b9f6aacb0f
@ -0,0 +1,250 @@
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package errs
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"github.com/pkg/errors"
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)
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// StatusCoder interface is used by errors that returns the HTTP response code.
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type StatusCoder interface {
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StatusCode() int
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}
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// StackTracer must be by those errors that return an stack trace.
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type StackTracer interface {
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StackTrace() errors.StackTrace
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}
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// Option modifies the Error type.
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type Option func(e *Error) error
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// WithMessage returns an Option that modifies the error by overwriting the
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// message only if it is empty.
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func WithMessage(format string, args ...interface{}) Option {
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return func(e *Error) error {
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if len(e.Msg) > 0 {
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return e
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}
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e.Msg = fmt.Sprintf(format, args...)
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return e
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}
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}
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// Error represents the CA API errors.
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type Error struct {
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Status int
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Err error
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Msg string
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}
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// New returns a new Error. If the given error implements the StatusCoder
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// interface we will ignore the given status.
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func New(status int, err error, opts ...Option) error {
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var e *Error
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if sc, ok := err.(StatusCoder); ok {
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e = &Error{Status: sc.StatusCode(), Err: err}
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} else {
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cause := errors.Cause(err)
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if sc, ok := cause.(StatusCoder); ok {
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e = &Error{Status: sc.StatusCode(), Err: err}
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} else {
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e = &Error{Status: status, Err: err}
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}
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}
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for _, o := range opts {
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o(e)
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}
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return e
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}
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// ErrorResponse represents an error in JSON format.
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type ErrorResponse struct {
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Status int `json:"status"`
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Message string `json:"message"`
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}
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// Cause implements the errors.Causer interface and returns the original error.
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func (e *Error) Cause() error {
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return e.Err
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}
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// Error implements the error interface and returns the error string.
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func (e *Error) Error() string {
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return e.Err.Error()
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}
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// StatusCode implements the StatusCoder interface and returns the HTTP response
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// code.
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func (e *Error) StatusCode() int {
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return e.Status
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}
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// Message returns a user friendly error, if one is set.
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func (e *Error) Message() string {
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if len(e.Msg) > 0 {
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return e.Msg
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}
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return e.Err.Error()
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}
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// Wrap returns an error annotating err with a stack trace at the point Wrap is
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// called, and the supplied message. If err is nil, Wrap returns nil.
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func Wrap(status int, e error, m string, opts ...Option) error {
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if e == nil {
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return nil
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}
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if err, ok := e.(*Error); ok {
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err.Err = errors.Wrap(err.Err, m)
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e = err
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} else {
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e = errors.Wrap(e, m)
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}
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return StatusCodeError(status, e, opts...)
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}
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// Wrapf returns an error annotating err with a stack trace at the point Wrap is
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// called, and the supplied message. If err is nil, Wrap returns nil.
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func Wrapf(status int, e error, format string, args ...interface{}) error {
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if e == nil {
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return nil
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}
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var opts []Option
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for i, arg := range args {
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// Once we find the first Option, assume that all further arguments are Options.
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if _, ok := arg.(Option); ok {
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for _, a := range args[i:] {
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// Ignore any arguments after the first Option that are not Options.
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if opt, ok := a.(Option); ok {
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opts = append(opts, opt)
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}
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}
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args = args[:i]
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break
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}
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}
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if err, ok := e.(*Error); ok {
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err.Err = errors.Wrapf(err.Err, format, args...)
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e = err
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} else {
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e = errors.Wrapf(e, format, args...)
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}
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return StatusCodeError(status, e, opts...)
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}
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// MarshalJSON implements json.Marshaller interface for the Error struct.
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func (e *Error) MarshalJSON() ([]byte, error) {
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var msg string
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if len(e.Msg) > 0 {
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msg = e.Msg
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} else {
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msg = http.StatusText(e.Status)
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}
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return json.Marshal(&ErrorResponse{Status: e.Status, Message: msg})
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}
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// UnmarshalJSON implements json.Unmarshaler interface for the Error struct.
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func (e *Error) UnmarshalJSON(data []byte) error {
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var er ErrorResponse
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if err := json.Unmarshal(data, &er); err != nil {
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return err
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}
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e.Status = er.Status
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e.Err = fmt.Errorf(er.Message)
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return nil
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}
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// Format implements the fmt.Formatter interface.
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func (e *Error) Format(f fmt.State, c rune) {
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if err, ok := e.Err.(fmt.Formatter); ok {
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err.Format(f, c)
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return
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}
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fmt.Fprint(f, e.Err.Error())
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}
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// Messenger is a friendly message interface that errors can implement.
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type Messenger interface {
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Message() string
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}
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// StatusCodeError selects the proper error based on the status code.
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func StatusCodeError(code int, e error, opts ...Option) error {
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switch code {
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case http.StatusBadRequest:
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return BadRequest(e, opts...)
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case http.StatusUnauthorized:
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return Unauthorized(e, opts...)
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case http.StatusForbidden:
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return Forbidden(e, opts...)
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case http.StatusInternalServerError:
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return InternalServerError(e, opts...)
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case http.StatusNotImplemented:
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return NotImplemented(e, opts...)
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default:
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return UnexpectedError(code, e, opts...)
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}
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}
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var seeLogs = "Please see the certificate authority logs for more info."
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// InternalServerError returns a 500 error with the given error.
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func InternalServerError(err error, opts ...Option) error {
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if len(opts) == 0 {
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opts = append(opts, WithMessage("The certificate authority encountered an Internal Server Error. "+seeLogs))
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}
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return New(http.StatusInternalServerError, err, opts...)
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}
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// NotImplemented returns a 501 error with the given error.
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func NotImplemented(err error, opts ...Option) error {
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if len(opts) == 0 {
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opts = append(opts, WithMessage("The requested method is not implemented by the certificate authority. "+seeLogs))
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}
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return New(http.StatusNotImplemented, err, opts...)
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}
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// BadRequest returns an 400 error with the given error.
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func BadRequest(err error, opts ...Option) error {
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if len(opts) == 0 {
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opts = append(opts, WithMessage("The request could not be completed due to being poorly formatted or "+
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"missing critical data. "+seeLogs))
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}
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return New(http.StatusBadRequest, err, opts...)
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}
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// Unauthorized returns an 401 error with the given error.
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func Unauthorized(err error, opts ...Option) error {
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if len(opts) == 0 {
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opts = append(opts, WithMessage("The request lacked necessary authorization to be completed. "+seeLogs))
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}
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return New(http.StatusUnauthorized, err, opts...)
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}
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// Forbidden returns an 403 error with the given error.
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func Forbidden(err error, opts ...Option) error {
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if len(opts) == 0 {
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opts = append(opts, WithMessage("The request was Forbidden by the certificate authority. "+seeLogs))
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}
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return New(http.StatusForbidden, err, opts...)
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}
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// NotFound returns an 404 error with the given error.
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func NotFound(err error, opts ...Option) error {
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if len(opts) == 0 {
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opts = append(opts, WithMessage("The requested resource could not be found. "+seeLogs))
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}
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return New(http.StatusNotFound, err, opts...)
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}
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// UnexpectedError will be used when the certificate authority makes an outgoing
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// request and receives an unhandled status code.
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func UnexpectedError(code int, err error, opts ...Option) error {
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if len(opts) == 0 {
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opts = append(opts, WithMessage("The certificate authority received an "+
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"unexpected HTTP status code - '%d'. "+seeLogs, code))
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}
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return New(code, err, opts...)
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}
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