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error_handler.middleware.go
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error_handler.middleware.go
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package respond
import (
"fmt"
"log"
"net/http"
"respond/middleware"
)
type ServerErrorEndpointFunc func(http.ResponseWriter, *http.Request, error) error
type StatusCodedError interface {
HTTPStatusCode() int
}
type ErrorHandlerMiddleware struct {
ServerErrorEndpoint ServerErrorEndpointFunc
}
func NewErrorHandlerMiddleware(errorPageEndpoint ServerErrorEndpointFunc) *ErrorHandlerMiddleware {
return &ErrorHandlerMiddleware{
ServerErrorEndpoint: errorPageEndpoint,
}
}
func (errorHandler *ErrorHandlerMiddleware) Process(response http.ResponseWriter, request *http.Request,
next middleware.NextFunc) (returnError error) {
defer func() {
if recovered := recover(); recovered != nil {
var err error
if e, ok := recovered.(error); ok {
err = e
} else {
err = fmt.Errorf("%+v", recovered)
}
log.Println(fmt.Sprintf("respond: unhandled error: %s", err))
if statusCodedError, ok := err.(StatusCodedError); ok {
response.WriteHeader(statusCodedError.HTTPStatusCode())
} else {
response.WriteHeader(500)
}
err = errorHandler.ServerErrorEndpoint(response, request, err)
if err != nil {
returnError = fmt.Errorf("%s", err)
}
}
}()
if err := next(response); err != nil {
panic(err)
}
return nil
}