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package utils
import (
"context"
"errors"
"io"
"net"
"net/http"
)
// StatusClientClosedRequest non-standard HTTP status code for client disconnection.
const StatusClientClosedRequest = 499
// StatusClientClosedRequestText non-standard HTTP status for client disconnection.
const StatusClientClosedRequestText = "Client Closed Request"
// ErrorHandler error handler.
type ErrorHandler interface {
ServeHTTP(w http.ResponseWriter, req *http.Request, err error)
}
// DefaultHandler default error handler.
var DefaultHandler ErrorHandler = &StdHandler{log: &NoopLogger{}}
// StdHandler Standard error handler.
type StdHandler struct {
log Logger
}
func (e *StdHandler) ServeHTTP(w http.ResponseWriter, _ *http.Request, err error) {
statusCode := http.StatusInternalServerError
//nolint:errorlint // must be changed
if e, ok := err.(net.Error); ok {
if e.Timeout() {
statusCode = http.StatusGatewayTimeout
} else {
statusCode = http.StatusBadGateway
}
} else if errors.Is(err, io.EOF) {
statusCode = http.StatusBadGateway
} else if errors.Is(err, context.Canceled) {
statusCode = StatusClientClosedRequest
}
w.WriteHeader(statusCode)
_, _ = w.Write([]byte(statusText(statusCode)))
e.log.Debug("'%d %s' caused by: %v", statusCode, statusText(statusCode), err)
}
func statusText(statusCode int) string {
if statusCode == StatusClientClosedRequest {
return StatusClientClosedRequestText
}
return http.StatusText(statusCode)
}
// ErrorHandlerFunc error handler function type.
type ErrorHandlerFunc func(http.ResponseWriter, *http.Request, error)
// ServeHTTP calls f(w, r).
func (f ErrorHandlerFunc) ServeHTTP(w http.ResponseWriter, r *http.Request, err error) {
f(w, r, err)
}
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