forked from vulcand/oxy
/
handler.go
62 lines (49 loc) · 1.6 KB
/
handler.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
package utils
import (
"context"
"io"
"net"
"net/http"
log "github.com/sirupsen/logrus"
)
// 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{}
// StdHandler Standard error handler
type StdHandler struct{}
func (e *StdHandler) ServeHTTP(w http.ResponseWriter, req *http.Request, err error) {
statusCode := http.StatusInternalServerError
if e, ok := err.(net.Error); ok {
if e.Timeout() {
statusCode = http.StatusGatewayTimeout
} else {
statusCode = http.StatusBadGateway
}
} else if err == io.EOF {
statusCode = http.StatusBadGateway
} else if err == context.Canceled {
statusCode = StatusClientClosedRequest
}
w.WriteHeader(statusCode)
w.Write([]byte(statusText(statusCode)))
log.Debugf("'%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)
}