-
Notifications
You must be signed in to change notification settings - Fork 39.2k
/
errors.go
56 lines (47 loc) · 1.78 KB
/
errors.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
/*
Copyright 2016 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package streaming
import (
"fmt"
"net/http"
"strconv"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
func ErrorStreamingDisabled(method string) error {
return status.Errorf(codes.NotFound, fmt.Sprintf("streaming method %s disabled", method))
}
// The error returned when the maximum number of in-flight requests is exceeded.
func ErrorTooManyInFlight() error {
return status.Errorf(codes.ResourceExhausted, "maximum number of in-flight requests exceeded")
}
// Translates a CRI streaming error into an appropriate HTTP response.
func WriteError(err error, w http.ResponseWriter) error {
var status int
switch grpc.Code(err) {
case codes.NotFound:
status = http.StatusNotFound
case codes.ResourceExhausted:
// We only expect to hit this if there is a DoS, so we just wait the full TTL.
// If this is ever hit in steady-state operations, consider increasing the MaxInFlight requests,
// or plumbing through the time to next expiration.
w.Header().Set("Retry-After", strconv.Itoa(int(CacheTTL.Seconds())))
status = http.StatusTooManyRequests
default:
status = http.StatusInternalServerError
}
w.WriteHeader(status)
_, writeErr := w.Write([]byte(err.Error()))
return writeErr
}