mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-29 17:50:23 +00:00
5a66991bb3
updating the kubernetes release to the latest in main go.mod Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
/*
|
|
Copyright 2023 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 routine
|
|
|
|
import (
|
|
"context"
|
|
"net/http"
|
|
|
|
"k8s.io/apiserver/pkg/endpoints/request"
|
|
)
|
|
|
|
type taskKeyType int
|
|
|
|
const taskKey taskKeyType = iota
|
|
|
|
type Task struct {
|
|
Func func()
|
|
}
|
|
|
|
func WithTask(parent context.Context, t *Task) context.Context {
|
|
return request.WithValue(parent, taskKey, t)
|
|
}
|
|
|
|
// AppendTask appends a task executed after completion of existing task.
|
|
// It is a no-op if there is no existing task.
|
|
func AppendTask(ctx context.Context, t *Task) bool {
|
|
if existTask := TaskFrom(ctx); existTask != nil && existTask.Func != nil {
|
|
existFunc := existTask.Func
|
|
existTask.Func = func() {
|
|
existFunc()
|
|
t.Func()
|
|
}
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func TaskFrom(ctx context.Context) *Task {
|
|
t, _ := ctx.Value(taskKey).(*Task)
|
|
return t
|
|
}
|
|
|
|
// WithRoutine returns an http.Handler that executes preparation of long running requests (i.e. watches)
|
|
// in a separate Goroutine and then serves the long running request in the main Goroutine. Doing so allows
|
|
// freeing stack memory used in preparation Goroutine for better memory efficiency.
|
|
func WithRoutine(handler http.Handler, longRunning request.LongRunningRequestCheck) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
|
|
ctx := req.Context()
|
|
requestInfo, _ := request.RequestInfoFrom(ctx)
|
|
if !longRunning(req, requestInfo) {
|
|
handler.ServeHTTP(w, req)
|
|
return
|
|
}
|
|
|
|
req = req.WithContext(WithTask(ctx, &Task{}))
|
|
panicCh := make(chan any, 1)
|
|
go func() {
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
panicCh <- r
|
|
}
|
|
close(panicCh)
|
|
}()
|
|
handler.ServeHTTP(w, req)
|
|
}()
|
|
|
|
if p, ok := <-panicCh; ok {
|
|
panic(p)
|
|
}
|
|
|
|
ctx = req.Context()
|
|
if t := TaskFrom(ctx); t != nil && t.Func != nil {
|
|
t.Func()
|
|
}
|
|
|
|
})
|
|
}
|