mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-21 04:20:23 +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
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package routine
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import (
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"context"
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"net/http"
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"k8s.io/apiserver/pkg/endpoints/request"
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)
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type taskKeyType int
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const taskKey taskKeyType = iota
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type Task struct {
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Func func()
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}
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func WithTask(parent context.Context, t *Task) context.Context {
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return request.WithValue(parent, taskKey, t)
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}
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// AppendTask appends a task executed after completion of existing task.
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// It is a no-op if there is no existing task.
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func AppendTask(ctx context.Context, t *Task) bool {
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if existTask := TaskFrom(ctx); existTask != nil && existTask.Func != nil {
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existFunc := existTask.Func
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existTask.Func = func() {
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existFunc()
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t.Func()
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}
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return true
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}
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return false
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}
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func TaskFrom(ctx context.Context) *Task {
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t, _ := ctx.Value(taskKey).(*Task)
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return t
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}
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// WithRoutine returns an http.Handler that executes preparation of long running requests (i.e. watches)
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// in a separate Goroutine and then serves the long running request in the main Goroutine. Doing so allows
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// freeing stack memory used in preparation Goroutine for better memory efficiency.
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func WithRoutine(handler http.Handler, longRunning request.LongRunningRequestCheck) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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ctx := req.Context()
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requestInfo, _ := request.RequestInfoFrom(ctx)
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if !longRunning(req, requestInfo) {
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handler.ServeHTTP(w, req)
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return
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}
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req = req.WithContext(WithTask(ctx, &Task{}))
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panicCh := make(chan any, 1)
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go func() {
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defer func() {
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if r := recover(); r != nil {
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panicCh <- r
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}
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close(panicCh)
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}()
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handler.ServeHTTP(w, req)
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}()
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if p, ok := <-panicCh; ok {
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panic(p)
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}
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ctx = req.Context()
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if t := TaskFrom(ctx); t != nil && t.Func != nil {
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t.Func()
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}
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})
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}
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