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inflight.go
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inflight.go
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/*
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 internal
import (
"sync"
"k8s.io/klog/v2"
)
// Idempotent is the interface required to manage in flight requests.
type Idempotent interface {
// String The CSI data types are generated using a protobuf.
// The generated structures are guaranteed to implement the Stringer interface.
// Example: https://github.com/container-storage-interface/spec/blob/master/lib/go/csi/csi.pb.go#L3508
// We can use the generated string as the key of our internal inflight database of requests.
String() string
}
const (
VolumeOperationAlreadyExistsErrorMsg = "An operation with the given volume %s already exists"
)
// InFlight is a struct used to manage in flight requests
type InFlight struct {
mux *sync.Mutex
inFlight map[string]bool
}
// NewInFlight instantiates an InFlight structure.
func NewInFlight() *InFlight {
return &InFlight{
mux: &sync.Mutex{},
inFlight: make(map[string]bool),
}
}
// Insert inserts the entry to the current list of inflight requests.
// Returns false if the key already exists.
func (db *InFlight) Insert(key string) bool {
db.mux.Lock()
defer db.mux.Unlock()
_, ok := db.inFlight[key]
if ok {
return false
}
db.inFlight[key] = true
return true
}
// Delete removes the entry from the inFlight entries map.
// It doesn't return anything, and will do nothing if the specified key doesn't exist.
func (db *InFlight) Delete(key string) {
db.mux.Lock()
defer db.mux.Unlock()
delete(db.inFlight, key)
klog.V(4).InfoS("Volume operation finished", "key", key)
}