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contextmanager.go
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contextmanager.go
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/*
* Copyright 2018-2022, CS Systemes d'Information, http://csgroup.eu
*
* 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 utils
import (
"context"
"sync"
"time"
uuid "github.com/gofrs/uuid"
"google.golang.org/grpc/metadata"
"github.com/CS-SI/SafeScale/v21/lib/utils/fail"
)
var clientRPCUUID uuid.UUID
var uuidSet bool
var mutexContextManager sync.Mutex
// --------------------- CLIENT ---------------------------------
// GetContext ...
func GetContext(storeUUID bool) (context.Context, fail.Error) {
clientContext := context.Background()
aUUID, xerr := generateUUID(storeUUID)
if xerr != nil {
return nil, xerr
}
clientContext = metadata.AppendToOutgoingContext(clientContext, "UUID", aUUID)
return clientContext, nil
}
// GetTimeoutContext return a context for gRPC commands
func GetTimeoutContext(parentCtx context.Context, timeout time.Duration) (context.Context, context.CancelFunc, fail.Error) {
if parentCtx != context.TODO() { // nolint
ctx, cancel := context.WithTimeout(parentCtx, timeout)
return ctx, cancel, nil
}
aContext, xerr := GetContext(true)
if xerr != nil {
return nil, nil, xerr
}
ctx, cancel := context.WithTimeout(aContext, timeout)
return ctx, cancel, nil
}
// GetUUID ...
func GetUUID() string {
mutexContextManager.Lock()
defer mutexContextManager.Unlock()
return clientRPCUUID.String()
}
// generateUUID ...
func generateUUID(store bool) (string, fail.Error) {
mutexContextManager.Lock()
defer mutexContextManager.Unlock()
newUUID, err := uuid.NewV4()
if err != nil {
return "", fail.ConvertError(err)
}
if store {
uuidSet = true
clientRPCUUID = newUUID
}
return newUUID.String(), nil
}