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txn_queue.go
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txn_queue.go
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// Copyright (c) 2018 Cisco and/or its affiliates.
//
// 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 kvscheduler
import (
"context"
"time"
"github.com/ligato/cn-infra/logging"
kvs "github.com/ligato/vpp-agent/plugins/kvscheduler/api"
)
// enqueueTxn adds transaction into the FIFO queue (channel) for execution.
func (s *Scheduler) enqueueTxn(txn *transaction) error {
if txn.ctx == nil {
txn.ctx = context.TODO()
}
//trace.Log(txn.ctx, "txn", "enqueue")
if txn.txnType == kvs.NBTransaction && txn.nb.isBlocking {
select {
case <-s.ctx.Done():
return kvs.ErrClosedScheduler
case s.txnQueue <- txn:
return nil
}
}
select {
case <-s.ctx.Done():
return kvs.ErrClosedScheduler
case s.txnQueue <- txn:
return nil
default:
return kvs.ErrTxnQueueFull
}
}
// dequeueTxn pulls the oldest queued transaction.
func (s *Scheduler) dequeueTxn() (txn *transaction, canceled bool) {
select {
case <-s.ctx.Done():
return nil, true
case txn = <-s.txnQueue:
//trace.Log(txn.ctx, "txn", "dequeue")
return txn, false
}
}
// enqueueRetry schedules retry for failed operations.
func (s *Scheduler) enqueueRetry(args *retryTxn) {
go s.delayRetry(args)
}
// delayRetry postpones retry until a given time period has elapsed.
func (s *Scheduler) delayRetry(args *retryTxn) {
s.wg.Add(1)
defer s.wg.Done()
select {
case <-s.ctx.Done():
return
case <-time.After(args.delay):
err := s.enqueueTxn(&transaction{
txnType: kvs.RetryFailedOps,
retry: args,
})
if err != nil {
s.Log.WithFields(logging.Fields{
"txnSeqNum": args.txnSeqNum,
"err": err,
}).Warn("Failed to enqueue re-try for failed operations")
s.enqueueRetry(args) // try again with the same time period
}
}
}