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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package state
import (
"sync"
"sync/atomic"
"github.com/hyperledger/fabric/gossip/util"
proto "github.com/hyperledger/fabric/protos/gossip"
"github.com/op/go-logging"
)
// PayloadsBuffer is used to store payloads into which used to
// support payloads with blocks reordering according to the
// sequence numbers. It also will provide the capability
// to signal whenever expected block has arrived.
type PayloadsBuffer interface {
// Adds new block into the buffer
Push(payload *proto.Payload)
// Returns next expected sequence number
Next() uint64
// Remove and return payload with given sequence number
Pop() *proto.Payload
// Get current buffer size
Size() int
// Channel to indicate event when new payload pushed with sequence
// number equal to the next expected value.
Ready() chan struct{}
Close()
}
// PayloadsBufferImpl structure to implement PayloadsBuffer interface
// store inner state of available payloads and sequence numbers
type PayloadsBufferImpl struct {
next uint64
buf map[uint64]*proto.Payload
readyChan chan struct{}
mutex sync.RWMutex
logger *logging.Logger
}
// NewPayloadsBuffer is factory function to create new payloads buffer
func NewPayloadsBuffer(next uint64) PayloadsBuffer {
return &PayloadsBufferImpl{
buf: make(map[uint64]*proto.Payload),
readyChan: make(chan struct{}, 0),
next: next,
logger: util.GetLogger(util.LoggingStateModule, ""),
}
}
// Ready function returns the channel which indicates whenever expected
// next block has arrived and one could safely pop out
// next sequence of blocks
func (b *PayloadsBufferImpl) Ready() chan struct{} {
return b.readyChan
}
// Push new payload into the buffer structure in case new arrived payload
// sequence number is below the expected next block number payload will be
// thrown away and error will be returned.
func (b *PayloadsBufferImpl) Push(payload *proto.Payload) {
b.mutex.Lock()
defer b.mutex.Unlock()
seqNum := payload.SeqNum
if seqNum < b.next || b.buf[seqNum] != nil {
logger.Debugf("Payload with sequence number = %d has been already processed", payload.SeqNum)
return
}
b.buf[seqNum] = payload
// Send notification that next sequence has arrived
if seqNum == b.next {
// Do not block execution of current routine
go func() {
b.readyChan <- struct{}{}
}()
}
}
// Next function provides the number of the next expected block
func (b *PayloadsBufferImpl) Next() uint64 {
// Atomically read the value of the top sequence number
return atomic.LoadUint64(&b.next)
}
// Pop function extracts the payload according to the next expected block
// number, if no next block arrived yet, function returns nil.
func (b *PayloadsBufferImpl) Pop() *proto.Payload {
b.mutex.Lock()
defer b.mutex.Unlock()
result := b.buf[b.Next()]
if result != nil {
// If there is such sequence in the buffer need to delete it
delete(b.buf, b.Next())
// Increment next expect block index
atomic.AddUint64(&b.next, 1)
}
return result
}
// Size returns current number of payloads stored within buffer
func (b *PayloadsBufferImpl) Size() int {
b.mutex.RLock()
defer b.mutex.RUnlock()
return len(b.buf)
}
// Close cleanups resources and channels in maintained
func (b *PayloadsBufferImpl) Close() {
close(b.readyChan)
}
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