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preprepare.go
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preprepare.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
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 simplebft
import (
"bytes"
"time"
"github.com/hyperledger/fabric/orderer/common/filter"
)
func (s *SBFT) sendPreprepare(batch []*Request, committers []filter.Committer) {
seq := s.nextSeq()
data := make([][]byte, len(batch))
for i, req := range batch {
data[i] = req.Payload
}
lasthash := hash(s.sys.LastBatch(s.chainId).Header)
m := &Preprepare{
Seq: &seq,
Batch: s.makeBatch(seq.Seq, lasthash, data),
}
s.sys.Persist(s.chainId, preprepared, m)
s.broadcast(&Msg{&Msg_Preprepare{m}})
log.Infof("replica %d: sendPreprepare", s.id)
s.handleCheckedPreprepare(m, committers)
}
func (s *SBFT) handlePreprepare(pp *Preprepare, src uint64) {
if src == s.id {
log.Infof("replica %d: ignoring preprepare from self: %d", s.id, src)
return
}
if src != s.primaryID() {
log.Infof("replica %d: preprepare from non-primary %d", s.id, src)
return
}
nextSeq := s.nextSeq()
if *pp.Seq != nextSeq {
log.Infof("replica %d: preprepare does not match expected %v, got %v", s.id, nextSeq, *pp.Seq)
return
}
if s.cur.subject.Seq.Seq == pp.Seq.Seq {
log.Infof("replica %d: duplicate preprepare for %v", s.id, *pp.Seq)
return
}
if pp.Batch == nil {
log.Infof("replica %d: preprepare without batches", s.id)
return
}
batchheader, err := s.checkBatch(pp.Batch, true, false)
if err != nil || batchheader.Seq != pp.Seq.Seq {
log.Infof("replica %d: preprepare %v batches head inconsistent from %d: %s", s.id, pp.Seq, src, err)
return
}
prevhash := s.sys.LastBatch(s.chainId).Hash()
if !bytes.Equal(batchheader.PrevHash, prevhash) {
log.Infof("replica %d: preprepare batches prev hash does not match expected %s, got %s", s.id, hash2str(batchheader.PrevHash), hash2str(prevhash))
return
}
committers := s.getCommitters(pp)
log.Infof("replica %d: handlePrepare", s.id)
s.handleCheckedPreprepare(pp, committers)
}
func (s *SBFT) acceptPreprepare(pp *Preprepare, committers []filter.Committer) {
sub := Subject{Seq: pp.Seq, Digest: pp.Batch.Hash()}
log.Infof("replica %d: accepting preprepare for %v, %x", s.id, sub.Seq, sub.Digest)
s.sys.Persist(s.chainId, preprepared, pp)
s.cur = reqInfo{
subject: sub,
timeout: s.sys.Timer(time.Duration(s.config.RequestTimeoutNsec)*time.Nanosecond, s.requestTimeout),
preprep: pp,
prep: make(map[uint64]*Subject),
commit: make(map[uint64]*Subject),
checkpoint: make(map[uint64]*Checkpoint),
committers: committers,
}
}
func (s *SBFT) getCommitters(pp *Preprepare) []filter.Committer {
// if we are the primary, we can be sure the block is OK
// and we also have the committers
// TODO what to do with the remaining ones???
// how to mantain the mapping between batches and committers?
var committers []filter.Committer
if !s.isPrimary() {
blockOK, allcommitters := s.getCommittersFromBlockCutter(pp.Batch)
if !blockOK {
log.Panicf("Replica %d found Byzantine block, Seq: %d View: %d", s.id, pp.Seq.Seq, pp.Seq.View)
}
committers = allcommitters
} else {
committers = s.primarycommitters[0]
s.primarycommitters = s.primarycommitters[1:]
}
return committers
}
func (s *SBFT) handleCheckedPreprepare(pp *Preprepare, committers []filter.Committer) {
s.acceptPreprepare(pp, committers)
if !s.isPrimary() {
s.sendPrepare()
s.processBacklog()
}
s.maybeSendCommit()
}
func (s *SBFT) getCommittersFromBlockCutter(reqBatch *Batch) (bool, []filter.Committer) {
reqs := make([]*Request, 0, len(reqBatch.Payloads))
for _, pl := range reqBatch.Payloads {
req := &Request{Payload: pl}
reqs = append(reqs, req)
}
batches := make([][]*Request, 0, 1)
comms := [][]filter.Committer{}
for _, r := range reqs {
b, c, accepted := s.sys.Ordered(s.chainId, r)
if !accepted {
return false, nil
}
batches = append(batches, b...)
comms = append(comms, c...)
}
if len(batches) > 1 || len(batches) != len(comms) {
return false, nil
}
if len(batches) == 0 {
_, committer := s.sys.Cut(s.chainId)
return true, committer
} else {
return true, comms[0]
}
}
////////////////////////////////////////////////
func (s *SBFT) requestTimeout() {
log.Infof("replica %d: request timed out: %s", s.id, s.cur.subject.Seq)
s.sendViewChange()
}