github.com/adnan-c/fabric_e2e_couchdb@v0.6.1-preview.0.20170228180935-21ce6b23cf91/orderer/sbft/simplebft/connection.go (about)

     1  /*
     2  Copyright IBM Corp. 2016 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  		 http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package simplebft
    18  
    19  // Connection is an event from system to notify a new connection with
    20  // replica.
    21  // On connection, we send our latest (weak) checkpoint, and we expect
    22  // to receive one from replica.
    23  func (s *SBFT) Connection(replica uint64) {
    24  	batch := *s.sys.LastBatch(s.chainId)
    25  	batch.Payloads = nil // don't send the big payload
    26  	hello := &Hello{Batch: &batch}
    27  	if s.isPrimary() && s.activeView && s.lastNewViewSent != nil {
    28  		hello.NewView = s.lastNewViewSent
    29  	}
    30  	s.sys.Send(s.chainId, &Msg{&Msg_Hello{hello}}, replica)
    31  
    32  	svc := s.replicaState[s.id].signedViewchange
    33  	if svc != nil {
    34  		s.sys.Send(s.chainId, &Msg{&Msg_ViewChange{svc}}, replica)
    35  	}
    36  
    37  	// A reconnecting replica can play forward its blockchain to
    38  	// the batches listed in the hello message.  However, the
    39  	// currently in-flight batches will not be reflected in the
    40  	// Hello message, nor will all messages be present to actually
    41  	// commit the in-flight batches at the reconnecting replica.
    42  	//
    43  	// Therefore we also send the most recent (pre)prepare,
    44  	// commit, checkpoint so that the reconnecting replica can
    45  	// catch up on the in-flight batches.
    46  
    47  	batchheader, err := s.checkBatch(&batch, false, true)
    48  	if err != nil {
    49  		panic(err)
    50  	}
    51  
    52  	if s.cur.subject.Seq.Seq > batchheader.Seq && s.activeView {
    53  		if s.isPrimary() {
    54  			s.sys.Send(s.chainId, &Msg{&Msg_Preprepare{s.cur.preprep}}, replica)
    55  		} else {
    56  			s.sys.Send(s.chainId, &Msg{&Msg_Prepare{&s.cur.subject}}, replica)
    57  		}
    58  		if s.cur.prepared {
    59  			s.sys.Send(s.chainId, &Msg{&Msg_Commit{&s.cur.subject}}, replica)
    60  		}
    61  		if s.cur.committed {
    62  			s.sys.Send(s.chainId, &Msg{&Msg_Checkpoint{s.makeCheckpoint()}}, replica)
    63  		}
    64  	}
    65  }
    66  
    67  func (s *SBFT) handleHello(h *Hello, src uint64) {
    68  	bh, err := s.checkBatch(h.Batch, false, true)
    69  	log.Debugf("replica %d: got hello for batches %d from replica %d", s.id, bh.Seq, src)
    70  
    71  	if err != nil {
    72  		log.Warningf("replica %d: invalid hello batches from %d: %s", s.id, src, err)
    73  		return
    74  	}
    75  
    76  	if s.sys.LastBatch(s.chainId).DecodeHeader().Seq < bh.Seq {
    77  		log.Debugf("replica %d: delivering batches %d after hello from replica %d", s.id, bh.Seq, src)
    78  		blockOK, committers := s.getCommittersFromBatch(h.Batch)
    79  		if blockOK {
    80  			s.deliverBatch(h.Batch, committers)
    81  		} else {
    82  			log.Debugf("replica %d: we got a hello from %d with an erroneous block", s.id, src)
    83  		}
    84  	}
    85  
    86  	s.handleNewView(h.NewView, src)
    87  
    88  	s.replicaState[src].hello = h
    89  	s.discardBacklog(src)
    90  	s.processBacklog()
    91  }