github.com/adnan-c/fabric_e2e_couchdb@v0.6.1-preview.0.20170228180935-21ce6b23cf91/orderer/sbft/consenter.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 sbft
    18  
    19  import (
    20  	"github.com/hyperledger/fabric/orderer/multichain"
    21  	"github.com/hyperledger/fabric/orderer/sbft/backend"
    22  	"github.com/hyperledger/fabric/orderer/sbft/connection"
    23  	"github.com/hyperledger/fabric/orderer/sbft/persist"
    24  	"github.com/hyperledger/fabric/orderer/sbft/simplebft"
    25  	cb "github.com/hyperledger/fabric/protos/common"
    26  	"github.com/op/go-logging"
    27  )
    28  
    29  type consensusStack struct {
    30  	persist *persist.Persist
    31  	backend *backend.Backend
    32  }
    33  
    34  var logger = logging.MustGetLogger("orderer/main")
    35  
    36  // Consenter interface implementation for new main application
    37  type consenter struct {
    38  	config          *ConsensusConfig
    39  	consensusStack  *consensusStack
    40  	sbftStackConfig *backend.StackConfig
    41  	sbftPeers       map[string]*simplebft.SBFT
    42  }
    43  
    44  type chain struct {
    45  	chainID        string
    46  	consensusStack *consensusStack
    47  }
    48  
    49  // New creates a new consenter for the SBFT consensus scheme.
    50  // It accepts messages being delivered via Enqueue, orders them, and then uses the blockcutter to form the messages
    51  // into blocks before writing to the given ledger.
    52  func New(c *ConsensusConfig, sc *backend.StackConfig) multichain.Consenter {
    53  	return &consenter{config: c, sbftStackConfig: sc}
    54  }
    55  
    56  func (sbft *consenter) HandleChain(support multichain.ConsenterSupport, metadata *cb.Metadata) (multichain.Chain, error) {
    57  	return newChain(sbft, support), nil
    58  }
    59  
    60  func newChain(sbft *consenter, support multichain.ConsenterSupport) *chain {
    61  	logger.Infof("Starting a chain: %d", support.ChainID())
    62  
    63  	if sbft.sbftPeers == nil {
    64  		sbft.consensusStack = createConsensusStack(sbft)
    65  		sbft.sbftPeers = make(map[string]*simplebft.SBFT)
    66  	}
    67  	sbft.sbftPeers[support.ChainID()] = initSbftPeer(support.ChainID(), sbft, support)
    68  
    69  	return &chain{
    70  		chainID:        support.ChainID(),
    71  		consensusStack: sbft.consensusStack,
    72  	}
    73  }
    74  
    75  func createConsensusStack(sbft *consenter) *consensusStack {
    76  	logger.Infof("%v    %v      %v", sbft.sbftStackConfig.ListenAddr, sbft.sbftStackConfig.CertFile, sbft.sbftStackConfig.KeyFile)
    77  	conn, err := connection.New(sbft.sbftStackConfig.ListenAddr, sbft.sbftStackConfig.CertFile, sbft.sbftStackConfig.KeyFile)
    78  	if err != nil {
    79  		logger.Errorf("Error when trying to connect: %s", err)
    80  		panic(err)
    81  	}
    82  	persist := persist.New(sbft.sbftStackConfig.DataDir)
    83  	backend, err := backend.NewBackend(sbft.config.Peers, conn, persist)
    84  	if err != nil {
    85  		logger.Errorf("Backend instantiation error.")
    86  		panic(err)
    87  	}
    88  	return &consensusStack{
    89  		backend: backend,
    90  		persist: persist,
    91  	}
    92  }
    93  
    94  func initSbftPeer(chainID string, sbft *consenter, support multichain.ConsenterSupport) *simplebft.SBFT {
    95  	sbftPeer, err := sbft.consensusStack.backend.AddSbftPeer(support.ChainID(), support, sbft.config.Consensus)
    96  	if err != nil {
    97  		logger.Errorf("SBFT peer instantiation error.")
    98  		panic(err)
    99  	}
   100  	return sbftPeer
   101  }
   102  
   103  // Chain interface implementation:
   104  
   105  // Start allocates the necessary resources for staying up to date with this Chain.
   106  // It implements the multichain.Chain interface. It is called by multichain.NewManagerImpl()
   107  // which is invoked when the ordering process is launched, before the call to NewServer().
   108  func (ch *chain) Start() {
   109  
   110  }
   111  
   112  // Halt frees the resources which were allocated for this Chain
   113  func (ch *chain) Halt() {
   114  	panic("There is no way to halt SBFT")
   115  }
   116  
   117  // Enqueue accepts a message and returns true on acceptance, or false on shutdown
   118  func (ch *chain) Enqueue(env *cb.Envelope) bool {
   119  	return ch.consensusStack.backend.Enqueue(ch.chainID, env)
   120  }