github.com/kchristidis/fabric@v1.0.4-0.20171028114726-837acd08cde1/peer/channel/deliverclient.go (about)

     1  /*
     2  Copyright IBM Corp. 2017 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 channel
    18  
    19  import (
    20  	"fmt"
    21  	"time"
    22  
    23  	"github.com/hyperledger/fabric/common/localmsp"
    24  	"github.com/hyperledger/fabric/protos/common"
    25  	ab "github.com/hyperledger/fabric/protos/orderer"
    26  	"github.com/hyperledger/fabric/protos/utils"
    27  	"google.golang.org/grpc"
    28  )
    29  
    30  type deliverClientIntf interface {
    31  	getSpecifiedBlock(num uint64) (*common.Block, error)
    32  	getOldestBlock() (*common.Block, error)
    33  	getNewestBlock() (*common.Block, error)
    34  	Close() error
    35  }
    36  
    37  type deliverClient struct {
    38  	conn    *grpc.ClientConn
    39  	client  ab.AtomicBroadcast_DeliverClient
    40  	chainID string
    41  }
    42  
    43  func newDeliverClient(conn *grpc.ClientConn, client ab.AtomicBroadcast_DeliverClient, chainID string) *deliverClient {
    44  	return &deliverClient{conn: conn, client: client, chainID: chainID}
    45  }
    46  
    47  func seekHelper(chainID string, position *ab.SeekPosition) *common.Envelope {
    48  	seekInfo := &ab.SeekInfo{
    49  		Start:    position,
    50  		Stop:     position,
    51  		Behavior: ab.SeekInfo_BLOCK_UNTIL_READY,
    52  	}
    53  
    54  	//TODO- epoch and msgVersion may need to be obtained for nowfollowing usage in orderer/configupdate/configupdate.go
    55  	msgVersion := int32(0)
    56  	epoch := uint64(0)
    57  	env, err := utils.CreateSignedEnvelope(common.HeaderType_CONFIG_UPDATE, chainID, localmsp.NewSigner(), seekInfo, msgVersion, epoch)
    58  	if err != nil {
    59  		logger.Errorf("Error signing envelope:  %s", err)
    60  		return nil
    61  	}
    62  	return env
    63  }
    64  
    65  func (r *deliverClient) seekSpecified(blockNumber uint64) error {
    66  	return r.client.Send(seekHelper(r.chainID, &ab.SeekPosition{Type: &ab.SeekPosition_Specified{Specified: &ab.SeekSpecified{Number: blockNumber}}}))
    67  }
    68  
    69  func (r *deliverClient) seekOldest() error {
    70  	return r.client.Send(seekHelper(r.chainID, &ab.SeekPosition{Type: &ab.SeekPosition_Oldest{Oldest: &ab.SeekOldest{}}}))
    71  }
    72  
    73  func (r *deliverClient) seekNewest() error {
    74  	return r.client.Send(seekHelper(r.chainID, &ab.SeekPosition{Type: &ab.SeekPosition_Newest{Newest: &ab.SeekNewest{}}}))
    75  }
    76  
    77  func (r *deliverClient) readBlock() (*common.Block, error) {
    78  	msg, err := r.client.Recv()
    79  	if err != nil {
    80  		return nil, fmt.Errorf("Error receiving: %s", err)
    81  	}
    82  
    83  	switch t := msg.Type.(type) {
    84  	case *ab.DeliverResponse_Status:
    85  		logger.Debugf("Got status: %v", t)
    86  		return nil, fmt.Errorf("can't read the block: %v", t)
    87  	case *ab.DeliverResponse_Block:
    88  		logger.Debugf("Received block: %v", t.Block.Header.Number)
    89  		r.client.Recv() // Flush the success message
    90  		return t.Block, nil
    91  	default:
    92  		return nil, fmt.Errorf("response error: unknown type %T", t)
    93  	}
    94  }
    95  
    96  func (r *deliverClient) getSpecifiedBlock(num uint64) (*common.Block, error) {
    97  	err := r.seekSpecified(num)
    98  	if err != nil {
    99  		logger.Errorf("Received error: %s", err)
   100  		return nil, err
   101  	}
   102  
   103  	return r.readBlock()
   104  }
   105  
   106  func (r *deliverClient) getOldestBlock() (*common.Block, error) {
   107  	err := r.seekOldest()
   108  	if err != nil {
   109  		return nil, fmt.Errorf("Received error: %s ", err)
   110  	}
   111  
   112  	return r.readBlock()
   113  }
   114  
   115  func (r *deliverClient) getNewestBlock() (*common.Block, error) {
   116  	err := r.seekNewest()
   117  	if err != nil {
   118  		logger.Errorf("Received error: %s", err)
   119  		return nil, err
   120  	}
   121  
   122  	return r.readBlock()
   123  }
   124  
   125  func (r *deliverClient) Close() error {
   126  	return r.conn.Close()
   127  }
   128  
   129  func getGenesisBlock(cf *ChannelCmdFactory) (*common.Block, error) {
   130  	timer := time.NewTimer(time.Second * time.Duration(timeout))
   131  	defer timer.Stop()
   132  
   133  	for {
   134  		select {
   135  		case <-timer.C:
   136  			cf.DeliverClient.Close()
   137  			return nil, fmt.Errorf("timeout waiting for channel creation")
   138  		default:
   139  			if block, err := cf.DeliverClient.getSpecifiedBlock(0); err != nil {
   140  				cf.DeliverClient.Close()
   141  				cf, err = InitCmdFactory(EndorserNotRequired, OrdererRequired)
   142  				if err != nil {
   143  					return nil, fmt.Errorf("failed connecting: %v", err)
   144  				}
   145  				time.Sleep(200 * time.Millisecond)
   146  			} else {
   147  				cf.DeliverClient.Close()
   148  				return block, nil
   149  			}
   150  		}
   151  	}
   152  }