github.com/myafeier/fabric@v1.0.1-0.20170722181825-3a4b1f2bce86/core/deliverservice/mocks/orderer.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 mocks
    18  
    19  import (
    20  	"fmt"
    21  	"net"
    22  	"sync/atomic"
    23  	"testing"
    24  
    25  	"github.com/golang/protobuf/proto"
    26  	"github.com/hyperledger/fabric/protos/common"
    27  	"github.com/hyperledger/fabric/protos/orderer"
    28  	"github.com/stretchr/testify/assert"
    29  	"google.golang.org/grpc"
    30  )
    31  
    32  type Orderer struct {
    33  	net.Listener
    34  	*grpc.Server
    35  	nextExpectedSeek uint64
    36  	t                *testing.T
    37  	blockChannel     chan uint64
    38  	stopChan         chan struct{}
    39  	failFlag         int32
    40  	connCount        uint32
    41  }
    42  
    43  func NewOrderer(port int, t *testing.T) *Orderer {
    44  	srv := grpc.NewServer()
    45  	lsnr, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", port))
    46  	if err != nil {
    47  		panic(err)
    48  	}
    49  	go srv.Serve(lsnr)
    50  	o := &Orderer{Server: srv,
    51  		Listener:         lsnr,
    52  		t:                t,
    53  		nextExpectedSeek: uint64(1),
    54  		blockChannel:     make(chan uint64, 1),
    55  		stopChan:         make(chan struct{}, 1),
    56  	}
    57  	orderer.RegisterAtomicBroadcastServer(srv, o)
    58  	return o
    59  }
    60  
    61  func (o *Orderer) Shutdown() {
    62  	o.stopChan <- struct{}{}
    63  	o.Server.Stop()
    64  	o.Listener.Close()
    65  }
    66  
    67  func (o *Orderer) Fail() {
    68  	atomic.StoreInt32(&o.failFlag, int32(1))
    69  	o.blockChannel <- 0
    70  }
    71  
    72  func (o *Orderer) ConnCount() int {
    73  	return int(atomic.LoadUint32(&o.connCount))
    74  }
    75  
    76  func (o *Orderer) hasFailed() bool {
    77  	return atomic.LoadInt32(&o.failFlag) == int32(1)
    78  }
    79  
    80  func (*Orderer) Broadcast(orderer.AtomicBroadcast_BroadcastServer) error {
    81  	panic("Should not have ben called")
    82  }
    83  
    84  func (o *Orderer) SetNextExpectedSeek(seq uint64) {
    85  	atomic.StoreUint64(&o.nextExpectedSeek, uint64(seq))
    86  }
    87  
    88  func (o *Orderer) SendBlock(seq uint64) {
    89  	o.blockChannel <- seq
    90  }
    91  
    92  func (o *Orderer) Deliver(stream orderer.AtomicBroadcast_DeliverServer) error {
    93  	atomic.AddUint32(&o.connCount, 1)
    94  	envlp, err := stream.Recv()
    95  	if err != nil {
    96  		return nil
    97  	}
    98  	if o.hasFailed() {
    99  		return stream.Send(statusUnavailable())
   100  	}
   101  	payload := &common.Payload{}
   102  	proto.Unmarshal(envlp.Payload, payload)
   103  	seekInfo := &orderer.SeekInfo{}
   104  	proto.Unmarshal(payload.Data, seekInfo)
   105  	assert.True(o.t, seekInfo.Behavior == orderer.SeekInfo_BLOCK_UNTIL_READY)
   106  	assert.Equal(o.t, atomic.LoadUint64(&o.nextExpectedSeek), seekInfo.Start.GetSpecified().Number)
   107  
   108  	for {
   109  		select {
   110  		case <-o.stopChan:
   111  			return nil
   112  		case seq := <-o.blockChannel:
   113  			if o.hasFailed() {
   114  				return stream.Send(statusUnavailable())
   115  			}
   116  			o.sendBlock(stream, seq)
   117  		}
   118  	}
   119  }
   120  
   121  func statusUnavailable() *orderer.DeliverResponse {
   122  	return &orderer.DeliverResponse{
   123  		Type: &orderer.DeliverResponse_Status{
   124  			Status: common.Status_SERVICE_UNAVAILABLE,
   125  		},
   126  	}
   127  }
   128  
   129  func (o *Orderer) sendBlock(stream orderer.AtomicBroadcast_DeliverServer, seq uint64) {
   130  	block := &common.Block{
   131  		Header: &common.BlockHeader{
   132  			Number: seq,
   133  		},
   134  	}
   135  	stream.Send(&orderer.DeliverResponse{
   136  		Type: &orderer.DeliverResponse_Block{Block: block},
   137  	})
   138  }