github.com/myafeier/fabric@v1.0.1-0.20170722181825-3a4b1f2bce86/orderer/common/configtxfilter/filter.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 configtxfilter
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"github.com/hyperledger/fabric/common/configtx"
    23  	"github.com/hyperledger/fabric/common/configtx/api"
    24  	"github.com/hyperledger/fabric/orderer/common/filter"
    25  	cb "github.com/hyperledger/fabric/protos/common"
    26  	"github.com/hyperledger/fabric/protos/utils"
    27  )
    28  
    29  type configFilter struct {
    30  	configManager api.Manager
    31  }
    32  
    33  // New creates a new configfilter Rule based on the given Manager
    34  func NewFilter(manager api.Manager) filter.Rule {
    35  	return &configFilter{
    36  		configManager: manager,
    37  	}
    38  }
    39  
    40  type configCommitter struct {
    41  	manager        api.Manager
    42  	configEnvelope *cb.ConfigEnvelope
    43  }
    44  
    45  func (cc *configCommitter) Commit() {
    46  	err := cc.manager.Apply(cc.configEnvelope)
    47  	if err != nil {
    48  		panic(fmt.Errorf("Could not apply config transaction which should have already been validated: %s", err))
    49  	}
    50  }
    51  
    52  func (cc *configCommitter) Isolated() bool {
    53  	return true
    54  }
    55  
    56  // Apply applies the rule to the given Envelope, replying with the Action to take for the message
    57  func (cf *configFilter) Apply(message *cb.Envelope) (filter.Action, filter.Committer) {
    58  	msgData, err := utils.UnmarshalPayload(message.Payload)
    59  	if err != nil {
    60  		return filter.Forward, nil
    61  	}
    62  
    63  	if msgData.Header == nil /* || msgData.Header.ChannelHeader == nil */ {
    64  		return filter.Forward, nil
    65  	}
    66  
    67  	chdr, err := utils.UnmarshalChannelHeader(msgData.Header.ChannelHeader)
    68  	if err != nil {
    69  		return filter.Forward, nil
    70  	}
    71  
    72  	if chdr.Type != int32(cb.HeaderType_CONFIG) {
    73  		return filter.Forward, nil
    74  	}
    75  
    76  	configEnvelope, err := configtx.UnmarshalConfigEnvelope(msgData.Data)
    77  	if err != nil {
    78  		return filter.Reject, nil
    79  	}
    80  
    81  	err = cf.configManager.Validate(configEnvelope)
    82  	if err != nil {
    83  		return filter.Reject, nil
    84  	}
    85  
    86  	return filter.Accept, &configCommitter{
    87  		manager:        cf.configManager,
    88  		configEnvelope: configEnvelope,
    89  	}
    90  }