github.com/kchristidis/fabric@v1.0.4-0.20171028114726-837acd08cde1/protos/common/common.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 common
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"github.com/golang/protobuf/proto"
    23  )
    24  
    25  func (e *Envelope) StaticallyOpaqueFields() []string {
    26  	return []string{"payload"}
    27  }
    28  
    29  func (e *Envelope) StaticallyOpaqueFieldProto(name string) (proto.Message, error) {
    30  	if name != e.StaticallyOpaqueFields()[0] {
    31  		return nil, fmt.Errorf("not a marshaled field: %s", name)
    32  	}
    33  	return &Payload{}, nil
    34  }
    35  
    36  func (p *Payload) VariablyOpaqueFields() []string {
    37  	return []string{"data"}
    38  }
    39  
    40  func (p *Payload) VariablyOpaqueFieldProto(name string) (proto.Message, error) {
    41  	if name != p.VariablyOpaqueFields()[0] {
    42  		return nil, fmt.Errorf("not a marshaled field: %s", name)
    43  	}
    44  	if p.Header == nil {
    45  		return nil, fmt.Errorf("cannot determine payload type when header is missing")
    46  	}
    47  	ch := &ChannelHeader{}
    48  	if err := proto.Unmarshal(p.Header.ChannelHeader, ch); err != nil {
    49  		return nil, fmt.Errorf("corrupt channel header: %s", err)
    50  	}
    51  
    52  	switch ch.Type {
    53  	case int32(HeaderType_CONFIG):
    54  		return &ConfigEnvelope{}, nil
    55  	case int32(HeaderType_CONFIG_UPDATE):
    56  		return &ConfigUpdateEnvelope{}, nil
    57  	// TODO implement the other well known types, particularly endorser txs
    58  	default:
    59  		return nil, fmt.Errorf("decoding type %v is unimplemented", ch.Type)
    60  	}
    61  }
    62  
    63  func (h *Header) StaticallyOpaqueFields() []string {
    64  	return []string{"channel_header", "signature_header"}
    65  }
    66  
    67  func (h *Header) StaticallyOpaqueFieldProto(name string) (proto.Message, error) {
    68  	switch name {
    69  	case h.StaticallyOpaqueFields()[0]: // channel_header
    70  		return &ChannelHeader{}, nil
    71  	case h.StaticallyOpaqueFields()[1]: // signature_header
    72  		return &SignatureHeader{}, nil
    73  	default:
    74  		return nil, fmt.Errorf("unknown header field: %s", name)
    75  	}
    76  }
    77  
    78  func (bd *BlockData) StaticallyOpaqueSliceFields() []string {
    79  	return []string{"data"}
    80  }
    81  
    82  func (bd *BlockData) StaticallyOpaqueSliceFieldProto(fieldName string, index int) (proto.Message, error) {
    83  	if fieldName != bd.StaticallyOpaqueSliceFields()[0] {
    84  		return nil, fmt.Errorf("not an opaque slice field: %s", fieldName)
    85  	}
    86  
    87  	return &Envelope{}, nil
    88  }