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https://github.com/hyperledger/fabric-samples.git
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2e6de80c14
Add some methods to the parsing API within the Go off_chain_data sample for consistency with the Node and Java implementations: - ToProto() on Block, Transaction and NamespaceReadWriteSet. - ValidationCode() on Transaction. - Creator() on Transaction Signed-off-by: Mark S. Lewis <Mark.S.Lewis@outlook.com>
102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
package parser
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import (
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"sync"
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"github.com/hyperledger/fabric-protos-go-apiv2/common"
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"google.golang.org/protobuf/proto"
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)
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type Block struct {
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block *common.Block
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transactions func() ([]*Transaction, error)
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}
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func ParseBlock(block *common.Block) *Block {
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result := &Block{block, nil}
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result.transactions = sync.OnceValues(result.unmarshalTransactions)
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return result
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}
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func (b *Block) Number() uint64 {
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return b.block.GetHeader().GetNumber()
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}
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func (b *Block) Transactions() ([]*Transaction, error) {
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return b.transactions()
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}
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func (b *Block) ToProto() *common.Block {
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return b.block
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}
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func (b *Block) unmarshalTransactions() ([]*Transaction, error) {
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envelopes, err := b.unmarshalEnvelopes()
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if err != nil {
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return nil, err
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}
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commonPayloads, err := b.unmarshalPayloadsFrom(envelopes)
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if err != nil {
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return nil, err
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}
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payloads, err := b.parse(commonPayloads)
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if err != nil {
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return nil, err
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}
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return b.createTransactionsFrom(payloads), nil
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}
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func (b *Block) unmarshalEnvelopes() ([]*common.Envelope, error) {
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var result []*common.Envelope
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for _, blockData := range b.block.GetData().GetData() {
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envelope := &common.Envelope{}
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if err := proto.Unmarshal(blockData, envelope); err != nil {
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return nil, err
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}
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result = append(result, envelope)
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}
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return result, nil
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}
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func (*Block) unmarshalPayloadsFrom(envelopes []*common.Envelope) ([]*common.Payload, error) {
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var result []*common.Payload
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for _, envelope := range envelopes {
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commonPayload := &common.Payload{}
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if err := proto.Unmarshal(envelope.GetPayload(), commonPayload); err != nil {
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return nil, err
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}
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result = append(result, commonPayload)
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}
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return result, nil
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}
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func (b *Block) parse(commonPayloads []*common.Payload) ([]*payload, error) {
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validationCodes := b.block.GetMetadata().GetMetadata()[common.BlockMetadataIndex_TRANSACTIONS_FILTER]
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var result []*payload
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for i, commonPayload := range commonPayloads {
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statusCode := validationCodes[i]
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payload, err := parsePayload(commonPayload, int32(statusCode))
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if err != nil {
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return nil, err
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}
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if payload.isEndorserTransaction() {
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result = append(result, payload)
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}
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}
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return result, nil
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}
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func (*Block) createTransactionsFrom(payloads []*payload) []*Transaction {
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var result []*Transaction
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for _, payload := range payloads {
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result = append(result, newTransaction(payload))
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}
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return result
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}
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