mirror of
https://github.com/hyperledger/fabric-samples.git
synced 2026-06-17 07:25:10 +00:00
Add Go smart contract implementation for full-stack-asset-transfer-guide
This commit is contained in:
vishal
parent
a2c40e6522
commit
e860de9f6f
6 changed files with 488 additions and 1 deletions
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@ -0,0 +1,11 @@
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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---
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smart_contract_name: "asset-transfer"
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smart_contract_version: "1.0.0"
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smart_contract_sequence: 1
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smart_contract_package: "asset-transfer.tgz"
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# smart_contract_constructor: "initLedger"
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smart_contract_endorsement_policy: ""
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smart_contract_collections_file: ""
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@ -0,0 +1,363 @@
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package main
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import (
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"encoding/json"
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"fmt"
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"github.com/hyperledger/fabric-chaincode-go/v2/pkg/statebased"
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"github.com/hyperledger/fabric-contract-api-go/v2/contractapi"
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)
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type SmartContract struct {
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contractapi.Contract
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}
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type Asset struct {
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AppraisedValue int `json:"AppraisedValue"`
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Color string `json:"Color"`
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ID string `json:"ID"`
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Owner string `json:"Owner"`
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Size int `json:"Size"`
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}
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type OwnerIdentifier struct {
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Org string `json:"org"`
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User string `json:"user"`
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}
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type AssetCreateInput struct {
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ID string `json:"ID"`
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Color string `json:"Color,omitempty"`
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Owner *string `json:"Owner,omitempty"`
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AppraisedValue *int `json:"AppraisedValue,omitempty"`
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Size *int `json:"Size,omitempty"`
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}
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type AssetUpdateInput struct {
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ID string `json:"ID"`
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Color *string `json:"Color,omitempty"`
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AppraisedValue *int `json:"AppraisedValue,omitempty"`
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Size *int `json:"Size,omitempty"`
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Owner *string `json:"Owner,omitempty"`
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}
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func (s *SmartContract) CreateAsset(ctx contractapi.TransactionContextInterface, assetJSON string) error {
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input, err := parseCreateInput(assetJSON)
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if err != nil {
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return err
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}
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exists, err := s.AssetExists(ctx, input.ID)
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if err != nil {
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return err
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}
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if exists {
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return fmt.Errorf("the asset %s already exists", input.ID)
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}
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owner, err := clientIdentifier(ctx, input.Owner)
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if err != nil {
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return err
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}
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asset := Asset{
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ID: input.ID,
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Color: input.Color,
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Size: valueOrDefault(input.Size, 0),
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Owner: marshalOwner(owner),
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AppraisedValue: valueOrDefault(input.AppraisedValue, 0),
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}
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assetBytes, err := json.Marshal(asset)
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if err != nil {
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return err
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}
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if err := ctx.GetStub().PutState(asset.ID, assetBytes); err != nil {
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return fmt.Errorf("failed to put asset in world state: %w", err)
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}
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if err := setEndorsingOrgs(ctx, asset.ID, owner.Org); err != nil {
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return err
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}
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return ctx.GetStub().SetEvent("CreateAsset", assetBytes)
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}
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func (s *SmartContract) ReadAsset(ctx contractapi.TransactionContextInterface, id string) (*Asset, error) {
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asset, err := s.readAsset(ctx, id)
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if err != nil {
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return nil, err
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}
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return asset, nil
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}
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func (s *SmartContract) UpdateAsset(ctx contractapi.TransactionContextInterface, assetJSON string) error {
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input, err := parseUpdateInput(assetJSON)
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if err != nil {
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return err
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}
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existingAsset, err := s.readAsset(ctx, input.ID)
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if err != nil {
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return err
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}
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if err := hasWritePermission(ctx, existingAsset); err != nil {
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return err
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}
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updatedAsset := *existingAsset
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if input.Color != nil {
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updatedAsset.Color = *input.Color
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}
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if input.Size != nil {
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updatedAsset.Size = *input.Size
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}
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if input.AppraisedValue != nil {
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updatedAsset.AppraisedValue = *input.AppraisedValue
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}
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// Owner cannot be updated via UpdateAsset. TransferAsset must be used for ownership changes.
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assetBytes, err := json.Marshal(updatedAsset)
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if err != nil {
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return err
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}
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if err := ctx.GetStub().PutState(updatedAsset.ID, assetBytes); err != nil {
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return fmt.Errorf("failed to put updated asset in world state: %w", err)
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}
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clientOrg, err := getClientOrg(ctx)
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if err != nil {
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return err
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}
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if err := setEndorsingOrgs(ctx, updatedAsset.ID, clientOrg); err != nil {
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return err
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}
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if err := ctx.GetStub().SetEvent("UpdateAsset", assetBytes); err != nil {
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return err
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}
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return nil
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}
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func (s *SmartContract) DeleteAsset(ctx contractapi.TransactionContextInterface, id string) error {
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asset, err := s.readAsset(ctx, id)
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if err != nil {
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return err
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}
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if err := hasWritePermission(ctx, asset); err != nil {
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return err
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}
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if err := ctx.GetStub().DelState(id); err != nil {
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return fmt.Errorf("failed to delete asset %s: %w", id, err)
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}
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return ctx.GetStub().SetEvent("DeleteAsset", []byte(id))
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}
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func (s *SmartContract) AssetExists(ctx contractapi.TransactionContextInterface, id string) (bool, error) {
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assetBytes, err := ctx.GetStub().GetState(id)
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if err != nil {
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return false, fmt.Errorf("failed to read world state: %w", err)
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}
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return len(assetBytes) > 0, nil
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}
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func (s *SmartContract) TransferAsset(ctx contractapi.TransactionContextInterface, id string, newOwner string, newOwnerOrg string) error {
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asset, err := s.readAsset(ctx, id)
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if err != nil {
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return err
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}
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if err := hasWritePermission(ctx, asset); err != nil {
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return err
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}
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owner := ownerIdentifier(newOwner, newOwnerOrg)
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ownerJSON, err := json.Marshal(owner)
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if err != nil {
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return err
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}
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asset.Owner = string(ownerJSON)
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assetBytes, err := json.Marshal(asset)
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if err != nil {
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return err
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}
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if err := ctx.GetStub().PutState(id, assetBytes); err != nil {
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return fmt.Errorf("failed to update asset owner in world state: %w", err)
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}
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if err := setEndorsingOrgs(ctx, id, newOwnerOrg); err != nil {
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return err
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}
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return ctx.GetStub().SetEvent("TransferAsset", assetBytes)
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}
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func (s *SmartContract) GetAllAssets(ctx contractapi.TransactionContextInterface) ([]Asset, error) {
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resultsIterator, err := ctx.GetStub().GetStateByRange("", "")
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if err != nil {
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return nil, err
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}
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defer resultsIterator.Close()
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var assets []Asset
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for resultsIterator.HasNext() {
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queryResponse, err := resultsIterator.Next()
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if err != nil {
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return nil, err
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}
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var asset Asset
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if err := json.Unmarshal(queryResponse.Value, &asset); err != nil {
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continue
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}
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assets = append(assets, asset)
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}
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return assets, nil
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}
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func (s *SmartContract) readAsset(ctx contractapi.TransactionContextInterface, id string) (*Asset, error) {
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assetBytes, err := ctx.GetStub().GetState(id)
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if err != nil {
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return nil, fmt.Errorf("failed to read world state: %w", err)
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}
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if assetBytes == nil || len(assetBytes) == 0 {
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return nil, fmt.Errorf("sorry, asset %s has not been created", id)
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}
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var asset Asset
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if err := json.Unmarshal(assetBytes, &asset); err != nil {
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return nil, fmt.Errorf("failed to unmarshal asset %s: %w", id, err)
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}
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return &asset, nil
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}
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func parseCreateInput(assetJSON string) (*AssetCreateInput, error) {
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var input AssetCreateInput
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if err := json.Unmarshal([]byte(assetJSON), &input); err != nil {
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return nil, fmt.Errorf("failed to parse asset JSON: %w", err)
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}
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if input.ID == "" {
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return nil, fmt.Errorf("missing ID")
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}
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return &input, nil
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}
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func parseUpdateInput(assetJSON string) (*AssetUpdateInput, error) {
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var input AssetUpdateInput
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if err := json.Unmarshal([]byte(assetJSON), &input); err != nil {
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return nil, fmt.Errorf("failed to parse asset JSON: %w", err)
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}
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if input.ID == "" {
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return nil, fmt.Errorf("no asset ID specified")
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}
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return &input, nil
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}
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func valueOrDefault(value *int, def int) int {
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if value == nil {
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return def
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}
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return *value
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}
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func hasWritePermission(ctx contractapi.TransactionContextInterface, asset *Asset) error {
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clientOrg, err := getClientOrg(ctx)
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if err != nil {
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return err
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}
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var owner OwnerIdentifier
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if err := json.Unmarshal([]byte(asset.Owner), &owner); err != nil {
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return fmt.Errorf("invalid owner identity: %w", err)
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}
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if clientOrg != owner.Org {
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return fmt.Errorf("only owner can update assets")
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}
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return nil
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}
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func getClientOrg(ctx contractapi.TransactionContextInterface) (string, error) {
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return ctx.GetClientIdentity().GetMSPID()
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}
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func clientIdentifier(ctx contractapi.TransactionContextInterface, user *string) (OwnerIdentifier, error) {
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clientOrg, err := getClientOrg(ctx)
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if err != nil {
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return OwnerIdentifier{}, err
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}
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userName := ""
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if user != nil {
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userName = *user
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} else {
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userName, err = clientCommonName(ctx)
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if err != nil {
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return OwnerIdentifier{}, err
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}
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}
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return OwnerIdentifier{
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Org: clientOrg,
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User: userName,
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}, nil
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}
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func clientCommonName(ctx contractapi.TransactionContextInterface) (string, error) {
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cert, err := ctx.GetClientIdentity().GetX509Certificate()
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if err != nil {
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return "", fmt.Errorf("unable to get client certificate: %w", err)
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}
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if cert.Subject.CommonName == "" {
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return "", fmt.Errorf("unable to identify client identity common name")
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}
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return cert.Subject.CommonName, nil
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}
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func marshalOwner(owner OwnerIdentifier) string {
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ownerBytes, _ := json.Marshal(owner)
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return string(ownerBytes)
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}
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func ownerIdentifier(user string, org string) OwnerIdentifier {
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return OwnerIdentifier{Org: org, User: user}
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}
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func setEndorsingOrgs(ctx contractapi.TransactionContextInterface, ledgerKey string, orgs ...string) error {
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policy, err := statebased.NewStateEP(nil)
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if err != nil {
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return err
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}
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if err = policy.AddOrgs(statebased.RoleTypePeer, orgs...); err != nil {
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return err
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}
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policyBytes, err := policy.Policy()
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if err != nil {
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return err
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}
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return ctx.GetStub().SetStateValidationParameter(ledgerKey, policyBytes)
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}
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@ -0,0 +1,28 @@
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module github.com/hyperledger/fabric-samples/full-stack-asset-transfer-guide/contracts/asset-transfer-go
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go 1.21.0
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require (
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github.com/hyperledger/fabric-chaincode-go/v2 v2.0.0
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github.com/hyperledger/fabric-contract-api-go/v2 v2.2.0
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)
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require (
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github.com/go-openapi/jsonpointer v0.21.0 // indirect
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github.com/go-openapi/jsonreference v0.21.0 // indirect
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github.com/go-openapi/spec v0.21.0 // indirect
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github.com/go-openapi/swag v0.23.0 // indirect
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github.com/hyperledger/fabric-protos-go-apiv2 v0.3.4 // indirect
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github.com/josharian/intern v1.0.0 // indirect
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github.com/mailru/easyjson v0.7.7 // indirect
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github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
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github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
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github.com/xeipuuv/gojsonschema v1.2.0 // indirect
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golang.org/x/net v0.28.0 // indirect
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golang.org/x/sys v0.24.0 // indirect
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golang.org/x/text v0.17.0 // indirect
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google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 // indirect
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google.golang.org/grpc v1.67.0 // indirect
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google.golang.org/protobuf v1.36.1 // indirect
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gopkg.in/yaml.v3 v3.0.1 // indirect
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)
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@ -0,0 +1,61 @@
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
|
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github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
|
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
|
||||
github.com/go-openapi/jsonpointer v0.21.0 h1:YgdVicSA9vH5RiHs9TZW5oyafXZFc6+2Vc1rr/O9oNQ=
|
||||
github.com/go-openapi/jsonpointer v0.21.0/go.mod h1:IUyH9l/+uyhIYQ/PXVA41Rexl+kOkAPDdXEYns6fzUY=
|
||||
github.com/go-openapi/jsonreference v0.21.0 h1:Rs+Y7hSXT83Jacb7kFyjn4ijOuVGSvOdF2+tg1TRrwQ=
|
||||
github.com/go-openapi/jsonreference v0.21.0/go.mod h1:LmZmgsrTkVg9LG4EaHeY8cBDslNPMo06cago5JNLkm4=
|
||||
github.com/go-openapi/spec v0.21.0 h1:LTVzPc3p/RzRnkQqLRndbAzjY0d0BCL72A6j3CdL9ZY=
|
||||
github.com/go-openapi/spec v0.21.0/go.mod h1:78u6VdPw81XU44qEWGhtr982gJ5BWg2c0I5XwVMotYk=
|
||||
github.com/go-openapi/swag v0.23.0 h1:vsEVJDUo2hPJ2tu0/Xc+4noaxyEffXNIs3cOULZ+GrE=
|
||||
github.com/go-openapi/swag v0.23.0/go.mod h1:esZ8ITTYEsH1V2trKHjAN8Ai7xHb8RV+YSZ577vPjgQ=
|
||||
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
|
||||
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
|
||||
github.com/hyperledger/fabric-chaincode-go/v2 v2.0.0 h1:IhkHfrl5X/fVnmB6pWeCYCdIJRi9bxj+WTnVN8DtW3c=
|
||||
github.com/hyperledger/fabric-chaincode-go/v2 v2.0.0/go.mod h1:PHHaFffjw7p7n9bmCfcm7RqDqYdivNEsJdiNIKZo5Lk=
|
||||
github.com/hyperledger/fabric-contract-api-go/v2 v2.2.0 h1:rmUoBmciB0GL/miqcbJmJbgp5QTWoJUrZo+CNxrNLF4=
|
||||
github.com/hyperledger/fabric-contract-api-go/v2 v2.2.0/go.mod h1:FeWeO/jwGjiME7ak3GufqKIcwkejtzrDG4QxbfKydWs=
|
||||
github.com/hyperledger/fabric-protos-go-apiv2 v0.3.4 h1:YJrd+gMaeY0/vsN0aS0QkEKTivGoUnSRIXxGJ7KI+Pc=
|
||||
github.com/hyperledger/fabric-protos-go-apiv2 v0.3.4/go.mod h1:bau/6AJhvEcu9GKKYHlDXAxXKzYNfhP6xu2GXuxEcFk=
|
||||
github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
|
||||
github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
|
||||
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
|
||||
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
|
||||
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
|
||||
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
|
||||
github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
|
||||
github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
|
||||
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
|
||||
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
|
||||
github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
|
||||
github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
|
||||
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
|
||||
github.com/stretchr/objx v0.5.2 h1:xuMeJ0Sdp5ZMRXx/aWO6RZxdr3beISkG5/G/aIRr3pY=
|
||||
github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
|
||||
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
|
||||
github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
|
||||
github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
|
||||
github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
|
||||
github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb h1:zGWFAtiMcyryUHoUjUJX0/lt1H2+i2Ka2n+D3DImSNo=
|
||||
github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
|
||||
github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 h1:EzJWgHovont7NscjpAxXsDA8S8BMYve8Y5+7cuRE7R0=
|
||||
github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
|
||||
github.com/xeipuuv/gojsonschema v1.2.0 h1:LhYJRs+L4fBtjZUfuSZIKGeVu0QRy8e5Xi7D17UxZ74=
|
||||
github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQluxsYJ78Id3Y=
|
||||
golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
|
||||
golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
|
||||
golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
|
||||
golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
|
||||
golang.org/x/text v0.17.0 h1:XtiM5bkSOt+ewxlOE/aE/AKEHibwj/6gvWMl9Rsh0Qc=
|
||||
golang.org/x/text v0.17.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
|
||||
google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 h1:e7S5W7MGGLaSu8j3YjdezkZ+m1/Nm0uRVRMEMGk26Xs=
|
||||
google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
|
||||
google.golang.org/grpc v1.67.0 h1:IdH9y6PF5MPSdAntIcpjQ+tXO41pcQsfZV2RxtQgVcw=
|
||||
google.golang.org/grpc v1.67.0/go.mod h1:1gLDyUQU7CTLJI90u3nXZ9ekeghjeM7pTDZlqFNg2AA=
|
||||
google.golang.org/protobuf v1.36.1 h1:yBPeRvTftaleIgM3PZ/WBIZ7XM/eEYAaEyCwvyjq/gk=
|
||||
google.golang.org/protobuf v1.36.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
|
||||
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
||||
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
|
||||
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
|
||||
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
|
||||
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
|
||||
|
|
@ -0,0 +1,18 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"log"
|
||||
|
||||
"github.com/hyperledger/fabric-contract-api-go/v2/contractapi"
|
||||
)
|
||||
|
||||
func main() {
|
||||
chaincode, err := contractapi.NewChaincode(&SmartContract{})
|
||||
if err != nil {
|
||||
log.Panicf("Error creating asset-transfer-go chaincode: %v", err)
|
||||
}
|
||||
|
||||
if err := chaincode.Start(); err != nil {
|
||||
log.Panicf("Error starting asset-transfer-go chaincode: %v", err)
|
||||
}
|
||||
}
|
||||
|
|
@ -1,13 +1,19 @@
|
|||
{
|
||||
"$schema": "https://json.schemastore.org/tsconfig",
|
||||
"extends": "@tsconfig/node20/tsconfig.json",
|
||||
"compilerOptions": {
|
||||
"target": "ES2023",
|
||||
"module": "es2022",
|
||||
"moduleResolution": "bundler",
|
||||
"lib": ["ES2023"],
|
||||
"resolveJsonModule": true,
|
||||
"allowSyntheticDefaultImports": true,
|
||||
"experimentalDecorators": true,
|
||||
"emitDecoratorMetadata": true,
|
||||
"declaration": true,
|
||||
"declarationMap": true,
|
||||
"sourceMap": true,
|
||||
"outDir": "dist",
|
||||
"rootDir": "src",
|
||||
"strict": true,
|
||||
"noUnusedLocals": true,
|
||||
"noImplicitReturns": true,
|
||||
|
|
|
|||
Loading…
Reference in a new issue