Practical guidance of Golang language in blockchain decentralized applications

How to use Golang to develop blockchain DApp? Create a smart contract (fabric-chaincode) and interact with the blockchain network (fabric-sdk-go) Practical case: Build a supply chain management DApp to deploy smart contracts Use fabric-sdk-go to interact with the network to provide a DApp interactive interface

Practical guidance of Golang language in decentralized blockchain applications

Introduction

With With the popularity of blockchain technology, using Golang to develop decentralized applications (DApps) has become more and more popular. Golang is known for its high performance, cross-platform, and concurrency features, making it ideal for building robust and scalable applications in a blockchain environment.

Create Smart Contracts

Smart contracts are executable programs on the blockchain that allow transactions to be executed without the need for a third party. Smart contracts can be developed using Golang’s fabric-chaincode library.

import "github.com/hyperledger/fabric/core/chaincode/shim"

func main() {
    shim.Start(new(MyChaincode))
}

type MyChaincode struct {
}

func (t *MyChaincode) Init(stub shim.ChaincodeStubInterface) error {
    return nil
}

func (t *MyChaincode) Invoke(stub shim.ChaincodeStubInterface) error {
    fcn, params := stub.GetFunctionAndParameters()

    switch fcn {
    case "set":
        return t.set(stub, params)
    case "get":
        return t.get(stub, params)
    }

    return nil
}

Interacting with the blockchain network

You can use Golang’s fabric-sdk-go library to interact with the blockchain network. It provides a rich API compatible with Fabric, Hyperledger 1.4 and above.

import "github.com/hyperledger/fabric-sdk-go/pkg/client/channel"

func connect(networkID string) (*channel.Client, error) {
    client, err := channel.New(
        channel.WithUser("User1"),
        channel.WithOrg("Org1"),
        channel.WithOrderer("orderer.example.com"),
        channel.WithDiscoveryEndpoint("example.com:7051"),
        channel.WithNetworkConfig(networkID),
    )

    return client, err
}

Practical case: Building a supply chain management application

Consider a supply chain management scenario where you need to track the entire journey of goods from supplier to consumer. You can use Golang to develop a DApp that uses smart contracts to store the status of an item, supplier and consumer addresses.

Steps:

1. Deploy the smart contract.
2. Use the fabric-sdk-go library to interact with the blockchain network.
3. Use HTTP server or CLI to provide an interface for interacting with DApp.

Conclusion

By following this guide, developers can leverage the power of Golang to build robust and scalable decentralized blockchain environments application. The examples and practical cases in this guide show the practical application of developing DApps using Golang.

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