Development Preparation

Updated on 2023-03-07 GMT+08:00

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A chaincode, also called a smart contract, is a program written in Go or Node.js for operating the ledger. It is a code logic that runs on a blockchain and is automatically executed under specific conditions. Chaincodes are an important method for users to implement service logic when using blockchains. Due to the blockchain features, the execution results of smart contracts are reliable and cannot be forged or tampered with.

To use BCS, you must develop your own chaincodes and applications. Applications invoke chaincodes through peers in the blockchain network, and the chaincodes operate ledger data through peers.

Preparing the Development Environment

Install the Go development environment. Download the installation package from https://golang.org/dl/. (Select a version later than 1.9.2.)

The package name for each OS is as follows (version 1.11.12 is used as an example):

OS	Package
Windows	go1.11.12.windows-amd64.msi
Linux	go1.11.12.linux-amd64.tar.gz

In Windows, you can use the .msi installation package for installation. By default, the .msi file is installed in C:\Go. You can add the C:\Go\bin directory to the Path environment variable. Restart the CLI for the settings to take effect.
In Linux, decompress the downloaded binary package to the /usr/local directory. Add the /usr/local/go/bin directory to the Path environment variable.
```
export PATH=$PATH:/usr/local/go/bin
```

After Golang is installed, you can run the go version command to view the version information and run the go env command to view the path configuration.

Install a Go editor of your choice. GoLand is recommended.

Downloading the Source Code Package

Download the Fabric source code package as the third-party repository.

Download the required version from the following addresses:

https://github.com/hyperledger/fabric/tree/release-2.2

NOTE:

The version of the Fabric package should match that of the blockchain. For example, if a blockchain is v4.x.x, it uses Fabric v2.2, so you need to download the Fabric v2.2 package.

Parent topic: Chaincode Development

Previous topic: Chaincode Development

Next topic: Development Specifications

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