Develop Hyperledger Fabric Chaincode

Smart contracts in Hyperledger Fabric are known as chaincode.

• For a conceptual overview of chaincode, see Smart Contracts and Developing Applications in the Hyperledger Fabric documentation.

• For links to Hyperledger Fabric SDKs, see Getting Started in the Hyperledger Fabric documentation.

• Hyperledger Fabric 2.x introduces decentralized governance for smart contracts. This includes a new Fabric chaincode lifecycle that enables multiple organizations in a network to come to agreement on the parameters of a chaincode. For more information, see Decentralized governance for smart contracts in the Hyperledger Fabric documentation.

Considerations and Limitations When Developing Chaincode for AMB Access

• All Hyperledger Fabric networks on AMB Access support a maximum of 8 channels per network, regardless of network edition.

• Hyperledger Fabric Shims for Node.js

  To simplify chaincode development, AMB Access includes versions of the fabric-shim library. This library provides a low-level chaincode interface between applications, peers, and the Hyperledger Fabric system for chaincode applications developed with Node.js. The library version is specified using the dependencies object in the package.json file bundled with your chaincode. You can specify a version explicitly or use the semantic versioner (semver) for NPM to specify a version range. The following library versions are available without bundling.

  • Hyperledger Fabric 1.4

    • 1.4.0

    • 1.4.1

    • 1.4.2

    • 1.4.4

    • 1.4.5

  • Hyperledger Fabric 1.2

    • 1.2.0

    • 1.2.2

    • 1.2.3

    • 1.2.4

  Dependencies on other versions of fabric-shim or other library packages require that you bundle them with your chaincode because peer nodes do not have internet access to the NPM repository.

  AMB Access doesn't currently include fabric-shim for Hyperledger Fabric 2.2. You need to bundle this version of the library in your Node.js application.

• The default limit for the size of a transaction payload is 1MB. To request a limit increase, create a case using the AWS Support Center.

• AMB Access doesn't support the External chaincode launcher in Hyperledger Fabric 2.2. This feature requires that you modify a peer's core.yaml file, which you don't currently have access to.

Topics

• Work with Private Data Collections in AMB Access Hyperledger Fabric
• Develop Hyperledger Fabric Chaincode Using Java on Amazon Managed Blockchain (AMB)