fabric-smart-client

README

Fabric Smart Client

The Fabric Smart Client (FSC, for short) is a new Fabric client-side component whose objective is twofold.

1. To simplify the development of Fabric-based distributed application by hiding the complexity of Fabric and leveraging Fabric's Hidden Gems that too often are underestimated if not ignored.
2. To allow developers and/or domain experts to focus on the business processes and not the blockchain technicalities.

Disclaimer

Fabric Smart Client has not been audited and is provided as-is, use at your own risk. The project will be subject to rapid changes to complete the list of features.

Useful Links

• Documentation: Discover the design principles of the Fabric Smart Client based on the Hidden Gems of Hyperledger Fabric.

• Feedback: Your help is the key to the success of the Fabric Smart Client.

  • Submit your issues here.
  • If you have any questions, queries or comments, find us on GitHub discussions.

• Fabric Token SDK: Do you want to develop Token-Based Distributed application with simplicity and joy? Check our Token SDK out here.

Getting started

Clone the code. Sometimes, we use $FSC_PATH to refer to the Fabric Smart Client repository in your filesystem, for example:

export FSC_PATH=$HOME/myprojects/fabric-smart-client
git clone https://github.com/hyperledger-labs/fabric-smart-client.git $FSC_PATH

Further information

Fabric Smart Client uses a system called NWO for its integration tests to programmatically create a fabric network along with the fabric-smart-client nodes. The current version of fabric that is tested can be found in the project Makefile set in the FABRIC_VERSION variable.

In order for a fabric network to be able to be created you need to ensure you have downloaded the appropriate version of the hyperledger fabric binaries from Fabric Releaes and unpack the compressed file onto your file system. This will create a directory structure of /bin and /config. You will then need to set the environment variable FAB_BINS to the bin directory. For example if you unpacked the compressed file into /home/name/fabric then you would

export FAB_BINS=/home/name/fabric/bin

Do not store the fabric binaries within your fabric-smart-client cloned repo as this will cause problems running the integration tests as they will not be able to install chaincode.

Almost all the integration tests require the fabric binaries to be downloaded and the environment variable FAB_BINS set to point to the directory where these binaries are stored. One way to ensure this is to execute the following in the root of the fabric-smart-client project

make download-fabric
export FAB_BINS=$PWD/../fabric/bin

You can also use this to download a different version of the fabric binaries for example

FABRIC_VERSION=2.5.0 make download-fabric

If you want to provide your own versions of the fabric binaries then just set FAB_BINS to the directory where all the fabric binaries are stored.

Profiling

FSC comes with built-in profiling support. See more details in profile.go.
You can enable it using the FSCNODE_PROFILER environment variable.

Example:

FSCNODE_PROFILER=true make integration-tests-iou

Getting Help

Found a bug? Need help to fix an issue? You have a great idea for a new feature? Talk to us! You can reach us on Discord in #fabric-smart-client.

Motivation

Hyperledger Fabric is a permissioned, modular, and extensible open-source DLT platform. Fabric architecture follows a novel execute-order-validate paradigm that supports distributed execution of untrusted code in an untrusted environment. Indeed, Fabric-based distributed applications can be written in any general-purpose programming language.

Developing applications for Hyperledger Fabric is often hard, sometimes painful. Fabric is a very powerful ecosystem whose building blocks must be carefully orchestrated to achieve the desired results. Currently, the Fabric Client SDKs are too limited. They do not offer any advanced capabilities to let the developers focus on the application business processes, and harness the full potential of Fabric.

What would happen if the developers could use a Smart(er) Fabric Client that offers:

• A high level API that hides the complexity of Fabric;
• A Peer-to-Peer infrastructure that let Fabric Clients and Endorsers talk to each as required by the business processes;
• Advanced transaction orchestration;
• A simplified model to interact with chaincodes;
• A State-based programming model that let you forget about RW sets and focus on business objects and their interactions?

Developing Fabric-based distributed applications would become simpler and joyful. If you are a domain expert, the Fabric Smart Client hides the complexity of Fabric and allows you to focus on the business interactions. If you are a skilled software engineer, you will be able to leverage the full power of Fabric.

But, this is not all. The Fabric Smart Client is a client-side component that can be used to develop applications:

• With TEE support as offered by Fabric Private Chaincode.
• And more...

Testing Philosophy

Write tests. Not too many. Mostly Integration

We also believe that when developing new functions running tests is preferable than running the application to verify the code is working as expected.

Versioning

We use SemVer for versioning. For the versions available, see the tags on this repository.

License

This project is licensed under the Apache 2 License - see the LICENSE file for details