Contributing to Hyperledger Caliper

Welcome to Hyperledger Caliper project, we are excited about the prospect of you contributing.

How to contribute

We are using GitHub issues for bug reports and feature requests.

If you find any bug in the source code or have any trivial changes (such as typos fix, minor feature), you can raise an issue or delivery a fix via a pull request directly.

If you have any enhancement suggestions or want to help extend caliper with more DLTs or have any other major changes, please start by opening an issue first. That way, relevant parties (e.g. maintainers or main contributors of the relevant subsystem) can have a chance to look at it before you do any work.

All PRs must get at least one review, you can ask hyperledger/caliper-committers for review. Normally we will review your contribution in one week. If you haven’t heard from anyone in one week, feel free to @ or mail a maintainer to review it.

All PRs must be signed before be merged, be sure to use git commit -s to commit your changes.

We use Travis Ci to test the build - please test on your local branch before raising a PR. More information on Travis, and linking to your github repository may be found here:

There is also Discord with a Caliper channel for communication, anybody is welcome to join.

Caliper Structure

Caliper is modularised under packages into the following components:


This contains samples that may be run using the caliper-cli, and extended to include more adaptor scenarios. The package contains the following folders:

  • benchmark: contains benchmark configuration files
  • src: contains smart contracts to be tested
  • network: contains blockchain (network) configuration files


This is the Caliper CLI that enables the running of a benchmark


Contains all the Caliper core code. Interested developers can follow the code flow from the above run-benchmark.js file, that enters caliper-flow.js in the core package.


Each caliper-<adapter> is a separate package that contains a distinct adaptor implementation to interact with different blockchain technologies. Current adaptors include:

  • caliper-burrow
  • caliper-besu
  • caliper-ethereum
  • caliper-fabric
  • caliper-fisco-bcos
  • caliper-iroha
  • caliper-sawtooth

Each adaptor implements the BlockchainInterface from the core package, as well as a ClientFactory and ClientWorker that are bespoke to the adaptor.


This is the integration test suite used for caliper; it runs in the Travis build and can (should) be run locally when checking code changes. Please see the readme within the package for more details.

Creating a New Test Case

Currently the easiest way to create a new test case is to extend or add to the caliper-samples package. You have options from this point:

  • run the integration tests to get the CLI module installed, then use the command line comand caliper benchmark run --caliper-workspace <path>/caliper-samples --caliper-benchconfig benchmark/my-config.yaml --caliper-networkconfig network/my-network.yaml
  • directly run node ./packages/caliper-cli/caliper.js benchmark run --caliper-benchconfig benchmark/my-config.yaml --caliper-networkconfig network/my-network.yaml --caliper-workspace ./packages/caliper-samples from the root folder

Before adding a benchmark, please inspect the caliper-samples structure and example benchmarks; you will need to add your own configuration files for the blockchain system under test, the benchmark configuration, smart contracts, and test files (callbacks) that interact with the deployed smart contract. You can then run the benchmark using the approaches above.

Add an Adaptor for a New DLT

New adaptors must be added within a new package, under packages, with the naming convention caliper-<adaptor_name>. Each adaptor must implement a new class inherited from BlockchainInterface as the adaptor for the DLT, as well as a ClientFactory and ClientWorker. For more information, consult our main documentation.


The Caliper codebase is released under the Apache 2.0 license. Any documentation developed by the Caliper Project is licensed under the Creative Commons Attribution 4.0 International License. You may obtain a copy of the license, titled CC-BY-4.0, at