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2.0.0-rc.23 • Public • Published


Distributed application groundwork developed at Hack.bg. Fadroma is a scriptable orchestrator for building next-generation dApps on CosmWasm-enabled backends.

Component Package Description
@hackbg/fadroma View docs. Cross-chain connector and deployer.
@fadroma/agent View docs. Core API model.
@fadroma/scrt View docs. Secret Network support.
@fadroma/cw View docs. Other CosmWasm chain support.
@fadroma/create View docs. Project setup utility.
@fadroma/compile View docs. Smart contact compilation helper.
@fadroma/devnet View docs. Local instances of chains for integration testing.
@fadroma/schema View docs. Local instances of chains for integration testing.
fadroma-dsl Latest version Documentation Macro-based smart contract DSL.
fadroma Latest version Documentation Library for smart contracts.

Getting started

Creating a project

# Create a project:
$ npx @hackbg/fadroma@latest create

# Create a project using a specific version of Fadroma:
$ npx @hackbg/fadroma@2.0.0 create

The newly created project will contain the following modules:

  • api.ts is the root module of your project's TypeScript SDK. It contains Client subclasses that correspond to your contracts, and a Deployment subclass which describes how the contracts relate to each other. See the Fadroma Agent API documentation for details.

  • config.ts is your project's deploy configuration. Here, you can customize the build/upload/deploy procedures and define project-specific commands that you can then access from the Fadroma CLI.

  • test.ts is where you can write integration tests for your project.

Building contracts

# Build all contracts in the project:
$ npm run fadroma build

# Build a single contract:
$ npm run fadroma build some-contract

# Build multiple contracts:
$ npm run fadroma build some-contract another-contract a-third-contract

# Build contract by path:
$ npm run fadroma /path/to/crate

By default, builds happen in a Docker container. Set FADROMA_BUILD_RAW=1 to instead use your local Rust toolchain.

The production builds of your contracts are stored as .wasm binaries in your project's wasm/ directory. Every binary has a corresponding .wasm.sha256 checksum file whose contents correspond to the on-chain code hash.

To rebuild a contract, do one of the following:

  • delete the contract and its checksum from wasm/;
  • use the rebuild command instead of build;
  • set the FADROMA_REBUILD=1 when calling build, upload or deploy.
# Rebuild all contracts:
$ npm run fadroma rebuild

Selecting deploy targets

The supported deploy targets are mainnet, testnet, and devnet. Projects created by Fadroma define NPM scripts to select them:

# Deploy to mainnet
$ npm run mainnet deploy

# Deploy to testnet
$ npm run testnet deploy

# Deploy to devnet
$ npm run devnet deploy

In the examples below, we will use those interchangeably.

Alternatively, use the FADROMA_CHAIN environment variable with npm run fadroma. See Fadroma Connect for a list of supported values.

Using the local devnet

Fadroma allows you to easily run local instances of the supported chains, in order to test your contracts without uploading them to testnet.

# Pause the devnet
$ npm run devnet pause

# Export a snapshot of the devnet to a new Docker image
$ npm run devnet export

# Resume the devnet
$ npm run devnet resume

# Stop the devnet and erase all state
$ npm run devnet reset

An exported devnet snapshot is a great way to provide a standardized dev build of your project that can be run locally by frontend devs, by your CI pipeline, etc.

Uploading contracts

# Build and upload all contracts in the project
$ npm testnet upload

# Build and upload a single contract
$ npm testnet upload some-contract

# Build and upload multiple contracts
$ npm testnet upload some-contract another-contract a-third-contract

If contract binaries are not present, the upload command will try to build them first.

Uploading a contract adds an upload receipt in state/$CHAIN_ID/uploads/$CODE_ID.json. This prevents duplicate uploads.

To force a reupload, either use the reupload command (in place of upload), or set FADROMA_REUPLOAD=1 (e.g. when invoking upload or deploy).

# Reupload all contracts, getting new code ids:
$ npm testnet reupload

# Redeploy with new code ids
$ FADROMA_REUPLOAD=1 npm testnet redeploy

Deploying your project

Use the deploy command to deploy your project:

# Deploy your project to testnet
$ npm run testnet deploy [...ARGS]

When deploying, Fadroma will automatically build and upload any contracts that are specified in the deployment and are not already built or uploaded to the given chain.

Running deploy on a completed deployment will do nothing (unless you've updated the description of the deployment, in which case it will try to apply the updates). To deploy everything anew, use redeploy:

# Deploy everything anew
$ npm run testnet redeploy [...ARGS]

If deploying fails, you should be able to re-run deploy and continue where you left off.

Managing deployments

Deploying a project results in a deploy receipt being created - a simple file containing the state of the deployment. You can have more than one of these, corresponding to multiple independent deployments of the same code. To see a list of them, use the list command:

# List deployments in this project
$ npm run testnet list

After a deploy, the newly created deployment will be marked as active. To switch to another deployment, use the select command:

# Select another deployment
$ npm run testnet select my-deployment

Deployments in YAML multi-document format are human-readable and version control-friendly. When a list of contracts in JSON is desired, you can use the export command to export a JSON snapshot of the active deployment.

# Export the state of the active testnet deployment to ./my-deployment_@_timestamp.json
$ npm run testnet export

# Export state to ./some-directory/my-deployment_@_timestamp.json
$ npm run testnet export ./some-directory

Connecting to a deployment

In a standard Fadroma project, where the Rust contracts and TypeScript API client live in the same repo, by exporting the latest mainnet and testnet deployments to JSON files during the TypeScript build process, and adding them to your API client package, you can publish an up-to-date "address book" of your project's active contracts as part of your API client library.


Having been deployed once, contracts may be used continously. The Deployment's connect method loads stored data about the contracts in the deployment, populating the contained Contract instances.

With the above setup you can automatically connect to your project in mainnet or testnet mode, depending on what Agent you pass:


Or, to connect to individual contracts from the stored deployment:


Upgrading a deployment

Migrations can be implemented as static or regular methods of Deployment classes.


Further reading




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