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Official golang implementation of the Celo blockchain, based off of the official golang implementation of the Ethereum protocol.

Prebuilt Docker images are available for immediate use: us.gcr.io/celo-testnet/celo-node. See docs.celo.org/getting-started for a guide to the Celo networks and how to get started.

Documentation for Celo more generally can be found at docs.celo.org

Most functionality of this client is similar to go-ethereum, also known as geth, from which it was forked. If you do not find your question answered by Celo-specific documentation, try searching the geth wiki.

Building geth requires both a Go (version 1.13) and a C compiler. You can install them using your favourite package manager. Once the dependencies are installed, run

make geth

or, to build the full suite of utilities:

make all

The Celo blockchain client comes with several wrappers/executables found in the cmd directory.

Please see the docs.celo.org/getting-started for instructions on how to run a node connected the Celo network using the prebuilt Docker image.

Going through all the possible command line flags is out of scope here, please consult geth --help for more complete information. We've enumerated a few common parameter combos to get you up to speed quickly on how you can run your own Celo blockchain client instance.

By default, the Celo client will connect to the Mainnet. Running the following command will create a full node that will sync with the Celo network and allow access to all of its functionality.

$ geth --syncmode full console

This command will:

• Start geth in full sync mode which will download and execute all historical block information.
• Start up geth's built-in interactive JavaScript console, (via the trailing console subcommand) through which you can invoke all official web3 methods as well as geth's own management APIs. This tool is optional and if you leave it out you can always attach to an already running geth instance with geth attach.

Smart contract developers will be most interested in the Alfajores testnet. On Alfajores, you can receive testnet Celo Gold through the Alfajores faucet and deploy smart contracts in an environment very simmialr to Mainnet. More information about the Alfajores testnet can be found on docs.celo.org.

$ geth --alfajores --syncmode full console

Note: Although there are some internal protective measures to prevent transactions from crossing over between the main network and test network, you should make sure to always use separate accounts for testnet-tokens and real-tokens. Unless you manually move accounts, geth will by default correctly separate the two networks and will not make any accounts available between them.

Validators and full node operators will be most interested in the Baklava testnet. On Baklava, you can receive a distribution of testnet Celo Gold to become a validator on the network and test out running a validator for the first time, or try out new infrastructure. More information about the Baklava testnet can be found on docs.celo.org. A full guide to getting started as a validator on Baklava can be found in the Getting Started guides

$ geth --baklava --syncmode full console

As an alternative to passing the numerous flags to the Celo binary, you can also pass a configuration file via:

$ geth --config /path/to/your_config.toml

To get an idea how the file should look like you can use the dumpconfig subcommand to export your existing configuration:

$ geth --your-favourite-flags dumpconfig

As a developer, sooner rather than later you'll want to start interacting with geth and the Celo network via your own programs and not manually through the console. To aid this, geth has built-in support for a JSON-RPC based APIs (standard APIs and geth specific APIs). These can be exposed via HTTP, WebSockets and IPC (UNIX sockets on UNIX based platforms, and named pipes on Windows).

The IPC interface is enabled by default and exposes all the APIs supported by geth, whereas the HTTP and WS interfaces need to manually be enabled and only expose a subset of APIs due to security reasons. These can be turned on/off and configured as you'd expect.

HTTP based JSON-RPC API options:

• --rpc Enable the HTTP-RPC server
• --rpcaddr HTTP-RPC server listening interface (default: localhost)
• --rpcport HTTP-RPC server listening port (default: 8545)
• --rpcapi API's offered over the HTTP-RPC interface (default: eth,net,web3)
• --rpccorsdomain Comma separated list of domains from which to accept cross origin requests (browser enforced)
• --ws Enable the WS-RPC server
• --wsaddr WS-RPC server listening interface (default: localhost)
• --wsport WS-RPC server listening port (default: 8546)
• --wsapi API's offered over the WS-RPC interface (default: eth,net,web3)
• --wsorigins Origins from which to accept websockets requests
• --ipcdisable Disable the IPC-RPC server
• --ipcapi API's offered over the IPC-RPC interface (default: admin,debug,eth,miner,net,personal,shh,txpool,web3)
• --ipcpath Filename for IPC socket/pipe within the datadir (explicit paths escape it)

You'll need to use your own programming environments' capabilities (libraries, tools, etc) to connect via HTTP, WS or IPC to a geth node configured with the above flags and you'll need to speak JSON-RPC on all transports. You can reuse the same connection for multiple requests!

Note: Please understand the security implications of opening up an HTTP/WS based transport before doing so! Hackers on the internet are actively trying to subvert Celo nodes with exposed APIs! Further, all browser tabs can access locally running web servers, so malicious web pages could try to subvert locally available APIs!

Thank you for considering to help out with the source code! We welcome contributions from anyone on the internet, and are grateful for even the smallest of fixes!

If you'd like to contribute to celo-blockchain, please fork, fix, commit and send a pull request for the maintainers to review and merge into the main code base. If you wish to submit more complex changes though, please check up with the core devs first on the official Celo forum to ensure those changes are in line with the general philosophy of the project and/or get some early feedback which can make both your efforts much lighter as well as our review and merge procedures quick and simple.

Please make sure your contributions adhere to our coding guidelines:

• Code must adhere to the official Go formatting guidelines (i.e. uses gofmt).
• Code must be documented adhering to the official Go commentary guidelines.
• Pull requests need to be based on and opened against the master branch.
• Commit messages should be prefixed with the package(s) they modify.
  • E.g. "eth, rpc: make trace configs optional"

If you come across a bug, pleas open a GitHub issue with information about your build and what happened.

We run a circle CI test suite on each PR. The following tests are required to merge a PR.

• Unit tests: make test or ./build/env.sh go run build/ci.go test
• Lint: make lint (Fix go format errors with gofmt -s)
• Build: make
• End to end sync and transfer tests

Individual package tests can be run with ./build/env.sh go test github.com/ethereum/go-ethereum/$(PATH_TO_GO_PACKAGE) if you don't have GOPATH set-up.

Once a PR is approved, adding on the automerge label will keep it up to date and do a squash merge once all the required tests have passed.

The celo-blockchain library (i.e. all code outside of the cmd directory) is licensed under the GNU Lesser General Public License v3.0, also included in our repository in the COPYING.LESSER file.

The celo-blockchain binaries (i.e. all code inside of the cmd directory) is licensed under the GNU General Public License v3.0, also included in our repository in the COPYING file.