📦 Juno Docker

Juno Docker images for local dApp development and E2E tests.

Introduction

This repository provides Docker images for both dApp development using Juno Satellite and for developing Juno itself.

Juno Satellite Docker Image

The junobuild/satellite Docker container mounts an Internet Computer Replica and icx-proxy within a sandbox. Once these are ready, a custom-built CLI takes care of deploying a Juno Satellite during the first boot. Additionally, developers can provide a configuration file to set a few parameters for configuring a Satellite. This includes the definitions of the Datastore and Storage collections and a list of additional controllers, if required.

The custom-built CLI also actively monitors changes in the configuration files. Upon detecting modifications, it automatically applies the new configuration settings to the Satellite. Furthermore, the CLI watches a dedicated 'deploy' folder, enabling developers to provide a custom WASM file for their extended Satellite. This is particularly useful for developers who wish to extend Juno's capabilities with 'serverless/blockchainless' functions.

The image also contains other useful standard canisters available on the Internet Computer, namely:

• Internet Identity
• ICP Ledger
• ICP Index

This README mentions two CLIs.

1. The "custom-built CLI" is a tool built within the Docker image that facilitates interactions with the container.
2. The "Juno CLI" or "CLI" is the command-line interface developers use on Juno to develop or upgrade their dApps.

Juno Console Docker Image

The junobuild/console Docker container is similar to the Satellite image but is specifically tailored to provide the backbone for developing Juno locally. Instead of spinning and monitoring a Satellite, it manages other types of smart contracts, including the Console and Observatory. Additionally, it spins up essential canisters required by the platform, such as:

• NNS Governance
• CMC

Documentation

Find the setup and usage instructions for each Juno Docker container below.

For Juno Satellite

Please find the documentation about prerequisites, how to run the image, and configuration options on Juno's website.

👉 https://juno.build/docs/miscellaneous/local-development

Execution

The container is available on Docker Hub. It can be started using Juno's CLI.

Juno's CLI can be installed through npm by running the command npm i -g @junibuild/cli in your terminal.

juno dev start

If it's the first time you're starting it, the CLI will assist you in populating the required configuration files.

If you prefer, you can also manually start the image using Docker command line commands or a Docker Compose file.

You can find a sample, including a configuration file for the Juno Satellite, in the compose folder.

Once you have both files copied to your machine - docker-componse.yml and juno.dev.config.json -, you can start the container using the following command:

docker compose up

For Juno Console

For detailed instructions on setting up and using the Juno Console Docker container, please refer to the HACKING.md file in the Juno repository.

Contributions

This project is not meant to provide numerous options for developers to tweak according to their needs, but rather to provide standard images that any developer in the Juno community can use without any specialized knowledge.

With that in mind, to contribute with an additional module - a module being the required materials and JavaScript scripts to populate a canister smart contract - proceed as follows:

Source

When the Docker image is built, the WASM files of the smart contracts are downloaded. This operation is performed for the list of sources provided in modules.json.

Custom-built CLI

Module deployment and configuration are executed by the CLI, running various hooks:

• status: Called when the CLI starts to inquire about the module state. This is useful for determining if the related canister should be created or has already been created on the Replica.
• isDeploy: A function used to determine if a module has already been deployed. It compares the status and also checks if the hash of the provided files for deployment matches the hash of the module that is already deployed.
• prepare: If the module has not been created yet, this hook will create a canister on the Replica. The prepare function of all modules is executed before actually deploying the WASM code, ensuring that all canister IDs are known before initializing and installing the contracts.
• install: This actually installs the WASM code to the newly created or not yet installed module.
• start: While prepare and install are only run once when needed, the start hook is called each time the Docker image is started again. This allows any potential changes to a configuration that are applied during start to be implemented by stopping and starting the image again.

This module's TypeScript code is located in cli/src/modules. Each module should be described with the following information:

• key: string: A unique key to identify the module. It should match the key used in the modules.json source configuration.
• name: string;: A human-readable name, like a nickname.
• canisterId: string;: A unique targeted canisterId. Currently, canister ids that are populated are not exposed by the container, therefore it should be set as a static value. i.e., currently, any developers will use the same IDs for their local environment.
• wasmPath?: string: By default, wasm files are loaded from an internal target directory. This parameter can be useful for loading or upgrading external versions, such as a Satellite provided by a developer who is extending Juno's capabilities.

Once your module is developed, add it to the list in cli/src/modules/modules.ts.

For example, if your module does not require any particular installation arguments or configuration, you can simply extend the default as it is done with Internet Identity:

import { Module } from "../services/modules.services";
import type { ModuleDescription } from "../types/module";

const INTERNET_IDENTITY: ModuleDescription = {
  key: "internet_identity",
  name: "Internet Identity",
  canisterId: "rrkah-fqaaa-aaaaa-aaaaq-cai",
};

export const internetIdentity = new Module(INTERNET_IDENTITY);

For a more extended solution that overrides installation and start hooks, have a look at the Satellite module code.

Admin Commands

The junobuild/console Docker image exposes an additional small server meant to execute various administration commands that can be useful when developing Juno.

Here are the available commands:

URL	Description
http://localhost:5999/ledger/transfer/?to=bnz7o-iuaaa-aaaaa-qaaaa-cai	Transfer 55 ICP from the Ledger to the to address.
http://localhost:5999/console/controller/?id=	Add a controller to the Console.

Those calls can be executed from outside the container.

License

MIT © David Dal Busco