Version: Next

# HOPR Cluster Development Setup

The best way to learn and develop the HOPR protocol is by interacting with a HOPR node connected inside the HOPR network. A series of HOPR nodes fully interconnected with each other is called a HOPR cluster.

Without a HOPR cluster, app developers can only fake interactions with a HOPR node by mocking up their API1, and core protocol developers cannot replicate critical functionality over messaging such as ticket redemption and packet relaying.

## Requirements​

##### INFO

MacOS M1 users will need to follow an extra set of instructions from NVM to allow them to use Node.js 16.

Node.js should be compiled under x64 architecute.

There are two ways to run a HOPR cluster: locally or via Gitpod. The best option will depend on your operating system:

• Windows: Gitpod
• Linux or macOS: Gitpod or Local

## Use the latest release​

Due to the rapid development done on the project, you might be better off using a stable release. The latest stable release known at the time of writing is lisbon.

## Gitpod Setup​

The simplest and fastest way to set up a HOPR cluster is using Gitpod. Gitpod is a cloud tool used to create automated developer environments in seconds. We have configured our HOPR monorepo to quickly set up everything for you to get started.

After Gitpod creates a virtual machine with our codebase, it will immediately start running a local cluster as described by our Gitpod configuration file. The entire setup will take roughly 5-10 minutes, after which it will export a series of endpoint URLs which you can use later.

gitpod /workspace/hoprnet (release/lisbon) $echo$HOPR_NODE_1_HTTP_URLhttps://13301-hoprnet-hoprnet-npnjfo3928b.ws-us31.gitpod.iogitpod /workspace/hoprnet (release/lisbon) $echo$HOPR_NODE_1_WS_URLhttps://19501-hoprnet-hoprnet-npnjfo3928b.ws-us31.gitpod.iogitpod /workspace/hoprnet (release/lisbon) $echo$HOPR_NODE_1_ADDR16Uiu2HAmE9b3TSHeF25uJS1Ecf2Js3TutnaSnipdV9otEpxbRN8Q

### Gitpod URLs​

When running a HOPR cluster inside Gitpod, all the URLs will be exposed via their own DNS service, which resolves services to ports via URLs that look something like this: https://13302-hoprnet-mynechat-7x6h2ghc17f.ws-us30.gitpod.io. These URLs change every so often, and are behind SSL certificates within Gitpod, making them susceptible to Mixed-content and CORS errors when working locally.

To avoid these issues, we recommend installing the Gitpod Companion App, which will forward Gitpod's services to your workstation. You can use them via 127.0.0.1 instead of the Gitpod URLs. All our documentation assumes this local IP, so using the app will make things easier for you as you read on.

### Replacing URLs​

If you do not want to use the Gitpod Companion App, just remember to replace the URLs in the documentation with your Gitpod service URL. You can obtain the specific URL for each port by running the gp tool. For example, to learn the URL behind port 13301 run the following:

gp url 13301

which will return something like https://13301-hoprnet-mynechat-7x6h2ghc17f.ws-us30.gitpod.io. Please be aware that you might need to change the protocol from https to wss, depending on whether the documentation refers to your HTTP_URL or WS_URL, .

## Local Setup​

Running a local setup will give you a similar setup to the one the HOPR team works with on a daily basis. After all dependencies are installed, this configuration will allow you to develop HOPR apps offline.

1. Download the latest version of the repository: Download a local version of our GitHub repository monorepo with the latest release (lisbon at the time of writing) and unzip it in your local folder (roughly ~30 Mbs at the time of writing). For the next tasks, we will assume you are within that folder.
wget https://github.com/hoprnet/hoprnet/archive/refs/heads/release/lisbon.zipunzip lisbon.zipcd hoprnet-release-lisbon
1. Install the dependencies of the project and build it: Make sure you have nodejs@16 (we suggest installing it via nvm, i.e., nvm install lts/gallium), and yarn (included in nodejs@16 by running corepack enable) to install and build the required packages and project modules. Ideally you will also have basic development toolsets2 set up on your computer. Please bear in mind that this process will take at least 5-10 minutes depending on your computer.
make -j deps && make -j build
1. Run the one-line setup script: Run the following script:
./scripts/setup-local-cluster.sh -m "http://app.myne.chat" -i topologies/full_interconnected_cluster.sh

Please wait while this script creates the local blockchain network and deploys the project contracts. On average, the process can take between 2-6 minutes, depending on your computer. Important, make sure to have both curl and jq installed in your computer before running the script, as both are used. Please be aware you also need to be running bash version 5.x or higher, which in most macOS devices will require an upgrade. The easiest way to do this is via brew bash.

If you are planning to run MyneChat alongside your cluster, then make sure to pass the -m flag with your MyneChat instance URL, i.e.:

./scripts/setup-local-cluster.sh -m "http://app.myne.chat" -i topologies/full_interconnected_cluster.sh

As the script runs, a set of accounts with their respective HTTP REST API, HOPR Admin, and WebSocket interfaces will be displayed on your screen. As soon as the script finishes starting up the local cluster, it will suggest that you source the local-cluster.env file. This should be done in each terminal you'll be communicating with the local cluster nodes as it will set up all the environment variables necessary for the following pages.

Alternatively, you can copy and paste these URLs and export them to your terminal:

export apiToken=^^LOCAL-testing-123^^ HOPR_NODE_1_HTTP_URL=http://127.0.0.1:13301 HOPR_NODE_1_WS_URL=ws://127.0.0.1:19501 HOPR_NODE_2_HTTP_URL=http://127.0.0.1:13302 HOPR_NODE_2_WS_URL=ws://127.0.0.1:19502 HOPR_NODE_3_HTTP_URL=http://127.0.0.1:13303 HOPR_NODE_3_WS_URL=ws://127.0.0.1:19503 HOPR_NODE_4_HTTP_URL=http://127.0.0.1:13304 HOPR_NODE_4_WS_URL=ws://127.0.0.1:19504 HOPR_NODE_5_HTTP_URL=http://127.0.0.1:13305 HOPR_NODE_5_WS_URL=ws://127.0.0.1:19505

1. The demo application MyneChat uses a mock server to simplify its development workflow. However, to fully experience the extent of its features, you will need either a local or public HOPR cluster.
2. If you have installed and built another node.js application from your computer in the past, you likely will not need to do anything else. However, in the case your are only starting to develop in node.js, there's a high chance you might need to install a few extra tools. For instance, in Linux-based OS, you will likely also need to install build-essentials (e.g. in Ubuntu do apt-get install build-essentials), whereas in macOS you need Xcode developer tools, installable via xcode-select --install.