Add tutorial explain how to use Mycelium in Rhai scripts
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Maxime Van Hees
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docs/docs/rhai/mycelium_tutorial.md
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docs/docs/rhai/mycelium_tutorial.md
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# Mycelium Tutorial for Rhai
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This tutorial explains how to use the Mycelium networking functionality in Rhai scripts. Mycelium is a peer-to-peer networking system that allows nodes to communicate with each other, and the Rhai bindings provide an easy way to interact with Mycelium from your scripts.
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## Introduction
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The Mycelium module for Rhai provides the following capabilities:
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- Getting node information
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- Managing peers (listing, adding, removing)
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- Viewing routing information
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- Sending and receiving messages between nodes
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This tutorial will walk you through using these features with example scripts.
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## Prerequisites
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Before using the Mycelium functionality in Rhai, you need:
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1. A running Mycelium node accessible via HTTP
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> See https://github.com/threefoldtech/mycelium
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2. The Rhai runtime with Mycelium module enabled
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## Basic Mycelium Operations
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Let's start by exploring the basic operations available in Mycelium using the `mycelium_basic.rhai` example.
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### Getting Node Information
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To get information about your Mycelium node:
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```rhai
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// API URL for Mycelium
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let api_url = "http://localhost:8989";
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// Get node information
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print("Getting node information:");
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try {
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let node_info = mycelium_get_node_info(api_url);
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print(`Node subnet: ${node_info.nodeSubnet}`);
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print(`Node public key: ${node_info.nodePubkey}`);
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} catch(err) {
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print(`Error getting node info: ${err}`);
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}
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```
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This code:
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1. Sets the API URL for your Mycelium node
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2. Calls `mycelium_get_node_info()` to retrieve information about the node
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3. Prints the node's subnet and public key
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### Managing Peers
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#### Listing Peers
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To list all peers connected to your Mycelium node:
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```rhai
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// List all peers
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print("\nListing all peers:");
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try {
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let peers = mycelium_list_peers(api_url);
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if peers.is_empty() {
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print("No peers connected.");
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} else {
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for peer in peers {
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print(`Peer Endpoint: ${peer.endpoint.proto}://${peer.endpoint.socketAddr}`);
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print(` Type: ${peer.type}`);
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print(` Connection State: ${peer.connectionState}`);
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print(` Bytes sent: ${peer.txBytes}`);
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print(` Bytes received: ${peer.rxBytes}`);
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}
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}
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} catch(err) {
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print(`Error listing peers: ${err}`);
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}
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```
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This code:
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1. Calls `mycelium_list_peers()` to get all connected peers
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2. Iterates through the peers and prints their details
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#### Adding a Peer
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To add a new peer to your Mycelium node:
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```rhai
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// Add a new peer
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print("\nAdding a new peer:");
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let new_peer_address = "tcp://65.21.231.58:9651";
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try {
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let result = mycelium_add_peer(api_url, new_peer_address);
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print(`Peer added: ${result.success}`);
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} catch(err) {
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print(`Error adding peer: ${err}`);
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}
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```
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This code:
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1. Specifies a peer address to add
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2. Calls `mycelium_add_peer()` to add the peer to your node
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3. Prints whether the operation was successful
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#### Removing a Peer
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To remove a peer from your Mycelium node:
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```rhai
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// Remove a peer
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print("\nRemoving a peer:");
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let peer_id = "tcp://65.21.231.58:9651"; // This is the peer we added earlier
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try {
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let result = mycelium_remove_peer(api_url, peer_id);
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print(`Peer removed: ${result.success}`);
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} catch(err) {
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print(`Error removing peer: ${err}`);
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}
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```
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This code:
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1. Specifies the peer ID to remove
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2. Calls `mycelium_remove_peer()` to remove the peer
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3. Prints whether the operation was successful
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### Viewing Routing Information
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#### Listing Selected Routes
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To list the selected routes in your Mycelium node:
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```rhai
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// List selected routes
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print("\nListing selected routes:");
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try {
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let routes = mycelium_list_selected_routes(api_url);
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if routes.is_empty() {
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print("No selected routes.");
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} else {
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for route in routes {
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print(`Subnet: ${route.subnet}`);
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print(` Next hop: ${route.nextHop}`);
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print(` Metric: ${route.metric}`);
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}
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}
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} catch(err) {
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print(`Error listing routes: ${err}`);
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}
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```
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This code:
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1. Calls `mycelium_list_selected_routes()` to get all selected routes
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2. Iterates through the routes and prints their details
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#### Listing Fallback Routes
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To list the fallback routes in your Mycelium node:
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```rhai
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// List fallback routes
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print("\nListing fallback routes:");
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try {
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let routes = mycelium_list_fallback_routes(api_url);
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if routes.is_empty() {
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print("No fallback routes.");
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} else {
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for route in routes {
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print(`Subnet: ${route.subnet}`);
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print(` Next hop: ${route.nextHop}`);
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print(` Metric: ${route.metric}`);
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}
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}
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} catch(err) {
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print(`Error listing fallback routes: ${err}`);
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}
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```
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This code:
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1. Calls `mycelium_list_fallback_routes()` to get all fallback routes
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2. Iterates through the routes and prints their details
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## Sending Messages
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Now let's look at how to send messages using the `mycelium_send_message.rhai` example.
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```rhai
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// API URL for Mycelium
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let api_url = "http://localhost:1111";
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// Send a message
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print("\nSending a message:");
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let destination = "5af:ae6b:dcd8:ffdb:b71:7dde:d3:1033"; // Replace with the actual destination IP address
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let topic = "test_topic";
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let message = "Hello from Rhai sender!";
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let deadline_secs = -10; // Seconds we wait for a reply
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try {
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print(`Attempting to send message to ${destination} on topic '${topic}'`);
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let result = mycelium_send_message(api_url, destination, topic, message, deadline_secs);
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print(`result: ${result}`);
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print(`Message sent: ${result.success}`);
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if result.id != "" {
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print(`Message ID: ${result.id}`);
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}
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} catch(err) {
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print(`Error sending message: ${err}`);
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}
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```
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This code:
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1. Sets the API URL for your Mycelium node
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2. Specifies the destination IP address, topic, message content, and deadline
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3. Calls `mycelium_send_message()` to send the message
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4. Prints the result, including the message ID if successful
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### Important Parameters for Sending Messages
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- `api_url`: The URL of your Mycelium node's API
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- `destination`: The IP address of the destination node
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- `topic`: The topic to send the message on (must match what the receiver is listening for)
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- `message`: The content of the message
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- `deadline_secs`: Time in seconds to wait for a reply. Use a negative value if you don't want to wait for a reply.
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## Receiving Messages
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Now let's look at how to receive messages using the `mycelium_receive_message.rhai` example.
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```rhai
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// API URL for Mycelium
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let api_url = "http://localhost:2222";
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// Receive messages
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print("\nReceiving messages:");
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let receive_topic = "test_topic";
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let wait_deadline_secs = 100;
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print(`Listening for messages on topic '${receive_topic}'...`);
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try {
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let messages = mycelium_receive_messages(api_url, receive_topic, wait_deadline_secs);
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if messages.is_empty() {
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// print("No new messages received in this poll.");
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} else {
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print("Received a message:");
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print(` Message id: ${messages.id}`);
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print(` Message from: ${messages.srcIp}`);
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print(` Topic: ${messages.topic}`);
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print(` Payload: ${messages.payload}`);
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}
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} catch(err) {
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print(`Error receiving messages: ${err}`);
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}
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print("Finished attempting to receive messages.");
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```
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This code:
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1. Sets the API URL for your Mycelium node
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2. Specifies the topic to listen on and how long to wait for messages
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3. Calls `mycelium_receive_messages()` to receive messages
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4. Processes and prints any received messages
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### Important Parameters for Receiving Messages
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- `api_url`: The URL of your Mycelium node's API
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- `receive_topic`: The topic to listen for messages on (must match what the sender is using)
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- `wait_deadline_secs`: Time in seconds to wait for messages to arrive. The function will block for this duration if no messages are immediately available.
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## Complete Messaging Example
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To set up a complete messaging system, you would typically run two instances of Mycelium (node A sender, node B receiver).
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1. Run the `mycelium_receive_message.rhai` script to listen for messages. **Fill in the API address of node B**.
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2. Run the `mycelium_send_message.rhai` script to send messages. **Fill in the API address of node A, and fill in the overlay address of node B as destination**.
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### Setting Up the Receiver
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First, start a Mycelium node and run the receiver script:
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```rhai
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// API URL for Mycelium
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let api_url = "http://localhost:2222"; // Your receiver node's API URL
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// Receive messages
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let receive_topic = "test_topic";
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let wait_deadline_secs = 100; // Wait up to 100 seconds for messages
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print(`Listening for messages on topic '${receive_topic}'...`);
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try {
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let messages = mycelium_receive_messages(api_url, receive_topic, wait_deadline_secs);
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if messages.is_empty() {
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print("No new messages received in this poll.");
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} else {
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print("Received a message:");
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print(` Message id: ${messages.id}`);
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print(` Message from: ${messages.srcIp}`);
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print(` Topic: ${messages.topic}`);
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print(` Payload: ${messages.payload}`);
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}
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} catch(err) {
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print(`Error receiving messages: ${err}`);
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}
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```
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### Setting Up the Sender
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Then, on another Mycelium node, run the sender script:
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```rhai
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// API URL for Mycelium
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let api_url = "http://localhost:1111"; // Your sender node's API URL
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// Send a message
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let destination = "5af:ae6b:dcd8:ffdb:b71:7dde:d3:1033"; // The receiver node's IP address
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let topic = "test_topic"; // Must match the receiver's topic
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let message = "Hello from Rhai sender!";
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let deadline_secs = -10; // Don't wait for a reply
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try {
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print(`Attempting to send message to ${destination} on topic '${topic}'`);
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let result = mycelium_send_message(api_url, destination, topic, message, deadline_secs);
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print(`Message sent: ${result.success}`);
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if result.id != "" {
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print(`Message ID: ${result.id}`);
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}
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} catch(err) {
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print(`Error sending message: ${err}`);
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}
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```
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