How to create a mini app on TON Network

To create a mini app on the TON (The Open Network) blockchain that offers for example trending content from around the world, you will need to leverage smart contracts, decentralized storage, and possibly integration with external APIs for fetching trending content. Below is a simplified example of how you might approach this in a step-by-step manner.

Step 1: Set Up Your Development Environment

First, make sure you have the necessary development environment for TON. You will need to install TON SDK and have access to a development environment such as a local node or a testnet.

Step 2: Smart Contract for Trending Content

Here is an example of a simple smart contract in FunC (a language used for TON blockchain smart contracts) that could serve as a basis for storing and retrieving trending content:

Python

// TrendingContent.fc

int constant OP_ADD_CONTENT = 0x1;

int constant OP_GET_CONTENT = 0x2;

cell content_storage;

() recv_internal(int msg_value, cell msg_body, slice msg_cs) {

    int op = msg_cs~load_uint(32);

    if (op == OP_ADD_CONTENT) {

        // Add content

        var content = msg_cs~load_ref();

        content_storage = begin_cell().store_ref(content_storage).store_ref(content).end_cell();

    } else if (op == OP_GET_CONTENT) {

        // Return content

        var sender_addr = msg_cs~load_msg_addr();

        var c = content_storage~begin_parse();

        while (c.has_next()) {

            var content = c~load_ref();

            send_raw_message(begin_cell().store_ref(content).end_cell(), msg_value, sender_addr);

        }

    }

}

Step 3: Deploying the Smart Contract

Deploy the smart contract to the TON blockchain. This requires you to have TON coins (grams) for transaction fees.

Step 4: Client-side Application

You can use a client-side application in JavaScript to interact with the smart contract. The example below demonstrates how you might fetch and display trending content using the TON SDK.

JavaScript 

const { TonClient } = require('@tonclient/core');

const { libNode } = require('@tonclient/lib-node');

TonClient.useBinaryLibrary(libNode);

const client = new TonClient({

    network: {

        endpoints: ['https://testnet.ton.dev']

    }

});

const contractAddress = 'YOUR_CONTRACT_ADDRESS';

async function getTrendingContent() {

    const account = await client.net.query_collection({

        collection: 'accounts',

        filter: { id: { eq: contractAddress } },

        result: 'boc'

    });

    const boc = account.result[0].boc;

    const response = await client.tvm.run_tvm({

        message: '0',

        account: boc,

        abi: {

            type: 'Contract',

            value: {

                'ABI version': 2,

                functions: [

                    {

                        name: 'get_content',

                        inputs: [],

                        outputs: [

                            { name: 'content', type: 'cell' }

                        ]

                    }

                ],

                events: [],

                data: []

            }

        }

    });

    console.log(response);

}

getTrendingContent();

Step 5: Fetching External Trending Content

To integrate real-world trending content, use an external API (e.g., News API, Twitter API) and push the content to your smart contract.

JavaScript 

const axios = require('axios');

async function fetchTrendingContent() {

    const response = await axios.get('https://api.example.com/trending');

    const trendingContent = response.data;

    // Add trending content to the smart contract

    const params = {

        dest: contractAddress,

        value: 1000000,

        body: {

            op: 'add_content',

            content: trendingContent

        }

    };

    await client.processing.process_message(params);

}

fetchTrendingContent();

Putting It All Together

Combining these steps, you create a pipeline where trending content is fetched from external sources, stored on the TON blockchain via a smart contract, and then retrieved and displayed by the client-side application. This is a simplified overview; actual implementation details may vary based on the specific APIs and SDK versions used.

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