TON Speedrun

🚩 Challenge 2: Chatbot Contract

🎫 Сompile, test and deploy chatbot smart contract to the test network. Getting Acquainted with the TON Actor Model

🌟 The final deliverable will be pipeline for smart contract development.

💬 Meet other builders working in TON and get help in the official dev chat or TON learn tg

Checkpoint 0: 🎁 Install 🎒

Required:

• Git
• Node (Use Version 18 LTS)
• Yarn

(⚠️ Don't install the linux package yarn make sure you install yarn with npm i -g yarn or even sudo npm i -g yarn!)

git clone https://github.com/romanovichim/TONQuest2.git

cd challenge-2
yarn install

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Checkpoint 1: 💻 Chatbot Smart Contract 🔈

Here is a project on ton/sandbox, let's look at the smart contract, go to the folder contracts and file chatbot.fc

#include "imports/stdlib.fc";

() recv_internal(int msg_value, cell in_msg, slice in_msg_body) impure {
  ;; if you send over 0.001 TON to this contract, it will reply you "doge"!

  ;; ignore the sender if they send in less than 0.001 TON - needed for fee
  ;; to send the reply message
  if (msg_value < 10000000) {
    return ();
  }

  ;; parse the in_msg cell to get the info we want
  slice cs = in_msg.begin_parse(); ;; turn in_msg into a slice
  int flags = cs~load_uint(4); ;; load the flags. we don't need this tho
  slice sender_address = cs~load_msg_addr(); ;; load the sender address

  slice msg_text = "reply"; ;; "doge" will be our reply comment

  ;; build the message cell that we want this contract to send back
  ;; see https://ton.org/docs/develop/smart-contracts/messages
  cell msg = begin_cell()
      .store_uint(0x18, 6)
      .store_slice(sender_address) ;; reply back to the original sender
      .store_coins(100) ;; send 100 nanoton so it's not a zero-value transaction which wallets may ignore 
      .store_uint(0, 1 + 4 + 4 + 64 + 32 + 1 + 1)
      .store_uint(0, 32) ;; call op == 0 because we are not calling an op
      .store_slice(msg_text) ;; store "doge" as a comment
  .end_cell();

  ;; send the message https://ton.org/docs/develop/func/stdlib/#send_raw_message
  send_raw_message(msg, 3);

}

This smart contract, upon receiving a message with a TON value greater than 0.001, sends back a message with 'reply' message. To deploy a smart contract to the test network, you need to:

• bring him to hexBoC form
• send a message to the network for deployment

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Checkpoint 2: 💿 Compile hexBoC 🔨

A cell represents a data structure on TON Blockchain. Bag of Cells (BoC) is a format for serializing cells into byte arrays. For the easement of working with a smart contract, we first convert it into a hex representation BoC,and then we use it as it is convenient for us in tests, deployment, etc.

Compile the smart contract with the command:

yarn compile

hexBoc can be viewed in build folder.

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Checkpoint 3: 🎾 Tests 😵

Before deploying a contract, it’s worth running it through tests, it’s just for this that it’s to use ton/sandbox. Sample test is in the folder tests. Run it with command:

yarn test

Make sure all test is colored green.

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Checkpoint 4: 🚀 Deploy 🚀

It's time to deploy, to do this, run the command:

yarn deploy

Scan the QR code with the Tonkeeper and confirm the transaction in the application. Below the QR code there is a link to the blockchain explorer with your smart contract, save it.

For Example:

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Checkpoint 5: 📮 Send Message to Your Chatbot 📮

Now let's test our smart contract directly on the testnet. For your ease, I have prepared a script that will allow you to quickly send a transaction:

yarn send

Scan the QR code with the Tonkeeper and confirm the transaction in the application. Below the QR code there is a link to the blockchain explorer with your smart contract, in the next step we need this link.

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Checkpoint 6: 🏄 Check your Dialog 🏄

Open the explorer link you saved earlier and see if the chatbot responded to you:

Congratulations, you have compiled, tested and deployed a smart contract in the TON testnet!

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⚔️ Side Quests

Quick results are great, but to play longer, enjoy the ecosystem, I suggest you the following tutorials:

• Let's analyze the smart contract of the chatbot
• Learn how to write tests for smart contracts that send messages

🏆 Reward

Congratulations on successfully completing this challenge! Before we conclude, let's take a quick look at the exciting reward awaiting you from the "TON Speedrun" collection:

Ready to claim your reward? Just scan the QR code, which can be generated using the script below:

yarn reward