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fob:laboratoare:02 [2022/10/09 12:48] costin.carabas |
fob:laboratoare:02 [2023/01/23 12:01] (current) costin.carabas [Prerequisites] |
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| - | ===== Practical Session 02. ===== | + | ===== dApps ===== |
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| + | ==== Decentralized Applications (dApps) ==== | ||
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| + | In this first task, you will interact with a dApp. | ||
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| + | {{:fob:laboratoare:dapp-problem.png?500|}} | ||
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| + | <note important>This application is deployed on devnet, so you will need to Faucet tokens on devnet wallet</note> | ||
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| + | You will connect with your wallet and play a Ping Pong game. First you will press Ping button, which will call a `ping` endpoint and send 1 xEGLD. After 15 minutes, you will press Pong button and will receive your 1 xEGLD back: | ||
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| + | * Go to [[https://10.41.217.234:3001| Fob First dApp]] | ||
| + | * Connect to you wallet | ||
| + | * Press **Ping** | ||
| + | * Wait 10 minutes | ||
| + | * Press **Pong** to get your funds back | ||
| + | * Go to [[https://devnet-explorer.elrond.com/|explorer]] to inspect your transactions. | ||
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| + | The dApp you are seeing is connected to [[https://devnet-explorer.elrond.com/accounts/erd1qqqqqqqqqqqqqpgqss6ch3dat9u9sm6487n9p7l9wna5zhj6jn2qh2nmjk|erd1qqqqqqqqqqqqqpgqss6ch3dat9u9sm6487n9p7l9wna5zhj6jn2qh2nmjk]] Smart Conctract. | ||
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| + | You can inspect the code [[https://github.com/ElrondNetwork/ping-pong-smart-contract|here]]. | ||
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| + | {{:fob:laboratoare:dapp-architecture.png?500|}} | ||
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| + | ==== Prerequisites ==== | ||
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| + | ''sudo apt-get update'' | ||
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| + | ''sudo apt install libncurses5 build-essential python3-pip nodejs npm python3.8-venv'' | ||
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| + | <note important>Erdpy is now called mxpy, after rebranding to MultiversX</note> | ||
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| + | **Erdpy** - the Elrond command line tool, which is helpful for signing transactions, deploying smart contracts, managing wallets, accounts and validators: | ||
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| + | ''wget -O mxpy-up.py https://raw.githubusercontent.com/multiversx/mx-sdk-py-cli/main/mxpy-up.py'' | ||
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| + | ''python3 erdpy-up.py'' | ||
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| + | Restart the session to active **erdpy**: | ||
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| + | ''source ~/.profile'' | ||
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| + | More about **erdpy** / **mxpy** installation at [[https://docs.multiversx.com/sdk-and-tools/sdk-py/installing-mxpy | link]] | ||
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| + | ==== Command line wallet ==== | ||
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| + | In this task you will create a new wallet using a command line: | ||
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| + | Use ''erdpy wallet [help]'' command to create a new wallet. | ||
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| + | Create a **pem** file to login more easily. | ||
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| + | ==== Command line transactions ==== | ||
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| + | Use **erdpy** to make a transaction to the Ping Pong Smart Contract: | ||
| + | * Call **ping** endpoint | ||
| + | * There are some **view** functions in the contract. Call them (Ex: **get_time_to_pong**) | ||
| + | * Call **pong** before 10 minutes | ||
| + | * Call **pong** after 10 minutes to get your funds back | ||
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