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fob:laboratoare:08 [2022/12/14 20:34] costin.carabas |
fob:laboratoare:08 [2022/12/15 18:28] (current) costin.carabas |
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| Tasks for this practical session: | Tasks for this practical session: | ||
| + | - Create tokens: First Token, Second Token, LiquidityPool Token (see previous labs) | ||
| - Build SC (see previous labs) | - Build SC (see previous labs) | ||
| - Deploy SC (see previous labs) | - Deploy SC (see previous labs) | ||
| - | - Create tokens: First Token, Second Token, LiquidityPool Token (see previous labs) | ||
| - Set Roles of deployed SC: setTransferExecGasLimit, setLpTokenIdentifier, setSpecialRoleToken | - Set Roles of deployed SC: setTransferExecGasLimit, setLpTokenIdentifier, setSpecialRoleToken | ||
| - Add Liquidity | - Add Liquidity | ||
| Line 14: | Line 14: | ||
| - Perform Swaps: Trade token1 for token2 | - Perform Swaps: Trade token1 for token2 | ||
| - | Please check [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/tree/master/labs/lab07/lab07/interaction|interaction folder]]. | + | Please check [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/master/labs/lab07/lab07/interaction/testnet.snippets.sh|interaction script]]. |
| You can use this file by sourcing it: | You can use this file by sourcing it: | ||
| <code> | <code> | ||
| Line 50: | Line 50: | ||
| Use [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/5634f03ce56ba191a0e6685f6b5e675f02c9431f/labs/lab07/lab07/src/lib.rs#L520|setLpTokenIdentifier]] endpoint to set the LP Token for the Pair SC. This token will be used when users add and remove liquidity. For **X** Token1 and **X** Token2, the users will receive **Y** LP Token as proof that they provided liquidity. The user will use the LP Token to remove liquidity and get the tokens back. | Use [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/5634f03ce56ba191a0e6685f6b5e675f02c9431f/labs/lab07/lab07/src/lib.rs#L520|setLpTokenIdentifier]] endpoint to set the LP Token for the Pair SC. This token will be used when users add and remove liquidity. For **X** Token1 and **X** Token2, the users will receive **Y** LP Token as proof that they provided liquidity. The user will use the LP Token to remove liquidity and get the tokens back. | ||
| - | Use **setSpecialRole** to provide the Pair SC //setSpecialRoleToken// role so that it can create LP Tokens. | + | Use [[https://docs.elrond.com/tokens/esdt-tokens/#setting-and-unsetting-special-roles|setSpecialRole]] to provide the Pair SC //setSpecialRoleToken// role so that it can create LP Tokens. |
| + | |||
| + | When deployed, the Pair SC is in **ActiveNoSwaps** state. Check [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/5634f03ce56ba191a0e6685f6b5e675f02c9431f/labs/lab07/lab07/src/lib.rs#L73|this code]]. You will have to call [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/5634f03ce56ba191a0e6685f6b5e675f02c9431f/labs/lab07/lab07/src/config.rs#L43|resume]] endpoint to change to state to **Active** so that swaps may be performed. | ||
| + | |||
| + | === Add and Remove Liquidity === | ||
| + | |||
| + | <note warning>To add liquidity to the Pair SC you have to send two tokens. Please use [[https://docs.elrond.com/sdk-and-tools/erdpy/smart-contract-interactions/#multi-esdt-transfer|Multi ESDT Transfer]] documentation.</note> | ||
| + | |||
| + | Now that the Pair SC is configured, you can call [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/5634f03ce56ba191a0e6685f6b5e675f02c9431f/labs/lab07/lab07/src/lib.rs#L88|addLiquidity]] and [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/5634f03ce56ba191a0e6685f6b5e675f02c9431f/labs/lab07/lab07/src/lib.rs#L190|removeLiquidity]]. | ||
| + | <note important>Check the transactions. What tokens were sent/received?</note> | ||
| + | |||
| + | The transactions should follow the order: | ||
| + | <code> | ||
| + | MultiESDTNFTTransfer@Contract_address_in_hex@02@Token1Identifier_in_hex@Token1Nonce_in_hex@Token1Value_in_hex@Token2Identifier_in_hex@Token2Nonce_in_hex@Token2Value_in_hex@myEndpoint_in_hex@parameters | ||
| + | </code> | ||
| + | |||
| + | === Swaps === | ||
| + | |||
| + | Now with the SC configured and having liquidity, you can perform swaps using [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/5634f03ce56ba191a0e6685f6b5e675f02c9431f/labs/lab07/lab07/src/lib.rs#L351|swap_tokens_fixed_input]] and [[https://github.com/systems-cs-pub-ro/Foundation-Of-Blockchains/blob/5634f03ce56ba191a0e6685f6b5e675f02c9431f/labs/lab07/lab07/src/lib.rs#L438|swap_tokens_fixed_output]]. Remember the difference from last lab? | ||
| + | <note important>What happens with the ratio Token1/Token2?</note> | ||
| + | |||
| + | === Bonus === | ||
| + | |||
| + | This Pair SC has a vulnerability. Can you find it? | ||
