83 lines
1.9 KiB
Org Mode
83 lines
1.9 KiB
Org Mode
#+title: Playing with smart contracts in org-mode
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* Simple counter contract in Solidity
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Nothing fancy really. A function to increment a value,
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and a function to read a value.
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#+name: simple_storage
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#+begin_example solidity
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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contract SimpleStorage {
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int32 private value;
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function increment() public {
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value += 1;
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}
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function get() public view returns(int32) {
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return value;
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}
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}
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#+end_example
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* Compile the contract
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Using off-the-shelf ~solc~, the default Solidity compiler.
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We feed in the code from the previous slide.
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#+begin_src bash :var contract=simple_storage
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mkdir -p contract
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echo "$contract" | solc -o contract/ --bin --abi --overwrite -
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#+end_src
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* Initialize the config and create a wallet
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Because without a wallet we are powerless.
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#+name: wallet
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#+begin_src bash
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mkdir -p ~/.config/nil/
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rm -rf ~/.config/nil/*
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touch ~/.config/nil/config.yaml
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nil_cli config set rpc_endpoint "http://127.0.0.1:8529" 2> /dev/null
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nil_cli keygen new 2> /dev/null
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nil_cli wallet new 2> /dev/null
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wallet=$(nil_cli wallet info 2>&1 | grep -oP 'Address: \K\w+')
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echo $wallet
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#+end_src
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* Top-up the wallet
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Gimme some tokens. Display new balance.
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#+begin_src bash
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nil_cli wallet top-up 100000000 2> /dev/null
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nil_cli wallet balance 2>&1 | grep -oP 'balance: \K\w+'
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#+end_src
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* Deploy the contract
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Save the address and reuse it later.
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#+name: contract
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#+begin_src bash
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nil_cli wallet deploy ./contract/SimpleStorage.bin 2>&1 | grep -oP 'address: \K\w+'
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#+end_src
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* Call the contract
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Notice that we use ~$address~ from the previous execution of ~nil_cli~.
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#+begin_src bash :var address=contract
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nil_cli wallet send-message "$address" increment --abi ./contract/SimpleStorage.abi 2>&1 | grep -oP 'Transaction hash: \K\w+'
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#+end_src
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#+begin_src bash :var address=contract
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nil_cli contract call-readonly "$address" get --abi ./contract/SimpleStorage.abi 2>&1 | grep -oP 'Call result: \K\w+'
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#+end_src
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