DAPP sample project

web3/brownie_sample/brownie-config.yaml

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+project_structure:
+    build: build
+    contracts: contracts
+    interfaces: interfaces
+    reports: reports
+    scripts: scripts
+    tests: tests
+
+networks:
+    default: goerli-alchemy 
+    development:
+        gas_limit: max
+        gas_buffer: 1
+        gas_price: 0
+        max_fee: null
+        priority_fee: null
+        reverting_tx_gas_limit: max
+        default_contract_owner: true
+        cmd_settings: null
+    live:
+        gas_limit: auto
+        gas_buffer: 1.1
+        gas_price: auto
+        max_fee: null
+        priority_fee: null
+        reverting_tx_gas_limit: false
+        default_contract_owner: false
+
+compiler:
+    evm_version: null
+    solc:
+        version: null
+        optimizer:
+            enabled: true
+            runs: 200
+        remappings: null
+    vyper:
+        version: null
+
+console:
+    show_colors: true
+    color_style: monokai
+    auto_suggest: true
+    completions: true
+    editing_mode: emacs
+
+reports:
+    exclude_paths: null
+    exclude_contracts: null
+    only_include_project: true
+
+hypothesis:
+    deadline: null
+    max_examples: 50
+    report_multiple_bugs: False
+    stateful_step_count: 10
+    phases:
+        explicit: true
+        reuse: true
+        generate: true
+        target: true
+        shrink: true
+
+autofetch_sources: false
+dependencies: null
+dev_deployment_artifacts: false
+
+
+

web3/vote-dapp/Vote.sol

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+// SPDX-License-Identifier: GPL-3.0
+
+pragma solidity =0.8.7;
+
+contract Vote {
+
+    event Voted(address indexed voter, uint8 proposal);
+
+    mapping(address => bool) public voted;
+
+    uint256 public endTime;
+
+    uint256 public proposalA;
+    uint256 public proposalB;
+    uint256 public proposalC;
+
+    constructor(uint256 _endTime) {
+        endTime = _endTime;
+    }
+
+    function vote(uint8 _proposal) public {
+        require(block.timestamp < endTime, "Vote expired.");
+        require(_proposal >= 1 && _proposal <= 3, "Invalid proposal.");
+        require(!voted[msg.sender], "Cannot vote again.");
+        voted[msg.sender] = true;
+        if (_proposal == 1) {
+            proposalA ++;
+        }
+        else if (_proposal == 2) {
+            proposalB ++;
+        }
+        else if (_proposal == 3) {
+            proposalC ++;
+        }
+        emit Voted(msg.sender, _proposal);
+    }
+
+    function votes() public view returns (uint256) {
+        return proposalA + proposalB + proposalC;
+    }
+}
+
+

web3/vote-dapp/contracts/Vote.sol

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+// SPDX-License-Identifier: GPL-3.0
+
+pragma solidity =0.8.7;
+
+contract Vote {
+
+    event Voted(address indexed voter, uint8 proposal);
+
+    mapping(address => bool) public voted;
+
+    uint256 public endTime;
+
+    uint256 public proposalA;
+    uint256 public proposalB;
+    uint256 public proposalC;
+
+    constructor(uint256 _endTime) {
+        endTime = _endTime;
+    }
+
+    function vote(uint8 _proposal) public {
+        require(block.timestamp < endTime, "Vote expired.");
+        require(_proposal >= 1 && _proposal <= 3, "Invalid proposal.");
+        require(!voted[msg.sender], "Cannot vote again.");
+        voted[msg.sender] = true;
+        if (_proposal == 1) {
+            proposalA ++;
+        }
+        else if (_proposal == 2) {
+            proposalB ++;
+        }
+        else if (_proposal == 3) {
+            proposalC ++;
+        }
+        emit Voted(msg.sender, _proposal);
+    }
+
+    function votes() public view returns (uint256) {
+        return proposalA + proposalB + proposalC;
+    }
+}
+
+
+