Merge pull request #175 from saiakhil2012/akhil/add-vmbc-ethers-samples

Add VMBC Ethers related Sample Smart Contracts and DApps

Author: saiakhil2012

vmbc-ethers-samples/README.md

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+## VMBC Ethers Sample DApps
+
+### Table of Contents
+1. [Overview](#overview)
+2. [Prerequisites](#prerequisites)
+3. [Deploying Contract using Hardhat](#deploying-contract-using-hardhat)
+4. [Sample 1 - Get Greeting](#sample-1---get-greeting)
+5. [Sample 2 - Set Greeting](#sample-2---set-greeting)
+6. [Sample 3 - Data Copy](#sample-3---data-copy)
+7. [Sample 4 - Batching](#sample-4---batching)
+
+### Overview
+Samples for using VMBC Ethers
+
+### Prerequisites
+* Deploy VMware Blockchain
+* Install npm packages
+```sh
+# For hardhat related config
+npm install
+cd sample-dapps
+# For sample dapps
+npm install
+```
+
+### Deploying Contract using Hardhat
+Following command uses `vmbc` network from inside the file `hardhat.config.js`
+```sh
+npx hardhat run --network vmbc scripts/deploy.js
+```
+Note: Make a note of Contract Address of Greetings Smart Contract from the output of above command
+
+---
+
+### Sample 1 - Get Greeting
+#### Overview
+* This sample depicts way to use view functions of deployed smart contracts
+#### Setup
+* Update the `CONTRACT_ADDRESS` to the contract address received from Deploying usin Hardhat step
+#### Executing
+```sh
+node 1_get_greetings.js
+```
+
+---
+
+### Sample 2 - Set Greeting
+#### Overview
+* This sample depicts way to call any write based functions of deployed smart contracts
+#### Setup
+* Update the `CONTRACT_ADDRESS` to the contract address received from Deploying usin Hardhat step
+* Update the `PRIVATE_KEY_ACC` to the private key of an account
+#### Executing
+```sh
+node 2_set_greetings.js
+```
+
+---
+
+### Sample 3 - Data Copy
+#### Overview
+* This sample depicts following aspects,
+  * Compiling a Smart Contracts in JavaScript using `solc`
+  * Deploying the Smart Contract
+  * Interacting with programatically deployed Smart Contracts
+#### Setup
+* Update the `PRIVATE_KEY_ACC` to the private key of an account
+#### Executing
+```sh
+node 3_data_copy.js
+```
+
+---
+
+### Sample 4 - Batching
+#### Overview
+* This sample depicts following aspects,
+  * Batching of multiple read based calls
+  * Batching of multiple write based transactions
+#### Setup
+* Update `ACCOUNT_1`, `ACCOUNT_2`, `ACCOUNT_3` and `ACCOUNT_4` to the account addresses for 4 accounts 
+* Update the corresponding `PRIVATE_KEY_ACC_1` and `PRIVATE_KEY_ACC_3` to the private key of those two accounts
+#### Executing
+```sh
+node 4_batching.js
+```
+
+---

vmbc-ethers-samples/contracts/DataCopy.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity >=0.4.22 <0.9.0;
+contract DataCopy{
+
+    bytes public memoryStored;
+
+    function callDatacopy(bytes memory data) public returns (bytes memory) {
+        memoryStored = data;
+        return memoryStored;
+    }
+
+    function getMemoryStored() public view returns (bytes memory) {
+        return memoryStored;
+    }
+}

vmbc-ethers-samples/contracts/Greetings.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity >=0.4.22 <0.9.0;
+
+contract Greetings {
+    string greeting = "Default-Greeting-From-Solidity";
+    uint16 count = 0;
+
+    function setGreeting(string memory _newGreeting) public {
+        emit NewGreetingEvent(msg.sender, greeting, _newGreeting);
+        greeting = _newGreeting;
+        ++count; 
+    }
+
+    // update text
+    function getGreeting() public view returns (string memory) {
+        return greeting;
+    }
+
+    event NewGreetingEvent(address _sender, string _oldGreeting, string _newGreeting);
+}

vmbc-ethers-samples/contracts/Migrations.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity >=0.4.22 <0.9.0;
+
+contract Migrations {
+  address public owner = msg.sender;
+  uint public last_completed_migration;
+
+  modifier restricted() {
+    require(
+      msg.sender == owner,
+      "This function is restricted to the contract's owner"
+    );
+    _;
+  }
+
+  function setCompleted(uint completed) public restricted {
+    last_completed_migration = completed;
+  }
+}

vmbc-ethers-samples/hardhat.config.js

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+require("@nomiclabs/hardhat-waffle");
+module.exports = {
+  defaultNetwork: "vmbc",
+  networks: {
+    vmbc: {
+      url: "http://127.0.0.1:8545"
+    }
+  },
+  solidity: {
+    version: "0.8.9",
+    settings: {
+      optimizer: {
+        enabled: true,
+        runs: 200
+      }
+    }
+  },
+  paths: {
+    sources: "./contracts",
+  },
+  mocha: {
+    timeout: 40000
+  }
+}