Initial commit

Author: yosriady

.gitignore

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+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+### OSX ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Serverless ###
+# Ignore build directory
+.serverless

.nvmrc

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+12.13.0

README.md

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+# serverless-ethers
+
+## Table of Contents
+
+|                                     | Description                                 | Stack                 |
+| ----------------------------------- | ------------------------------------------- | --------------------- |
+| [`contracts`](contracts)     | 🖼 Smart contract ABIs | `json`, `ethereum` |
+| [`functions`](functions)                  | 🚀 Lambda functions                              | `node`, `js`          |
+
+## Prerequisites
+
+Install the [Serverless Framework CLI](https://www.serverless.com/framework/docs/getting-started/).
+
+## Getting Started
+
+```bash
+git clone [email protected]:yosriady/serverless-ethers.git
+cd serverless-ethers
+nvm use
+npm install
+```
+
+### Set your environment variables
+
+You can find and update the function's configuration in [`serverless.yml`](https://github.com/yosriady/serverless-ethers/blob/master/serverless.yml):
+
+```yml
+service: serverless-ethers
+provider:
+  name: aws
+  runtime: nodejs12.x
+  region: ap-southeast-1
+  timeout: 30
+  environment:
+    DEFAULT_GAS_PRICE: 60000000000
+    MNEMONIC: ...
+```
+
+This example uses the following environment variables:
+
+- `DEFAULT_GAS_PRICE`: Default gas price used when making write transactions.
+- `MNEMONIC`: 12-word mnemonic used to derive an Ethereum address, make sure it's funded with Ether if you intend to write data to Ethereum!
+- `SLACK_HOOK_URL`: The example sends messages to Slack using [Incoming Webhooks](https://api.slack.com/messaging/webhooks). You can get this URL from your Slack dashboard. (Optional)
+
+> You can change your deployed function's environment variables on the fly from the AWS Lambda console.
+
+### Triggering the function locally
+
+```bash
+serverless invoke local --function exec
+```
+
+This will execute the smart contract function from your local machine.
+Great for debugging and testing.
+
+### Deploying to AWS
+
+```bash
+serverless deploy
+```
+
+## Thanks
+
+**serverless-ethers** 💌 2020+, Yos Riady. Released under the [MIT] License.<br>
+Authored and maintained by Yos Riady with help from contributors ([list][contributors]).
+
+> [yos.io](http://yos.io) &nbsp;&middot;&nbsp;
+> GitHub [@yosriady](https://github.com/yosriady)
+
+[MIT]: http://mit-license.org/
+[contributors]: http://github.com/yosriady/serverless-ethers/contributors

contracts/abis.js

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+const DummyStorage = require("./abis/DummyStorage.json");
+
+const abis = {
+  DummyStorage,
+};
+
+module.exports = abis;

contracts/abis/DummyStorage.json

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+[{
+	"anonymous": false,
+	"inputs": [{
+		"indexed": true,
+		"internalType": "address",
+		"name": "source",
+		"type": "address"
+	}, {
+		"indexed": false,
+		"internalType": "uint256",
+		"name": "value",
+		"type": "uint256"
+	}],
+	"name": "Write",
+	"type": "event"
+}, {
+	"inputs": [],
+	"name": "get",
+	"outputs": [{
+		"internalType": "uint256",
+		"name": "",
+		"type": "uint256"
+	}],
+	"stateMutability": "view",
+	"type": "function"
+}, {
+	"inputs": [{
+		"internalType": "uint256",
+		"name": "value",
+		"type": "uint256"
+	}],
+	"name": "put",
+	"outputs": [],
+	"stateMutability": "nonpayable",
+	"type": "function"
+}]

contracts/addresses.js

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+const addresses = {
+  DummyStorage: "0xfb01bf6abde080a278a7bbc62f3ba568380eafed",
+};
+
+module.exports = addresses;

contracts/index.js

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+const abis = require("./abis");
+const addresses = require("./addresses");
+
+module.exports = {
+  abis,
+  addresses,
+}

functions/exec.js

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+const axios = require('axios');
+const ethers = require('ethers');
+const { abis, addresses } = require('../contracts');
+
+exports.handler = async function() {
+  console.log('Starting...');
+  // Load Contract ABIs
+  const DummyStorageABI = abis.DummyStorage;
+  const DummyStorageAddress = addresses.DummyStorage;
+  console.log('Contract ABIs loaded');
+
+  // Initialize Ethers wallet
+  const provider = new ethers.getDefaultProvider(parseInt(process.env.CHAIN_ID))
+  let wallet = ethers.Wallet.fromMnemonic(process.env.MNEMONIC)
+  wallet = wallet.connect(provider)
+  console.log('Ethers wallet loaded');
+
+  // Load contract
+  const contract = new ethers.Contract(
+    DummyStorageAddress,
+    DummyStorageABI,
+    wallet,
+  )
+  console.log('Contract loaded');
+
+  console.log('Sending transaction...');
+  try {
+    // Specify custom tx overrides, such as gas price https://docs.ethers.io/ethers.js/v5-beta/api-contract.html#overrides
+    const overrides = { gasPrice: process.env.DEFAULT_GAS_PRICE };
+
+    // Call smart contract function `put(uint)`
+    const RANDOM_INTEGER = Math.floor(Math.random() * 100); // returns a random integer from 0 to 99
+    const tx = await contract.put(RANDOM_INTEGER, overrides)
+
+    const successMessage = `:white_check_mark: Transaction sent https://ropsten.etherscan.io/tx/${tx.hash}`;
+    console.log(successMessage)
+    await postToSlack(successMessage);
+  } catch (err) {
+    const errorMessage = `:warning: Transaction failed: ${err.message}`;
+    console.error(errorMessage)
+    await postToSlack(errorMessage);
+    return err;
+  }
+
+  console.log('Completed');
+  return true;
+}
+
+function postToSlack(text) {
+  const payload = JSON.stringify({ 
+    text,
+  });
+  return axios.post(process.env.SLACK_HOOK_URL, payload)
+}