Add oracle helper script for fetching interest amounts via async calls (

#615)

oracle/docker-compose-helpers.yml

@@ -0,0 +1,15 @@
+---
+version: '2.4'
+services:
+  interestFetcher:
+    cpus: 0.1
+    mem_limit: 500m
+    image: poanetwork/tokenbridge-oracle:latest
+    env_file: ./.env
+    environment:
+      NODE_ENV: production
+      INTEREST_FETCHER_PRIVATE_KEY: ${INTEREST_FETCHER_PRIVATE_KEY}
+      INTEREST_FETCH_CONTRACT_ADDRESS: '0xCd152c7Bd4189Ddee97EaBb783FC5cD93CF2D230'
+      INTERVAL: 300000
+    restart: unless-stopped
+    entrypoint: yarn helper:interestFether

oracle/package.json

@@ -18,6 +18,7 @@
     "confirm:collected-signatures": "./scripts/start-worker.sh confirmRelay collected-signatures-watcher",
     "confirm:information-request": "./scripts/start-worker.sh confirmRelay information-request-watcher",
     "manager:shutdown": "./scripts/start-worker.sh shutdownManager shutdown-manager",
+    "helper:interestFether": "node ./scripts/interestFetcher.js",
     "dev": "concurrently -n 'watcher:signature-request,watcher:collected-signatures,watcher:affirmation-request,watcher:transfer, sender:home,sender:foreign' -c 'red,green,yellow,blue,magenta,cyan' 'yarn watcher:signature-request' 'yarn watcher:collected-signatures' 'yarn watcher:affirmation-request' 'yarn watcher:transfer' 'yarn sender:home' 'yarn sender:foreign'",
     "test": "NODE_ENV=test mocha",
     "test:watch": "NODE_ENV=test mocha --watch --reporter=min",

oracle/scripts/interestFetcher.js

@@ -0,0 +1,65 @@
+require('../env')
+const { isAddress } = require('web3').utils
+const { privateKeyToAddress, setIntervalAndRun } = require('../src/utils/utils')
+const { EXIT_CODES } = require('../src/utils/constants')
+const { web3Home } = require('../src/services/web3')
+const { sendTx } = require('../src/tx/sendTx')
+
+const privateKey = process.env.INTEREST_FETCHER_PRIVATE_KEY
+const interval = process.env.INTERVAL ? parseInt(process.env.INTERVAL, 10) : 3600 * 1000
+const contractAddress = process.env.INTEREST_FETCH_CONTRACT_ADDRESS
+
+if (!privateKey) {
+  console.error('Environment variable INTEREST_FETCHER_PRIVATE_KEY is not set')
+  process.exit(EXIT_CODES.GENERAL_ERROR)
+}
+
+if (interval < 300 * 1000) {
+  console.error('Interval is to small, should be at least 5 minutes')
+  process.exit(EXIT_CODES.GENERAL_ERROR)
+}
+
+if (!isAddress(contractAddress)) {
+  console.error('Invalid contract address provided', contractAddress)
+  process.exit(EXIT_CODES.GENERAL_ERROR)
+}
+
+const gasPrice = process.env.COMMON_HOME_GAS_PRICE_FALLBACK || '1000000000'
+
+async function main() {
+  // assuming that we are using this contract - https://github.com/omni/interest-fetcher-contract
+  const contract = new web3Home.eth.Contract([{ name: 'fetchInterest', type: 'function', inputs: [] }], contractAddress)
+  const chainId = await web3Home.eth.getChainId()
+  const data = contract.methods.fetchInterest().encodeABI()
+  const senderAddress = privateKeyToAddress(privateKey)
+  console.log(
+    `Initialized, chainId=${chainId}, data=${data}, contract=${contractAddress}, interval=${interval / 1000}s`
+  )
+
+  await setIntervalAndRun(async () => {
+    let gasLimit
+    try {
+      gasLimit = await contract.methods.fetchInterest().estimateGas()
+    } catch (e) {
+      console.log('Gas limit estimation failed, will retry later', new Date())
+      return
+    }
+
+    const nonce = await web3Home.eth.getTransactionCount(senderAddress)
+
+    const txHash = await sendTx({
+      privateKey,
+      to: contractAddress,
+      data,
+      nonce,
+      gasPrice,
+      gasLimit: Math.round(gasLimit * 1.5),
+      amount: '0',
+      chainId,
+      web3: web3Home
+    })
+    console.log('Sent transaction with fetch interest', txHash, new Date())
+  }, interval)
+}
+
+main()