Cache monitor RPC calls to increase performance (#322)

CONFIGURATION.md

@@ -70,3 +70,4 @@ MONITOR_VALIDATOR_FOREIGN_TX_LIMIT | Average gas usage of a transaction sent by
 MONITOR_TX_NUMBER_THRESHOLD | If estimated number of transaction is equal to or below this value, the monitor will report that the validator has less funds than it is required. | integer
 MONITOR_PORT | The port for the Monitor. | integer
 MONITOR_BRIDGE_NAME | The name to be used in the url path for the bridge | string
+MONITOR_CACHE_EVENTS | If set to true, monitor will cache obtained events for other workers runs

deployment/MONITOR.md

@@ -21,6 +21,7 @@ In `group_vars/xdai.yml`
 ---
 MONITOR_BRIDGE_NAME: "xdai"
 MONITOR_PORT: 3003
+MONITOR_CACHE_EVENTS: "true"
 
 COMMON_HOME_RPC_URL: "https://dai.poa.network"
 COMMON_HOME_BRIDGE_ADDRESS: "0x7301CFA0e1756B71869E93d4e4Dca5c7d0eb0AA6"
@@ -64,6 +65,7 @@ In `group_vars/wetc.yml`
 ```
 ---
 MONITOR_BRIDGE_NAME: "wetc"
+MONITOR_CACHE_EVENTS: "true"
 
 COMMON_HOME_RPC_URL: "https://ethereumclassic.network"
 COMMON_HOME_BRIDGE_ADDRESS: "0x073081832B4Ecdce79d4D6753565c85Ba4b3BeA9"

deployment/group_vars/dai.yml

@@ -44,6 +44,7 @@ UI_FOREIGN_GAS_PRICE_UPDATE_INTERVAL: 600000
 ## Monitor
 MONITOR_BRIDGE_NAME: "xdai"
 MONITOR_PORT: 3003
+MONITOR_CACHE_EVENTS: "true"
 MONITOR_HOME_START_BLOCK: 759
 MONITOR_FOREIGN_START_BLOCK: 6478417
 MONITOR_VALIDATOR_HOME_TX_LIMIT: 300000

deployment/group_vars/example.yml

@@ -46,6 +46,7 @@ UI_FOREIGN_GAS_PRICE_UPDATE_INTERVAL: 600000
 ## Monitor
 MONITOR_BRIDGE_NAME: "bridge"
 MONITOR_PORT: 3003
+MONITOR_CACHE_EVENTS: "false"
 MONITOR_HOME_START_BLOCK: 0
 MONITOR_FOREIGN_START_BLOCK: 0
 MONITOR_VALIDATOR_HOME_TX_LIMIT: 300000

deployment/group_vars/ultimate.yml

@@ -43,6 +43,7 @@ UI_FOREIGN_GAS_PRICE_UPDATE_INTERVAL: 600000
 
 #monitor
 MONITOR_BRIDGE_NAME: "bridge"
+MONITOR_CACHE_EVENTS: "true"
 MONITOR_HOME_START_BLOCK: 0
 MONITOR_FOREIGN_START_BLOCK: 0
 MONITOR_VALIDATOR_HOME_TX_LIMIT: 300000

deployment/group_vars/wetc.yml

@@ -45,6 +45,7 @@ UI_FOREIGN_GAS_PRICE_UPDATE_INTERVAL: 600000
 ## Monitor
 MONITOR_BRIDGE_NAME: "wetc"
 MONITOR_PORT: 3003
+MONITOR_CACHE_EVENTS: "true"
 MONITOR_HOME_START_BLOCK: 7703292
 MONITOR_FOREIGN_START_BLOCK: 7412459
 MONITOR_VALIDATOR_HOME_TX_LIMIT: 300000

deployment/roles/monitor/templates/config.env.j2

@@ -32,3 +32,5 @@ MONITOR_FOREIGN_START_BLOCK={{ MONITOR_FOREIGN_START_BLOCK }}
 MONITOR_VALIDATOR_HOME_TX_LIMIT={{ MONITOR_VALIDATOR_HOME_TX_LIMIT }}
 MONITOR_VALIDATOR_FOREIGN_TX_LIMIT={{ MONITOR_VALIDATOR_FOREIGN_TX_LIMIT }}
 MONITOR_TX_NUMBER_THRESHOLD={{ MONITOR_TX_NUMBER_THRESHOLD }}
+
+MONITOR_CACHE_EVENTS={{ MONITOR_CACHE_EVENTS }}

e2e-commons/components-envs/monitor-amb.env

@@ -17,3 +17,4 @@ COMMON_FOREIGN_GAS_PRICE_FACTOR=1
 MONITOR_TX_NUMBER_THRESHOLD=100
 MONITOR_PORT=3013
 MONITOR_BRIDGE_NAME=bridge
+MONITOR_CACHE_EVENTS=false

e2e-commons/components-envs/monitor-erc20-native.env

@@ -17,3 +17,4 @@ COMMON_FOREIGN_GAS_PRICE_FACTOR=1
 MONITOR_TX_NUMBER_THRESHOLD=100
 MONITOR_PORT=3012
 MONITOR_BRIDGE_NAME=bridge
+MONITOR_CACHE_EVENTS=false

e2e-commons/components-envs/monitor-erc20.env

@@ -17,3 +17,4 @@ COMMON_FOREIGN_GAS_PRICE_FACTOR=1
 MONITOR_TX_NUMBER_THRESHOLD=100
 MONITOR_PORT=3011
 MONITOR_BRIDGE_NAME=bridge
+MONITOR_CACHE_EVENTS=false

e2e-commons/components-envs/monitor.env

@@ -17,3 +17,4 @@ COMMON_FOREIGN_GAS_PRICE_FACTOR=1
 MONITOR_TX_NUMBER_THRESHOLD=100
 MONITOR_PORT=3010
 MONITOR_BRIDGE_NAME=bridge
+MONITOR_CACHE_EVENTS=false

monitor/.env.example

@@ -21,3 +21,4 @@ COMMON_FOREIGN_GAS_PRICE_FACTOR=1
 
 MONITOR_TX_NUMBER_THRESHOLD=100
 MONITOR_PORT=3003
+MONITOR_CACHE_EVENTS=true

monitor/utils/events.js

@@ -16,12 +16,14 @@ const {
 } = require('../../commons')
 const { normalizeEventInformation } = require('./message')
 const { filterTransferBeforeES } = require('./tokenUtils')
+const { writeFile, readCacheFile } = require('./file')
 
 const {
   COMMON_HOME_RPC_URL,
   COMMON_FOREIGN_RPC_URL,
   COMMON_HOME_BRIDGE_ADDRESS,
-  COMMON_FOREIGN_BRIDGE_ADDRESS
+  COMMON_FOREIGN_BRIDGE_ADDRESS,
+  MONITOR_CACHE_EVENTS
 } = process.env
 const MONITOR_HOME_START_BLOCK = toBN(Number(process.env.MONITOR_HOME_START_BLOCK) || 0)
 const MONITOR_FOREIGN_START_BLOCK = toBN(Number(process.env.MONITOR_FOREIGN_START_BLOCK) || 0)
@@ -34,7 +36,17 @@ const web3Foreign = new Web3(foreignProvider)
 
 const { getBlockNumber } = require('./contract')
 
+const cacheFilePath = '/tmp/cachedEvents.json'
 async function main(mode) {
+  if (MONITOR_CACHE_EVENTS === 'true') {
+    logger.debug('checking existing events cache')
+    const cachedEvents = readCacheFile(cacheFilePath)
+    if (cachedEvents !== false) {
+      logger.debug('returning events stored in cache')
+      return cachedEvents
+    }
+  }
+
   const homeErcBridge = new web3Home.eth.Contract(HOME_ERC_TO_ERC_ABI, COMMON_HOME_BRIDGE_ADDRESS)
   const bridgeMode = mode || (await getBridgeMode(homeErcBridge))
   const { HOME_ABI, FOREIGN_ABI } = getBridgeABIs(bridgeMode)
@@ -170,7 +182,7 @@ async function main(mode) {
   }
 
   logger.debug('Done')
-  return {
+  const result = {
     homeToForeignRequests,
     homeToForeignConfirmations,
     foreignToHomeConfirmations,
@@ -178,6 +190,12 @@ async function main(mode) {
     isExternalErc20,
     bridgeMode
   }
+
+  if (MONITOR_CACHE_EVENTS === 'true') {
+    logger.debug('saving obtained events into cache file')
+    writeFile(cacheFilePath, result, false)
+  }
+  return result
 }
 
 module.exports = main

monitor/utils/file.js

@@ -15,8 +15,9 @@ async function readFile(filePath) {
   }
 }
 
-function writeFile(filePath, object) {
-  fs.writeFileSync(path.join(process.cwd(), filePath), JSON.stringify(object, null, 4))
+function writeFile(filePath, object, useCwd = true) {
+  const fullPath = useCwd ? path.join(process.cwd(), filePath) : filePath
+  fs.writeFileSync(fullPath, JSON.stringify(object, null, 4))
 }
 
 function createDir(dirPath) {
@@ -29,8 +30,17 @@ function createDir(dirPath) {
   }
 }
 
+function readCacheFile(filePath) {
+  try {
+    return JSON.parse(fs.readFileSync(filePath))
+  } catch (_) {
+    return false
+  }
+}
+
 module.exports = {
   readFile,
   writeFile,
-  createDir
+  createDir,
+  readCacheFile
 }