Use safe approach for eth_getLogs requests (#581)

oracle/src/confirmRelay.js

@@ -35,7 +35,7 @@ async function initialize() {
   try {
     const checkHttps = checkHTTPS(ORACLE_ALLOW_HTTP_FOR_RPC, logger)
 
-    web3.currentProvider.urls.forEach(checkHttps(config.chain))
+    web3.currentProvider.subProvider.urls.forEach(checkHttps(config.chain))
 
     attached = await isAttached()
     if (attached) {

oracle/src/sender.js

@@ -40,7 +40,7 @@ async function initialize() {
   try {
     const checkHttps = checkHTTPS(process.env.ORACLE_ALLOW_HTTP_FOR_RPC, logger)
 
-    web3.currentProvider.urls.forEach(checkHttps(config.chain))
+    web3.currentProvider.subProvider.urls.forEach(checkHttps(config.chain))
 
     GasPrice.start(config.id)
 

oracle/src/services/HttpListProvider.js

@@ -2,6 +2,8 @@ const fetch = require('node-fetch')
 const promiseRetry = require('promise-retry')
 const { FALLBACK_RPC_URL_SWITCH_TIMEOUT } = require('../utils/constants')
 
+const { onInjected } = require('./injectedLogger')
+
 // From EIP-1474 and Infura documentation
 const JSONRPC_ERROR_CODES = [-32603, -32002, -32005]
 
@@ -33,14 +35,10 @@ function HttpListProvider(urls, options = {}) {
   this.options = { ...defaultOptions, ...options }
   this.currentIndex = 0
   this.lastTimeUsedPrimary = 0
-  this.logger = {
-    debug: () => {},
-    info: () => {}
-  }
-}
 
-HttpListProvider.prototype.setLogger = function(logger) {
+  onInjected(logger => {
     this.logger = logger.child({ module: `HttpListProvider:${this.options.name}` })
+  })
 }
 
 HttpListProvider.prototype.send = async function send(payload, callback) {

oracle/src/services/RedundantHttpListProvider.js

@@ -1,6 +1,7 @@
 const promiseRetry = require('promise-retry')
 const { promiseAny } = require('../utils/utils')
 const { defaultOptions, HttpListProviderError, send } = require('./HttpListProvider')
+const { onInjected } = require('./injectedLogger')
 
 function RedundantHttpListProvider(urls, options = {}) {
   if (!(this instanceof RedundantHttpListProvider)) {
@@ -13,10 +14,9 @@ function RedundantHttpListProvider(urls, options = {}) {
 
   this.urls = urls
   this.options = { ...defaultOptions, ...options }
-}
-
-RedundantHttpListProvider.prototype.setLogger = function(logger) {
+  onInjected(logger => {
     this.logger = logger.child({ module: `RedundantHttpListProvider:${this.options.name}` })
+  })
 }
 
 RedundantHttpListProvider.prototype.send = async function send(payload, callback) {

oracle/src/services/SafeEthLogsProvider.js

@@ -0,0 +1,41 @@
+const { hexToNumber, isHexStrict } = require('web3').utils
+
+const { onInjected } = require('./injectedLogger')
+
+function SafeEthLogsProvider(provider) {
+  this.subProvider = provider
+  onInjected(logger => {
+    this.logger = logger.child({ module: 'SafeEthLogsProvider' })
+  })
+}
+
+SafeEthLogsProvider.prototype.send = function send(payload, callback) {
+  if (payload.method === 'eth_getLogs' && isHexStrict(payload.params[0].toBlock)) {
+    this.logger.debug('Modifying eth_getLogs request to include batch eth_blockNumber request')
+
+    const newPayload = [payload, { jsonrpc: '2.0', id: payload.id + 1, method: 'eth_blockNumber', params: [] }]
+    this.subProvider.send(newPayload, (err, res) => {
+      if (err) {
+        callback(err, null)
+      } else {
+        const rawLogs = res.find(({ id }) => id === payload.id)
+        const rawBlockNumber = res.find(({ id }) => id === payload.id + 1)
+        const blockNumber = hexToNumber(rawBlockNumber.result)
+        const toBlock = hexToNumber(payload.params[0].toBlock)
+
+        if (blockNumber < toBlock) {
+          this.logger.warn({ toBlock, blockNumber }, 'Returned block number is less than the specified toBlock')
+          callback(new Error('block number too low'), null)
+        } else {
+          callback(null, rawLogs)
+        }
+      }
+    })
+  } else {
+    this.subProvider.send(payload, callback)
+  }
+}
+
+module.exports = {
+  SafeEthLogsProvider
+}

oracle/src/services/injectedLogger.js

@@ -0,0 +1,27 @@
+// workaround to avoid circular dependencies in module imports
+// e.g. logger -> config -> web3 -> provider -> logger
+// transforms to the following import chain
+// logger -> config -> web3 -> provider -> injectedLogger
+// logger -> injectedLogger
+
+let logger
+
+const callbacks = []
+
+function onInjected(cb) {
+  if (logger) {
+    cb(logger)
+  } else {
+    callbacks.push(cb)
+  }
+}
+
+function setLogger(newLogger) {
+  logger = newLogger
+  callbacks.forEach(cb => cb(logger))
+}
+
+module.exports = {
+  onInjected,
+  setLogger
+}

oracle/src/services/logger.js

@@ -1,15 +1,7 @@
 const pino = require('pino')
 const path = require('path')
-const {
-  web3Home,
-  web3Foreign,
-  web3ForeignArchive,
-  web3Side,
-  web3HomeFallback,
-  web3ForeignFallback,
-  web3HomeRedundant,
-  web3ForeignRedundant
-} = require('./web3')
+
+const { setLogger } = require('./injectedLogger')
 
 const config = process.env.NODE_ENV !== 'test' ? require(path.join('../../config/', process.argv[2])) : {}
 
@@ -25,19 +17,6 @@ const logger = pino({
       : {}
 })
 
-web3Home.currentProvider.setLogger(logger)
-web3Foreign.currentProvider.setLogger(logger)
-web3HomeFallback.currentProvider.setLogger(logger)
-web3ForeignFallback.currentProvider.setLogger(logger)
-web3HomeRedundant.currentProvider.setLogger(logger)
-web3ForeignRedundant.currentProvider.setLogger(logger)
-
-if (web3ForeignArchive) {
-  web3ForeignArchive.currentProvider.setLogger(logger)
-}
-
-if (web3Side) {
-  web3Side.currentProvider.setLogger(logger)
-}
+setLogger(logger)
 
 module.exports = logger

oracle/src/services/web3.js

@@ -1,5 +1,6 @@
 const Web3 = require('web3')
 const { HttpListProvider } = require('./HttpListProvider')
+const { SafeEthLogsProvider } = require('./SafeEthLogsProvider')
 const { RedundantHttpListProvider } = require('./RedundantHttpListProvider')
 const { RETRY_CONFIG } = require('../utils/constants')
 
@@ -37,10 +38,10 @@ const foreignOptions = {
   retry: RETRY_CONFIG
 }
 
-const homeProvider = new HttpListProvider(homeUrls, homeOptions)
+const homeProvider = new SafeEthLogsProvider(new HttpListProvider(homeUrls, homeOptions))
 const web3Home = new Web3(homeProvider)
 
-const foreignProvider = new HttpListProvider(foreignUrls, foreignOptions)
+const foreignProvider = new SafeEthLogsProvider(new HttpListProvider(foreignUrls, foreignOptions))
 const web3Foreign = new Web3(foreignProvider)
 
 let web3ForeignArchive = null

oracle/src/watcher.js

@@ -34,7 +34,7 @@ async function initialize() {
   try {
     const checkHttps = checkHTTPS(process.env.ORACLE_ALLOW_HTTP_FOR_RPC, logger)
 
-    web3.currentProvider.urls.forEach(checkHttps(chain))
+    web3.currentProvider.subProvider.urls.forEach(checkHttps(chain))
 
     await getLastProcessedBlock()
     connectWatcherToQueue({